吉林油田低渗复合油藏CO_2驱数值模拟研究

根据吉林油田某区块的油藏条件,运用数值模拟方法,研究了不同储层类型CO2驱油效果。数模结果显示,注水开发时,正复合储层的开发效果最好,均质储层次之,反复合储层的开发效果最差。气水交替驱时,均质储层的开发效果最好,正复合储层次之,反复合储层的开发效果最差。因此,注水开发时,要优先选择正复合储层,注入井应在低渗透区,生产井应在高渗透区;储层改造时,应尽量提高生产井附近的渗透率。交替驱开发时,要优先选择均质储层,或渗透率差异较小的储层,其次是选择正复合储层。

Study on numerical simulation of CO2 flooding in low permeability and composite reservoir in Jilin oilfield

According to certain block of Jilin oilfield, the displacement efficiency in different composite reservoirs has been studied with numerical simulation. The result of numerical simulation shows that when water drives oil, the displacement efficiency of positive composite reservoir is the highest, followed by homogeneous reservoir and inverted composite reservoir. When gas-alternating-water flooding goes, among three reservoirs, the displacement efficiency of homogeneous reservoir is the highest, followed by positive composite reservoir and inverted composite reservoir. Therefore, when water flooding develops, positive composite reservoir should be given priority. Moreover, inject wells should be in low permeability zone, while production wells should be in high permeability zone. When reservoir is stimulated, the producer should enhance the permeability near production wells. When gas-alternating-water flooding develops, homogeneous reservoir or the reservoir whose coefficient of anisotropy is lower should be given priority, followed by positive composite reservoir. These results not only play a very important role in plot optimization and reservoir stimulation also provide theoretical basis for field implementation of CO2 flooding.