341 results on '"Liu, Baochang"'
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52. Polycrystalline diamond compact with enhanced thermal stability
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Liu, Shiqi, Han, Lei, Zou, Yongtao, Zhu, Pinwen, and Liu, Baochang
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- 2017
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53. A Real-Time Sinkage Detection Method for the Planetary Robotic Wheel-on-Limb System via a Monocular Camera.
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Liu, Baochang, Feng, Lihang, and Wang, Dong
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MONOCULARS ,PLANETARY systems ,ROBOTICS ,MONOCULAR vision ,PLANETARY gearing - Abstract
When traversing soft and rugged terrain, a planetary rover is susceptible to slipping and sinking, which impedes its movement. The real-time detection of wheel sinkage in the planetary wheel-on-limb system is crucial for enhancing motion safety and passability on such terrain. Initially, this study establishes a measurement of wheel sinkage under complex terrain conditions. Subsequently, a monocular vision-based wheel sinkage detection method is presented by combining the wheel–terrain boundary with the wheel center position (WTB-WCP). The method enables the efficient and accurate detection of wheel sinkage through two-stage parallel computation of the wheel–terrain boundary fitting and wheel center localization. Finally, this study establishes an experimental platform based on a monocular camera and the planetary rover wheel-on-limb system to experimentally validate and comparatively analyze the proposed method. The experimental results demonstrate that the method effectively provides information on the wheel sinkage of the planetary rover wheel-on-limb system, and the relative errors of the method do not exceed 4%. The method has high accuracy and reliability and is greatly significant for the safety and passability of planetary rovers in soft and rugged terrain. [ABSTRACT FROM AUTHOR]
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- 2024
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54. РАЗРАБОТКА АЛМАЗНОГО БУРОВОГО ДОЛОТА ДЛЯ НАПРАВЛЕННОГО БУРЕНИЯ
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Neskoromnykh, Vyacheslav Vasilyevich, Petenev, Pavel Gennadievich, Lysakov, Dmitry Viktorovich, Popova, Marina Sergeevna, Golovchenko, Anton Evgenievich, and Liu Baochang
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bit ,eccentricity ,Materials Science (miscellaneous) ,буровые долота ,скважины ,artificial well deviation ,Management, Monitoring, Policy and Law ,искусственное искривление ,Geotechnical Engineering and Engineering Geology ,drilling ,отклонители ,направленное бурение ,Fuel Technology ,milling ,diverter ,Economic Geology ,эксцентриситет ,фрезерование ,Waste Management and Disposal - Abstract
Актуальность. Многолетний опыт работ по направленному бурению позволил выявить сложные горно-геологические условия, в которых использование отклонителей приводит к снижению результативности искривления и авариям. Так, например, раскрепление отклонителей непрерывного действия в твердых, очень твердых и абразивных горных породах, когда диаметр скважины имеет минимальную разработанность по диаметру, приводит к заклиниванию породоразрушающего инструмента. В этом случае повысить эффективность работы отклонителей сложно в связи с отсутствием специальных технических средств и эффективных технологий искривления скважин, что делает проблему снижения эффективности работы отклонителей актуальной и требующей решения. Цель: поиск и анализ причин заклинивания отклонителей ассиметричного и комбинированного типов при постановке и раскреплении в скважинах, пробуренных в твердых горных породах, разработка конструкции алмазного бурового долота со специальной схемой расположения бокового и торцевого вооружения и оценка влияния эксцентриситета режущей части бурового инструмента на эффективность проработки ствола скважины по диаметру. Объект: эксцентриситет режущей части бурового инструмента. Методы: сбор, анализ и обобщение данных из литературных источников, аналитическое исследование и экспериментальные опытные работы. Результаты. Описаны причины, вызывающие заклинивание отклонителя в скважине, представлены существующие технологии, позволяющие решить проблему заклинивания долота при раскреплении отклонителя, разработана конструкция алмазного бурового долота со специальной схемой размещения торцевого и бокового вооружения и описан принцип работы, проведена оценка влияния эксцентриситета режущей части на процесс проработки скважины по диаметру, и установлен факт повышения фрезерующей способности долота. The relevance. Many years of experience in directional drilling has made it possible to identify complex mining and geological conditions in which the use of deflectors leads to decrease in the effectiveness of the curvature and accidents. So, for example, the fastening of continuous deflectors in hard, very hard and abrasive rocks, when the borehole diameter has minimum development along the borehole diameter, leads to jamming of the rock cutting tool. In this case, it is difficult to improve the efficiency of diverters due to the lack of special technical means and effective technologies for deviating wells, which makes the problem of reducing the efficiency of diverters relevant and needs to be addressed. The main aim: search for the causes of jamming of asymmetric and combined diverters when setting and breaking out in wells drilled in hard rocks; development of a diamond drill bit design with a special layout of lateral and end cutting structure; assessment of the effect of eccentricity of the cutting part of a drilling tool on the efficiency of drilling a wellbore according to diameter. Object: eccentricity of the cutting part of the drilling tool. Methods: collection, analysis and generalization of the data in literary sources, analytical research and experimental work. Results. The paper describs the causes of the whipstock jamming in the well and introduces the existing technologies that allow solving the given problem. The authors developed a diamond drill bit of special design and described the principle of its operation. The influence of the cutting part eccentricity on drilling the hole in diameter is assessed and the fact of increasing the milling ability is established.
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- 2022
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55. An approximate approach to estimation of dissociation rate of gas hydrate in porous rock bed
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Dreus Andrii, Gubin Oleksandr, Bondarenko Volodymyr, Lysenko Roman, and Liu Baochang
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Environmental sciences ,GE1-350 - Abstract
Development of deep shelf or onshore gas hydrate fields involves drilling wells with subsequent thermal, decompression or chemical action on the bed. In this case, the radius of thermal or decompression action is limited. As the field develops, recovery efficiency decreases, and necessity arises for drilling a new well that influences the cost of the technology. To determine the rational wells location, it is necessary to predict the advance of the phase transformation rate front into the depth of the bed. In this work, to study the movement dynamics of the gas hydrates dissociation front in a porous layer of rock, the Stefan problem solution is used. The method adequacy is substantiated by comparing the calculated results with known experimental data. The temperature fields are modelled in a porous bed during the methane hydrate dissociation. The temperature field dynamics for 200 days in a porous bed during the methane hydrate dissociation caused by thermal action is shown. The influence of porosity and excess temperature on the dissociation front movement rate is revealed.
