强化空气泡沫驱在W20断块的应用研究

Research and application of reinforced air-foam flooding in W20 fault block

W20断块经过多年的开发,水驱效果逐年变差,为了改善地层渗流环境,采用质量分数为0.4%HTPM-1+0.03%多糖聚合物的强化泡沫体系作为驱替介质进行提高采收率研究。室内实验结果显示,强化泡沫体系不仅具有较强的起泡和稳泡性能,抗温、抗压、抗吸附能力也达到较高水平,气液比在2∶1时,强化泡沫体系的阻力因子最高,封堵能力最强,室内驱油实验提高采收率15.46%;数值模拟软件模拟表明,采用气液同注的方式,注入量在0.18 PV时,累计产油量最高;现场注入试验表明,断块产液量上升,含水率下降,注入压力上升至1.8 MPa。

After years of development, the water flooding effect of the W20 fault block is getting worse every year. To improve the formation seepage environment, this paper employs a reinforced foam system with a concentration of 0.4% HTPM-1 + 0.03%polysaccharide polymer as the displacement medium to enhance oil recovery. Laboratory experiment results show that the reinforced foam system not only has strong foaming and foam stabilization performances but also has high-temperature resistance, compression resistance, and adsorption resistance abilities. When the gas-liquid ratio is 2:1, the resistance factor and the plugging ability of the foam system are highest, and the enhanced oil recovery(EOR) of the indoor flooding experiment increases by 15.46%. The simulation of the numerical simulation software indicates that in the gas-liquid injection method, the cumulative oil production is the highest when the injection volume is 0.18 PV. The field injection test shows that as the fluid production of the fault block rises and the water content decreases, the injection pressure grows by 1.8 MPa.