基于FEM-DFN的页岩气井复杂裂缝扩展与优化——以长宁页岩气藏X1水平井组为例  

Propagation and optimization of complex fractures of shale gas wells based on FEM-DFN:taking horizontal well group X1 in Changning shale gas reservoir as an example

作　　者：郑健 何永生 汪勇 蔡景顺 唐煊赫 朱海燕 ZHENG Jian;HE Yongsheng;WANG Yong;CAI Jingshun;TANG Xuanhe;ZHU Haiyan(Sichuan Changning Natural Gas Co.,Ltd.,Yibin 644400,China;College of Energy,Chengdu University of Technology,Chengdu 610041,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610041,China)

机构地区：[1]四川长宁天然气开发有限责任公司,四川宜宾644400 [2]成都理工大学能源学院,四川成都610041 [3]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610041

出　　处：《断块油气田》2024年第3期415-423,共9页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金青年基金项目“深层页岩缝口暂堵压裂多簇复杂裂缝交错扩展机理研究”(52204005);国家自然科学基金重大项目“开采过程多场时空演变规律与流动调控方法”(52192622);四川省自然科学基金青年基金项目“四川盆地深层页岩气藏暂堵压裂缝网形成机理研究”(2023NSFSC0944)。

摘　　要：对长宁页岩气示范区水平井裂缝扩展形态认识不清、井间干扰频繁等问题严重制约了页岩气藏的高效开采。对此,文中基于地质-工程一体化思想,结合适用于多井压裂分析的有限元-离散裂缝网络(FEM-DFN)方法,分析了水平井组体积裂缝扩展形态及天然裂缝对水力裂缝扩展的影响,厘清了井间干扰因素。结果表明:在天然裂缝带发育区域,天然裂缝带对水力裂缝的诱导、捕获和阻隔作用主导了水力裂缝的扩展行为;天然裂缝带导致的水力裂缝不对称扩展、非均匀起裂是造成井间干扰的重要原因;天然裂缝带中各类裂缝的发育程度对水力裂缝扩展有重大影响。该研究成果可为长宁页岩气藏高效水力压裂参数设计提供支撑和依据。Problems such as the unclear understanding of fracture propagation pattern of horizontal wells and frequent inter-well interfaces in Changning Shale Gas Demonstration Area have seriously restricted the high-efficient exploitation of shale gas reservoirs.To address this problem,based on the idea of geology-engineering integration,combined with the finite element-discrete fracture network(FEM-DFN)method applicable to multi-well fracturing analysis,the volume fracture propagation pattern of horizontal well groups and the influence of natural fractures on hydraulic fracture propagation were analyzed,and the inter-well interference factors were clarified.The reseults show that:in the area where natural fracture zones are developed,the natural fracture zone dominates the hydraulic fracture propagation behaviors by inducing,capturing and blocking the hydraulic fractures.The asymmetric propagation of hydraulic fractures caused by natural fracture zones and non-uniform fracture initiation are important reasons for inter-well interferences.The degree of development of various types of fractures in natural fracture zones has a significant impact on hydraulic fracture propagation.The research results can provide support and basis for the design of high-efficient hydraulic fracturing parameters in Changning shale gas reservoir.

关 键 词：水力压裂 天然裂缝 裂缝扩展 井间干扰 

分 类 号：TE319[石油与天然气工程—油气田开发工程]