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- 2021
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56. Design and numerical simulation of a microwave antenna with coaxial slots for preventing secondary formation of gas hydrate
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Wang Shujing, Zhu Yue, Bondarenko Volodymyr, Dreus Andrii, Liang Jinqiang, and Liu Baochang
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Environmental sciences ,GE1-350 - Abstract
Gas hydrate is a new clean energy resource with polar molecule. However due to the change of temperature and pressure during extraction process, there will be secondary formation of gas hydrate, which usually occurs in reservoirs or pipelines near the wellhead. It is significance to prevent secondary formation of hydrate because of safety issues or production rate reduction caused by it. Theoretically, microwave heating can accelerate the decomposition of gas hydrate. Therefore, it is possible to use microwave radiation to prevent secondary formation of hydrate. In this paper, a microwave antenna with special shaped coaxial-slots was designed. Based on electromagnetics and antenna transmission theories, the key parameters of the coaxial-slot antenna were calculated. The frequency is 2.45 GHz, the impedance is 50 ohms, and ratio of outer to inner conductor radius is 3.32. The slots were designed as ‘H’-shape with the width is 2 mm, the radial length is 12mm, the axial length is 14 mm and the interval is 35 mm. Teflon was used as filling material and the radome. Then the software HFSS and ANSYS were used to analyze the electromagnetic field and temperature field to further optimize the parameters. It will be proved that the microwave antenna can heat gas hydrate and prevent the secondary formation.
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- 2021
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57. A Raw Data Simulator for Ocean Wave Radar Spectrometer
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Liu, Baochang, Ji, Ziyang, Li, Xiuzhong, Gu, Jingwei, He, Yijun, and Qiao, Siqi
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This article presents a new simulator able to generate raw data for ocean wave radar spectrometer (OWRS). Data simulation involves three key procedures: generating 2-D sea wave height, velocity, and acceleration fields by use of a prescribed ocean wave height spectrum; calculating the 2-D sea surface normalized radar cross section (NRCS) field using a quasi-specular backscatter model; and incorporating the generated sea wave height, velocity, and acceleration fields into the radar instantaneous range equation (IRE). Our simulator’s reliability in replicating real-world ocean wave spectra has been confirmed by comparing retrieved wave spectra from simulated OWRS raw data with input reference wave spectra and real-measured radar data. The proposed simulator has several advantages over conventional simulators. Notably, OWRS data generated by the proposed simulator are complex in-phase/quadrature-phase (I/Q) raw data, instead of backscattered power modulation data as simulated by conventional simulators. Our simulator’s other advantages include its ability to reflect the effect of Doppler modulation induced by the motions of the radar platform and the sea waves in the speckle noise spectrum after processing OWRS raw data simulated by the proposed simulator, as well as its ability to embody the effect of range modulation caused by the sea surface topography, including both linear and higher order range modulation effects, in retrieved wave slope spectra. Our simulator offers a powerful tool for understanding complicated interactions between ocean wave dynamics and radar signals. Furthermore, it also provides radar engineers with a cost-effective way to evaluate potential designs for future spaceborne OWRS.
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- 2024
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58. Methane Hydrate Dissociation in Quartz Sand by Depressurization Combined with Microwave Stimulation
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Zhu, Yue, primary, Li, Xuhui, additional, Wang, Pengfei, additional, Li, Yun, additional, Li, Shengli, additional, Bondarenko, Volodymyr, additional, Dreus, Andrii, additional, Li, Xiaoyang, additional, Zhu, Jinlong, additional, and Liu, Baochang, additional
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- 2023
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59. Improved Analytical Formula for the SAR Doppler Centroid Estimation Standard Deviation for a Dynamic Sea Surface
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Qiao, Siqi, primary, Liu, Baochang, additional, and He, Yijun, additional
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- 2023
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60. Mechanical Properties and Interface Microstructure of Fe-Ni-Wc-Based Impregnated Diamond Composite Reinforced by Mo2c Layer
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Mao, Xinyue, primary, meng, qingnan, additional, Yuan, Mu, additional, Wang, Sifan, additional, Huang, Shiyin, additional, and Liu, Baochang, additional
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- 2023
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61. A simple and accurate numeric solution procedure for nonlinear buckling model of drill string with frictional effect
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Sun, Youhong, Yu, Yongping, and Liu, Baochang
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- 2015
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62. Closed form solutions for predicting static and dynamic buckling behaviors of a drillstring in a horizontal well
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Sun, Youhong, Yu, Yongping, and Liu, Baochang
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- 2015
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63. АЛГОРИТМ УПРАВЛЕНИЯ СИСТЕМОЙ АЛМАЗНОГО БУРЕНИЯ
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Neskoromnykh, Vyacheslav Vasilievich, Popova, Marina Sergeevna, Zotov, Zakhar Gennadievich, Liu Baochang, and Jilin University
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drilling mode ,algorithm ,Materials Science (miscellaneous) ,механическая скорость ,критерии оптимальности ,оптимизация ,Management, Monitoring, Policy and Law ,управление ,алгоритмы ,Geotechnical Engineering and Engineering Geology ,программное обеспечение ,drilling ,ROP ,бурение ,Fuel Technology ,deepening per revolution ,optimality criterion ,Economic Geology ,control ,optimization ,Waste Management and Disposal ,режимы бурения ,алмазное бурение - Abstract
Актуальность. Из всех известных способов проходки скважин алмазное бурение отличается высокой частотой вращения инструмента на больших глубинах. Такие условия разрушения горной породы требуют особого контроля параметров процесса бурения и их корректировки в случае нарушения баланса системы реализуемых сил. Все параметры процесса бурения в определенной степени взаимосвязаны. Для достижения наибольшей эффективности работы алмазного породоразрушающего инструмента требуется оптимальный механизм его эксплуатации. Анализ ситуации и подбор нужных показателей режима бурения алмазным инструментом довольно трудоемкая работа, которую в производственных условиях необходимо осуществлять непрерывно онлайн, поэтому актуальной является задача разработки автоматизированной системы управления процессом алмазного бурения с целью рациональной организации использования дорогостоящего алмазного инструмента. Автоматизация управления бурением осуществима путем применения современных технологий компьютерного программирования, алгоритм которого должен учитывать все требования оптимизации взаимозависимых параметров процесса бурения. Целью исследования является разработка алгоритма управления системой алмазного бурения для дальнейшего внедрения его в программное обеспечение. Объекты: процесс алмазного бурения скважин, технико-экономические показатели бурения и параметры, оказывающие влияние на результаты бурения. Методы: аналитический метод, метод полного факторного эксперимента, метод моделирования. Результаты. Основными параметрами, влияющими на итоги проводимых буровых работ, являются механическая скорость бурения, ресурс инструмента и мощность, затрачиваемая на разрушение горной породы. Использование в качестве критерия оптимальности величины углубления за оборот позволяет обеспечить приемлемую скорость бурения и низкие затраты мощности при сохранении высокого ресурса инструмента. Процесс управления алмазным бурением заключается в анализе изменения в конкретный момент времени механической скорости бурения и мощности, на основании которого принимается решение о корректировке величины частоты вращения и осевой нагрузки. Разработан алгоритм управления системой алмазного бурения, который может быть реализован доступным языком программирования. The relevance. Diamond drilling is characterized by high rotational speed of the tool at great depths. Such conditions of rock destruction require special control of drilling parameters and their correction. All drilling parameters are interrelated. To achieve the most efficient operation of a diamond rock cutting tool, an optimal mechanism for its operation is required. Analysis of the situation and selection of the required parameters of the drilling mode with diamond tools is the laborious work. This must be done continuously online. The urgent task is the development of the automated control system for diamond drilling in order to rationalize the use of diamond tools. This is possible with the use of modern computer programming technologies. Software algorithm must take into account all the requirements for optimizing the interdependent drilling parameters. The main aim of the research is to develop a control algorithm for a diamond drilling system for its further implementation into software. Objects: diamond drilling, technical and economic indicators of drilling and parameters affecting the results of drilling. Methods: analytical method, full factorial experiment method, modeling method. Results. The main parameters affecting the results of drilling operations are ROP, tool life and power spent on rock destruction. The deepening per revolution as an optimality criterion makes it possible to ensure an acceptable drilling speed and low power consumption while maintaining a high resource of the tool. The control process for diamond drilling consists in analyzing the change at a specific point in time in ROP and power. After the analysis, a decision is made to correct the value of the speed and axial load. A control algorithm for the diamond drilling system was developed. The algorithm can be implemented in an accessible programming language.
