摘要
为探讨两相流体渗流时的启动压力变化规律,对天然岩心进行水驱油和气驱油实验,计算出各自的相对渗透率,然后按单相启动压力梯度公式推算出相对启动压力梯度,绘制油水、油气相渗曲线。研究结果表明,在两相启动压力曲线上,各相的启动压力梯度与驱替相的饱和度之间均呈指数变化规律;气驱、水驱后期指数变化规律遭到破坏,是驱替后期驱油效率急剧变小的主要原因。
To research the performance of starting pressure for two-phase (oil-water or oil-gas) flow, experiments of water driving oil and gas driving oil are done on natural cores, each relative permeability is worked out, the relative starting pressure gradients are calculated according to single-phase starting pressure gradient formula, and then the oil-water and oil-gas permeability curves are derived. The two-phase starting pressure curves reveal exponential relationship between the starting pressure gradient and the saturation of the driving phase. And the relationship is damaged in the late gas driving and water driving period, which is the main reason for the rapid decrease of the displacement efficiency in the late driving stage.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2004年第3期110-112,共3页
Petroleum Exploration and Development
关键词
两相启动压力
关系曲线
相对启动压力梯度
指数变化规律
驱替特征
two-phase starting pressure
relationship curve
relative starting pressure gradient
exponential relationship
displacement performance
