海上油田堵调驱技术驱油机理及剩余油分布研究  

Study on Oil Displacement Mechanism and Remaining Oil Distribution of Plugging-Profile Control-Flooding Technology in Offshore Oilfields

作　　者：李彦阅 黎慧 吕金龙 夏欢 宋鑫 肖丽华 马文国[2] LI Yan-yue;LI Hui;LV Jin-long;XIA Huan;SONG Xin;XIAO Li-hua;MA Wen-guo(Research Institute of CNOOC Tianjin Branch,Tianjin 300452,China;School of Petroleum Engineering,Northeast Petroleum University,Daqing Heilongjiang 163000,China)

机构地区：[1]中海石油(中国)有限公司天津分公司研究院,天津300452 [2]东北石油大学石油工程学院,黑龙江大庆163000

出　　处：《当代化工》2022年第1期139-143,150,共6页Contemporary Chemical Industry

基　　金：十三五国家科技重大专项课题,渤海油田高效采油工程及配套技术示范(项目编号:2016ZX-05-058-003);中海石油(中国)有限公司重点攻关课题,渤海油田强化水驱及增产挖潜技术(项目编号:CNOOC-KJ135 ZDXM36 TJ01TJ)。

摘　　要：目前渤海油田已处于高含水阶段,单纯凝胶封堵或聚合物微球调驱效果逐渐降低,实现稳油控水目标任务艰巨。为增强深部液流转向能力,油藏开发中提出了堵调驱技术理念,但其提高驱油效果机理尚不清楚。为此,以渤海B油田储层及流体特征为研究对象,首先分别开展了单独堵、调、驱和堵调驱技术的驱替实验,评价了堵调驱技术提高采收率幅度;并结合CT扫描成像技术,分别对不同开发方式和不同堵调驱开采阶段的岩心内流体分布进行成像观察,分析了岩心内剩余油的动用情况。结果表明:堵调驱技术体系采收率明显提高,相比单独驱替技术的采收率增幅为15.98%,其能够避免纯聚合物微球调驱或高效驱油剂驱液流转向能力有限、难以启动中低渗透层的问题,降低高渗透层低效循环比例。开展堵调驱联合作业可以实现在封堵高渗层扩大波及体积基础上,对中渗层进行有效调驱并启动低渗透层,提高洗油效率,实现"1+1+1>3"的开发效果。At present, Bohai oilfield has been in the stage of high water cut. The effect of gel plugging or polymer microsphere flooding is decreasing gradually, and the goal of stabilizing oil and water control is arduous. In order to enhance the steering ability of deep fluid flow, the concept of plugging and profile control flooding technology was put forward in reservoir development, but the mechanism of improving oil displacement effect is still unclear. For this reason, taking the reservoir and fluid characteristics of Bohai B oilfield as the research object, the displacement experiments of separate plugging, profile control, flooding and plugging profile control flooding technology were carried out respectively, and the enhanced oil recovery extent of plugging profile control flooding technology was evaluated. Combined with CT scanning imaging technology, the fluid distribution in the core of different development methods and different stages of plugging, profile control and flooding were observed, and the remaining oil production in the core was analyzed. The experimental results showed that, the oil recovery of plugging-profile control-flooding technology system was significantly improved, and the oil recovery was increased by 15.98% compared with the single displacement technology. It can avoid the problems of limited liquid flow diversion ability of pure polymer microspheres or high-efficiency oil displacement agent, and difficult to start the low permeability layer, and reduce the low efficiency circulation ratio of high permeability layer. On the basis of plugging the high permeability layer and expanding the swept volume, the joint operation of plugging, profile control and flooding can effectively control the medium permeability layer, start the low permeability layer, improve the oil washing efficiency, and achieve the development effect of "1 + 1 + 1 > 3".

关 键 词：渤海油田 剩余油分布 CT扫描技术 堵/调/驱技术 液流转向 提高采收率 

分 类 号：TE53[石油与天然气工程—油气田开发工程]