基于动态反演的“双高”油田驱油效率研究及挖潜实践  

Study on oil displacement efficiency of high recovery and high water cutoilfield based on dynamic inversion and its potential tapping practice

作　　者：张鹏 葛丽珍 张烈 张俊廷 张国浩 ZHANG Peng;GE Lizhen;ZHANG Lie;ZHANG Junting;ZHANG Guohao(Department of Exploration&Development,CNOOC China Limited,Beijing 100010,China;Bohai Petroleum Research Institute,Tianjin Branch of CNOOC Ltd.,Tianjin 300452,China)

机构地区：[1]中海石油(中国)有限公司勘探开发部,北京100010 [2]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300452

出　　处：《非常规油气》2024年第3期91-98,共8页Unconventional Oil & Gas

基　　金：国家“十三五”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)。

摘　　要：“双高”开发阶段油田水淹程度强,剩余油呈现整体分散、局部富集的分布特点,开展剩余油潜力精准评价对该阶段调整挖潜意义重大。以矿场实际生产数据为基础,在极限驱油效率室内试验认识的基础上,综合考虑矿场典型井网模式、水淹厚度、采出程度和含水率等因素,建立矿场级别下极限驱油效率动态反演数学模型,定量计算典型井网模式极限驱油效率。研究结果表明:1)原油黏度不同,驱油效率有差异,原油黏度为50 mPa·s时,驱油效率可达68%,原油黏度为300 mPa·s时,驱油效率可达62%;2)井网模式不同,驱油效率变化规律差异较大,结合SZ油田开发实际,定向井网极限驱油效率可达48%,水平井-定向井联合井网驱油效率可达61%~68%。SZ油田驱油效率仍有大幅提高空间,后续可通过调整井网进一步提高驱油效率。该研究成果考虑黏度差异的影响,定量评价高含水期油田井网调整对提高驱油效率的影响,为SZ油田潜力评价提供了指导,同时也为其他相同开发阶段油田提供借鉴。The remaining oil presents the distribution characteristics of overall dispersion and local enrichment in the strongly waterflooded oilfield at the high recovery and high water cut development stage.The accurate evaluation of the remaining oil potential is of great significance to the adjustment and tapping of remaining oil at this stage.Based on the actual production data of the field and the indoor experimental understanding of the ultimate oil displacement efficiency,a dynamic inversion mathematical model for the ultimate oil displacement efficiency at the mine level was constructed by comprehensively considering factors such as typical well pattern,waterflooded thickness,recovery,and water cut in the field.The ultimate oil displacement efficiency of the typical well pattern is quantitatively calculated.The research results indicate that:1)The oil displacement efficiency varies with the oil viscosity.The oil displacement efficiency can reach 68%when the oil viscosity is 50 mPa·s,and the oil displacement efficiency can reach 62%when the viscosity of crude oil is 300 mPa·s;2)The variation laws of oil displacement efficiency vary significantly depending on different well patterns.Based on the actual development of SZ oilfield,the ultimate oil displacement efficiency of directional well pattern can reach 48%,and the oil displacement efficiency of well pattern of horizontal well directional well combination can reach 61%~68%.The oil displacement efficiency could be significantly increased in SZ oilfield based on the evaluation method of remaining oil potential in this paper.In the future,the oil displacement efficiency can be further improved by adjusting the well pattern.This research achievement considers the impact of viscosity differences and quantitatively evaluates the impact of well pattern adjustment on improving oil displacement efficiency in high water cut oilfields.It provides guidance for the potential evaluation of SZ oilfield and also provides a reference for other oilfields in the same development

关 键 词：“双高”开发阶段 动态反演 驱油效率 调整挖潜 渤海油田 

分 类 号：TE122[石油与天然气工程—油气勘探]