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二连盆地低阶煤层超低密度水泥浆固井技术 认领 被引量:4

Cementing Low-rank Coal Bed with Ultra-low Density Cement Slurry in Erlian Basin
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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1.06g/cm^3,流动度控制在19~20cm,析水为0mL,30℃稠化时间控制在1.5~4.5h,API失水量小于50mL,24h抗压强度大于3.5MPa,72h抗压强度大于6.0MPa,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%.
作者 刘景丽 彭松 王野 何景朝 姚晓军 毕毅 张鑫 贺兴伟 LIU Jingli;PENG Song;WANG Ye;HE Jingchao;YAO Xiaojun;BI Yi;ZHANG Xin;HE Xingwei(Engneering Technology Research Institute,BHDC,Tianjin 300450;CBM Business Unit of Huabei Oilfeild,Renqiu, Hebei062552;No.1 Cementing Branch of CNPC Bohai Drilling Engineering Company Limited, Renqiu, Hebei 062552)
出处 《钻井液与完井液》 CAS 北大核心 2019年第3期344-348,共5页 Drilling Fluid & Completion Fluid
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).
关键词 水泥浆 低阶煤 超低密度 固井 固井质量 Cement slurry Low-rank coal Ultra-low density Well cementing Job quality of well cementing
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