用物理模型研究单井电热油藏的温度分布

PHYSICAL MODEL STUDY ON TEMPERATURE FIELDS OF OIL RESERVOIR WITH SINGLE-WELL ELECTRICAL HEATING

根据相似理论建立了三维物理模型,采用按比例物理模拟方法,在不同条件下研究了单井电热油藏采油过程中油藏温度分布规律,详细介绍了物理模型的制作工艺和物理模拟实验技术。实验结果表明:①电热油藏能够在油藏中建立起稳定的温度分布,有效地提高油藏温度;②电热油藏以加热近井地带为主,油藏温度沿井筒径向距离近似地成指数规律衰减;③边加热边采油时输入电能利用率与油藏温度升高和产油速率之间存在着一个最佳匹配关系;④加热油藏的电功率有一个最佳的取值范围,一般情况下不超过50kW。

A 3-dimension physical model was set up based on the similitude theory and applied to study the temperature fields of the oil reservoir with single -well electrical heating in different conditions. And the model processing and the experimental technique of scaled physical modeling were described in detail. The experimental results show: ① the steady distribution of temperature is generated in the oil reservoir with electrical heating and the reservoir temperature is increased obviously, ② the effective increase of the reservoir temperature produced by the electrical heating is mainly limited around the well bore, ③ there is a optimum relation among the parameters, the efficiency of the electrical heating, temperature increases and oil flows rate, and ④ the electrical power of heating oil reservoir has an effect on the electrical heating efficiency, which decreases when it is above 50 kW.