南海东部恩平21−4油田超深大位移水平井钻完井关键技术  

Key Drilling Technologies for Ultra-Deep Extended Reach Horizontal Well in Enping 21−4 Oilfield,Eastern South China Sea

作　　者：郭永宾 左坤 邓成辉 李晶晶 张凯 雷鸿 GUO Yongbin;ZUO Kun;DENG Chenghui;LI Jingjing;ZHANG Kai;LEI Hong(Shenzhen Branch of CNOOC Limited,Shenzhen,Guangdong,518064,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518064

出　　处：《石油钻探技术》2025年第2期11-20,共10页Petroleum Drilling Techniques

基　　金：中海石油(中国)有限公司深圳分公司科研项目“恩平高水垂比大位移井钻井极限分析与安全控制技术研究”(项目编号:SCKY−2023−SZ−15)部分研究内容。

摘　　要：恩平21−4油田位于南海东部海域,储量规模小,为满足其经济高效开发的需求,部署了2口超深大位移井。针对超深大位移井钻完井过程中存在的井漏风险高、井眼轨迹控制困难、井眼清洁难度大、安全作业密度窗口窄和摩阻扭矩高等技术难点,开展了井眼轨道优化设计及井眼轨迹精准控制、钻井液和水泥浆体系优化设计、套管安全下入、动态监测辅助诊断技术和完井管柱抗磨减阻技术等技术攻关研究,形成了超深大位移井钻完井关键技术,确保了2口超深大位移井顺利完钻和投产。其中恩平21−4−A1H井完钻井深9508.00 m,水平位移8689.00 m,水垂比4.43,创我国海上油气田井深最深纪录。恩平21−4油田超深大位移井钻完井关键技术不但丰富完善了我国大位移井技术体系,也为万米级边际油田高效开发提供了有力的技术支撑。The Enping 21−4 Oilfield,located in the eastern part of the South China Sea,has limited reserves.In order to meet the needs of economic and efficient development,two ultra-deep extended reach wells have been deployed.To address the challenges such as high risk of lost circulation,difficult trajectory control,poor wellbore cleaning efficiency,narrow safety density window,and high friction and torque in the ultra-deep extended reach wells during drilling and completion,a series of technologies were developed and applied.These technologies include wellbore trajectory design and precise control,drilling fluid and cement slurry system optimization,safe casing running,dynamic monitoring auxiliary diagnosis technology,and anti-wear friction-reducing completion strings solution.These innovations establish the key drilling and completion technologies for ultra-deep extended reach wells,ensuring the smooth drilling and production of these two wells.Notably,Well Enping 21−4−A1H achieved a total depth of 9508.0 m with a horizontal displacement of 8689.0 m,and the ratio of horizontal displacement to vertical depth is 4.43,which sets a new record for the deepest offshore oil and gas well in China.The key technologies for drilling and completion of ultra-deep extended reach wells applied in Enping 21−4 Oilfield not only enrich and improve the technical system of China’s extended reach wells but also provide robust technical support for the efficient development of 10000-meter-class marginal oilfields.

关 键 词：超深大位移井 井身结构 井眼轨迹控制 井眼清洁 漂浮下套管 固井 动态监测 恩平21−4油田 

分 类 号：TE243.2[石油与天然气工程—油气井工程]