非均质油藏化学驱波及效率和驱替效率的作用  

Effects of oil displacement efficiency and conformance efficiency of chemical flooding in heterogeneous reservoirs

作　　者：沈平平[1] 袁士义[1] 邓宝荣[1] 宋杰[1] 沈奎友[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《石油学报》2004年第5期54-59,共6页Acta Petrolei Sinica

基　　金：国家重点基础研究项目 (G1 9990 2 2 51 2 )部分成果

摘　　要：利用我国自行研制的ASP数值模拟软件及正韵律二维剖面地质模型 ,分别模拟了水驱、聚合物驱、三元复合驱的驱油过程 ,分层计算了采收率、剩余油饱和度、波及效率和驱替效率 ,进行了指标对比。研究结果表明 ,对于非均质性严重的油藏 ,不同层段的波及效率和驱替效率所起的作用不同。在高渗透层段 ,以提高驱替效率为主 ;在低渗透层段 ,以提高波及效率为主 ;在中等渗透层段 ,提高波及效率和提高驱替效率作用相当。由于水驱后 ,剩余油大部分集中在上部 ,低渗透层段是提高采收率的主要潜力层段 ,提高上部低渗透层段的波及效率对于提高总体采收率具有重要的作用。对于非均质性严重的油藏 ,先调剖再注三元复合体系段塞 。Oil displacement processes of water flooding, polymer flooding and alkali-surfactant-polymer (ASP) flooding were simulated respectively by the use of heterogeneous normal rhythm 2D section geologic model and chemical simulator ASP 2.0 developed by our country. The effects of oil displacement efficiency and sweep efficiency of every layer were investigated. Many index parameters were compared. The study results show that the displacement efficiency and sweep efficiency play different roles in the different layers. The displacement efficiency primarily contributes to the most permeable zones, and the sweep efficiency primarily contributes to the lowest permeable zones. Both displacement efficiency and sweep efficiency contribute to the medium zones. After water flooding, the residual oil saturation in very low-permeability zone is still high. The improvement of the recovery in the low-permeability zone is significant for enhancing the ultimate recovery of the reservoir. For highly heterogeneous reservoirs, chemical flooding after profile control is an important way for improving oil displacement effectiveness.

关 键 词：非均质油藏 化学驱 驱替效率 波及效率 提高采收率 

分 类 号：TE357.43[石油与天然气工程—油气田开发工程]