复兴区块陆相页岩压裂成缝特征与增产改造策略分析  

Analysis of fracturing fracture characteristics and production increase and stimulation strategy of continental shale in Fuxing Block

作　　者：肖佳林[1] 李保林 游园[1] 常鑫 万洋辉 卢烁 张驰[3] XIAO Jialin;LI Baolin;YOU Yuan;CHANG Xin;WAN Yanghui;LU Shuo;ZHANG Chi(Petroleum Engineering Technology Research Institute,Jianghan Oilfield Company,SINOPEC,Wuhan 430035;Wuhan Institute of Geotechnical Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;Chongqing Fuling Shale Gas Exploration and Development Co.,Ltd.,SINOPEC,Chongqing 408100,China)

机构地区：[1]中国石化江汉油田分公司石油工程技术研究院,湖北武汉430035 [2]中科院武汉岩土力学研究所,湖北武汉430071 [3]中国石化重庆涪陵页岩气勘探开发有限公司,重庆408100

出　　处：《断块油气田》2024年第6期1066-1075,共10页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金项目“深层页岩暂堵压裂水力裂缝封堵机理及其转向扩展规律研究”(52104046);中国石化集团公司科研项目“复兴侏罗系陆相页岩油气水平井增产改造技术”(P21078-7)。

摘　　要：复兴区块侏罗系纵向发育东岳庙段、凉高山组等多套陆相页岩,页岩油资源量10.54×108 t,页岩气资源量1.51×1012 m3,具有良好的立体勘探开发前景。该陆相页岩具有黏土矿物含量高、夹层发育、油气同出等特点,面临复杂成缝难度大、穿层扩体难度高、有效支撑需求高等一系列难题。文中通过各层段岩石力学特性和多因素作用下破裂成缝影响机理研究,揭示了东岳庙段、凉高山组页岩压裂成缝规律的共性和差异,明确了垂向地应力差、夹层性质、注入排量、压裂液黏度是影响裂缝延伸扩展的关键因素,提出了以“持续提净压、转向促复杂”为核心的压裂改造策略,制定了多簇密布缝、循环变排量、不同粒径支撑剂循环充填、高频复合暂堵等工艺优化的具体措施。现场应用后取得了单井改造效果和测试产能双突破。The vertical development of multiple sets of continental shale in Dongyuemiao Member and Lianggaoshan Formation of the Jurassic in Fuxing Block has shale oil resources of 1.054 billion tons and shale gas resources of 1.51 trillion cubic meters,with good prospects for three-dimensional exploration and development.The continental shale in this area has characteristics of high clay mineral content,developed interlayers,and simultaneous oil and gas production,facing a series of difficulties such as high difficulty in complex fracture formation,high difficulty in layer penetration and propagation,and high demand for effective support.This paper conducted research on the rock mechanical properties of each layer and the mechanism of fracturing fracture formation under multiple factors,revealing the commonalities and differences in the fracturing fracture formation rules of the shale in Dongyuemiao Member and Lianggaoshan Formation.It was clarified that vertical ground stress difference,interlayer properties,injected displacement,and fracturing fluid viscosity are the key factors affecting fracture extension and propagation.A fracturing stimulation strategy with"continuous net pressure increase and diverting to promote complexity"being the core was proposed,and specific measures for technology optimization such as multi-cluster dense fractures,variable displacement circulation,different particle size proppant circulated filling,and high-frequency composite temporary plugging were put forward.Significant breakthroughs in single well stimulation and testing production capacity were achieved after on-site application of these measures.

关 键 词：陆相页岩 多夹层 破裂成缝 高含黏土矿物 改造策略 复兴区块 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]