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本模型是根据Coats1980年发表的火烧油层模型经改进研制的三维、三相、两组份、全隐式注蒸汽开采数值模型。考虑了以下因素:1.轻质馏分的蒸馏作用及流体流动时的携热作用;2.油层的非均质、各向异性、传热性;3.温度、压力对流体性质的影响;4.流体及油层的压缩性;5.毛管力、粘滞力、重力;6.井筒及上、下盖层的热损失等。节点序号按“红一黑”排列,形成2循环系数矩阵,求解变量个数可约简一半,有直接解法、多级循环块松弛迭代法。本模型可用于研究一、二、三维,油、汽、水三相,考虑蒸馏作用的蒸汽驱问题及柱座标单井蒸汽吞吐问题,也可计算注冷/热水驱问题。最后,与1985年SPE考题作了对比。
The model is based on the three-phase, two-phase, two-component, all-implicit steam injection numerical model developed by Coats in 1980. The following factors are considered: 1. the distillation of light fractions and the entrainment of heat when the fluid is flowing; 2. the heterogeneity, anisotropy and heat transfer of the oil layer; 3. the influence of temperature and pressure on the properties of the fluid; 4 Fluid and reservoir compressibility; 5. capillary force, viscous force, gravity; 6. wellbore and the upper and lower cover of the heat loss and so on. The node numbers are arranged in “red-black” to form a 2-cycle coefficient matrix, and the number of variables can be reduced by about half with direct solution and multi-stage cyclic relaxation algorithm. This model can be used to study one, two, three-dimensional, three-phase oil, steam and water phases, steam flooding considering distillation and single-well steam huff and puff in column coordinates. Finally, compared with the 1985 SPE exam.