页岩气水平井套管变形防治技术  

Casing deformation prevention and control technologies for shale gas horizontal wells and their application

作　　者：赵祚培[1] 钟森[1] 郑平 乔智国[3] 舒笑悦 Zhao Zuopei;Zhong Sen;Zheng Ping;Qiao Zhiguo;Shu Xiaoyue(Engineering Technological Management Department,Sinopec Southwest Oil&Gas Company,Chengdu,Sichuan 610041,China;Shale Gas Project Department,Sinopec Southwest Oil&Gas Company,Chongqing 402160,China;Petroleum Engineering Technolo-gy Institute,Sinopec Southwest Oil&Gas Company,Deyang,Sichuan 618000,China;Chendu College of University of Electronic Sci-ence and Technology of China,Chendu,Sichuan 611731)

机构地区：[1]中国石化西南油气分公司工程技术管理部,四川成都610041 [2]中国石化西南油气分公司页岩气项目部,重庆永川402160 [3]中国石化西南油气分公司石油工程技术研究院,四川德阳618000 [4]电子科技大学成都学院,四川成都611731

出　　处：《天然气技术与经济》2020年第6期47-52,共6页Natural Gas Technology and Economy

摘　　要：为了充分认识页岩气水平井套管变形的规律,形成有效的预防和控制措施,减小套变带来的经济损失,以四川盆地威荣页岩气田为研究对象,在前期评价井套变情况分析基础上,通过对裂缝发育、水平段轨迹、固井质量、套管载荷、压裂参数等对套变的影响研究,形成了地质工程综合性套变防治技术。研究结果表明:①套管变形主要由压裂引起地层剪切滑移挤压套管造成,属地质和工程综合因素所引起;②通过采取精细裂缝识别,提升井轨迹及固井质量,加厚套管壁厚,"一段一策"压裂参数针对性设计,施工压力控制等,实现了单井开发阶段全过程防控;③套变后采用长井段多级暂堵压裂进行补救,裂缝监测表明分段补救措施效果显著;④采取防治措施后,套变率及丢段率大幅度降低,满足了生产需求,成为深层页岩气有效开发的重要技术措施之一。In order to sufficiently clarify the casing deformation laws of shale gas wells,make the effectively preventive and control measures,and reduce the economic loss caused by casing deformation,Weirong shale gasfield was taken as an objective to study the effects of fracture development,horizontal section trajectory,cementing quality,casing load,and frac⁃turing parameters on casing deformation after analyzing the deformation in early appraisal wells.In this way,a technology integrated geology with engineering to prevent and control the casing deformation was developed.Results show that(1)the main deformation cause is that the casing is compressed by fracturing-induced stratigraphic shear slide,so casing deforma⁃tion is aroused by the integrated factor of geology and engineering;(2)whole-process prevention and control in the develop⁃ment stage of single well may be realized by fine fracture identification,hole trajectory,cementing quality improvement,casing wall thickening,specific fracturing parameter design of“one strategy for one stage”,and construction pressure control;(3)after casing deformation happens,long-hole section multi-stage temporary plugging fracturing can be adopted for remedy.And fracture monitoring indicates that the application of staged remedy measures obtained remarkable effect;and(4)after adopting these preventive and control measures,both deformation ratio and section missing ratio are reduced significantly,so as to meet production demand.They are the main technological measures available for the efficient devel⁃opment of deep shale gas.

关 键 词：页岩气 水平井 套管变形 防治技术 暂堵压裂 

分 类 号：TE37[石油与天然气工程—油气田开发工程]