启动压力对低渗透油藏无因次采油采液指数的影响及应用研究

建立考虑启动压力的低渗透数学模型,计算出无因次采油采液指数和含水率关系曲线,应用于实际区块中,分析其开发效果。结果表明:低渗透油藏考虑启动压力采液指数,甚至部分低渗透油藏在中高含水期(含水大于50%)具有一定的提液潜力。低渗透油藏无因次采液指数分为两类:第一类无因次采液指数随含水率的上升而递减,在含水率超过40%后变得平缓;第二类无因次采液指数随含水率的上升先减小而后又略有增大。

Study of Starting Pressure Affecting Non-Dimensional Oil and Fluid Production Index of Low-Permeability Reservoir in Application

Low-permeability mathematical model along with starting pressure has been estabhshed, and wire the help of it, non-dimensional oil and fluid index and water content history have been worked out. Analy sis of development effect shows that the fluid production index with starting pressure is higher than that without starting pressure in low-permeability reservoir and even part of low-permeability reservoir is likely to increase fluid production in mid to high water-cut period（50% higher）. Non-dimensional fluid production index has two types. The index of the first type decreases progressively along with the increase of water content and becomes gentle when water content is higher than 40%, and the second decreases first a- long with increase of water content and then increases slightly.