裂缝性气藏三维二相全隐式数值模拟与底水锥进分析

TWO PHASES AND THREE DIMENSIONS IMPLICIT SIMULATION AND BOTTOM WATER CONING ANALYSIS FOR FRACTURE RESERVOIRS

采用全隐式模拟方法研究了裂缝性气藏三维气水两相数值模拟问题，采用最佳交点松弛法求解全隐式模拟差分方程，并通过理论气藏的计算，分析了影响裂缝性气藏底水锥进的主要因素。全隐式模拟方法在解决高速渗流、井点压降变化大、饱和度变化大等问题时具有优越性；造成裂缝性底水气藏开采过程中底水锥进的主要原因是射孔层段及单井产量的控制，其中射孔层段的控制尤为重要。射孔层段越靠近底水层，底水锥进越严重；单井产量过高，易诱发底水锥进。因此，在编制该类型气藏的开发方案时，应根据底水情况，进行射孔层段及单井产量的优选。

he simulation problem of two phases and three dimensions impliclit model for fracture reservoirs is discussed. Implicit simulation difference equation is solved by optimal point relaxation method. Therough theoretically computing, the main factors of effecting bottom water coning of fracture reservoirs are analysed. The implicit simulation method is advantageous to solving coning problems of high speed permeating fluid, great pressure drop aroundwell and great saturation change. The major subject of bottom water coning during fracture reservoir development is how to control Perforated interval and single well production. The more Perforated interval nears bottom water zone,the more the water cones seriously. When making the development program for this kind of gas reservoirs, the optimization of Perporated zone and single well production should be done according the conditions of bottom water.