渤海L油田储层韵律性对聚驱剩余油分布影响研究  

Influence of Formation Rhythm on Remaining Oil Distribution of Polymer Flooding in Bohai L Oilfield

作　　者：刘斌 周海燕 张伟 王刚 岳宝林 LIU Bin;ZHOU Hai-yan;ZHANG Wei;WANG Gang;YUE Bao-lin(CNOOC Tianjin Branch, Tianjin 300459, China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《承德石油高等专科学校学报》2022年第1期7-12,19,共7页Journal of Chengde Petroleum College

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。

摘　　要：渤海L油田是典型厚油层油藏,由于储层非均质性严重,并伴随早期注聚,在开发过程中存在明显指进和舌进现象,导致部分井含水突升,生产效果变差。为解决此问题,开展室内实验研究储层韵律性对油田开发及剩余油分布规律的影响。研究表明:对于不同韵律性模型,非均质性越强,见水时间越早。对于早期注聚后含水下降幅度,均质韵律、反韵律和复合正反韵律的含水下降幅度较大,而正韵律和复合反正韵律下降幅度较小;在纵向上,剩余油主要富集在高部位和低渗层,高部位以正韵律、复合正韵律、复合正反韵律为主,低渗层主要以复合正反韵律、复合反正韵律为主。开发结束,复合正反韵律纵向波及较低,其它韵律性较高。Bohai L oilfield is a typical oil reservoir with thick formation.Due to the serious reservoir heterogeneity and early polymer injection,fingering and tongue advance problems are obvious in the development process,which leads to the increase of water cut and poor production effect in some production wells.The influence of formation rhythm on oilfield development and remaining oil distribution is studied through laboratory experiments.Results show that for different rhythm models,the stronger the heterogeneity is,the earlier the water breakthrough becomes.For the decrease range of water cut after early polymer injection,the decrease range of water cut of homogeneous rhythm,reverse rhythm and compound positive and negative rhythm is larger,while the decrease range of positive rhythm and compound negative and positive rhythm is smaller.The remaining oil is mainly distributed in high part and low permeability layer vertically.The high part is dominated by positive rhythm,compound positive rhythm and compound positive and negative rhythm,while the low permeability layer is dominated by compound positive and negative rhythm and compound negative and positive rhythm.At the end of development,the vertical sweep efficiency of compound positive and negative rhythm is lower,and the vertical sweep efficiency of other rhythm is higher.

关 键 词：渤海L油田 储层韵律性 递减率 剩余油分布 矿场应用 

分 类 号：TE327[石油与天然气工程—油气田开发工程]