塔里木库车山前深井窄间隙小尾管固井技术

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英文篇名：Cementing Small Liner Strings with Narrow Clearance in Deep Wells in the Kuche Piedmont Structure in Tarim Basin 作者：张峰 ; 刘子帅 ; 李宁 ; 于永金 ; 艾正青 ; 张弛 英文作者：ZHANG Feng;LIU Zishuai;LI Ning;YU Yongjin;AI Zhengqing;ZHANG Chi;Research Institute of Oil and Gas Engineering,PetroChina Tarim Oilfield Company;CNPC Engineering Technology R&D Company Limited; 关键词：深井固井 ; 尾管固井 ; 窄间隙 ; 抗高温高强度水泥浆 ; 抗高温冲洗隔离液 ; 水基钻井液 ; 库车山前 英文关键词：Deep well cementing;;Liner cementing;;Narrow clearance;;High temperature high strength cement slurry;;High temperature flushing spacer;;Water base drilling fluid;;Piedmont in Kuche 中文刊名：钻井液与完井液 英文刊名：Drilling Fluid & Completion Fluid 机构：中国石油塔里木油田分公司油气工程研究院;中国石油集团工程技术研究院有限公司; 出版日期：2019-07-30 出版单位：钻井液与完井液 年：2019 期：04 基金：“塔里木盆地大油气田增储上产关键技术研究与应用”课题8“超深井钻井提速提质关键技术研究与应用”（2018E-1808）;; “弹塑性水泥浆体系评价研究与应用”（201018081021） 语种：中文; 页：82-88+94 页数：8 CN：13-1118/TE ISSN：1001-5620 分类号：TE256

摘要

库车山前是塔里木油田增储上产的重点区域,井深通常在6000～7000 m左右,地质条件复杂,已钻遇井最高温度近180℃,最高气藏压力为150 MPa。钻井采用五开井身结构,目的层巴什基奇克组专打,厚度较薄,约为200 m,采用尾管固井工艺。井深、温度高(120～180℃)、窄间隙(11～18 mm)、小尾管约200 m,对水泥浆抗温性能、流变性能及力学性能均提出了挑战,同时部分井采用水基钻井液,滤饼厚、清除困难,保证固井施工安全及胶结质量困难。针对以上难点,优选抗高温高强度水泥浆体系、抗高温冲洗隔离液体系,同时配套固井工艺,形成适合库车山前固井的深井窄间隙小尾管固井技术,可大幅度提升环空的冲洗顶替效率,同时水泥浆强度发展快,有利于提高水泥石胶结质量,确保后期负压验窜顺利实施。该技术在大北1101井φ127 mm尾管固井中应用,固井合格率为97.2%,优质率为79.4%,负压差33 MPa验窜合格,创山前水基钻井液固井质量最高记录。
        The Kuche Piedmont is an important oil production area of the Tarim oilfield. Well depths in this area are generally between 6,000 m and 7,000 m, and geological conditions are very complex. The maximum temperature encountered during drilling was 180 ℃ and the maximum gas reservoir pressure 150 MPa. Wells of five intervals were drilled to the Bashijiqike Formation, the target formation of only 200 m in thickness, and cased with liner string. In designing the thermal stability, rheology and mechanical property of the cement slurries, consideration has to be given to the challenges such as well depth, bottom hole temperatures(120-180 ℃), narrow clearance between borehole and the liner string, and the length of the liner string of only 200 m. Meanwhile, some of the wells were drilled with water base drilling fluids, leaving thick mud cakes on the borehole wall which were difficult to remove. This presented challenges to performing the cementing job with safety and high quality. To address these difficulties, cement slurries with high thermal stability and high strength as well as high temperature flushing spaces that are able to clean the mud cakes were selected for cementing the wells. A special cementing technique was engineered to use in combination with the cement slurries and spacers. Using this cementing technology, the efficiency of displacing annular space was greatly improved, and the strength of the cement slurries was developed quickly, which in turn improved the bonding quality of set cement and ensured the performing of late-stage channeling test at negative differential pressure. This technology has been applied in cementing the φ127 mm liner string in the well Dabei-1101, 97.2% of the cementing was qualified and 79.4% excellent. The cementing of the liner string passed the channeling test at 33 MPa negative differential pressure.

引文

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