辽河海域高压气井月探1井套损补救固井技术  

Cementing technology for casing damage remediation of Well Yuetan-1 in the offshore area of Liaodong Bay

作　　者：胡晋军 史为纪 吴文兵 李庆永 HU Jinjun;SHI Weiji;WU Wenbing;LI Qingyong(Tianjin Boxing Engineering Science&Technology Co.,Ltd.,Tianjin 300451,China;Drilling Engineering Division,CNPC Offshore Engineering Co.,Ltd.,Tianjin 300280,China)

机构地区：[1]天津中油渤星工程科技有限公司 [2]中国石油集团海洋工程有限公司钻井工程事业部

出　　处：《石油钻采工艺》2023年第4期441-446,共6页Oil Drilling & Production Technology

摘　　要：月探1井是辽东湾海域的一口高压天然气井,三开固井过程中发现Ø244.5 mm套管柱在1238 m存在破损裂缝,导致高压气层2626~3690 m全部漏封。为有效恢复井筒完整性,满足四开钻进要求,根据电缆摄像机检测结果和月探1井井下复杂情况,研发了一套适用于挤水泥作业的低失水、低流阻、高触变、高防窜水泥浆体系,采用节流挤水泥封堵套损裂缝,应用承留器挤水泥和间歇性挤水泥封固高压气层,综合形成了一套高压气井套损补救固井技术。施工完成后,套管串试压20 MPa无压降,环空不带压,高压气层封隔良好,后期试采日产气19000 m^(3)/d。该研究为类似套损复杂情况的处理提供了技术参考。Well Yuetan-1 is a high-pressure gas well in the offshore area of Liaodong Bay.During cementing of the third casing section,theØ244.5 mm casing string was damaged and fractured at 1238 m,which led to the sealing loss across high-pressure gas reservoir intervals from 2626 m to 3690 m.In order to effectively restore well integrity and meet the drilling requirements of the fourth casing section,a cement slurry system with low water loss,low flow resistance,high thixotropy and high channeling prevention capacity and thus suitable for cement squeezing operations was developed,according to the inspection results of the downhole cable camera and the downhole complex situation of Well Yuetan-1.A casing damage remedial cementing technology for high-pressure gas wells was formed,in which casing damage cracks are sealed by choke cement squeeze,and the high-pressure gas reservoirs are isolated by retainer cement squeezing and intermittent cement squeezing cement.After the treatment,the casing string was pressuretested to 20 MPa with no pressure drop and no annular pressure,and the high-pressure gas reservoir was well sealed.The daily gas production in the trial production reached 19000 m^(3)/d.This technology and field application provide technical references for the treatment of similar complexities such as casing damage.

关 键 词：套损治理 高压气井 固井 挤水泥 水泥浆 井筒完整性 

分 类 号：TE256[石油与天然气工程—油气井工程]