膨润土钻井液深钻技术在渤海某油田的应用

Application of bentonite slurry deep drilling technology in drilling and exploration operations in a certain oilfield in Bohai

叶周明 刘小刚 马英文 崔治军 关贺坤 杨晓静

YE Zhouming LIU Xiaogang MA Yingwen CUI Zhijun GUAN Hekun YANG Xiaojing

中海石油中国有限公司天津分公司，天津　300452 中海油能源发展工程技术公司，天津　300452 中海油能源发展天津人力资源服务分公司，天津　300456

Tianjin Branch of CNOOC China, Tianjin 300452, China China Oilfield Services Limited, Tianjin 300452, China Tianjin Human Resource Services limited Company , Tianjin 300456, China

通过分析渤海某油田的沉积环境、地质油藏概况和优化井身结构及井眼轨迹，优选钠基膨润土，添加增黏剂、烧碱和纯碱等添加剂提高动、静切力和确保pH 值大于10，并在淡水配制后让充分水化形成的膨润土钻井液深钻至馆陶组（垂深2 000 m 左右），实现了快速钻进，钻速由50~70 m/h 提高至90~100 m/h，扩大了上部井段的井径（由?342.9 mm 扩至?374.65 mm）、减少了起下钻和下套管作业的阻卡风险，而且节约了钻井液成本，形成了渤海油田降本增效和钻井提效典型技术。

In the course of drilling and exploration operations in a certain oilfield, the depositional environment and general situation of geological reservoir of such oilfield have been analyzed, the wellbore configuration and wellbore trajectory have been optimized, the sodium-based bentonite slurry has been properly selected, the additives such as tackifier, sodium hydroxide and sodium carbonate have been added so as to increase the dynamic/static shearing force and pH value (higher than 10), and the fully-hydrated bentonite slurry has been drilling deeply to Guantao Group (the vertical depth is about 2 000 m) after the preparation of freshwater . As a result, the quick drilling has been achieved, drilling rate increased from 50~70 m/h to 90~100 m/h, the diameter of upper section has been appropriately increased to reduce the jamming risk in trip/casing running operation, the costs of drilling fluid have been saved, and the typical technology for reducing costs and improving efficiency has been formed in Bohai Oilfield.

10.13639/j.odpt.2015.06.013