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14 results on '"WANG Xiyong"'

2. Leukocyte CH25H is a potential diagnostic and prognostic marker for lung adenocarcinoma

Author

Zhang, Jun, primary, Xu, Lidong, additional, Gao, Jun, additional, Li, Jieyi, additional, Zhao, Xiaokai, additional, Yang, Pengmin, additional, Ge, Yujun, additional, Guo, Dawei, additional, Liu, Zhonghua, additional, Wang, Xiyong, additional, Gu, Wenchao, additional, Wang, Pengli, additional, Hu, Xun, additional, Gong, Ziying, additional, and Zhang, Daoyun, additional

Published
2022
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4. Study of failure mechanism of bottom-hole rock mass approaching a gas-fractured zone during nitrogen drilling

Author

Luo Chengbo, He Long, Wang Xiyong, Jiang Zujun, Xiao Guoyi, Li Gao, Yan Yan-cheng, Ou Biao, and Meng Yingfeng

Subjects
010504 meteorology & atmospheric sciences, Drilling, 010502 geochemistry & geophysics, 01 natural sciences, Debris, Shear (geology), Shear stress, General Earth and Planetary Sciences, Cylinder stress, Geotechnical engineering, Rock mass classification, Failure mode and effects analysis, Radial stress, Geology, 0105 earth and related environmental sciences, General Environmental Science
Abstract

In order to restore the normal development of nitrogen drilling technology, it is significant to gain a deep and comprehensive insight into the bottom-hole rock failure mechanism induced by gas-induced fracture. In this paper, the mechanism of bottom-hole rock failure induced by gas-induced fracture was analyzed by means of conventional analysis method of wellbore instability. The research suggests when the bottom-hole is gradually approaching the gas-induced fracture, the difference between circumferential stress and radial stress of the crack face gradually increases. The increasing shear stress caused by the difference between principal stresses leads to the compression-shear failure; then, the failure mode evolved from single-shear failure mode to combined mode of shear and tensile failure with the failure zone extending. If the wellbore is connected with the fracture, then the high-pressure gas in fracture carrying plenty of debris is injected into the wellbore, releasing lots of energy. The mechanism analysis of bottom-hole rock failure can explain the abnormal behaviors of logging data in well QL1 located in Baimamiao structural belt, Dayi County, Sichuan Province. The results not only provide a theoretical basis for the prevention and control of bottom-hole rock failure, but also provide a new perspective for studying the dynamic instability of deep rock in the field of petroleum engineering.

Published
2020
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