川东地区低压易漏深井尾管固井技术  

Liner cementing technology for low pressureand easy leaking deep wells in eastern Sichuan

作　　者：李涛 钱栗 徐卫强 刘媛 LI Tao;QIAN Li;XU Weiqiang;LIU Yuan(Engineering Technology Research Institute of Southwest Oil&Gas Company,PetroChina,Chengdu,Sichuan 610017,China;Technical Consulting Center of Southwest Oil&Gas Company,PetroChina,Chengdu,Sichuan 610051,China)

机构地区：[1]中国石油西南油气田分公司工程技术研究院,四川成都610017 [2]中国石油西南油气田分公司技术咨询中心,四川成都610051

出　　处：《石油地质与工程》2023年第3期98-101,105,共5页Petroleum Geology and Engineering

基　　金：中国石油天然气集团公司重大现场试验项目“复杂超深井固井密封完整性技术现场试验”(2020F-49)。

摘　　要：YT1井是四川盆地川东地区老鹰岩构造的一口风险探井,四开采用∅241.30 mm钻头,从井深3319.0 m钻进至5506.0 m,下∅219.08 mm尾管固井封隔高台组顶以上低压易漏层和活跃气层。固井施工存在以下难点:①裸眼段的水泥浆防气窜性能要求高;②多层位井漏频发,固井井漏风险高;③井眼轨迹不平滑、井径不规则,井眼摩阻大,套管安全下入困难。为此,通过油基钻井液配合严格通井措施,采用1.20 g/cm 3低密度防气窜水泥浆体系配合精细控压固井技术及∅219.08 mm尾管固井,施工过程未发生漏失,固井质量合格率99.68%,优质率89.94%,有效解决了川东地区低压易漏深井尾管固井难题。Yingtan-1 well is a risk exploration well in Laoyingyan structure in eastern Sichuan Basin.During the fourth spud,∅241.30 mm bit was adopted,to drill from 3319.0 m to 5506.0 m,and∅219.08 mm liner cementing was used to isolate the low pressure and easy leaking formation and active gas formation above the top of Gaotai formation.The following difficulties exist in cementing construction:①The gas channeling prevention performance of cement slurry in the open hole section is required to be high;②Lost circulation occurs frequently at multiple locations,and the risk of lost circulation is high;③Because of the non-smooth well path,irregular well diameter and large wellbore friction,it’s not easy to run casing.Therefore,through the combination of oil-based drilling fluid and strict wiper trip measures,1.20 g/cm 3 low-density anti gas channeling cement slurry system was used with fine pressure control cementing technology and∅219.08 mm liner was used for cementing.There was no leakage during the cementing construction.The qualification rate was 99.68%,and the high-quality rate was 89.94%,which solved the problem of liner cementing in low-pressure and easy leaking deep wells in eastern Sichuan.

关 键 词：川东地区 深井 低压易漏 低密度水泥浆 固井 

分 类 号：TE256[石油与天然气工程—油气井工程]