安全、健康和环境2025，Vol.25Issue(3)：27-35,9.DOI:10.3969/j.issn.1672-7932.2025.03.004
断层滑移剪切套管变形模拟及安全控制方法
Fault Slip Shear Casing Deformation Simulation and Safety Control Methods
摘要
Abstract
The problem of casing shear deformation in shale gas multistage fracturing wells is prominent,which hindering the safe and efficient development of shale gas.At present,the mechanical characteristics of casing deformation under shear load are not clear and effective control methods are lacking.Therefore,the shear casing deformation model experiment was carried out,the constitutive characteristics of casing deformation were determined,and the numerical model of casing deformation under shear load was established,and the accuracy was verified by comparing with the experimental results.The sensitivity analysis of casing anti-shear deformation ability was further carried out,and the shear load-casing deformation relation chart was constructed.The engi-neering method of"using numerical model to invert formation shear load in casing deformation section,combi-ning with shear load-casing deformation relation chart,guiding casing safety selection in adjacent wells"was proposed.The results showed that the casing deformation under shear load went through two stages of elastic mi-cro-deformation and plastic large deformation.The stress-strain curve of the deformation process accorded with bilinear characteristics,and most casing will enter the plastic large deformation stage at 2～3 mm displacement.Increasing the casing wall thickness can significantly improve the shear deformation resistance of casing,but on-ly the primary safety control of the second and third casing deformation intervals can be achieved through the se-lection of casing wall thickness and steel grade.For extremely severe casing deformation zones,optimizing frac-turing parameters to prevent fault slip or reducing formation shear load should be considered to improve wellbore integrity.关键词
套管变形/断层滑移/剪切载荷/数值模型/页岩气Key words
casing deformation/fault slipping/shearing loads/numerical simulation/shale gas分类
石油、天然气工程引用本文复制引用
赵超杰,靳彦欣,闫柯乐,王子栋..断层滑移剪切套管变形模拟及安全控制方法[J].安全、健康和环境,2025,25(3):27-35,9.基金项目
国家自然科学基金项目(52304017),构造应力集中区水力压裂诱发断层滑移及套管剪切变形动力学机理研究. （52304017）
