低渗非均质性油藏CO_2驱油特征研究  

STUDY ON DISPLACEMENT CHARACTERISTICS IN CO_2 FLOODING FOR LOW PERMEABILITY HETEROGENEOUS RESERVOIRS

作　　者：王锐[1] 倪红[2] 吕成远[1] 伦增珉[1] 韩封 

机构地区：[1]中国石化石油勘探开发研究院采收率所 [2]金陵科技学院建筑工程学院 [3]胜利油田河口采油厂工艺研究所

出　　处：《钻采工艺》2011年第3期88-90,118,共3页Drilling & Production Technology

基　　金："中国博士后科学基金资助项目";国家"973"计划(2006CB705805)"CO2驱替过程中多相多组分非线性渗流机理和规律"部分研究内容

摘　　要：应用并联岩心模拟油藏纵向非均质性,比较了低渗非均质岩心中水驱与CO2驱替特征,在非均质岩心中CO2渗流实验的基础上,进行了CO2驱油实验。实验结果表明,CO2驱能启动低渗层中水驱没有波及到的原油。随着压差的增大,高渗层内气体流量比逐步减小,低渗层内的气体流量比逐步增大。气驱油过程中,随着气体驱替压差的增大,高渗层产油量比逐步减小,低渗层产油量比逐步增大。驱替压差的增大有利于启动低渗层原油,提高低渗非均质油藏采收率。Through the simulation on heterogeneity by parallel core experiments, displacement characteristics of waterflooding and CO2 flooding in low permeability heterogeneous reservoirs were compared. Based on the experiments on CO2 flowrate distribution, CO2 injection in the reservoir was investigated. The results showed that C02 flooding could start the crude oil in low permeability layers that could't be swept by waterflooding. The flowrate ratio in low permeability layers increases with increase of pressure difference between two ends of cores,and the flowrate ratio in high permeability layers decreases with increase of pressure difference.In the process of gas driving oil,with the increase of gas drive pressure difference, the oil-producing capacity was reduced in high permeability layers and increased in low permeability layers. The increase in pressure difference could improve the oil recovery of low low permeability heterogeneous reservoirs.

关 键 词：低渗透 非均质性 CO2驱 流量分布 水驱 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]