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- 2022
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64. Closed form solutions for nonlinear static response of curled cantilever micro-/nanobeams including both the fringing field and van der Waals force effect
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Sun, Youhong, Yu, Yongping, Wu, Baisheng, and Liu, Baochang
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- 2017
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65. Methane gas hydrates influence on sudden coal and gas outbursts during underground mining of coal deposits
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Bondarenko Volodymyr, Svietkina Olena, Lysenko Roman, and Liu Baochang
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Environmental sciences ,GE1-350 - Abstract
The mechanism of gas hydrates formation in coal seams is studied in the paper, as well as their involvement is hypothesized in the sudden outbursts of coal and gas during underground mining of coal deposits. It has been substantiated and proved that one of the real reasons for subsequent outbursts is the formation of gas hydrates in coal as a type of secondary gas hydrate deposits. It has been also substantiated that, as a result of coal metamorphism, a large amount of gaseous hydrocarbons, mainly methane, is formed in the seam, which under certain thermobaric conditions leads to the gas hydrates formation. It has been experimentally proved that the mechanism of such inclusions formation between gas hydrate and coal is a result of strong chemisorption, which, when disturbing thermobaric conditions, leads to gas-dynamic activity of coal seams. It has been revealed that during the dissociation of gas hydrates, obtained in a medium of activated coals, twice as much gaseous methane is released. The research analysis indicates that the formation of natural gas solid solutions in coal pores under certain thermodynamic conditions and the natural humidity, characteristic of coal seams, is one of the causes of sudden coal and gas outbursts. The gas hydrates dissociation influences on the gas-dynamic activity of a coal seam and the formation of an outburst hazardous situation.
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- 2020
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66. An Adaptive Control Framework for Dynamically Reconfigurable Battery Systems Based on Deep Reinforcement Learning
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Yang, Feng, primary, Gao, Fei, additional, Liu, Baochang, additional, and Ci, Song, additional
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- 2022
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67. Characterization of the oil shale products derived via topochemical reaction method
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Sun, Youhong, Bai, Fengtian, Liu, Baochang, Liu, Yumin, Guo, Mingyi, Guo, Wei, Wang, Qiuwen, Lü, Xiaoshu, Yang, Fang, and Yang, Yang
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- 2014
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68. СОПРОТИВЛЕНИЕ ПОРОДЫ ПРИ БУРЕНИИ МЕЛКОРЕЗЦОВЫМ АЛМАЗНЫМ ИНСТРУМЕНТОМ
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Neskoromnykh, Vyacheslav Vasilievich, Popova, Marina Sergeevna, and Liu Baochang
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resistance coefficient ,коэффициент сопротивления ,diamond cutter ,Drag coefficient ,алмазные инструменты ,Materials Science (miscellaneous) ,Management, Monitoring, Policy and Law ,drilling ,силы резания ,Geotechnical engineering ,Penetration depth ,Waste Management and Disposal ,Groove (music) ,Mathematical model ,drilling modes ,Drilling ,сопротивление ,tangential force ,Geotechnical Engineering and Engineering Geology ,алмазные резцы ,факторные эксперименты ,бурение ,Fuel Technology ,cutting force ,Moment (physics) ,Fracture (geology) ,deepening ,Economic Geology ,режимы бурения ,full factorial experiment ,Geology ,Intensity (heat transfer) - Abstract
Актуальность. На результаты бурения влияет то, на сколько эффективно работает породоразрушающий инструмент на забое. Показатели механической скорости бурения, качества сооружения скважины и отбора проб тесно связаны с соответствием выбранного бурового инструмента и технологии его применения физико-механическим свойствам горных пород, слагающих вскрываемый геологический разрез. При неизменной технологии рост сопротивления со стороны забоя влечёт изменение интенсивности углубления скважины. Сведения о коэффициенте сопротивления позволяют правильно управлять процессом и своевременно регулировать характер воздействия бурового инструмента на разрушаемую зону. Цель. Для контроля силового контакта резцов бурового инструмента с забоем скважины необходимо иметь методический аппарат, позволяющий определять механизм разрушения породы с учетом сил сопротивления. Целью работы является развитие методики изучения механизма разрушения породы алмазным резцом. Объект: процесс разрушения горной породы мелким алмазным резцом. Методы: метод полного факторного эксперимента, метод научного познания, аналитические исследования, анализ. В статье приведена методика исследования сопротивления горной породы разрушению алмазным резцом, основанная на применении метода полного факторного эксперимента с получением математических моделей факторов и их графической интерпретации, в частности зависимости углубления за один оборот от режимов бурения, на основании которых определяется коэффициент сопротивления в конкретный момент времени. Результаты. Путем математической обработки ранее полученных экспериментальных данных установлена взаимосвязь коэффициента сопротивления с такими показателями, как механическая скорость бурения, величина углубления за оборот, частота вращения инструмента. Представлен аналитическое исследование возможности регулирования режимов бурения с целью достижения наибольшего эффекта разрушения горной породы путем оценки коэффициента сопротивления как функции интенсивности разрушения или углубления за один оборот. Выведена и доказана правомерность выражения зависимости коэффициента сопротивления от глубины внедрения резца в породу, числа резцов рабочего торца бурового инструмента и их размера, глубины формируемой борозды разрушения, коэффициента трения резца о горную породу и динамической составляющей работы бурового инструмента. Relevance. The drilling results are influenced by the effectiveness of the rock cutting tool operation at the bottom of the well. The indicators of the mechanical drilling speed, the quality of well construction and sampling are closely related to the correspondence of the selected rock cutting tool and technology of its application to the physical and mechanical properties of the rocks that make up the geological section being opened. With the technology unchanged, the increase in resistance from the bottom hole leads to a change in the intensity of the well deepening. Information about the resistance coefficient allows you to correctly control the process and timely adjust the nature of the impact of the drilling tool on the bottomhole. The purpose of research is to control the power contact of the drilling tool cutters with the bottom of the well; it is necessary to have a methodological apparatus that allows determining the mechanism of rock destruction taking into account the resistance forces. Objects: rock breaking. Methods: experimental, full factorial experiment method, analytical research, analysis. The article presents a method for studying the resistance of rocks to destruction with a diamond cutter, based on the use of the method of a full factorial experiment with obtaining mathematical models of factors and their graphic interpretation, in particular the dependence of deepening in one revolution on drilling modes on the basis of which the resistance coefficient when drilling at a particular moment is determined. Results. Based on the analytical study of the results obtained, the dependence of the tangential force on the axial force, rock properties, and the friction coefficient was determined. The paper presents the analytical research of the possibility of regulating drilling modes in order to achieve the greatest effect from drilling by assessing the drag coefficient as a function of the intensity of destruction or deepening in one revolution. The authors have derived and proved the validity of expression of the drag coefficient dependence on the cutter penetration depth into the rock, the number of cutters at the end of the drilling tool and their size, the depth of the formed fracture groove, the cutter friction coefficient on the rock and the dynamic component of the drilling tool operation.
