射孔作业条件下水泥环损伤变化规律研究  

Damage of Cement Sheath under Perforation Conditions

作　　者：李辉 姚宇 丁建新 王海涛 王建华 席岩 Li Hui;Yao Yu;Ding Jianxin;Wang Haitao;Wang Jianhua;Xi Yan(Kunlun Digital Technology Co.,Ltd.;School of Architecture and Civil Engineering,Beijing University of Technology)

机构地区：[1]昆仑数智科技有限责任公司,北京市 [2]北京工业大学建筑工程学院

出　　处：《石油机械》2025年第4期80-87,共8页China Petroleum Machinery

基　　金：国家自然科学基金面上项目“CCUS工程多场耦合及跨时空尺度条件下井筒密封完整性失效机理及控制方法研究”(52374001)。

摘　　要：射孔作业是连接水平井和水力压裂2种技术的关键,同时射孔作业也会导致水泥环本体出现破坏。为定量分析射孔作业造成的水泥环结构完整性破坏程度,基于井筒圆形结构特征以及螺旋射孔的工程实际,采用Arbitrary Lagrange-Euler(ALE)流固耦合算法,建立了双射孔弹聚能射孔侵彻套管-水泥环-岩层组合体的三维有限元数值模型,并对数值模型进行了验证,分析了动态冲击载荷作用下水泥环的力学响应以及射孔参数(射孔密度、相位角)和水泥环材料参数(剪切模量)对水泥环损伤的影响规律。研究结果表明:建立的射孔数值模型计算结果与射孔弹实射孔径误差为3.15%,验证了数值模型的准确性;随着射孔密度增大,2孔眼之间应力叠加区域有效应力值增大;当保持射孔密度不变时,随着射孔相位角增大,该应力叠加区域有效应力值减小;射孔参数不变时,减小水泥环剪切模量有利于减小射孔孔眼周围水泥环损伤范围。研究结果可为射孔作业的开展以及射孔参数的优化提供有效参考。Perforation operation is crucial to bridging horizontal well and hydraulic fracturing technologies,but it may cause damage to the cement sheath.To quantitatively analyze the structural integrity damage of cement sheath caused by perforation operation,based on the circular structure feature of wellbore and the engineering practice of spiral perforation,the Arbitrary Lagrange-Euler(ALE)fluid-solid coupling algorithm was used to build a 3D finite element numerical model of the dual jet-charge penetration into the casing-cement sheath-rock combination.Then,the numerical model was verified.With this model,the mechanical response of the cement sheath under dynamic impact load and the influence of perforating parameters(e.g.perforation density,and phase angle)and cement sheath material parameters(e.g.shear modulus)on cement sheath damage were analyzed.The results show that the established numerical model yields the results with an error of 3.15%in relative to the actual perforation size,verifying the accuracy of the model.As the perforation density increases,the effective stress value in the stress superposition area between two perforations increases.Given a constant perforation density,as the phase angle in perforating increases,the effective stress value in the stress superposition area decreases.When the perforating parameters remain unchanged,reducing the shear modulus of the cement sheath is beneficial for narrowing the damage range of the cement sheath around the perforation.The research results provide effective reference for the implementation of perforating operation and the optimization of perforating parameters.

关 键 词：射孔作业 水泥环损伤 井筒完整性 有效应力 参数优化 

分 类 号：TE257[石油与天然气工程—油气井工程]