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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。
Aiming at the actual situation of multi-layer production fluid in most production wells, this paper presents a new numerical simulation method for calculating the temperature distribution in production wells. Based on fluid mechanics and heat transfer theory, Department of the two-dimensional temperature field model. The model accounts for heat conduction and convective heat transfer due to fluid flow in the formation and boreholes, as well as changes in fluid velocity in the wellbore caused by multiple pay zones. In this paper, the coupling boundary conditions between wellbore and surrounding rock, wellbore and pay zone, surrounding rock and pay zone are constructed. The underground direction temperature field model is solved by the semi-implicit alternating direction (ADI) finite difference method. Comparing the theory calculated by this method Simulation curve and measured temperature curve, the calculated results and the measured results are close. Theoretical simulation results show that fluid production, production time, porosity, thickness and geothermal gradient have an impact on downhole temperature distribution.