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- 2021
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69. An innovative method for creating and using nanoparticles for gas extraction from gas hydrates
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Bondarenko Volodymyr, Svietkina Olena, Prokopenko Kostiantyn, and Liu Baochang
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Environmental sciences ,GE1-350 - Abstract
The growth of prices for traditional energy sources prompts Ukraine to seek new approaches to solving energy problems. Today, the country has intensified its work in this direction, in particular, legislative support is being developed and improved, and the investment climate for alternative energy projects is improving. In many countries of the world, it has long been understood how serious and necessary is the development of alternative energy. At present, in the face of various gas contradictions and unstable oil prices, the need for energy carriers is constantly increasing, which makes it necessary to seek the latest solutions to the energy problem. Many leading countries in the world are engaged in the search for alternative sources of energy, one of which is natural gas hydrates. This relatively new resource offers great opportunities both for economic growth and stability of states, and for the development of scientific institutions in this field. Flagships in the study and development of gas-hydrated deposits are the United States, China, Japan and Canada. Along with them should be noted the achievements of scientists in India, EU countries, Ukraine, Russia and Bulgaria.
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- 2019
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70. Numerical study of microwave impact on gas hydrate plugs in a pipeline
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Dreus, A. Y, primary, Gubin, O. I, additional, Bondarenko, V. I, additional, Liu, Baochang, additional, and Batuta, V. I, additional
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- 2022
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71. Field study on the performance of a thermosyphon and mechanical refrigeration hybrid cooling system in a 5G telecommunication base station
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Meng, Fanxi, primary, Zhang, Quan, additional, Lin, Yaolin, additional, Zou, Sikai, additional, Fu, Jiyao, additional, Liu, Baochang, additional, Wang, Wei, additional, Ma, Xiaowei, additional, and Du, Sheng, additional
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- 2022
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72. Adaptive MIMO radar target parameter estimation with Kronecker-product structured interference covariance matrix
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Zhou, Shenghua, Liu, Hongwei, Liu, Baochang, and Yin, Kuiying
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- 2012
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73. Strengthening and toughening of carbon fiber reinforced AA2024 by interface self-regulation reaction
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Wu, Jinhao, primary, Sun, Youhong, additional, Meng, Qingnan, additional, Zhang, Chi, additional, Liu, Baochang, additional, and Yuan, Mu, additional
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- 2022
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74. Методика управления процессом бурения и экспериментальные исследования сил сопротивления при бурении долотами с резцами PDC
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Vyacheslav V. Neskromnykh, Marina S. Popova, A. E. Golovchenko, P. G. PETENEV, and Liu Baochang
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lcsh:TN1-997 ,резцы pdc ,полный факторный эксперимент ,алмазное бурение ,отработка бурового инструмента ,режимы бурения ,lcsh:Mining engineering. Metallurgy ,управление процессом бурения - Abstract
Рациональная, теоретически обоснованная и эмпирически верифицированная система управления является условием оптимального управления процессом бурения с соблюдением критериев минимизации затрат временных и материальных ресурсов. Новое поколение породоразрушающего инструмента с применением резцов PDC (polycrystalline diamante cutters), крайне эффективных при бурении скважин различного целевого назначения в горных породах средней твердости, диктует необходимость разработки методики и критериев оптимального управления процессом бурения с использованием данного инструмента. В работе представлен аналитический анализ силового взаимодействия породоразрушающих элементов, горной породы, вмещающей забой, и бурового раствора, насыщенного шламом, выделены влияющие факторы, приведены зависимости для определения параметров разрушения горных пород. Эмпирическая верификация теоретических положений проведена на основе анализа данных экспериментального бурения мрамора коронкой с резцами PDC диаметром 76,2 мм, обработанных с применением метода полного факторного эксперимента с получением математических моделей факторов и их графической интерпретации. Рассмотрена методика управления процессом бурения, основанная на оптимальном соотношении частоты вращения инструмента, осевой нагрузки и углубления за один оборот, позволяющая определить по косвенным признакам режим разрушения горной породы на забое скважины и выбрать оптимальные значения параметров режима бурения, которые соответствуют наиболее оптимальным условиям с точки зрения достижения максимальной механической скорости бурения в совокупности с рациональным режимом работы породоразрушающего инструмента. Представлена схема, содержащая возможные варианты режима отработки долота и способы их распознавания по соотношению углубления за один оборот и частоты вращения породоразрушающего инструмента.
