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Influencing factors and prevention measures of casing deformation in deep shale gas wells in Luzhou block,southern Sichuan Basin,SW China

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石油勘探与开发:英文版 2023年第4期50卷 979-988页

作者： HAN Lingling LI Xizhe LIU Zhaoyi DUAN Guifu WAN Yujin GUO Xiaolong GUO Wei CUI Yue University of Chinese Academy of Sciences Beijing 100049China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China Northeast Petroleum University Daqing 163318China

Based on structural distribution and fault characteristics of the Luzhou block,southern Sichuan Basin,as well as microseismic,well logging and in-situ stress data,the casing deformation behaviors of deep shale gas wells are summarized,and the casing deformation mechanism and influencing factors are ***,the risk assessment chart of casing deformation is plotted,and the measures for preventing and controlling casing deformation are ***-activated fault slip is a main factor causing the casing deformation in deep shale gas wells in the Luzhou *** the working area,the approximate fracture angle is primarily 10°-50°,accounting for 65.34%,and the critical pore pressure increment for fault-activation is 6.05-9.71 *** casing deformation caused by geological factors can be prevented/controlled by avoiding the faults at risk and deploying wells in areas with low value of stress *** casing deformation caused by engineering factors can be prevented/controlled by:(1)keeping wells avoid faults with risks of activation and slippage,or deploying wells in areas far from the faulting center if such avoidance is impossible;(2)optimizing the wellbore parameters,for example,adjusting the wellbore orientation to reduce the shear force on casing to a certain extent and thus mitigate the casing deformation;(3)optimizing the casing program to ensure that the curvature radius of the curved section of horizontal well is greater than 200 m while the drilling rate of high-quality reservoirs is not impaired;(4)optimizing the fracturing parameters,for example,increasing the evasive distance,lowering the single-operation pressure,and increasing the stage length,which can help effectively reduce the risk of casing deformation.

关键词： Sichuan Basin Luzhou block shale gas well casing deformation mechanism fault activation risk assessment prevention measure

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