泸203井钻井液技术优化研究  

Research on optimization of drilling fluid technology for Well Lu 203

作　　者：吴虞 何淼[2] WU Yu;HE Miao(The No.1 Drilling Company of Sinopec Jianghan Petroleum Engineering Corporation,Qianjiang 433100,China;Petroleum Engineering College,Yangtze University,Wuhan 430100,China)

机构地区：[1]中石化江汉石油工程有限公司钻井一公司,湖北潜江433100 [2]长江大学石油工程学院,湖北武汉430100

出　　处：《化学工程师》2021年第4期46-49,共4页Chemical Engineer

基　　金：国家自然科学基金(51904034)。

摘　　要：泸203井是我国页岩气示范区长宁区块的页岩气深井,由于地层的复杂性,现场钻井液存在抑制性不足、封堵性能不佳、滤失量大、无法有效稳定井壁、井眼垮塌风险大等难点。针对此难点,室内对现场钻井液进行了优化改造,改造后的钻井液体系相比优化前,大幅降低了老浆的黏度和切力,表观粘度降为18mPa·s,滤失量<2mL,体系抑制钻屑分散和钻屑造浆能力显著提高,二次滚动回收率大于90%,20%钻屑污染后体系粘切均在合理范围内,且形成的封堵层承压能力强。现场203H55-4井使用该优化体系后,流变性稳定,抑制封堵性强,应用效果良好。Well Lu 203 is a deep shale gas well in the Changning block of my country's shale gas demonstration area.Due to the complexity of the formation,the on-site drilling fluids have difficulties such as insufficient inhibition,poor plugging performance,large filter loss,inability to effectively stabilize the borehole wall,and high risk of borehole collapse.In view of this difficulty,the on-site drilling fluid was optimized and reformed in the laboratory.Compared with the optimized drilling fluid system,the viscosity and shear force of the old slurry were greatly reduced,the apparent viscosity was reduced to 18mPa·s,and the fluid loss was less than 2mL,The system's ability to inhibit drill cuttings dispersion and mud-making ability is significantly improved.The secondary rolling recovery rate is greater than 90%.After 20%drill cuttings pollution,the viscosity and shear force of the system are within a reasonable range,and the formed sealing layer has strong pressure bearing capacity.After the optimized system was used in Well 203H55-4,the rheological properties were stable,the blocking ability was strong,and the application effect was good.

关 键 词：流变性 抑制性 封堵性 稳定井壁 

分 类 号：TE254[石油与天然气工程—油气井工程]