吐哈盆地鄯善油田轻质油藏注空气开发机理研究

Mechanism research of air injection development in light oil reservoirs in Tu-Ha Basin.

为了探讨轻质油藏注空气提高采收率的机理,在注空气室内实验研究的基础上,运用热采数值模拟技术,研究了鄯善油田不同开发阶段注空气后油藏内原油低温氧化反应过程、相态变化规律及分布特征、油藏能量的变化规律;同时研究了油藏温度、油藏压力和空气注入速度等因素对轻质油藏注空气开发效果的影响,阐明了注空气开发的主要驱油机理,即烟道气驱和附加的热效应,对轻质油藏注空气开发矿场试验具有一定的指导作用。

In order to discuss the mechanism of air injection for enhancing oil recovery in the light oil reservoirs,laboratory experiments of the air injection were carried out. Low-temperature oxidation reaction process,phase behavior change rule and distribution characteristic, reservoir energy (temperature) change rule in oil reservoir were studied using the numerical simulation technology of thermal recovery after air injection at different development stages in Shanshan oilfield. Influences of reservoir temperature, pressure, air injection rate and other factors on development effect were also studied. Main mechanism of oil displacement in air injection re covery was clarified, that is flue gas drive and added thermal effect. It has certain guiding role on field experiments of air injection development in the light oil reservoirs.