海上油田分注分采效果及其影响因素数值模拟——以渤海SZ36-1油田为例  

Numerical simulation of separate-layer injection-production effect and its influencing factors in offshore oilfield--by taking SZ36-1 oilfield in Bohai sea as an example

作　　者：刘义刚 孟祥海 张云宝 夏欢 曹豹 罗云龙 LIU Yigang;MENG Xianghai;ZHANG Yunbao;XIA Huan;CAO Bao;LUO Yunlong(Tianjin Company,CNOOC(China)Co.,Ltd.,Tanggu,Tianjin 300452,China;Key Laboratory of the Ministry of Education for Enhanced Oil Recovery,Northeast Petroleum University,Daqing,Heilongjiang 163318,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津塘沽300452 [2]东北石油大学提高油气采收率教育部重点实验室,黑龙江大庆163318

出　　处：《石油地质与工程》2020年第4期95-101,共7页Petroleum Geology and Engineering

基　　金：渤海油田智能分注分采产业化应用效果(CCL2017TJTZLST0772)。

摘　　要：依据渤海SZ36-1油田地质特征和流体性质,通过建立排状注采井网地质模型,利用CMG油藏数值模拟软件,开展了笼统注采、水井单独分注和“分注+分采”三种注采方式下的增油效果,以及影响“分注+分采”增油效果的因素研究。结果表明,实施分注分采有利于进一步扩大各层注入水波及体积,提高水驱采收率,但过早或过晚实施分采均会减弱增油效果,排状注采井网的最佳分采时机为含水90%,最优分注率为33%;随井排距比增大,采收率增幅呈现“先升后降”的趋势,合理井排距比为1.25;对平面非均质性强的油藏,实施分注分采可调整平面矛盾,改善驱替前缘呈“矩形”推进,从而提升增油效果。Based on the geological characteristics and fluid properties of SZ36-1 oilfield in Bohai sea,a theoretical model of row injection-production pattern is established by using CMG reservoir numerical simulation software,the effects of general injection and production,separate injection of water wells and"separate-layer injection-production",as well as its influencing factors are studied.The results show that the separate injection-production is beneficial to further expand the sweep volume of injected water in each layer and enhance water flooding recovery.However,the early or late separate production will weaken the oil increasing effect.The optimal time for the row injection-production pattern is that water cut reaches 90%water and the optimal injection rate is 33%.The recovery rate increases show a trend of"first up and then down"with the increase of well array distance ratio.The optimum well array distance ratio is 1.25.For the reservoir with strong plane heterogeneity,the separate injection-production can adjust the plane contradiction and improve the displacement front,advancing in"rectangular",so as to improve the oil production effect.

关 键 词：数值模拟 分注分采 分采时机 水驱开发效果 

分 类 号：TE53[石油与天然气工程—油气田开发工程]