摘要
针对页岩油气水平井钻探过程中井壁失稳风险大、高密度油基钻井液流变性能控制难度高的技术难题,通过性能评价,优选了乳化剂、润湿剂、有机土、提切剂等关键处理剂,优化形成密度2.10 g·cm^(-3)油基钻井液体系配方,体系经180℃老化后,破乳电压高于800 V,动塑比0.2以上,高温高压失水3.0 mL以内,抗岩屑污染至12%,抗冲洗液污染至10%,性能优良。现场应用结果表明,油基钻井液动切力8 Pa以上、破乳电压640~890 V,保证了长水平井安全施工,体现出良好的应用效果,适用于页岩气长水平井勘探开发。
In response to the technical challenges of high risks of wellbore instability and the difficulty in controlling rheological properties of high-density oil-based drilling fluids during the drilling of horizontal wells in shale oil and gas reservoirs,key treatment agents such as emulsifiers,wetting agents,organoclay and viscosifiers were selected through performance evaluation.An optimized oil-based drilling fluid system with a density of 2.10 g·cm^(-3) was developed.After aging at 180℃,the drilling fluid showed excellent properties,such as demulsification voltage higher than 800 V,plastic viscosity ratio above 0.2,high-temperature and high-pressure fluid loss less than 3.0 mL,and resistance to cuttings contamination up to 12%and to filtrate contamination up to 10%.Field application results showed that the yield point was above 8 Pa and the demulsification voltage was between 640 V and 890 V,ensuring the safe construction of long horizontal wells and demonstrating excellent application results.This system is suitable for the exploration and development of shale gas long horizontal wells.
作者
韩子轩
HAN Zixuan(State Center for Research and Development of Oil Shale Exploration,Beijing 102206,China;State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Beijing 102206,China;Sinopec Research Institute of Petroleum Engineering Co.,Ltd.,Beijing 102206,China)
出处
《当代化工》
2025年第11期2679-2682,共4页
Contemporary Chemical Industry
基金
深地国家科技重大专项项目(项目编号:2024ZD1003600)
中石化科技部项目(项目编号:P23207)。
关键词
页岩气
水平井
高密度油基钻井液
乳液
黏度
流变性
Shale gas
Horizontal well
High-density oil-based drilling fluid
Emulsions
Viscosity
Rheology
