特低渗油藏衰竭转水平井注水开发可行性研究  

Feasibility study on the development of ultra-low permeability reservoir from depletion-drive to horizontal well water injection development

作　　者：折建东 梁睿 董鹏[3] 史文洋 于海洋[3] SHE Jiandong;LIANG Rui;DONG Peng;SHI Wenyang;YU Haiyang(Wuqi Oil Production Plant of Yanchang Oilfield Co.,Ltd.,Wuqi Shaanxi 717600,China;Downhole Service Company,CNPC Chuanqing Drilling Engineering Company Limited,Chengdu Sichuan 610052,China;China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]延长油田股份有限公司吴起采油厂,陕西吴起717600 [2]中国石油川庆钻探工程公司井下作业公司,四川成都610052 [3]中国石油大学(北京),北京102249

出　　处：《石油化工应用》2021年第7期30-34,44,共6页Petrochemical Industry Application

基　　金：国家自然科学基金项目“致密油藏水平井同井缝间注采机理研究”,项目编号:U1762101;国家重大科技专项“丛式水平井井网优化设计与产能预测新技术”,项目编号:2017ZX05009-003。

摘　　要：BTG油区天然能量开发以来,由于产量过低,大量油井被迫停产。为了提高区块开发效果,进行了小层精细对比划分、沉积微相、砂体展布规律研究,通过开发动态分析表明,影响油井产量的重要因素是沉积微相、储层物性、压裂规模、布井方式。选择高潜力产油区,分别设计了定向井菱形反九点、定向井矩形和水平井共3种注采井网。采用油藏数值模拟方法计算了各方案开发指标,优选水平井交错注采井网作为最优方案,该方案井距500 m,排距150 m,水平井合理井底流压6 MPa,油水井合理注采比2.0,开采20年采出程度预计提高16.1%。本文工作为特低渗透油藏由天然能量衰竭式开发转变为水平井注水开发提供了技术借鉴。Many production wells in the BTG area have been shut down due to their low production.In order to improve the recovery of this area,extensive studies on fine description of small layers,sedimentary microfacies,and sand body distribution were investigated.The development dynamic analysis shows that the main factors for improving the ultimate oil production of this area are the distribution of sedimentary facies,reservoir properties,the scale of fracturing,and well pattern.For the high potential oil producing areas,three injection-production well patterns were designed,i.e.,directional well diamond inverted nine-point pattern,directional well rectangular pattern,and horizontal well pattern.Reservoir numerical simulation and development index optimization results suggest that the horizontal well staggered injection-production pattern was the optimal scheme.This scheme has a reasonable well spacing of 500 m,a row spacing of 150 m,a reasonable bottom hole flow pressure of 6 MPa,an injection-production ratio of 2.0.In 20 years of production,the use of horizontal wells staggered injection-production pattern can enhance recovery by 16.1%.The results are of great significance to improve water injection development recovery for similar reservoirs.

关 键 词：特低渗油藏 油藏精细描述 生产动态分析 水平井井网 水驱调整 

分 类 号：TE348[石油与天然气工程—油气田开发工程]