Binary Composite Flooding Injection System Optimization in Conglomerate Reservoir
After decades of water-driven development,the conglomerate reservoir in Karamay,Xinjiang,is plagued by issues such as highly dispersed residual oil and a low oil recovery rate.To create various binary composite systems,polymeric partially hydrolyzed polyacrylamide(HPAM),low tension surfactant PS-30,and strong emulsifying surfactant OP-10 were chosen.The long sand pipe model was used to investigate the application limits and recovery enhancement limits of the composite drive system in conglomerate reservoirs with varying permeability,replacement methods,and injection volumes.The experimental results show that the binary composite flooding can effectively replace residual oil,expand the wave volume,and significantly improve the recovery rate of a conglomerate reservoir.The recovery rate of compound drive is 66.31％,which is 21.85 percentage points greater than that of water flooding when the polymer concentration is 1 000 mg/L and the relative molecular mass is 7 × 106 at a permeability of 3 × 10-2 μm2.The recovery rate is improved more by the strong emulsification composite system than by the low tension composite system.The higher the injection volume of the composite system,the greater the recovery improvement,but the magnitude of the recovery improvement is not linear.After the injection volume of the composite system reaches 3.5 PV,the recovery improvement value of the composite system gradually stabilizes,and the highest recovery improvement magnitude of the composite flooding system reaches 40.38 percentage points after the injection of 10 PV.
万方数据
维普
