Research on Safety Assessment Technology of Sustained Casing Pressure in Shale Gas

doi:10.11885/j.issn.1674-5086.2019.09.18.01

Abstract

Abstract: Aiming at the potential safety risks of wellbore annulus pressure caused by the integrity failure of the wellbore in the process of shale gas development, a safety risk assessment method for shale gas annulus compression wells is established. Based on the three key risk indicators of annulus pressure, cementing quality and formation integrity, this method considers the physical barrier, fluid barrier and operation management of shale gas wells based on fuzzy comprehensive evaluation theory. This method was applied to quantitative evaluation of the risk value and risk of 19 annulus pressure in a shale gas field. According to the results of risk assessment, a set of recommended practices for safety control of shale gas wells is presented from the aspects of determination of the maximum allowable value of annular pressure, diagnosis, monitoring and management of annular pressure, which provides important technical guidance for the safe production of shale gas wells.

Key words: shale gas well, SCP, risk assessment, fuzzy evaluation, security management

CLC Number:

TE37

ZENG Dezhi, YU Zhiming, HE Qiyao, LIU Qiaoping, SHI Taihe. Research on Safety Assessment Technology of Sustained Casing Pressure in Shale Gas[J]. 西南石油大学学报(自然科学版), 2019, 41(6): 146-154.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2019.09.18.01

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2019/V41/I6/146

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