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7. The influence of steam stimulation on compression coefficient of heavy oil reservoirs

Author

Yan Chuanliang, Cheng Yuanfang, Tian Ji, Zhu Guojin, Yuan Zhongchao, Liu Yuwen, and Deng Fucheng

Subjects
Steam stimulation, Temperature, Pore pressure, Cycle, Compression coefficient, Petroleum refining. Petroleum products, TP690-692.5, Petrology, QE420-499
Abstract

Abstract The diminishing oil resources make the exploration and development of heavy oil reservoirs more and more important. Heavy oil reservoirs need steam stimulation or other thermal development methods; temperature increasing during the thermal recovery process will inevitably affect the reservoir compressive characteristics. In order to study the variation of the compression coefficient of heavy oil reservoirs in the multi-round steam stimulation process, the compression coefficients of the reservoirs after different temperature and pore pressure cycles were tested. The results show that the compression coefficient of heavy oil reservoir decreases with the increase in effective confining pressure and increases with the increase in test temperature; After the temperature and pore pressure cycle, the compression coefficient of the rock is greatly reduced; the decrease in range of compression coefficient of the reservoir after the temperature and pore pressure cycle increases with the increase in the test temperature, and increases with the increase in maximum effective confining pressure. The dynamic variation of the reservoir compression coefficient must be taken into account in the prediction of the production capacity of multi-round steam stimulation.

Published
2017
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12. Respiratory Monitoring by a Field Ionization Sensor Based on Trichel Pulses

Author

Kaichen Song, Lingyun Ye, and Deng Fucheng

Subjects
Respiratory rate, Acoustics, Airflow, Analytical chemistry, Respiratory monitoring, lcsh:Chemical technology, Biochemistry, Article, Analytical Chemistry, Plate electrode, Respiratory Rate, Ionization, Humans, lcsh:TP1-1185, Electrical and Electronic Engineering, Instrumentation, Electrodes, Monitoring, Physiologic, field ionization sensor, Chemistry, Humidity, Signal Processing, Computer-Assisted, Atomic and Molecular Physics, and Optics, Trichel pulses, Exhalation, Field desorption, Electrode, respiratory monitoring, Voltage
Abstract

In this paper, a novel method for respiratory monitoring is presented. The method is based on Trichel pulses (TPs) using a simple field ionization sensor which consists of a needle electrode and a plate electrode. Experiments have been conducted to demonstrate that different respiratory patterns, including normal, ultra-fast, deep breaths, and apnea could be easily monitored in real time by detecting the changes in the TP frequency. The vital capacity could also be assessed by calculating the variation of TP frequency. It is found that the operation principle of the proposed sensor is based on the effects of breath airflow and the atomized water in exhaled air on the TP frequency by changing the ionization process and the dynamics of charged particles in the short gap. The influences of applied voltage and ambient parameters have also been investigated.

Published
2014

20. Wellbore stability analysis and its application in the Fergana basin, central Asia

Author

Deng Jingen, Liu Hailong, Yu Baohua, Deng Fucheng, Hu Lianbo, Zhu Hai-yan, Chen Zijian, Yan Chuanliang, and Han Qin

Subjects
Lost circulation, Bedding, Petroleum engineering, Drilling, Geology, Management, Monitoring, Policy and Law, Structural basin, Instability, Industrial and Manufacturing Engineering, Wellbore, Geophysics, Drilling fluid, Oil shale
Abstract

Wellbore instability is one of the major problems hampering the drilling speed in the Fergana basin. Comprehensive analysis of the geological and engineering data in this area indicates that the Fergana basin is characterized by high in situ stress and plenty of natural fractures, especially in the formations which are rich in bedding structure and have several high-pressure systems. Complex accidents such as wellbore collapse, sticking, well kick and lost circulation happen frequently. Tests and theoretical analysis reveals that the wellbore instability in the Fergana basin was influenced by multiple interactive mechanisms dominated by the instability of the bedding shale. Selecting a proper drilling fluid density and improving the sealing characteristic of the applied drilling fluid is the key to preventing wellbore instability in the Fergana basin. The mechanical mechanism of wellbore instability in the Fergana basin was analysed and a method to determine the proper drilling fluid density was proposed. The research results were successfully used to guide the drilling work of the Jida-4 well; compared with the Jida-3 well, the drilling cycle of the Jida-4 well was reduced by 32%.

Published
2014
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