烃类气驱油效率影响因素实验研究?

为了研究压力、原油含气性质、烃类气体组成和气体注入方式对烃类气驱油效率的影响,分别利用细管和长岩心模型进行了不同实验条件下的气驱油实验。结果表明:随压力的升高,烃类气驱突破点驱油效率和总驱油效率均增大,且气体突破后高含气采油阶段提高驱油效率幅度逐渐减小,即压力越高气体突破后提高驱油效率幅度越小;随原油初始含气量的增大,烃类气驱突破点驱油效率和总驱油效率均减小,即原油初始含气量越高,烃类气驱油效率越低;随烃类气体中丙烷含量的增加,突破点驱油效率和总驱油效率均明显增大;均质模型中,水驱后烃类气水气交替驱油效率与水驱后连续注气相近,注入方式对烃类气驱油效率影响较小。

The Experimental Research of Influencing Factors on Oil Displacement Efficiency during the Hydrocarbon Gas Flooding

In order to study the influence of pressure, original oil-gas ratio, hydrocarbon gas composition and gas injection method on displacement efficiency, hydrocarbon gas displacement experiments under different conditions were conducted through slim tube model and long core model respectively. The results show that: the breakthrough displacement efficiency and total displacement efficiency both increase with the increase of pressure and the improvement of displacement efficiency after gas breakthrough reduces gradually. The higher the original oil-gas ratio is, the lower the displacement efficiency will be. The hydrocarbon gas composition can significantly affect the displacement efficiency. The increase of propane content can raise both breakthrough displacement efficiency and total displacement efficiency. In homogenous model, the displacement efficiency of WAG injection after water flooding is close to that of continuous injection, which indicates injection method has little influence on displacement efficiency.