二连盆地低阶煤层超低密度水泥浆固井技术

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英文篇名：Cementing Low-rank Coal Bed with Ultra-low Density Cement Slurry in Erlian Basin 作者：刘景丽 ; 彭松 ; 王野 ; 何景朝 ; 姚晓军 ; 毕毅 ; 张鑫 ; 贺兴伟 英文作者：LIU Jingli;PENG Song;WANG Ye;HE Jingchao;YAO Xiaojun;BI Yi;ZHANG Xin;HE Xingwei;Engneering Technology Research Institute BHDC;CBM Business Unit of Huabei Oilfeild;No.1 Cementing Branch of CNPC Bohai Drilling Engineering Company Limited; 关键词：水泥浆 ; 低阶煤 ; 超低密度 ; 固井 ; 固井质量 英文关键词：Cement slurry;;Low-rank coal;;Ultra-low density;;Well cementing;;Job quality of well cementing 中文刊名：ZJYW 英文刊名：Drilling Fluid & Completion Fluid 机构：渤海钻探工程技术研究院;华北油田煤层气事业部;渤海钻探第一固井分公司; 出版日期：2019-05-30 出版单位：钻井液与完井液 年：2019 期：v.36;No.199 基金：渤海钻探公司级项目“超低密度水泥浆体系研究与应用”(2019Z29K) 语种：中文; 页：ZJYW201903014 页数：5 CN：03 ISSN：13-1118/TE 分类号：85-89

摘要

为解决二连盆地低阶煤层常规低密度水泥浆固井漏失严重、返高低等难题,针对该煤矿区微裂缝较发育、岩层强度低导致承压能力低的特点,研发出一套超低密度水泥浆体系,配套使用的稳定增强材料解决了配制超低密水泥浆时易出现的微珠上浮、水泥下沉的分层离析现象,同时分析了水泥浆体系失水对煤储层的影响。该超低密度水泥浆的现场应用密度最低达1.06 g/cm3,流动度控制在19～20 cm,析水为0 mL,30℃稠化时间控制在1.5～4.5 h,API失水量小于50mL,24 h抗压强度大于3.5 MPa,72 h抗压强度大于6.0 MPa,综合性能优良。该超低密度水泥浆体系已在华北油田的二连盆地应用5井次,均实现了单级固井返至井口的要求,固井质量合格率为100%。
        Wells drilled in the Erlian Basin penetrate coal beds with developed fractures, and some of the formations have low strength,resulting in severe lost circulation during well cementing with low density cement slurries, and the cement slurries generally didn't return to the designed heights. An ultra-low density cement slurry was developed to address these problems. A stability enhancement additive was used in the cement to prevent the separation of micro beads and cement. The minimum density of this cement slurry obtained in field application was 1.06 g/cm~3. Other properties of the cement slurry were as follows: mobility controlled within 19-20 cm, free water 0 mL, 30 ℃ thickening time controlled within 1.5-4.5 h, API filter loss less than 50 mL, 24 h compressive strength greater than 3.5 MPa, 72 h compressive strength greater than 6.0 MPa. The overall performance of the cement slurry is exchis cement slurry has been used 5 times in Erlian Basin(Huabei Oilfield), with all cement slurry returned to the surface in single-stage well cementing, and the pass rate of cementing job quality was 100%.

引文

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