【摘要】 针对大多数生产井多层产液的实际情况,本文提出了一种新的计算生产油井井下温度分布的加数值模拟方法,基于流体力学和热传递理论,建立了生产油井井下温度场在柱坐标系下的二维温度场模型。该模型考虑了热传导和由于流体在地层和井眼中流动引起的对流换热,同时还考虑了由多个产层生产引起的井筒中流体速度的变化。本文构建了井筒与围岩、井筒与产层、围岩与产层之间的耦合边界条件,采用交替方向半隐式(ADI)有限差分方法求解井下温度场模型,对比用此方法计算的理论模拟曲线与实测温度曲线,计算结果与实测结果接近。理论模拟结果表明,产液量、生产时间、孔隙度、层厚以及地温梯度对井下温度分布均有影响。更多还原

【Abstract】 An improved numerical simulation method is presented to calculate the downhole temperature distribution for multiple pay zones in producing oil wells. Based on hydrodynamics and heat transfer theory, a 2-D temperature field model in cylindrical coordinates is developed. In the model, we considered general heat conduction as well as the heat convection due to fluid flow from porous formation to the borehole. We also take into account the fluid velocity variation in the wellbore due to multiple pay zones. We present coupled boundary conditions at the interfaces between the wellbore and adjacent formation, the wellbore and pay zone, and the pay zone and adjacent formation. Finally, an alternating direction implicit difference method (ADI) is used to solve the temperature model for the downhole temperature distribution. The comparison of modeled temperature curve with actual temperature log indicates that simulation result is in general quite similar to the actual temperature log. We found that the total production rate, production time, porosity, thickness of pay zones, and geothermal gradient, all have effects on the downhole temperature distribution.更多还原