CAJ | 학술논문

桥古区块卡普沙良群、库姆格列木群地层稳定性差，易发生井壁垮塌掉块、缩径、卡钻等井下复杂情况，尾管封固段气层活跃，防气窜难度大。分析总结前期固井情况，考虑地层岩性特征，优选出微膨胀防气窜盐水水泥浆体系，具有API失水小于50 mL、SPN值小于3、24 h水泥石强度大于14 MPa的特点；结合应用新型分段气窜预测模型，考虑领、尾浆胶凝失重、水泥浆失水、井口加压等因素对气层压稳的影响，较真实地预测气层压稳状况，并对固井施工工艺和参数进行了优化和改进。现场应用2口井均取得了良好效果，封固段综合评定优质，满足了桥古区块固井作业要求。
교고구괴잡보사량군、고모격렬목군지층은정성차，역발생정벽과탑도괴、축경、잡찬등정하복잡정황，미관봉고단기층활약，방기찬난도대。분석총결전기고정정황，고필지층암성특정，우선출미팽창방기찬염수수니장체계，구유API실수소우50 mL、SPN치소우3、24 h수니석강도대우14 MPa적특점；결합응용신형분단기찬예측모형，고필령、미장효응실중、수니장실수、정구가압등인소대기층압은적영향，교진실지예측기층압은상황，병대고정시공공예화삼수진행료우화화개진。현장응용2구정균취득료량호효과，봉고단종합평정우질，만족료교고구괴고정작업요구。
The stratum of the Kapushaliang group and Kumugeliemu group is unstable, causing downhole problems such as bore hole collapse, shrinkage and bit sticking. The gas layer in liner section is active, so it is dififcult to prevent gas channeling. Through analysis and summary on early cementing treatments, taking formation lithology characteristics into account, micro-swell brine cement slurry for gas channeling prevention was optimized, with API lfuid loss less than 50 mL,SPN value less than 3, and compressive strength higher than 14MPa/24 h. The new gas channeling model, which considered the impact of cement slurry static cementing strength, iflter loss and wellhead loading,was used to accurately forecast gas layer stabilization. The cementing technology and parameters were op-timized and improved. The technology was applied in 2 wells and achieved good results, with excellent cementing quality in isolation interval, which met the requirements of cementing in Qiaogu Block.