启动压力梯度对稠油油藏开发指标的影响  

Influence of threshold pressure gradient on development indicators in heavy oil

作　　者：柯文丽 张文艳 郭伟泽 喻高明[1] KE Weni;ZHANG Wenyan;GUO Weize;YU Gaoming(Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering(Yangtze University),Wuhan 430100,China)

机构地区：[1]油气钻采工程湖北省重点实验室(长江大学),武汉430100

出　　处：《中国科技论文》2024年第3期390-398,共9页China Sciencepaper

基　　金：“十三五”国家重大科技专项(2016ZX05025001)。

摘　　要：稠油启动压力梯度的存在加剧了稠油渗流的阻力,为稠油开发造成了一定困难。针对该问题,利用NRSNL非线性渗流模拟软件建立机理模型,研究稠油油藏在不同韵律、渗透率级差和原油黏度条件下启动压力梯度存在与否对剩余油分布、含水率、采出程度等开发指标的影响。结果表明:启动压力梯度的存在会降低油藏采出程度,油井含水率上升较快,开采20年,采出程度降低1.72%~3.09%,含水上升1.31%~2.78%;相同启动压力梯度条件下,反韵律储层采出程度低于正韵律与复合韵律;原油黏度越大、渗透率级差越大,启动压力梯度对采出程度的影响越大。The existence of the starting pressure gradient of heavy oil aggravates the resistance of heavy oil seepage,which causes certain difficulties in the development of heavy oil.In order to solve this problem,a mechanistic model was constructed using the NRSNL non-linear flow simulation software to investigate the effects of the presence or absence of threshold pressure gradient on residual oil distribution and water saturation under different reservoir rhythms,permeability ratio,and crude oil viscosities.The research findings demonstrate that the presence of the threshold pressure gradient reduces the extent of oil recovery and accelerates water breakthrough in the wells.After 20 years of exploitation,the recovery rate decreases by 1.72% to 3.09%,and the water con⁃tent increases by 1.31% to 2.78%.Under the same initial pressure gradient conditions,the recovery efficiency of anti-rhythmic res⁃ervoirs is lower than that of rhythmic and compound rhythmic reservoirs.When the viscosity of crude oil and the permeability ratio are larger,the impact of the initial pressure gradient on the recovery efficiency is greater.

关 键 词：稠油启动压力梯度 剩余油分布 韵律 渗透率级差 原油黏度 

分 类 号：TE345[石油与天然气工程—油气田开发工程]