摘要
四川龙马溪组页岩地层水敏性强、微裂缝及裂缝发育,钻井过程中井壁坍塌事故频发,严重制约了页岩气的高效开发。为解决上述难题,引入了一种既能抑制页岩水化膨胀与分散,又能封堵孔隙、微裂缝及裂缝,同时使页岩表面疏水的改性二氧化硅封堵剂。并以该封堵剂为核心,优选降滤失剂、润滑剂等,研制了一种疏水强封堵水基钻井液。该钻井液既具有良好的流变性、降滤失性,又具有优异的抑制、封堵、疏水和抗污染能力。该钻井液的页岩回收率达90.2%,对40~60目砂床渗入深度仅为1.5 cm,密度为2.2 g/cm^(3)时高温高压滤失量为7.2 mL。
The shale formation of the Longmaxi Formation in Sichuan is highly water sensitive,with micro-cracks and cracks developed.During the drilling process,the shaft wall collapsed frequently,which severely restricted the efficient development of shale gas.In order to solve the above problems,this paper introduces a hydrophobically modified silica plugging agent that can not only inhibit shale hydration expansion and dispersion,but also block pores,micro-cracks and cracks,and make the shale surface hydrophobic.And with the core of the plugging agent,combined with fluid loss additives,lubricants,etc.,a hydrophobic and strong plugging water-based drilling fluid was studied.The drilling fluid not only has good rheology and fluid loss reduction properties,but also has excellent inhibition,plugging,hydrophobic and anti-pollution capabilities.The shale recovery rate of the drilling fluid is 90.2%,the penetration depth into the 40-60 mesh sand bed is only 1.5 cm,and the high temperature and high pressure filtration loss is 7.2 mL when the density is 2.2 g/cm^(3).
作者
康圆
孙金声
吕开河
刘敬平
张文超
滕宇翔
修卓洋
黄宁
KANG Yuan;SUN Jinsheng;LYU Kaihe;LIU Jingping;ZHANG Wenchao;TENG Yuxiang;XIU Zhuoyang;HUANG Ning(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580;CNPC Engineering Technology R&D Company Limited,Changping,Beijing 10206)
出处
《钻井液与完井液》
CAS
北大核心
2021年第4期442-448,共7页
Drilling Fluid & Completion Fluid
基金
国家自然科学基金“富伊利石页岩气地层水化失稳机理及化学物理耦合控制方法研究”(ZX20190201)。
关键词
页岩气
水基钻井液
疏水
封堵
抑制
Shale
Water-based drilling fluid
Hydrophobic
Plugging
Suppression
