致密储层水力压裂裂缝发育程度定量表征及影响因素分析  

Quantitative characterization and influencing factors analysisof hydraulic fracture in tight reservoir

作　　者：吴忠维 李贤宏 蔡鑫 崔传智 钱银 张航 王一单 任凭 喻高明[1,2] WU Zhongwei;LI Xianhong;CAI Xin;CUI Chuanzhi;QIAN Yin;ZHANG Hang;WANG Yidan;REN Ping;YU Gaoming(Hubei key laboratory of drilling and production engineering for oil and gas(Yangtze University),Wuhan 430100,Hubei;School of petroleum engineering,Yangtze University,Wuhan 430100,Hubei;Sinopec Shengli oilfield exploration and development research institute,Dongying 257000,Shandong;Ministry of education key laboratory of unconventional oil and gas development(China University of Petroleum(East China)),Qingdao 266580,Shandong;Jiangsu gas storage branch,national pipeline network corporation West-East gas transmission branch,Zhenjiang 212000,Jiangsu;Salt cave gas storage technology research center,China National Petroleum Company Limited,Zhenjiang 212000,Jiangsu)

机构地区：[1]油气钻采工程湖北省重点实验室(长江大学),湖北武汉430100 [2]长江大学石油工程学院,湖北武汉430100 [3]中国石化胜利油田勘探开发研究院,山东东营257000 [4]非常规油气开发教育部重点实验室(中国石油大学(华东)),山东青岛266580 [5]国家管网集团西气东输分公司江苏储气库分公司,江苏镇江212000 [6]中国石油天然气股份有限公司盐穴储气库技术研究中心,江苏镇江212000

出　　处：《长江大学学报（自然科学版）》2024年第4期80-87,共8页Journal of Yangtze University(Natural Science Edition)

基　　金：国家自然科学基金项目“致密油藏多段压裂水平井时空耦合流动模拟及产能预测”(51974343);中国石油化工股份有限公司科技部课题“东营凹陷页岩油立体开发优化设计关键技术”(P23026);油气钻采工程湖北省重点实验室开放基金项目“致密油藏压裂水平井全生命周期产能预测与参数优化研究”(YQZC202307)。

摘　　要：致密储层水力压裂裂缝发育程度定量表征对致密储层压裂开发优化具有重要意义,关于复杂裂缝发育程度定量表征指标多忽略改造区内裂缝发育情况。提出新的复杂裂缝发育程度定量表征指标,即拟裂缝密度,并以HN油田AP区块为例,分析复杂裂缝发育程度影响因素,且将其运用于指导实际矿场井。研究发现,随着应力差增加,拟裂缝密度先增加后降低。储层渗透率增加,拟裂缝密度降低,且降低趋势由慢变快。在HN油田AP区块所受应力、天然裂缝发育情况下(应力差10 MPa,两组天然裂缝同时发育),当射孔角度为0°、压裂液黏度为0.4 mPa·s时,能够获得最佳的压裂改造效果。将以上参数优选结果运用于指导矿场实际APX直井压裂,APX直井产量递减趋势得到了有效缓解,且在压裂12个月有效期内增油量1900 t。The quantitative characterization of the hydraulic fractures is of great significance to the fracturing optimization in tight reservoirs.At present,the quantitative characterization index of the complex fractures mostly ignores the fractures in the reconstruction area.Therefore,the article proposes a new quantitative characterization index for the complex fractures:pseudo fracture density.And then taking the AP block of HN oilfield as an example,the factors affecting the complex fractures are analyzed,and it is applied to guide actual field wells.It is found that as the stress difference increases,the pseudo fractures density first increases and then decreases.The permeability of the reservoir increases,the pseudo fractures density decreases,and the decreasing trend changes from slow to fast.Under the stress and natural fracture conditions in the AP block of HN oilfield(The stress difference is 10 MPa,and two sets of natural fractures are developed),the optimal fracturing simulation effect can be achieved when the perforation angle is 0°and the fracturing fluid viscosity is 0.4 mPa·s.The optimization results of the above parameters are applied to guide the hydraulic fracturing of the APX vertical well.The production decreasing trend of APX vertical well was effectively alleviated,and the oil production increased by 1900 t within the 12 months.

关 键 词：致密储层 复杂裂缝 定量表征 影响因素分析 拟裂缝密度 

分 类 号：TE357[石油与天然气工程—油气田开发工程]