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31 results on '"Yao, Guoqing"'

23. Study and Application of Pressure Control Valve in Dual-Packer Multistage Fracturing System

Author

Chunhui Zhang, Lin Li, Wang Che, Fengshan Wang, Lihong Kong, Yao Guoqing, and Shujin Zhang

Subjects
Multiple stages, Petroleum engineering, Pressure control, Seal (mechanical), Dual (category theory), law.invention, law, medicine, Flushing, medicine.symptom, Oil field, Spark plug, Casing, Geology
Abstract

The dual-packer multistage fracturing system is the dominant horizontal well fracturing technique in the Daqing oil field, which adopts the dual packers to stimulate the targeted formations one by one. For several intervals, treatment can be done in one trip; reverse sand flushing and pulling the tubing upward fulfills the multiple stage fracturing operations. However, long time fluid discharge is needed before pulling the tubing upward in order to reduce the overflow of the tubing, which leads to the high-operation cost and the low job efficiency [1]. Tubing plug is often used to seal the oil pipe for pulling the tubing upward without fluid discharge. But the operation of running tubing plug is complicated and increases costs. Especially in horizontal well, it is difficult to run plug to working depth and set it. A new pressure control valve is developed and can achieve switching by controlling the pressure difference between tubing and casing, which offers a hydraulic control method to seal the oil pipe and makes the anti-blowout operation simple. Field runs have confirmed that this new pressure control valve is viable option to reduce the overflow of the tubing and improve operation efficiency in the dual-packer multistage fracturing operation.

Published
2018

25. The research of road extraction from high-resolution remote sensing image based on optimized watershed algorithm

Author

Cai Hongyue and Yao Guoqing

Subjects
Watershed, business.industry, Computer science, Binary image, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Mathematical morphology, computer.software_genre, Sample (graphics), Image (mathematics), Information extraction, Feature (computer vision), Preprocessor, Computer vision, Artificial intelligence, business, computer, Remote sensing
Abstract

Recently the major methods of extracting road from remote sensing image are manually. It becomes a hotpot to realize automatic information extraction of road according to the feature of high-resolution image and the characteristics of road. In this paper, an improved approach for road extraction based on Watershed segmentation is proposed according to theories of object-oriented and mathematical morphology. The image is first processed by improved Watershed segmentation to acquire feature-units after preprocessing. Then object-oriented method is used to analyze road feature-units in order to optimize the road extraction results. Finally, after binary image processing, the incomplete results can be removed and corrected by using mathematical morphological transformation. At last this paper gives the result and analysis of the experiment sample.

Published
2013

30. [Practices and Discusses on Medical Equipment Information Management of Military Hospital].

Author

Zheng X, Yao G, Jiang T, Liu N, Li T, and Zheng S

Subjects
Equipment and Supplies, Hospital, Hospital Information Systems, Software, Hospitals, Military, Information Management, Management Information Systems
Abstract

This paper briefly expounds the present situation of medical equipment information management in military hospitals. From basic structure and main function of the software systems, it gives a detailed introduction of the probes and researches on medical equipment information management in recent years. It analyzes the existing problems and shortcomings, combined with the previous achievements and effects, and then it introduces the ideas and goals of the new medical equipment management information system, which now being developed. Then it discusses the key problems of the new system which need to be solved.

Published
2017
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31. [Studies on blood viscosity and external thrombus in patients with silicosis and silicosis complicated with tuberculosis].

Author

Ni Y, Chai H, Jia W, Han Y, and Yao G

Subjects
Adult, Aged, Aged, 80 and over, Blood Viscosity, Humans, Male, Middle Aged, Severity of Illness Index, Silicosis complications, Silicosis pathology, Silicosis blood, Thrombosis etiology, Tuberculosis complications
Abstract

Objective: To explore the changes of blood viscosity and external thrombus in patients with silicosis and silicosis complicated with tuberculosis (TB)., Method: Blood viscosity and external thrombus were measured in 288 patients with silicosis, 178 patients with silicosis complicated by TB and 150 healthy subjects., Results: Blood viscosity and external thrombus value were significantly higher in the patients of silicosis and silicosis complicated with TB than in the healthy controls, except for patients of phase I of silicosis. Blood viscosity in the silicotics increased significantly with the advance of the disease, but no significant difference in external thrombus between patients in different phases. Apparent viscosity of whole blood significantly increased in the high-shear rate (200 s(-1)) and middle-shear rate (30 s(-1)) in patients of silicosis complicated with TB than in those without complication of TB at the same phases, but not seen in the low-shear rate (5 s(-1)) and in plasma viscosity, and the length and dried weight of external thrombus increased significantly too. There was no significant difference in blood viscosity and external thrombus between patients of silicosis at phase III and those of silicosis complicated with TB at the same phase., Conclusion: Blood in patients with silicosis appeared highly viscous and highly coagulant status. Blood viscosity and external thrombus value significantly increased with the advance of the disease, especially in the patients complicated with TB.

Published
2002

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