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应用数值模拟方法 ,计算了低渗透油田压裂前后水驱和溶解气驱的采出程度 ;分析了溶解气油体积比、饱和压力、井底流压、裂缝方位、缝长、裂缝渗透率对开发效果的影响 .结果表明 :油田开采时间越长 ,溶解气油体积比越大 ,采出程度越高 ;而流压、油层饱和压力高低都会影响采出程度 ;当裂缝方位与井位成 45°角时 ,无论水驱还是溶解气驱 ,采出程度均提高 ,压裂后的开发效果好于压裂前 ;当人工裂缝与井位平行时 ,随着油层渗透率增大 ,气驱的采出程度增大 ,而水驱采出程度降低 .
The numerical simulation method was used to calculate the production of water flooding and dissolved gas flooding in low permeability oilfield before and after fracturing. The effects of dissolved gas volume ratio, saturated pressure, bottomhole flow pressure, fracture orientation, seam length and fracture permeability were analyzed. The results show that the longer the oilfield mining time is, the larger the dissolved gas-oil volume ratio is, and the higher the recovery rate is. However, the flow pressure and the saturation pressure of oil layer will affect the recovery degree. When the fracture orientation is 45 ° When the angle is equal to or greater than the well position, the fractured reservoir will have a higher degree of recovery than that before fracturing. When the artificial fracture is parallel to the well location, as the permeability of the reservoir increases, The degree of increase, while the degree of water-driven mining to reduce.