鄂尔多斯盆地深层煤岩气水平井水平段安全钻井关键技术  

Key Technologies for Safe Drilling in Horizontal Section of Deep Coal Rock Gas Horizontal Well in Ordos Basin

作　　者：史配铭 倪华峰 贺会锋 石崇东 李录科 张延兵 SHI Peiming;NI Huafeng;HE Huifeng;SHI Chongdong;LI Luke;ZHANG Yanbing(Changqing Drilling Corporation,CNPC Chuanqing Drilling Engineering Co.Ltd.,Xi’an,Shaanxi,710018,China)

机构地区：[1]中国石油集团川庆钻探工程有限公司长庆钻井总公司,陕西西安710018

出　　处：《石油钻探技术》2025年第1期17-23,共7页Petroleum Drilling Techniques

基　　金：中国石油集团川庆钻探工程有限公司长庆钻井总公司致密气藏工程技术中心重点科技计划项目“盆地东部本溪组8#煤岩层水平井储层安全快速钻完井关键技术研究”(编号:CQ2024B-8-18-3-Z)。

摘　　要：鄂尔多斯盆地东部气田深层煤岩气水平井目的层本溪组8^(#)煤层埋藏深,非均质性强,钻井过程中存在机械钻速低、井壁易失稳垮塌、井下故障复杂频发、水平段延伸难度大和完井套管下入困难等技术难点。为此,在分析本溪组8^(#)煤岩地层特征和钻井技术难点的基础上,进行了倒划眼高效PDC钻头研制、提速工具优选和无稳定器防卡导向钻具组合优化,研究了水平段精细导向井眼轨迹控制技术、旋转下套管技术及微纳米强抑制高效水基钻井液技术,形成了鄂尔多斯盆地深层煤岩气水平井水平段安全钻井关键技术。该技术在鄂尔多斯盆地东部气田绥德-米脂区块10口深层煤岩气水平井进行了应用,应用井在水平段钻进过程中未发生井壁失稳等井下故障,顺利钻至设计完钻井深,套管顺利下至设计位置,平均机械钻速9.00m/h,较未应用该技术邻井NL1H井提高了48.51%。现场应用表明,鄂尔多斯盆地深层煤岩气水平井水平段安全钻井关键技术可以克服该盆地东部气田深层煤岩气水平井水平段钻进过程中的技术难点,提高水平段机械钻速及煤岩储层的钻遇率,为该盆地深层媒岩气的开发提供技术支撑。In the target layer of the deep coal rock gas horizontal well in the eastern gas field of Ordos Basin,the 8^(#)coal seam of the Benxi Formation is deeply buried and has strong heterogeneity.During the drilling process,there are technical difficulties such as low rate of penetration(ROP),easy instability and collapse of the wellbore,complex and frequent downhole faults,difficult extension of the horizontal section,and challenging completion casing running.Therefore,on the basis of analyzing the characteristics of the 8^(#)coal seam of the Benxi Formation and technical difficulties during drilling,the optimization of high-efficiency PDC bit and speed-up tool for reverse reaming,optimization of steering drilling tool assembly without stabilizer for sticking prevention,fine steering trajectory control technology for horizontal sections,rotary casing running technology,and micro-nano strong inhibition of highefficiency water-based drilling fluid system technology were conducted,and key technologies for safe drilling in horizontal sections of deep coal rock gas horizontal wells in Ordos Basin were developed.The technologies were applied to 10 deep coal rock gas horizontal wells in the Suide-Mizhi Block of the eastern gas field of Ordos Basin.No downhole faults such as wellbore instability occurred in the drilling process of horizontal sections,and the wells were successfully drilled to the designed completion depth.The casing was smoothly run to the designed position,with an average ROP of 9.00 m/h,indicating a 48.51%increase compared with the adjacent Well NL1H without the technologies applied.Field applications show that the key technologies for safe drilling in horizontal sections of deep coal rock gas horizontal wells in Ordos Basin can overcome the technical difficulties in the drilling process of horizontal sections of deep coal rock gas horizontal wells in the eastern gas fields of the basin,improve the mechanical drilling rate of the horizontal sections and the drilling rate of the coal rock reservoir,and provi

关 键 词：深层煤岩气 水平井 井身结构 机械钻速 井眼轨迹 水基钻井液 鄂尔多斯盆地 

分 类 号：TE21[石油与天然气工程—油气井工程]