考虑割理的深煤层水平井多段分簇间距优化研究  

Optimization of multi-stage cluster spacing in deep coal seam horizontal wells considering cleat

作　　者：车恒达 黄浩 陈明忠 孔祥伟[1,2] 郭良林 张昊 CHE Hengda;HUANG Hao;CHEN Mingzhong;KONG Xiangwei;GUO Lianglin;ZHANG Hao(School of Petroleum Engineering,Yangtze University,Wuhan 430100,China;Hubei Provincial Key Laboratory of Oil and Gas Drilling and Production Engineering,Yangtze University,Wuhan 430100,China;Downhole Service Company,CNPC Chuanqing Drilling Engineering Company Limited,Chengdu 610051,China)

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]长江大学油气钻采工程湖北省重点实验室,湖北武汉430100 [3]中国石油川庆钻探工程有限公司井下作业公司,四川成都610051

出　　处：《煤矿安全》2024年第11期69-76,共8页Safety in Coal Mines

基　　金：中海油“十四五”规划重大资助项目(CCL2022RCPS0471RSN,CCL2022RCPS0038ESN)。

摘　　要：为研究水平井多段多簇裂缝在割理发育的深部煤储层扩展情况,基于扩展有限元,考虑缝间干扰和诱导应力场,创建了多段多簇裂缝扩展模型;借助Python语言的前处理二次开发,在模型中加入大量近似正交的割理裂隙,分析了簇间距、压裂顺序和段间距对多裂缝扩展的影响,通过查询裂缝沟通割理组数,来验证压裂效果的优劣。模拟结果表明:簇间距在20 m,段间距控制在40~45 m时,裂缝沟通割理组数相对较多,且受到缝间干扰和诱导应力场影响较小,裂缝长度最优;在不同压裂顺序对多裂缝扩展的影响方面,压裂效果由优到劣排列为:顺序压裂>交替压裂>同步压裂;模型计算结果与现场应用吻合度较高,第2段压裂施工与模拟结果综合符合率为96.5%,第3段压裂施工与模拟结果综合符合率为93.4%。In order to study the horizontal well multi-segment multi-cluster fracture extension in the deep coal reservoir where the cleat fissures are developed,a multi-segment multi-cluster fracture extension model is created based on the extended finite element and taking into account the inter-seam interference and the induced stress field.With the secondary development of pre-processing in Python language,a large number of approximately orthogonal cleat fissures were added into the model.The effects of cluster spacing,fracturing sequence and segment spacing on multi-fracture extension were analyzed,and the advantages and disadvantages of fracturing effect were verified by querying the number of fracture-communicating cutting groups.The simulation results show that when the cluster spacing is 20 m and the segment spacing is 40-45 m,the number of fracture communication cutting groups is relatively high,and the fracture length is optimal due to the small influence of inter-seam interference and induced stress field;at the aspect of the influence of different fracturing sequences on the extension of multi-fractures,the fracturing effects are ranked from excellent to poor:sequential fracturing>alternating fracturing>synchronous fracturing.The results of modeling and field application are in good agreement,with 96.5%for the second fracturing section and 93.4%for the third fracturing section.

关 键 词：深煤岩储层 分段分簇压裂 割理裂隙 诱导应力 扩展有限元 

分 类 号：TD712[矿业工程—矿井通风与安全]