钻井液与完井液2024，Vol.41Issue(6)：728-735,8.DOI:10.12358/j.issn.1001-5620.2024.06.004
悬浮稳定关键材料及超高温长效稳定油基钻完井液
Key Suspension Materials and Ultra-High Temperature Long-term Stable Oil-Based Drilling and Completion Fluids
摘要
Abstract
To address the challenge of inadequate structural strength in the spatial framework of oil-based drilling and completion fluids under ultra-high temperatures and extended durations,which leads to poor solid phase carrying and suspension capabilities,two key materials were developed:an amphiphilic multiblock polymer viscosifier(HT-TQ)and an oil-soluble small molecule gelling agent(HT-CB).HT-TQ effectively enhances the yield point and low shear rate viscosity of the base emulsion,while HT-CB significantly improves the static yield point.Sepiolite fibers were selected as suspension enhancers,which,in synergy with HT-TQ and HT-CB,further improve the rheological properties of the emulsion after ultra-high temperature rolling and strengthen the spatial framework structure.Using these three suspension stabilizing materials as the core,optimal additives were selected to construct a highly stable oil-based drilling fluid system suitable for ultra-high temperatures.This system withstands temperatures up to 240℃,maintains a viscosity retention rate greater than 78%after five days of continuous ultra-high temperature rolling,with a yield point greater than 5 Pa and LSYP greater than 3 Pa,and exhibits excellent rheological properties under high temperature and high pressure.Additionally,by using compounded barite as a weighting material,a stable oil-based completion fluid system was developed,which withstands temperatures up to 240℃and remains homogeneous without hard settling after ten days of static exposure to ultra-high temperatures,with a settlement degree less than 1.2 N.These research findings provide technical support for efficient drilling and completion fluids in deep and ultra-deep oil and gas reservoirs.关键词
抗高温/油基钻井液/油基完井液/悬浮稳定性/协同作用Key words
High temperature resistance/Oil-based drilling fluid/Oil-based completing fluid/Suspension stability/Synergistic effect分类
能源科技引用本文复制引用
谢涛,张磊,杜明亮,李文龙,李治衡,刘海龙..悬浮稳定关键材料及超高温长效稳定油基钻完井液[J].钻井液与完井液,2024,41(6):728-735,8.基金项目
国家自然科学基金重大项目"深海深井钻井液漏失机理与防治方法研究"(U23B2082) （U23B2082）
中国石油大学(北京)科研基金"抗高温无土相油基钻井液流型调节剂研制与作用机理研究"(2462022YJRC005). （北京）
