利用油气势能预测油藏开发后期剩余油富集区

流体势是控制地下流体运动的直接因素。已开发油藏中油气主要受到重力、浮力、毛细管力以及生产压力4种应力,形成了位能、压力能、界面势能以及动能4类流体势能。分析了每种流体势能对已开发油藏流体运动的控制作用,明确了油气势能与剩余油富集区之间的关系:油藏开发中后期的油气低势区是剩余油富集的有利区域,而油气高势区则是易于水淹的区域。研究结果在高尚堡油田高浅南区油藏的剩余油预测中取得了很好的应用效果。

Predict residual oil zones in the late life of oilfield development by hydrocarbon potential

Fluid potential is a direct factor controlling formation fluid movement.In developed reservoirs,hydrocarbon mainly subjects to 4 types of forces including gravity,buoyancy,capillary force and producing pressure,thus formed 4 types of fluid potentials such as potential energy,pressure energy,interfacial potential and kinetic energy.This paper analyzes the control action of each type of fluid potential on reservoir fluid motion,and describes the relationship between hydrocarbon potential and residual oil enriched zones.In the late life of oilfield development,the low potential zones are favorable zones of residual oil,while the high potential zones are likely to be watered out.The study result has been applied in prediction of residual oil enriched zone in the Gaoqiannan reservoir in the Gaoshangpu oilfield and has achieved satisfactory effect.