深层页岩天然裂缝群发育下缝网压裂优化方法——以川南地区LH-7井为例  

Optimization method of fracture network fracturing in deep shale with natural fracture groups:a case study of Well LH-7 in southern Sichuan Basin

作　　者：高上钧 于志豪 罗彦力 任岚[2] 陈满 林然[2] 赵慧言 唐亮 任千秋 GAO Shangjun;YU Zhihao;LUO Yanli;REN Lan;CHEN Man;LIN Ran;ZHAO Huiyan;TANG Liang;REN Qianqiu(Sichuan Changning Gas Development Co.,Ltd.,Chengdu 610051,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]四川长宁天然气开发有限责任公司,四川成都610051 [2]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《断块油气田》2024年第3期403-408,共6页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金青年科学基金项目“基于DEM-LBM流固耦合的深层页岩气水力裂缝长效支撑理论与方法研究”(52104039);国家自然科学基金项目“深层超深层页岩气水平井压裂缝网高效建造理论与方法研究”(U21B2071);中国石油-西南石油大学创新联合体科技合作项目“多层叠置页岩储层地质力学参数场预测及缝网创建理论与优化技术”(2020CX030201)。

摘　　要：川南地区深层页岩气区块天然裂缝发育情况变化较大,压裂期间容易发生滤失严重、井间压窜等现象,对页岩气井缝网压裂效果存在显著影响。开展深层页岩地层天然裂缝群影响下的压裂缝网扩展模拟,并根据天然裂缝群特征针对性地进行缝网压裂参数优化,减少天然裂缝群造成的不利影响,有助于改善压裂效果,降低施工风险,提高气井最终采收率。文中构建了深层页岩天然裂缝群发育下的压裂缝网扩展模型,以川南地区LH-7井为例,绘制了天然裂缝群发育井段压裂优化设计系列图版,提出了裂缝发育井段压裂参数优化设计流程。该井采用压裂液变黏变排量缝网压裂设计,压裂液总量增多0.75%,缝网体积扩大14%,缝网建造效率提高13%,优化效果显著。The development of natural fractures in deep shale gas blocks in sounthern Sichuan Basin varies greatly,and phenomena such as severe fliter loss and inter-well pressure channeling during fracturing are prone to occur,which have a significant impact on the fracture network fracturing effect of shale gas wells.Carrying out the simulation of fracturing fracture network propagation under the influence of natural fractures and optimizing fracture network fracturing parameters according to the characteristics of natural fracture groups in deep shale layers can reduce the adverse effects caused by natural fractures,which is conducive to the improvement of fracturing effects,the reduction of construction risks,and the increase of the ultimate recovery of gas wells.In this study,a fracturing fracture network propagation model under the development of deep shale natural fracture groups was constructed,the diagrams of the optimal design of fracturing in well sections with developed natural fracture groups were drawn and the fracturing parameter optimization design process of well sections with developed fractures was proposed,taking Well LH-7 in southern Sichuan Basin as an example.Through fracturing fluid variable viscosity and displacement fracture network fracturing design,the total fracturing fluid volume of that well increased by 0.75%,the fracture network volume increased by 14%,and the construction efficiency of the fracture network increased by 13%,showing remarkable optimization effects.

关 键 词：深层页岩 天然裂缝群 缝网压裂设计 变黏变排量 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]