摘要
页岩油水平井储层段的井壁稳定至关重要,应用电镜扫描、X衍射、膨胀分散性实验及岩石力学测试等方法,对储层段泥岩矿物组构和理化性能进行了研究。结果表明,研究样品发育微裂隙,黏土含量高达62.24%,以伊利石为主,不含蒙脱石;呈现弱膨胀、弱分散、强亲油弱亲水的特征,在水基钻井液浸泡36h后,抗压强度下降24.8%。基于以上研究,优化水基硅酸盐钻井液性能及配套措施,形成了页岩油水平井井壁稳定技术。东平1井水平段长625m,一趟钻顺利完钻。
Wellbore stability in horizontal wells for shale oil reservoirs is very important.The mineral fabric and physical and chemical properties of mudstone in reservoirs were studied by means of electron microscopy scanning,X diffraction,expansion dispersibility testing and rock mechanics testing.The results showed that microcracks were developed in the samples,with clay content as high as 62.24%,mainly of illite and without montmorillonite,and it has the characteristics of weak expansion,weak dispersion,strong oil-wet and weak water-wet.After soaking in water-based drilling fluid for 36 hours,the compressive strength decreased by 24.8%.Based on the above research,the performance and supporting measures of water-based silicate drilling fluid were optimized to form the wellbore stability technique in horizontal wells for shale oil reservoirs.The horizontal section of Dongping-1 well is 625 m long,and the first drilling was completed successfully.
作者
王翔
WANG Xiang(Petroleum Engineering Technology Research Institute of North China Oil and Gas Company,SINOPEC,Zhengzhou,Henan 450006)
出处
《石油地质与工程》
CAS
2019年第4期88-91,共4页
Petroleum Geology and Engineering
基金
国家科技重大专项“中国典型盆地陆相页岩油勘探开发选区与目标评价”(2017ZX05049)
关键词
鄂尔多斯盆地:页岩油
水基钻井液
水平井井壁稳定
Ordos Basin
shale oil
horizontal well
water-based drilling fluid
wellbore stability in horizontalwells