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- 2020
75. ГИДРОДИНАМИКА ПРИ БУРЕНИИ ИМПРЕГНИРОВАННЫМ ПОРОДОРАЗРУШАЮЩИМ ИНСТРУМЕНТОМ С ЭКСЦЕНТРИСИТЕТОМ РЕЖУЩЕЙ ЧАСТИ ТОРЦА МАТРИЦЫ
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Neskoromnykh, Vyacheslav Vasilievich, Petenev, Pavel Gennadievich, Popova, Marina Sergeevna, Komarovsky, Igor Andreevich, Golovchenko, Anton Evgenievich, and Liu Baochang
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алмазные инструменты ,Computer science ,Materials Science (miscellaneous) ,Flow (psychology) ,Mechanical engineering ,Overheating (economics) ,гидродинамика ,компьютерное моделирование ,Management, Monitoring, Policy and Law ,торцы ,Curvature ,hydrodynamics during drilling ,Drilling fluid ,матрицы ,Waste Management and Disposal ,circulation system of the drilling tool ,computer modeling ,diamond tools ,drilling tools ,износ ,Drilling ,режущие части ,Geotechnical Engineering and Engineering Geology ,промывочные системы ,cutting parts ,бурение ,горные породы ,Fuel Technology ,буровые инструменты ,Trajectory ,породоразрушающие инструменты ,Economic Geology ,эксцентриситет ,diamond drilling tools ,Exploration diamond drilling ,Diamond tool - Abstract
Актуальность. К проектированию современного породоразрушающего инструмента выдвигаются высокие требования. Востребованным является буровой инструмент, за счет конструкции которого решается большая часть задач бурения: соблюдение запроектированной траектории ствола скважины, высокие скорость проходки и ресурс, эффективное разрушение горной породы, качество отбора керна и так далее. Зачастую, решая путем изменения конструктивных элементов инструмента одну проблему, разработчики не учитывают другую, которая может оказаться не менее значимой. Так, разработка импрегнированной коронки с эксцентриситетом режущей части торца матрицы позволила значительно уменьшить интенсивность естественного искривления, которое особо актуально при бурении в анизотропных горных породах. Однако изменение конструкции коронки повлекло за собой снижение ресурса инструмента. На необходимость комплексного, системного подхода к исследованию механизма работы бурового инструмента авторами указывалось неоднократно. В связи с этим, учитывая преимущество полученной конструкции в области стабилизации направления ствола скважины, актуальным является исследование причин скорого износа таких коронок. Основной причиной износа алмазного инструмента является перегрев и зашламование режущей части, поэтому при конструировании любого алмазного породоразрушающего инструмента необходимо дополнительно исследовать гидродинамические процессы, протекающие при его работе на забое скважины. Цель: определение особенностей течения жидкости в пределах импрегнированного породоразрушающего инструмента, выделение основных причин износа матрицы, связанных с гидродинамикой на забое, а также конструктивные решения намеченных проблем. Объекты: процесс гидродинамики бурения импрегнированным породоразрушающим инструментом. Методы: компьютерное моделирование, аналитические исследования, анализ. Результаты. Изменение конструкции торца матрицы импрегнированной коронки в сторону смещения равномерности размещения секторов приводит к неравномерному распределению очистного агента в рабочей зоне инструмента. Как следствие, наиболее зашламованные сектора хуже омываются жидкостью и быстрее изнашиваются. Для реализации поставленной задачи - эксцентриситета режущей части торца матрицы с высоким ресурсом, предложены варианты конструктивного исполнения торца импрегнированной коронки. Relevance. High requirements are put forward for the design of modern rock-cutting tools. A drilling tool is in demand, due to the design of which most of the drilling tasks: compliance with the projected trajectory of the wellbore, high drilling speed and resource of the drilling tool, effective destruction of rock, quality of core selection, etc. are solved. Often, when solving one problem by changing the structural elements of the tool, developers do not take into account another one, which may be no less significant. Thus, the development of a diamond tool with the eccentricity of the cutting part of the matrix end has significantly reduced the intensity of natural curvature of wells, which is especially important when drilling in anisotropic rocks. However, the change in the design of the diamond tool resulted in a reduction in the tool's life. The authors have repeatedly pointed out the need for a comprehensive approach to the study of the mechanism of the drilling tool operation. In this regard, given the advantage of the resulting design in the field of regulating the well curvature, it is relevant to study the causes of rapid wear of such a drilling tool. The main reason for wear of a diamond tool is overheating and sludge bounding of the cutting part, so when designing any diamond drilling tool, it is necessary to further investigate the hydrodynamic processes occurring during its operation at the bottom of the well. The purpose of research is to determine the characteristics of the drilling mud flow within the diamond tool, to identify the main causes of matrix wear associated with hydrodynamics at the bottom, as well as design solutions to the problems identified. Objects: hydrodynamics of drilling with an impregnated drilling tool. Methods: computer modeling, analytical research, analysis. Result. Changing the design of the end face of the diamond tool matrix in the direction of shifting the uniformity of the placement of sectors leads to an uneven distribution of drilling mud in the area of operation of the tool. As a result, the most sludge bound sectors are less well cleaned with drilling mud and wear out faster. To implement the task - the eccentricity of the cutting part with a high resource, the variants of the design of the end face of the impregnated crown are proposed.
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- 2020
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76. Effects of graphene addition on mechanical properties of polycrystalline diamond compact
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Shanmin Wang, Dejiang Ma, Li Siqi, Zhaoran Chen, Zhu Yiqing, Dai Wenhao, and Liu Baochang
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010302 applied physics ,Materials science ,Graphene ,Process Chemistry and Technology ,Composite number ,Sintering ,Diamond ,02 engineering and technology ,engineering.material ,021001 nanoscience & nanotechnology ,Microstructure ,01 natural sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,law.invention ,Thermal conductivity ,Residual stress ,Electrical resistivity and conductivity ,law ,0103 physical sciences ,Materials Chemistry ,Ceramics and Composites ,engineering ,Composite material ,0210 nano-technology - Abstract
Polycrystalline diamond compact (PDC) cutters are used widely for mining and drilling in soft to medium hard rock formations. During drilling in very hard and strong rock formations, the rapid wear of the polycrystalline diamond layer results in a low service life of drilling bits. To improve the performance of PDC cutters, we adopted a high-temperature, high-pressure (HTHP) sintering method (5.5–6.0 GPa and 1350–1500 °C) in the current research by adding a certain amount of graphene to raw materials, and we successfully prepared a new type of high-performance diamond composite PDC-G (graphene was added to PDC). We investigated the microstructure, residual stress, hardness, wear resistance, thermal conductivity, and electrical conductivity of the as-synthesized PDC-G. Compared with PDC without graphene, the hardness and wear resistance of PDC-G with 0.1 wt% graphene addition were enhanced by 75% and 33%, respectively. Moreover, the electrical conductivity of PDC prepared by graphene strengthening was improved 42-fold. The strengthening mechanism of PDC-G mainly occurred as a result of the lubricating effect of graphene between diamond particles; hence, a more dense and uniform structure was formed in the polycrystalline diamond layer after HTHP sintering.
