基于数字岩心的海上砂砾岩油藏提高采收率研究  

Study on enhanced oil recovery of offshore glutenite reservoir based on digital cores

作　　者：黄琴 桑丹 张俊 张占华 王雨 HUANG Qin;SANG Dan;ZHANG Jun;Zhang Zhanhua;Wang Yu(Tianjin Branch of CNOOC(China)Limited,Tianjin 300450,China;Enter Tech-Drilling&Production Co.,CNOOC Energy Development Co.,Ltd.,Tianjin 300452,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300450 [2]中海油能源发展股份有限公司工程技术分公司,天津300452

出　　处：《复杂油气藏》2024年第2期208-216,共9页Complex Hydrocarbon Reservoirs

基　　金：国家科技重大专项课题“渤海油田高效开发示范工程”(2016ZX05058)。

摘　　要：海上砂砾岩油藏岩心收获率低,岩心品质差,难以开展常规岩心实验研究。为了分析旅大29油田砂砾岩油藏储层孔隙结构分布与油水相渗特征,采用数字岩心分析技术,建立三维数字岩心模型,并在此基础上开展岩心静态孔隙特征描述、油水渗流规律及微观剩余油分布研究。研究表明:旅大29油田砂砾岩油藏在水驱油初期微观剩余油主要分布于狭窄吼道处以及小孔隙中,水驱油末期以不连续的点状或者斑状分布于岩样死角、孔隙盲端及渗流阻力相对较大的微小孔隙和吼道中;含水变化规律整体呈现初期见水晚、含水上升速度慢,中后期含水上升速度快的特点。建议旅大29油田应适时转注水开发,在开发过程中采取控水措施,减缓含水上升速度,采用高性能驱油体系挖潜零散分布的剩余油,从而改善驱替效果,提高采收率。The core recovery rate of offshore glutenite reservoirs is low,and the core quality is poor,so conducting conventional core experimental research is challenging.In order to analyze the pore structure distribution and oil-water phase permeability characteristics of the glutenite reservoirs in Lyuda 29 Oilfield,a three-dimensional digital core model was established using the digital core analysis technology.Based on this study,the static pore characteristics of the core,oil-water seepage law,and the distribution of microscopic remaining oil were studied.The results show that in the early stage of water flooding in the glutenite reservoirs of the Lyuda 29 Oilfield,the microscopic residual oil is mainly distributed in the narrow channel and small pores;in the late stage of water-driven oil,it is distributed in the dead corner of the rock samples,the blind end of the pore space,and the small pores and channels which have relatively large seepage resistance in the discontinuous spots or porphyritic form.The change of water cut shows the characteristics of late water-cut in the early stage,slow water-cut rising rate,and fast water-cut rising rate in the middle and late stages.It is suggested that the Lyuda 29 Oilfield should be transformed into water injection in time,taking water control measures during the development process to slow down the rising rate of water-cut,and adopting a high-performance flooding system to exploit potential scattered residual oil,to improve the displacement effect and enhanced oil recovery(EOR).

关 键 词：数字岩心 孔隙特征 岩心驱替 油水相渗曲线 剩余油分布 

分 类 号：TE53[石油与天然气工程—油气田开发工程]