韩城区块煤层气井顶板控底重复压裂技术研究与应用  

Research and application of roof refracturing technology for controlled bottom seam height of coalbed methane well in Hancheng Block

作　　者：王伟 魏振吉[2,3] 季亮 张旺 张正朝 赵海峰 WANG Wei;WEI Zhenji;JI Liang;ZHANG Wang;ZHANG Zhengchao;ZHAO Haifeng(Hancheng Gas Production Management Area,PetroChina Coalbed Methane Company,Hancheng,Shaanxi 715400,China;China United Coalbed Methane National Engineering Research Center Co.,Ltd.,Beijing 100094,China;PetroChina Coalbed Methane Co.,Ltd.,Beijing 100028,China;College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中石油煤层气公司韩城采气管理区,陕西韩城715400 [2]中联煤层气国家工程研究中心有限责任公司,北京100094 [3]中石油煤层气有限责任公司,北京100028 [4]中国石油大学(北京)石油工程学院,北京102249

出　　处：《中国科技论文》2024年第1期33-42,49,共11页China Sciencepaper

基　　金：国家自然科学基金资助项目(11672333)。

摘　　要：针对鄂尔多斯盆地韩城区块碎软煤层气老井采用常规重复压裂技术效果不佳的难题,以X井为研究对象,分析了初次压裂改造效果及剩余气产能特征,结合二次加砂与顶板压裂,提出顶板控底重复压裂技术。利用实验与数值模拟软件优化施工参数,优选100目石英砂控底并暂堵老缝、40/70目+20/40目石英砂支撑新缝的三级加砂工艺,优化射孔位置为距煤层顶部3~5 m,施工排量为9 m^(3)/min,平均加砂比例为9%,形成增大储层改造体积、提高储层动用程度的顶板控底重复压裂技术。在X井进行现场试验,重复压裂后新增产气量268.1万m^(3),累计应用18口井,平均单井日产气量增加1 210.42 m^(3),有效解决了碎软煤层气老井重复压裂改造效果差的问题,可以满足煤层气老井二次开发及压裂作业降本增效的需求,具有良好的推广应用价值。In order to solve the problem of poor effect of conventional refracturing technology in soft crushed coalbed methane old wells in Hancheng Block,Ordos Basin,a refracturing technology of roof controlled bottom combined with secondary sand addition and roof fracturing was proposed in this paper via analyzing the effect of initial fracturing and the characteristics of residual gas produc-tivity by taking well X as the research object.The experiment and numerical simulation software were used to optimize the construc-tion parameters,and the three-stage sand addition process of 100-mesh quartz sand bottom control and temporary plugging of the old joint and 40/70 mesh+20/40 mesh quartz sand supported new joint technology was selected.The optimized perforation position was 3-5 m from the top of the coal seam,the construction displacement was 9 m^(3)/min,and the average sand addition ratio was 9%.The roof-controlled bottom refracturing technology is formed to increase reservoir reconstruction volume and improve reservoir utilization degree.Field tests were carried out in well X,and after repeated fracturing,the new gas production was 2.681 million m^(3).Eighteen wells were applied,and the average daily gas production per well was increased by 1210.42 m^(3),which effectively solved the prob-lem of poor re-fracturing effect of soft crushed coalbed methane old wells,and could meet the demand of cost reduction and efficiency elevation in secondary development and fracturing operations of coalbed methane old wells.The technology developed herein has good value of popularization and application.

关 键 词：煤层气 韩城区块 碎软煤层 老井重复压裂 支撑剂暂堵 

分 类 号：TE377[石油与天然气工程—油气田开发工程]