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- 2020
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77. Resistance analysis and development of technical tools for drilling in a horizontal wellbore
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Liu Baochang, V.V. Neskoromnykh, and P.G. Petenev
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Wellbore ,Psychiatry and Mental health ,Neuropsychology and Physiological Psychology ,Resistance (ecology) ,Petroleum engineering ,Drilling ,Geology - Published
- 2020
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78. Concave PDC cutter
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Neskoromnykh, Vyacheslav Vasilievich, Popova, Marina Sergeevna, Komarovsky, Igor Andreevich, and Liu Baochang
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вогнутые поверхности ,PDC ,Materials Science (miscellaneous) ,vibration control ,rock formation ,компьютерное моделирование ,гидравлические процессы ,Management, Monitoring, Policy and Law ,Geotechnical Engineering and Engineering Geology ,drilling ,бурение ,горные породы ,PDC cutter ,вибрации ,Fuel Technology ,резцы ,буровые снаряды ,computer simulation ,породоразрушающие инструменты ,Economic Geology ,hydraulic processes ,Waste Management and Disposal - Abstract
Актуальность. Вибрации бурового снаряда любого происхождения, возникающие в процессе бурения скважины, приводят к снижению качества проводимых работ. Известные методы борьбы с данным явлением осложнены технически и технологически. При бурении породоразрушающим инструментом типа PDC одной из причин возникновения поперечных колебаний бурового инструмента является низкий уровень сил трения рабочей грани резцов о горную породу. Современные возможности синтеза алмазного материала позволяют изготавливать PDC различной формы и размеров. Разработки в области создания конструкции резца PDC с вогнутой рабочей поверхностью способствуют развитию методов профилактики поперечных колебаний резца и как следствие снижению уровня вибрации всей бурильной колонны. Цель: разработка конструкции породоразрушающего инструмента типа PDC, способствующей гашению вибраций бурового снаряда. Объект: особенности процесса взаимодействия горной породы с резцом PDC, обладающим вогнутой формой рабочей поверхности. Методы: метод имитационного компьютерного моделирования, метод научного познания, аналитические исследования, анализ. Результаты. Возникающие на вогнутой поверхности резца PDC усилия направлены на встречу друг другу и, противодействуя, предотвращают поперечное смещение бурового инструмента. Оптимальный угол вогнутости рабочей поверхности резца должен находиться в пределах от 104 до 155 градусов, именно такой интервал значений угла способствует созданию оптимальных условий производительности долота с сохранением антивибрационного эффекта. Конструкция резца PDC с вогнутой режущей поверхностью в виде конуса или сферы позволяет не только снижать вибрации инструмента, но и способствует очищению забоя и созданию зоны предразрушения горной породы перед резцом за счет энергии струи промывочной жидкости, что повышает эффективность разрушения горной породы. The relevance. Vibrations of a drill string of any origin, arising while drilling a well, lead to a decrease in the quality of the work performed. The known methods of combating this phenomenon are technically and technologically complicated. When drilling with a PDC-type rock cutting tool, one of the reasons for the occurrence of lateral vibrations of the drilling tool is the low level of friction forces of the working edge of the cutters against the rock. Modern possibilities for the synthesis of diamond material make it possible to manufacture PDCs of various shapes and sizes. Developments in the field of creating a PDC cutter with a concave working surface contribute to the development of methods for preventing lateral oscillations of the cutter, and as a result, reducing the vibration level of the entire drill string. The purpose of the research is to develop the design of the PDC-type rock cutting tool, which helps to damp the vibration of the drill string. Methods: method of computer simulation, method of scientific knowledge, analytical research, analysis. Results. The forces arising on the concave surface of the PDC cutter are directed towards each other, counteracting and preventing lateral displacement of the drilling tool. The optimal angle of concavity of the working surface of the cutter should be in the range from 104 to 155 degrees, it is this range of angle values that contributes to the creation of optimal conditions for the performance of the bit while maintaining the anti-vibration effect. The design of the PDC cutter with a concave cutting surface in the form of a cone or sphere allows not only reducing tool vibrations, but also contributes to cleaning the bottom and creating a zone of pre-fracture of the rock in front of the cutter due to the energy of the jet of drilling fluid, which increases the efficiency of rock destruction.
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- 2022
79. RETRACTED ARTICLE: Enhanced tensile strength and thermal conductivity in copper diamond composites with B4C coating
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Sun, Youhong, He, Linkai, Zhang, Chi, Meng, Qingnan, Liu, Baochang, Gao, Ke, Wen, Mao, and Zheng, Weitao
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- 2017
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80. Prediction of the Deformation of Aluminum Alloy Drill Pipes in Thermal Assembly Based on a BP Neural Network
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Wang, Xiaofeng, primary, Liu, Baochang, additional, Yun, Jiaqi, additional, Wang, Xueqi, additional, and Bai, Haoliang, additional
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- 2022
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81. Mechanical Properties and Interface Microstructure of Fe-Ni-Wc-Based Impregnated Diamond Composite Reinforced by Mo2c Layer
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Mao, Xinyue, primary, meng, qingnan, additional, Yuan, Mu, additional, Wang, Sifan, additional, Huang, Shiyin, additional, and Liu, Baochang, additional
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- 2022
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82. Decomposition Characteristics of Methane Hydrate in Porous Media Under Continuous and Intermittent Microwave Heating
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ZHU, Yue, primary, Li, Xuhui, additional, Zhao, Chuang, additional, Zhang, Jing, additional, Bondarenko, Volodymyr, additional, Dreus, Andrii, additional, Liang, Jinqiang, additional, Li, Xiaoyang, additional, Zhu, Jinlong, additional, Wang, Pengfei, additional, Li, Shengli, additional, and Liu, Baochang, additional
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- 2022
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83. Measurements of Total Sea Surface Mean Square Slope Field Based on SWIM Data
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Li, Xiuzhong, primary, Karaev, Vladimir, additional, Panfilova, Mariya, additional, Liu, Baochang, additional, Wang, Zhixiong, additional, Xu, Ying, additional, Liu, Jianqiang, additional, and He, Yijun, additional
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- 2022
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84. Collision Avoidance Strategy for the Autocrane
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Wang, Dong, primary, Liu, Baochang, additional, Shen, Jian, additional, Chen, Li, additional, and Zhu, Lydia, additional
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- 2021
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85. Enhancement of oxidation resistance via a self-healing boron carbide coating on diamond particles
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Sun, Youhong, Meng, Qingnan, Qian, Ming, Liu, Baochang, Gao, Ke, Ma, Yinlong, Wen, Mao, and Zheng, Weitao
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- 2016
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86. Toward Fast and Accurate SOH Prediction for Lithium-Ion Batteries
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Shen, Shuaiqi, primary, Liu, Baochang, additional, Zhang, Kuan, additional, and Ci, Song, additional
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- 2021
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87. The Historical Origin of Changchun Green Space System Planning Molds City Characteristics
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Liu Baochang, Shi Yucheng, and Sha Xiangxiang
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Architectural engineering ,Geography ,Business system planning ,Space (commercial competition) - Published
- 2021
