温度对浅层超稠油油藏启动压力梯度及相对渗透率曲线的影响  

Influence of temperature on the threshold pressure gradient and relative permeability curve of shallow super heavy oil reservoir

作　　者：马波[1] MA Bo(Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257001,China)

机构地区：[1]中国石化胜利油田分公司,山东东营257001

出　　处：《油气地质与采收率》2018年第3期101-106,共6页Petroleum Geology and Recovery Efficiency

摘　　要：目前大多数相对渗透率测试是在原始油藏温度下完成,代表性较差。为明确浅层超稠油油藏水驱过程中的流体流动机理,进行岩心驱替实验,对不同温度下的启动压力梯度和水驱浅层超稠油的相对渗透率曲线进行研究。结果表明启动压力梯度受温度影响较大,在浅层超稠油油藏相对渗透率曲线中,油相相对渗透率曲线和水相相对渗透率曲线差异很大,油相下降速度快,水相上升速度很慢。随温度升高,油水两相相对渗透率增大,等渗点右移,等渗点处的相对渗透率逐渐增大,束缚水饱和度增加,残余油饱和度降低。140和180℃时蒸汽驱油效率分别高于同等条件下的水驱效率10.6%和11.9%,在一定程度上说明热水驱替可改善浅层超稠油油藏的开发效果。At present,most relative permeability curves are achieved at room temperature with inadequate representativeness.In order to know the flow mechanism during water flooding in the shallow super heavy oil reservoir,core displacement experiment was carried out to study the relative permeability curves of the water flooding in the shallow super heavy oil and threshold pressure gradient at different temperatures.The results show that the temperature has great influence on the threshold pressure gradient.The oil phase permeability curve and the water phase permeability curve are very different,and the oil phase descends rapidly and the water phase ascends slowly.With the increase of temperature,oil-water two phase relative permeability increases and the isotonic point moves to the right,and the relative permeability at the isotonic point increases gradually;the irreducible water saturation increases,and the residual oil saturation decreases.The oil displacement efficiency by steam flooding at the temperature of140and180℃is higher than that by water flooding,which are10.6%and11.9%,respectively.To a certain extent,it shows that the hot water flooding can increase the development efficiency of the super heavy oil reservoir.

关 键 词：浅层超稠油 启动压力 相对渗透率曲线 提高采收率 温度 

分 类 号：TE345[石油与天然气工程—油气田开发工程]