地热能自平衡加热采油过程数值模拟

Numerical Simulation of the Heating Oil Recovery Process with the Method of the Earth Thermal Energy Self-Balance

根据华北油田楚32井的实验测试数据,采用热平衡方程、有限差分法和数值模拟方法研究了采油过程中地热能自平衡加热效果,计算了不同产液量和不同泵挂深度时井口出液温度的变化.计算结果表明,用空心抽油杆密封连接而制成的超长重力热管,依靠地热能自平衡加热井筒内流体效果明显,井口出液温度随油井产液量和泵挂深度的增加而升高,且基本上呈线性变化.地热能自平衡加热原油的方式适合于产液量大的深井.

According to the experimental data in well CHU 32 of the Huabei Oilfield, the heating oil effect with the method of the earth thermal energy self-balance in the oil production process is numerically simulated with the finite difference method and thermal balance equations. The temperature variety at oil outlet is computed when the production and the depth of oil pump are different. The results indicate that the effect is obvious by using the earth thermal energy self-balance method to heat the liquid in the pipe with the super long two-phase closed thermosyphon consisting of the hollow sucker rod. The oil temperature at the well outlet increases with the enhancement of the oil production and the depth of oil pump, and is basically linear with them. The method of heating oil with the earth thermal energy self-balance is suitable for the deep oil wells with large production.