稠油吞吐中加热半径计算方法及参数的确定

The Calculation of Heating Radius and Determination of Parameters in Heavy Oil Steam Stimulation

摘要: 在稠油吞吐过程中，加热半径是热采中的重要指标，对注汽参数和生产制度起到了指导性作用。运用能量守恒原理，从热量注入方面考虑了蒸汽相变释放的气化潜热，从热量损失方面考虑井筒热量损失和顶底盖层热量损失，最终得到了新的加热半径计算公式。计算结果表明，加热半径受注汽参数、焖井时间、储层参数等因素影响，并系统阐述了岩层各物性参数的计算及选择方法。最后通过实例验证了该方法的计算值和试井解释出的值较为相符，为现场实际应用提供了可靠的方法。

Abstract: Heating radius was an important index in the thermal recovery process of heavy oil steam stimulation. It was the guidance for the selection of steam stimulation parameters and production system. The vaporization latent heat of steam phase changes in terms of heat injection and heat losses on the wellbore and of the caprock on the top and the bottom were taken into consideration based on the principle of heat conservation; a new calculation formula of heating radius was established. The calculation result shows that the heating radius is affected by steam injection parameters, soak time, reservoir parameters and other factors. At the same time, the calculation and selection of the physical parameters of rock strata are systematically expounded. The method is finally verified with representative examples, the calculated value is in good agreement with that of well testing interpretation, and it provides a reliable method for the practical application in oilfields.