能源研究与管理2026，Vol.18Issue(3)：54-62,9.DOI:10.16056/j.2096-7705.2026.03.006
断层滑移作用下采油井套管力学行为及影响因素研究
Study on Mechanical Behavior and Influencing Factors of Production Well Casing under Fault Slip
摘要
Abstract
Fault slip can subject production well casing to complex shear,compression,and bending loads,often leading to casing dislocation and bending deformation,which constitutes one of the major casing damage modes threatening wellbore integrity and oil well life.To address this issue and implement appropriate preventive measures,this paper establishes a three-dimensional numerical coupling model of the formation-cement sheath-casing system under faulting,and analyzes the effects of fault displacement,formation elastic modulus,formation Poisson's ratio,and casing internal pressure on casing stress and strain.The results indicate that,as fault displacement increases,the casing deformation evolves from an"S"shape to a"Z"shape buckling,with significant increases in stress and strain,and the maximum strain amplification reaches 11 times.When the formation elastic modulus increases,the stress on the compression side above the fault decreases substantially,with a maximum reduction of 70.3％,while the stress below the fault increases,and the strain increases with the elastic modulus,with a maximum amplification of 2.6 times.The formation Poisson's ratio exhibits a nonlinear influence on casing stress and strain,at a low Poisson's ratio of 0.25,an obvious compressive strain mutation of 0.018 occurs at the fault location,indicating significant buckling.The effect of casing internal pressure is complex:away from the fault location,stress increases with internal pressure,while near the fault,stress and strain exhibit patterns of initial increase followed by decrease or continuous reduction.Based on the above analysis,fault displacement is the dominant controlling factor for casing instability,while formation elastic modulus,Poisson's ratio,and internal pressure significantly regulate the stress-strain response through a nonlinear coupling mechanism.In engineering practice,differentiated anti-buckling designs should be implemented for fault zones.关键词
走滑断层/套管/应力/应变/内压Key words
strike-slip fault/production casing/stress/strain/internal pressure of casing分类
能源科技引用本文复制引用
周振寰,张向阳,刘智泉,胡世伟,康玉阳,杨云..断层滑移作用下采油井套管力学行为及影响因素研究[J].能源研究与管理,2026,18(3):54-62,9.基金项目
江苏油田科研项目"井筒重建优化工艺应用" （）
