渤海河流相底水稠油油藏特高含水期极限驱油效率认识  

Ultimate Displacement Efficiency of Heavy Oil Reservoir with Bottom Water Formed by Fluvial Deposition in Bohai Oilfiled at Ultra-high Water Cut Stage

作　　者：李金宜 何逸凡 刘博伟 张运来 胡治华 洪鑫 LI Jinyi;HE Yifan;LIU Bowei;ZHANG Yunlai;HU Zhihua;HONG Xin(Bohai Petroleum Research Institute,Tianjin Branch of CNOOC(China)Ltd.,Tianjin 300459,China;Bohai Central Laboratory,CNOOC Experimental Center,Tianjin 300452,China)

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300459 [2]中海油实验中心渤海实验中心,天津300452

出　　处：《海洋石油》2022年第4期24-30,共7页Offshore Oil

基　　金：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”(2016ZX05058-001);中海石油(中国)有限公司重大项目“渤海油田3000万吨持续稳产关键技术研究”(CNOOC-KJ135ZDXM36TJ)。

摘　　要：围绕渤海底水稠油油藏在特高含水阶段剩余油挖潜机理认识不清、渗流特征认识不深的难点问题,以典型河流相Q油田主力砂体为例,开展不同类型储层样品在2000 PV高倍数水驱下的极限水驱油效率实验研究。实验结果显示,在经过2000 PV高倍数水驱后,稀油、普1类稠油和普2类稠油的极限驱油效率分别为76.5%、75.5%和72.5%。在相同的高倍数水驱条件下,稀油样品驱油效率在100 PV处出现拐点,普1类稠油样品在300 PV处出现拐点,普2类稠油样品驱油效率在1000 PV处出现拐点。地层原油黏度越大,拐点出现的时机越晚,揭示水驱至残余油状态的废弃时机越晚。普2类稠油样品在100~1000 PV的高倍数驱替过程中,单位PV数下驱油效率要高于稀油样品和普1类稠油样品,在2000 PV的高倍数水驱条件下驱油效率最终可高达72.5%。实验结论可为底水稠油特高含水期大液量提液挖潜提供机理支撑。Focusing on the difficult problems of unclear understanding of the mechanism of tapping the potential of remaining oil and the seepage characteristics in the ultra-high water cut stage of the bottom water heavy oil reservoir in Bohai Oilfield,this paper takes the main sand body of typical fluvial facies in Q oilfield as an example to carry out the experimental study on the ultimate water displacement efficiency of different types of reservoir samples under 2000 PV high-multiple water displacement.The experimental results show that after high multiple water flooding at 2000 PV,the maximum displacement efficiency of thin oil,common type 1 heavy oil and common type 2 heavy oil is 76.5%,75.5%and 72.5%respectively.Under the same high-multiple water flooding conditions,the inflection point of the oil displacement efficiency of thin oil samples appeared at 100 PV,the inflection point of the common type 1 heavy oil samples appeared at 300 PV,and the common type 2 heavy oil samples appeared at1000 PV.The greater the viscosity of formation crude oil,the later the inflection point appears,and the later the abandonment time of water flooding to the residual oil state.In the high multiple displacement process of 100~1000 PV,the oil displacement efficiency per PV of the common type 2 heavy oil samples,is higher than that of thin oil samples and the common type 1 heavy oil samples.Under the high multiple water displacement condition of 2000 PV,the oil displacement efficiency can finally reach up to72.5%.The experimental results can provide mechanism support for large liquid extraction and tapping potential of heavy oil with bottom water in the ultra-high water cut stage.

关 键 词：特高含水期 极限驱油效率 剩余油挖潜 稠油油藏 

分 类 号：TE345[石油与天然气工程—油气田开发工程]