复合调驱技术在多轮次调驱油藏的研究与应用

Study and application of compound profile control and drive technology in multi-cycle profile control and drive reservoir

针对油田多轮次弱凝胶调驱后增油效果逐渐递减的问题,研究和探讨了弱凝胶-表面活性剂复合调驱技术。在研究过程中进行了大量有关弱凝胶和表面活性剂的性能实验,实验表明,在弱凝胶调驱后进行表面活性剂驱,可以发挥二者良好的协同作用,比单独采用表面活性剂驱油提高采收率约4.45%,比单纯的弱凝胶调驱提高采收率约6.3%。在平面矛盾突出且进行过多轮次调驱的茨4块,实施该技术后,平面矛盾得到有效抑制,油井产量上升,含水下降,达到了堵水和驱油双重目的。

In view of the gradual decline of oil increasing effect after multiple rounds of weak gel flooding in oilfield,the weak gel surfactant composite profile control and flooding technology was studied and discussed.A lot of property tests on weak gel and surfactant were carried out in the research process.The experiments show that surfactant flooding after weak gel flooding can play two synergistic effects,improving oil recovery by about 4.45%compared with surfactant flooding alone,which is about 6.3%higher than that of pure gel flooding.In block Ci4,where the horizontal contradiction is prominent and too many rounds of profile control and flooding have been carried out,the horizontal contradiction is effectively suppressed,the oil well production is increased,and the water cut is decreased,thus achieving the dual purposes of water plugging and oil displacement.