钻井液与完井液2025，Vol.42Issue(6)：705-712,8.DOI:10.12358/j.issn.1001-5620.2025.06.001
南海西部油页岩低芳烃气制油基钻井液技术
Technology of Low Aromatic Oil-based Gas-to-liquid Drilling Fluid for Oil Shale in Western South China Sea
摘要
Abstract
The second member of Liushagang Formation in Weishan Sag,Beibuwan Basin,is oil shale with highly developed micro-fractures and high brittle mineral content.PLUS/KCl water-based drilling fluid was used in vertical well drilling in the early stage,resulting in serious wellbore instability and frequent blockage.The problems existing in the water-based and diesel-based drilling fluids used in the area were analyzed in the laboratory.Based on the formula of the on-site diesel-based drilling fluid,a set of high performance and low aromatics gas-to-oil drilling fluid system was constructed by introducing low viscosity and low aromatics gas-to-oil production and grading optimal micro-nano sealing agent materials.The system has a lower activity of 0.62,a high recovery rate of 98%,no leakage in 300 μm micro-crack plugging,a settlement factor less than 0.51,better inhibition and plugging,and stable high temperature performance.The gas-to-oil drilling fluid was applied in 8 highly inclined rock oil exploration wells,and the application well operation was smooth,and the diameter enlargement rate was less than 2%.Compared with the diesel-based drilling fluid system,the maximum funnel viscosity and plastic viscosity were reduced by 54%and 41%respectively,and the daily loss was reduced by 50%,and the comprehensive cost was reduced by about 85 million yuan.This technology provides powerful drilling fluid technical support for accelerating the development of offshore shale oil resources.关键词
油页岩/大斜度井/低芳烃气制油基钻井液/井壁稳定/北部湾Key words
Oil shale/Highly-deviated well/Low Aromatic oil-based gas-to-liquid drilling fluid/Wellbore-stability/Beibu Gulf分类
能源科技引用本文复制引用
刘智勤,崔应中,徐超,余意,彭巍..南海西部油页岩低芳烃气制油基钻井液技术[J].钻井液与完井液,2025,42(6):705-712,8.基金项目
中海石油(中国)有限公司重大科技项目"南海西部油田上产2000万方钻完井关键技术研究"(CNOOC-KJ135ZDXM38ZJ05ZJ)部分研究成果. （中国）
