基于震源机制的套管变形量控制方法研究  

Control Method of Casing Deformation Based on Focal Mechanism

作　　者：吴建忠[1] 乔智国[2] 慈建发[2] 何龙[2] 连威 李军 WU Jianzhong;QIAO Zhiguo;CI Jianfa;HE Long;LIAN Wei;LI Jun(Science and Technology Management Department,Sinopec Southwest China Oil and Gas Company,Deyang,Sichuan 618400,China;Research Institute of Engineering Technology,Sinopec Southwest China Oil and Gas Company,Deyang,Sichuan 618400,China;China University of Petroleum(Beijing)at Karamay,Karamay,Xinjiang 834000,Chinna;China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石化西南油气分公司科技管理部,四川德阳618400 [2]中国石化西南油气分公司石油工程技术研究院,四川德阳618400 [3]中国石油大学(北京)克拉玛依校区,新疆克拉玛依834000 [4]中国石油大学(北京),北京102249

出　　处：《石油管材与仪器》2022年第3期24-31,共8页Petroleum Tubular Goods & Instruments

基　　金：国家自然科学基金企业创新发展联合基金项目“海相深层高温高压钻完井工程基础理论及控制方法”(编号:U19B6003-05);国家自然科学基金联合基金重点项目“页岩气水平井井筒完整性失效机理与控制方法”(编号:U1762211);中国石油化工股份有限公司西南油气分公司横向委托课题“威荣深层页岩气井套管变形预防与控制关键技术研究”(编号:34450000-20-ZC0607-0006)。

摘　　要：基于震源机制基本方程,研究了水力压裂过程中断层滑移量和矩震级的关系;进一步建立了断层滑移条件下的套管-水泥环-地层组合体数值模型,分析了断层滑移条件下的套管变形规律,从而明确套管变形量和矩震级的关系。结论认为:压裂过程中矩震级小于2级时,地层滑移量基本为0,矩震级大于2级时,地层滑移量随着矩震级的增加呈指数增加;套管变形量的主要影响因素为地层滑移距离,增加套管钢级、壁厚不能完全防止套管变形;矩震级小于3级时,套管变形量基本为0,矩震级大于3级时,套管变形量随着矩震级的增加呈指数增加,建议多级压裂过程中监测到矩震级接近3级时,降低施工强度或者停止施工,防止地层滑移导致套管变形。Based on the basic equation of focal mechanism,this paper studies the relationship between slip amount of fault layer and moment magnitude during hydraulic fracturing.Furthermore,the numerical model of casing-cement sheath-formation combination under the condition of fault slip is established,and the relationship between casing deformation and fault slip is analyzed,so as to clarify the relationship between casing deformation and moment magnitude.It is concluded that in the fracturing process,when the moment magnitude is less than 2,the amount of formation slip is basically 0;when the moment magnitude is greater than 2,the amount of formation slip increases exponentially with the increase of moment magnitude.The main influencing factors of casing deformation are formation slip distance,increasing casing steel grade and wall thickness can not avoid casing deformation.When the moment magnitude is less than 3,the casing deformation is basically 0.When the moment magnitude is greater than 3,the casing deformation increases exponentially with the increase of moment magnitude.It is suggested that when the moment magnitude is close to 3,the construction intensity should be reduced or the construction should be stopped to prevent the casing deformation caused by formation sliding.

关 键 词：水力压裂 套管变形 微地震 地层滑移 震源机制 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]