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88. Influence of the bottom borehole zone environment on the efficiency of rock breaking by the PDC cutter
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Neskoromnykh, Vyacheslav Vasilievich, Popova, Marina Sergeevna, and Liu Baochang
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скалывание ,rock failure ,углубление ,cutting-chipping depth ,скорость ,разрушение пород ,compression core ,сопротивление среды ,drilling ,горные породы ,бурение ,PDC cutter ,cutting-chipping speed ,medium resistance ,резцы ,deepening ,резание ,сжатие - Abstract
Актуальность. Породоразрушающий инструмент, армированный резцами PDC, зарекомендовал себя как буровой инструмент с хорошими эксплуатационными показателями. Как известно из практики бурения, инструмент такого типа при правильной технологии его применения способен обеспечить высокие скорости проходки скважин и ресурс. Поэтому одним из приоритетных направлений в развитии технических средств бурения является совершенствование конструкций инструмента типа PDC. Методы проектирования бурового инструмента нового поколения должны основываться на комплексном подходе к исследованию его работы на забое. Одним из основных факторов, влияющих на эффективность реализации породоразрушающего инструмента, является сопротивление забоя. Исследованию изменения физико-механических свойств геологического разреза с глубиной посвящено большое количество трудов. А жидкая среда, образовавшаяся на забое скважины в результате процесса бурения, изучена слабо. Часто, при проведении научных исследований, наличием шлама в призабойной зоне пренебрегают. Однако, учитывая особенности формы и размеры режущей части резцов PDC, смесь шлама и непрерывно движущейся промывочной жидкости может обладать определенной плотностью и создавать выталкивающее усилие, действующее на плоскость резца, и как следствие оказывать влияние на эффективность работы бурового инструмента в целом. Поэтому актуальным вопросом является исследование свойств среды, состоящей из промывочного агента, шлама и разрушенной горной породы, и определение степени ее влияния на результаты работы бурового инструмента типа PDC. Цель: определить степень влияния сил сопротивления среды, образовавшейся в призабойной зоне скважины, на процесс бурения скважин. Методы: аналитический метод, метод компьютерного имитационного моделирования. Результаты. Среда, образовавшаяся в призабойной зоне в процессе бурения скважины и состоящая из породы, шлама и промывочной жидкости, находящихся в различном состоянии, оказывает выталкивающее действие на резец, что снижает величину углубления. Показатель степени сопротивления описанной среды определяется скоростью резания, углом установки резца и плотностью ее составляющих. Полученные результаты могут быть использованы при конструировании бурового инструмента типа PDC. Изменение угла установки или формы резца может способствовать не только снижению сил сопротивления, но и улучшению разрушающей способности инструмента за счет разуплотнения породы путем интенсификации проникновения жидкости в породу. The PDC cutter reinforced rock cutting tool has proven itself as a rock cutting tool with good performance. As it is known from drilling practice, a tool of this type, with the correct technology of its application, is capable of providing high rates of penetration of wells and resource. Therefore, one of the priority directions in the development of technical means of drilling is to improve the design of the PDC-type tool. New generation drilling tool design methods should be based on an integrated approach to the study of its work at the bottom. One of the main factors affecting the effectiveness of the implementation of rock cutting tools is the bottomhole resistance. A large number of works have been devoted to the study of changes in the physical and mechanical properties of a geological section with depth. And the liquid medium formed at the bottom of the well as a result of drilling is poorly studied. Often, when conducting scientific research, the presence of cuttings in the bottomhole zone is neglected. However, taking into account the peculiarities of the shape and size of the cutting part of the PDC cutters, the displacement of cuttings and continuously moving drilling fluid can have certain density and create a buoyant force acting on the plane of the cutter and, as a result, affect the efficiency of the drilling tool as a whole. Therefore, an urgent issue is to study the properties of the media, consisting of a flushing agent, cuttings and destroyed rock and determine the degree of its influence on the results of the PDC-type drilling tool. The purpose of the research is to determine the degree of influence of the resistance forces of the medium formed in the bottomhole zone of the well on well drilling. Methods: analytical method, computer simulation method. Results. The medium formed in the near-wellbore zone when drilling a well and consisting of rock, cuttings and flushing fluid, which are in different states, has a pushing effect on the cutter, which reduces the size of the deepening. The index of the resistance degree of the described medium is determined by the cutting speed, the angle of the cutter and the density of its components. The results obtained can be used in the design of a PDC-type drilling tool. Changing the angle of installation or the shape of the cutter can help not only to reduce the resistance forces, but also to improve the destructive ability of the tool due to the decompaction of the rock by intensifying liquid penetration into the rock.
- Published
- 2021
89. The Integration and Innovation of Modern Information Technology with Landscape Architecture Teaching under The Emerging Engineering
- Author
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Liu Baochang
- Subjects
Engineering ,Engineering management ,Landscape architecture ,business.industry ,Engineering education ,Knowledge engineering ,Big data ,ComputingMilieux_COMPUTERSANDEDUCATION ,Information technology ,Cloud computing ,Virtual reality ,business ,Bottleneck - Abstract
Under the background of Emerging Engineering Education construction in China, the necessity of integrating modern information technology into the Landscape Architecture teaching is analyzed in view of the demand for integrated Emerging Engineering talents, the characteristics of Landscape Architecture teaching and some bottleneck problems. Emerging Engineering Education has the characteristics of interaction and integration, cultivating outstanding engineering talents who are all-side and innovative, How to integrate mobile Internet, big data, cloud computing, artificial intelligence, virtual reality and other modern information technologies with Landscape Architecture teaching is discussed. Obvious effect has been obtained by researching, a new blended teaching model has been constructed, a feasible path for the transformation and upgrading of Landscape Architecture has been provided. Which provides a useful reference for the reform of Landscape Architecture education paradigm in China.
- Published
- 2021
- Full Text
- View/download PDF
90. Simulation and Experimental Research on Flow Field and Temperature Field of Diamond Impregnated Drill Bit
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Wang Shujing, Liu Baochang, Zhao Xinzhe, Han Zhe, Li Siqi, and Shengli Ji
- Subjects
Bit (horse) ,Materials science ,Drill ,Petroleum engineering ,Drilling fluid ,Heat generation ,engineering ,Drill bit ,Diamond ,Drilling ,engineering.material ,Volumetric flow rate - Abstract
Impregnated diamond bits (IDB) are one of the main rotary drilling tools used for hard rock drilling. In the process of using IDB to drill, the friction and heat generation with the rock formation are important factors which will affect the drilling efficiency. These two factors may reduce the technical and economic indicators of drilling and cause “burning” accidents. In order to improve the drilling efficiency of the diamond bit, the bit structure was reasonably designed to ensure that the bit had a good cooling and chip removal ability during the drilling process. The bottom flow field and temperature field of IDB were investigated by combining numerical simulation with experimental study. The results showed that, for the IDB with 4 water ways, on the side of the water way with the same rotating direction of the bit, the velocity was faster, and the maximum velocity reached 23.65 m/s. At the contact surface between the bit and rock, the temperature reached the highest level of 210 ℃ and dropped rapidly from bottom to top until it was close to the temperature of the flushing fluid. The increase of the number of water ways led to a small flow rate of drilling fluid at a single water way, which reduced the heat conduction efficiency and resulted in poor cooling effect and serious bit wear.
