特高含水整装油田不同级次水驱带划分标准与体积计算方法  

Classification criteria and volume calculation method for different graded waterflooding zones of uncompartmentalized oilfields at ultra-high water cut stage

作　　者：王增林[1] 张贵才[2] 靳彦欣[1] 裴海华[2] 史树彬[1] 蒋平[2] WANG Zenglin;ZHANG Guicai;JIN Yanxin;PEI Haihua;SHI Shubin;JIANG Ping(Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257000,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao City,Shandong Province,266580,China)

机构地区：[1]中国石化胜利油田分公司,山东东营257000 [2]中国石油大学(华东)石油工程学院,山东青岛266580

出　　处：《油气地质与采收率》2022年第5期75-82,共8页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项“胜利油田特高含水期提高采收率技术”(2016ZX05011-004);中国石化“十条龙”项目“胜利整装油田特高含水期深度堵调技术”(217007)。

摘　　要：胜利油区主力整装油田经过长期注水开发,已进入注水开发后期,其综合含水率超过98%,但采收率仅为41%,仍具有较大剩余油储量和提高采收率潜力。通过对胜利整装油田取心井岩心分析,发现各整装油田特高含水期均出现了剩余油饱和度小于残余油饱和度的极端水洗井段,同时也存在含油饱和度大于水驱前缘含油饱和度的弱水驱井段。提出了特高含水储层极端水洗带、强水淹带和弱水驱带的定义和划分标准。研究注入量、驱替速度和渗透率等因素对极端水洗带形成的影响,结果表明,随着注入量的增加,注入水优先突破的区域中,含油饱和度逐步降低、水相渗透率逐步增大、注水分流量逐步提高、驱替速度逐步上升,导致该区域剩余油饱和度低于残余油饱和度,从而形成极端水洗带。建立了不同级次水驱带体积计算方法,并用孤东、孤岛和埕东3个整装油田生产动态数据进行了验证计算,证明所建立的方法是科学、准确的,且具有需要数据易得和计算简单的优势。The main uncompartmentalized oilfields in Shengli Petroleum Province have entered the late waterflooding stage after long-term development.Their comprehensive water cut has reached more than 98%,but the recovery rate is only 41%,and thus the oilfields still have large residual oil reserves and enhanced oil recovery(EOR)potential.Through the core analysis of cored wells in uncompartmentalized oilfields,it was found that in the ultra-high water cut stage,there were extreme waterflooding intervals with the saturation of remaining oil less than that of residual oil as well as weak waterflood⁃ing intervals with the oil saturation greater than the oil saturation of waterflood front in all uncompartmentalized oilfields.Therefore,this paper proposed the definition and classification criteria of the extreme waterflooding zone,strong waterflood⁃ing zone,and weak waterflooding zone of an ultra-high water cut reservoirs.The influence of water injection,displacement rate,and permeability on the formation of the extreme waterflooding zone was studied.The research results reveal that with the increase in injected water volume,in the priority breakthrough area of the injected water,oil saturation gradually de⁃creases with the gradual rise in water phase permeability,water fractional flow,and displacement rate.As a result,the re⁃maining oil saturation in this area is lower than the residual oil remaining oil saturation,and thus the extreme waterflooding zone is formed.The volume calculation method for different graded waterflooding zones was established,and the dynamic production data of Gudong,Gudao,and Chengdong oilfields were used to verify the calculation.It is proved that the estab⁃lished method is scientific and accurate and has the advantage of easy access to required data and simple calculations.

关 键 词：不同级次水驱带 特高含水期 岩心分析 剩余油饱和度 提高采收率 

分 类 号：TE327[石油与天然气工程—油气田开发工程]