库车山前盐层随钻扩眼尺寸优化研究  

Study on Size Optimization of Reaming while Drilling in Salt Layer of Kuche Piedmont

作　　者：周小君[1] 刘洪涛[1] 何世明[2,3] 周波 赵力[1] 汤明[2,3] 黄韬[2,3] ZHOU Xiaojun;LIU Hongtao;HE Shiming;ZHOU Bo;ZHAO Li;TANG Ming;HUANG Tao(CNPC Tarim Oilfield Company,Korla,Xinjiang 841000,China;Southwest Petroleum University,Chengdu,Sichuan 610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu,Sichuan 610500,China)

机构地区：[1]中国石油塔里木油田分公司 [2]西南石油大学 [3]油气藏地质及开发工程国家重点实验室

出　　处：《钻采工艺》2022年第3期37-41,共5页Drilling & Production Technology

基　　金：国家自然科学基金项目“基于水化进程的泥岩地层井壁坍塌机理研究”(编号:51904260);塔里木油田科研项目“山前复合盐膏层及目的层扩眼技术研究”(编号:201020081030)联合资助。

摘　　要：塔里木盆地库车山前构造盐层广泛发育,盐层井段Φ241.3 mm井眼钻井过程中阻卡井漏问题频发,采用扩眼技术增大环空间隙可有效解决阻卡和井漏复杂,但实际扩眼尺寸范围较大,不利于盐层扩眼技术的推广应用。文章以盐岩力学参数和蠕变规律为基础,利用有限元仿真模拟得到考虑盐岩蠕变、固井顶替效率和机械钻速综合影响下的扩眼尺寸优化推荐结果,并进行现场应用。结果表明:综合考虑盐岩蠕变、固井顶替效率和机械钻速等因素影响下的推荐扩眼尺寸为254~270 mm;应用井盐层段Φ241.3 mm井眼随钻扩眼至Φ266.7 mm,绝大部分井段井眼尺寸大于266.7 mm,工程参数与未扩眼邻井同层段相比差异小;扩眼后同返速下固井ECD最高下降0.052 g/cm^(3)、固井质量合格率及优质率较同区块邻井分别提高49%和39%,表明库车山前盐层段将井眼扩眼至Φ266.7 mm是科学合理的。研究成果对山前盐层段高效科学推广扩眼技术提供了理论和技术支撑。Salt layer is widely developed in Kuche Piedmont of Tarim Basin,the problem of stuck and leakage occurs frequently in 241.3 mm wellbore in salt layer during the drilling process.Using reaming technology to increase annular clearance can effectively solve the complexity of stuck and leakage,but the range of wellbore enlargement is various,which is not conducive to the popularization and application of salt-layer reaming technology.In this paper,based on mechanical parameters and creep mechanism of salt rock,dynamic simulation is used to obtain the results of the optimal wellbore reaming size considering the influence of creep mechanism of salt rock,cementing displacement efficiency and rate of penetrate before the field application is carried out.The result shows that the recommended wellbore enlargement size is 254~270 mm.The result of application well whose wellbore size is enlarged from 241.3 mm to 266.7 mm shows that after reaming the wellbore size of most section is greater than 266.7 mm,the engineering parameters compared with the un-reamed adjacent wells of the same section have nearly no difference.The ECD decreases by 0.052 g/cm^(3) at the same return speed,and compared with adjacent wells in the same block,the qualified rate and excellent rate of cementing increase by 49%and 39%respectively.Field application indicates that enlarging the wellbore from 241.3 mm to 266.7 mm in salt layer of Kuche piedmont is scientific and reasonable.The results provide theoretical and technical support for popularizing the reaming technology in the salt layer of Kuche piedmont.

关 键 词：库车山前构造 盐层扩眼 随钻扩眼 扩眼尺寸优化 盐岩蠕变 

分 类 号：TE256[石油与天然气工程—油气井工程]