- Published
- 2021
- Full Text
- View/download PDF
91. Modern trends in development of PDC-type drilling tools
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Neskoromnykh, Vyacheslav Vasilievich, Liu Baochang, Pavel Gennadievich, Zhaoran Chen, Pavel Gennadievich, Petenev, Pavel Gennadievich, Popova, Marina Sergeevna, and Golovchenko, Anton Evgenievich
- Subjects
прочность ,PDC ,synthesis ,Materials Science (miscellaneous) ,Composite number ,Mechanical engineering ,grapheme ,Management, Monitoring, Policy and Law ,Blank ,Field (computer science) ,Rock breaking ,Superhard material ,сверхтвердые материалы ,Waste Management and Disposal ,графены ,Drill ,Process (computing) ,Drilling ,superhard materials ,современные направления ,Geotechnical Engineering and Engineering Geology ,поликристаллический алмаз ,PDC cutter ,Fuel Technology ,синтез ,буровые инструменты ,rock cutting tool ,polycrystalline diamond ,резцы ,совершенствование ,породоразрушающие инструменты ,Economic Geology ,strength - Abstract
Актуальность. Требования к буровому породоразрушающему инструменту заключаются в обеспечении высокой механической скорости, ресурса, широкой области применения и небольших материальных затрат на его приобретение. Иными словами, буровой инструмент должен быть прочным, износостойким и изготовлен из относительно недорогого материала. Достижения в области синтеза поликристаллического алмаза и изготовления из него резцов высокой прочности значительно расширили возможности производителей бурового инструмента. Синтетический сверхтвердый материал стали применять при изготовлении режущих элементов и всей рабочей части породоразрушающего инструмента. Новшества материаловедения позволили производить резцы типа PDC разной формы, размеров, прочности, что особо актуально при создании долот, коронок и буровых головок с комбинированным вооружением. Как известно, состав и условия спекания композита влияют на свойства получаемой заготовки резца PDC. Изменяя прочностные параметры и геометрию расположения режущих элементов PDC с учетом области применения инструмента, можно добиться наилучшего эффекта разрушения горной породы. Таким образом, при создании нового бурового породоразрушающего инструмента актуальным является объединение знаний и умений в области химии, материаловедения и конструирования, что приведет к получению перспективного породоразрушающего инструмента. Цель: определить направления совершенствования бурового инструмента типа PDC, а именно возможности материаловедения в области спекания сверхтвердого материала PDC, преимущества применения композита различного состава при проектировании новых конструкций бурового инструмента типа PDC. Объекты: состав материала, процесс спекания и получаемые свойства резцов PDC, конструктивные особенности бурового инструмента PDC. Методы: аналитические исследования, эксперимент, анализ. Результаты. Изменение состава композита позволяет регулировать прочностные свойства получаемого резца PDC. Добавление такого материала, как графен, повышает прочностные, тепло- и электропроводные свойства резца PDC. Объединение возможностей материаловедения и опыта конструирования позволяет добиться положительных результатов в области разработки нового перспективного породоразрушающего инструмента. Relevance. Requirements for rock cutting tools are to ensure high mechanical speed, resource, wide range of application and low material costs for its purchase. In other words, the drilling tool must be durable, wear-resistant, and made of relatively inexpensive material. Advances in the synthesis of polycrystalline diamond and the manufacture of high-strength cutters from it have significantly expanded the capabilities of drilling tool manufacturers. Synthetic superhard material began to be used in the manufacture of cutting elements and the entire working part of rock cutting tools. Innovations in materials science have made it possible to produce PDC cutters of various shapes, sizes, strengths, which is especially important when creating bits, crowns and drill heads with combined weapons. As is known, the composition and sintering conditions of the composite affect the properties of the resulting PDC cutter blank. By changing the strength parameters and the geometry of the PDC cutting elements, taking into account the field of application of the tool, you can achieve the best effect of rock breaking. Thus, when creating a new drilling rock cutting tool, it is relevant to combine knowledge and skills in the field of chemistry, materials science and design, which will lead to obtaining a promising rock cutting tool. The aim of the research is to determine the directions of improving the PDC-type drilling tool, namely, the possibilities of materials science in the field of sintering of superhard PDC material, the advantages of using a composite of various structure in the engineering of new designs of PDC-type drilling tools. Objects: composition of material, sintering process and obtained properties of PDC cutters, design features of PDC drilling tools. Methods: analytical research, experiment, analysis. Results. Changing the structure of the composite allows you to adjust the strength properties of the resulting PDC cutter. Addition of such a material as graphene increases the strength, thermal and electrical conductive properties of PDC cutter. Combining the capabilities of materials science and design experience makes it possible to achieve positive results in the development of a new promising rock cutting tool.
- Published
- 2021
92. Parameter estimation of moving targets in the SAR system with a low PRF sampling rate
- Author
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Liu, Yan, Wu, QiSong, Sun, GuangCai, Xing, MengDao, Liu, BaoChang, and Bao, Zheng
- Published
- 2012
- Full Text
- View/download PDF
93. Slant-range velocity estimation based on Small-FM-Rate Chirp
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Liu, Baochang, Wang, Tong, and Bao, Zheng
- Published
- 2008
- Full Text
- View/download PDF
94. Bistatic SAR data focusing using an omega-K algorithm based on method of series reversion
- Author
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Liu, Baochang, Wang, Tong, Wu, Qisong, and Bao, Zheng
- Subjects
Radar systems -- Analysis ,Radar systems -- Methods ,Algorithms -- Analysis ,Algorithms -- Methods ,Remote sensing -- Analysis ,Remote sensing -- Methods ,Algorithm ,Business ,Earth sciences ,Electronics and electrical industries - Published
- 2009
95. Doppler ambiguity resolving in compressed azimuth time and range frequency domain
- Author
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Liu, Baochang, Wang, Tong, and Bao, Zheng
- Subjects
Doppler effect -- Research ,Synthetic aperture radar -- Usage ,Center of mass -- Research ,Entropy (Information theory) -- Research ,Radon -- Properties ,Image processing -- Methods ,Business ,Earth sciences ,Electronics and electrical industries - Abstract
For high-quality synthetic aperture radar (SAR) processing, Doppler centroid ambiguity resolving is an essential procedure. A novel method for the resolution of Doppler ambiguity is presented which exploits the fact that, in the compressed azimuth time and range frequency domain, all targets span the same range frequency bandwidth and exhibit the same slope which is just proportional to the Doppler ambiguity number. The slope is removed by interpolation so that a simplified Radon transform can be applied. The use of entropy to find the maximum concentration of the Radon-transformed image can improve the robustness of the method. The proposed method directly gives a reliable estimate of the Doppler ambiguity number and is not affected by the azimuth partially covered targets. Experimental results show that the proposed method works well in medium- to high-contrast scenes. Index Terms--Doppler ambiguity resolution, Doppler centroid estimation, entropy, Radon transform, synthetic aperture radar (SAR).
- Published
- 2008
96. Drilling fluid circulation rate influence on the contact temperature during borehole drilling
- Author
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A.Yu. Dreus, Andrii Sudakov, A Kozhevnykov, and Liu Baochang
- Subjects
Circulation (fluid dynamics) ,Petroleum engineering ,Drilling fluid ,General Engineering ,Borehole ,Contact temperature ,Drilling ,Geotechnical Engineering and Engineering Geology ,Industrial and Manufacturing Engineering ,Geology - Published
- 2018
- Full Text
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97. Validation and Calibration of Nadir SWH Products From CFOSAT and HY‐2B With Satellites and In Situ Observations
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Li, Xiuzhong, primary, Xu, Ying, additional, Liu, Baochang, additional, Lin, Wenming, additional, He, Yijun, additional, and Liu, Jianqiang, additional
- Published
- 2021
- Full Text
- View/download PDF
98. Sea Surface Wind Retrieval Using the Combined Scatterometer and Altimeter Backscatter Measurements of the HY-2B Satellite
- Author
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Li, Xiuzhong, primary, Lin, Wenming, additional, Liu, Baochang, additional, Wang, Zhixiong, additional, Zhang, Biao, additional, and He, Yijun, additional
- Published
- 2021
- Full Text
- View/download PDF
99. A New Concept of Full Ocean Current Vector Retrieval With Spaceborne SAR Based on Intrapulse Beam-Switching Technique
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Liu, Baochang, primary, He, Yijun, additional, and Li, Xiuzhong, additional
- Published
- 2020
- Full Text
- View/download PDF
100. Improved Method to Suppress Azimuth Ambiguity for Current Velocity Measurement in Coastal Waters Based on ATI-SAR Systems
- Author
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Yi, Na, primary, He, Yijun, additional, and Liu, Baochang, additional
- Published
- 2020
- Full Text
- View/download PDF
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