气顶边水油藏初期合理采油速度三维物理模拟实验  

Three-dimensional physical simulation experiment of reasonable initial oil recovery rate for the gas cap/edge water reservoirs

作　　者：葛丽珍 孟智强 朱志强 祝晓林 王永平 GE Lizhen;MENG Zhiqiang;ZHU Zhiqiang;ZHU Xiaolin;WANG Yongping(CNOOC China Limited,Tianjin Branch,Tianjin 300459)

机构地区：[1]中海石油(中国)有限公司天津分公司

出　　处：《中国海上油气》2019年第6期99-105,共7页China Offshore Oil and Gas

基　　金：“十三五”国家科技重大专项“渤海油田加密调整及提高采收率油藏工程技术示范（编号：2016ZX05058-001）”部分研究成果

摘　　要：为了解初期采油速度对气顶边水窄油环油藏开发效果的影响规律,提高该类油藏的采收率,以渤海JZ油田大气顶边水窄油环油藏A为原型,根据相似准则设计了大型三维物理模型,进行了开发初期采油速度分别为3%和5%的室内实验,分析了不同采油速度对开发效果的影响。实验结果表明:降低初期采油速度能够有效防止气顶气沿储层顶部窜进,延缓大气窜通道的形成,提高纵向波及;初期采油速度由5%降至3%,模型稳产时间延长了241.5%,无气窜采出程度增加5.89个百分点,最终采收率增加2.96个百分点。矿场生产实践表明,渤海JZ油田大气顶窄油环油藏采用降低初期采油速度生产策略(由6%降至3%),取得了较好的开发效果,因此气顶边水油藏开发初期以3%左右采油速度生产,并适当调整采油速度保证油藏开发初期稳定生产不气窜是提高该类油藏采收率的有效手段。In order to understand the influence of initial oil recovery rate on the development effect of narrow oil ring reservoirs with gas cap and edge water,and improve the recovery factor of this type of reservoirs,by taking the JZ large gas cap/edge water narrow oil ring reservoir in the Bohai sea as a prototype,a large-scale three-dimensional physical model was designed as per the similarity criterion,and laboratory experiments were carried out for the initial oil recovery rates of 3% and 5% respectively,so as to analyze the effects of different oil recovery rates on development effect.The experimental results show that the reduction of initial oil recovery rate can effectively prevent the channeling of gas cap along the top of reservoir,delay the formation of major gas channeling pathway and increase the lateral sweepage;once the initial oil recovery rate is decreased from 5% to 3%,the stable production time of this model is extended by 241.5%,the gas channeling-free recovery percent is increased by 5.89%,and the ultimate recovery factor is increased by 2.96%.The field practices show that since the JZ large gas cap/edge water narrow oil ring reservoir in the Bohai sea adopted the production strategy of reducing the initial oil recovery rate(from 6% to 3%),agood development effect has been achieved.Therefore,it is an effective means of improving the recovery factor to maintain an initial recovery rate of about 3%and make appropriate adjustment to ensure stable initial production and avoid gas channeling during the initial development stage of gas cap/edge water reservoirs.

关 键 词：气顶油藏 边水 开发初期 采油速度 开发效果 物理模拟实验 

分 类 号：TE341[石油与天然气工程—油气田开发工程]