渤海稠油油田聚合物驱阶段注采特征研究  

Study of the performance characteristics of injection and production on different stages in polymer flooding of Bohai heavy oil field

作　　者：敖文君 阚亮 田津杰 王成胜 陈斌[1] 吴雅丽 吴彬彬 AO Wen-jun;KAN Liang;TIAN Jin-jie;WANG Cheng-sheng;CHEN Bin;WU Ya-li;WU Bin-bin(CNOOC Enertech Drilling ＆ Production Co.,Tianjin 300452,China;State Key Laboratory of Offshore Oil Exploitation,Beijing 100028,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300452 [2]海洋石油高效开发国家重点实验室,北京100028

出　　处：《陕西科技大学学报》2018年第6期98-102,共5页Journal of Shaanxi University of Science & Technology

基　　金：国家科技重大专项项目(2016ZX05025-001-003);中国海洋石油总公司科研项目(CNOOC-KJ 135KJXM NFGJ 2016-04)

摘　　要：渤海某一油田为普通稠油油田,在注聚过程中出现了产液下降过快,含水率高,产能释放困难等问题,本文利用室内物理模拟与数值模拟方法,并结合理论分析,根据目标油田的油藏特征,研究了在直接注聚,含水率分别为42%、58%以及75%时转聚时机下,聚合物驱过程中的含水率、产液指数以及采油量的变化规律,同时研究了适合目标油田最佳的开采方式.结果表明:四个注聚阶段的最终采收率分别为61.75%、59.24%、57.12%、56.44%,注聚越早采收率越高,且最低含水率值越小,水驱不同时刻转聚驱后,产液指数均下降,但注聚时机越晚,产液指数降低范围越大,且产液指数上升越晚,提早注聚,有利于降低注聚过程中产液下降过快的问题.数值模拟结果表明,注聚后,原油在油层内富集形成油墙,向边井、角井运移,使生产压差增大,产液指数降低.通过对比不同聚合注入方式,表明聚合物梯次降浓度注入,其最终的采收率比单一段塞及梯次增浓度注入分别提高4.58%、3.21%,聚合物梯次降浓度注入,对高渗层封堵效率更高,中低渗透层可以得到更好的动用.During the process of polymer flooding, problems such as excessive liquid produc tion,high moisture content and difficult release of production capacity were encountered in Bohai heavy oil field. In this paper, based on the reservoir characteristics of the target oil field,the variation law of water cut,liquid production index and oil recovery are studied,un der the conditions of direct polymer flooding, or polymer flooding with water cut of 42%, 58% and 75% respectively, through indoor physical simulation and numerical simulation method. The results showed that the final recovery rates of the four polymer injection stages were 61.75% ,59.24%,57.12% and 56.44% respectively. The earlier the polymer injection, the higher the recovery and the smaller the minimum water cut. After polymer flooding at different times ,the index of liquid production decreases, but the later the injection time is, the larger the decreasing range of the index of liquid production is, and the later the index of liq uid production rises,the earlier the injection is,which is helpful to reduce the problem of rap id decline of liquid production in the process of polymer flooding. The numerical simulation results show that after polymer injection, crude oil enriches in the reservoir and forms oil wall, migrates to side wells and angle wells, which increases the production pressure differ ence and decreases the liquid production index. By comparing different polymer injection modes, it is shown that the best polymer injection mode is step down concentration injection, and the ultimate recovery is 4.58% and 3.21% higher than that of single slug and step up concentration injection, respectively. The polymer step down concentration injection has higher plugging efficiency for high permeability layer and better utilization for medium and low permeability layer.

关 键 词：稠油油田 聚合物驱 注聚时机 产液指数 注采特征 

分 类 号：TE357[石油与天然气工程—油气田开发工程]