隔井脉冲注水在提高油田采收率方面的应用

Pulse Water Injection Technique in Interval Wells to Increase Reservoir Recovery

曾祥平,陈　辉,薛文河

Zeng Xiangping,Chen Hui,Xue Wenhe

胜利石油管理局孤岛采油厂,胜利石油管理局机关

Gudao Oil Production Company , Shengli Petroleum Administ ration Bureau , Shandong 257062 , P. R. China

进入水驱后期,开采油田的剩余油高度分散,分流线和主流线的剩余油饱和度存在明显差别,运用水动力学方法不断改变渗流场的流线分布是提高采收率的有效途径。常规脉冲注水(周期注水) 显示了良好的运用前景,但是最佳参数难以把握,停注比过大引起地层能量过分下降,反而导致降水降液不增油,达不到预期的效果。基于这一认识,本文提出线状注水,开展隔井脉冲注水提高采收率的新方法,即在隔井停注期间,邻井提水,确保稳定地层能量的基础上调整流线分布以达到提高采收率的目的。该方法在孤岛油田南区渤19 块试验两年来已取得了较好的降水增油效果,阶段含水比试验前下降1. 3 % ,累积增油1. 9 ×10⁴ t ,水驱采收率提高5. 8 %。

The distribution of remaining oil is highly dispersive at the late period of water injection ,and obvious differences of remaining oil saturation between the dividual stream line and the main are exists , so the continuous changes of the distribution patterns of water st ream lines with hydrodynamics is the effective approach to increase the reservoir recovery. Although the conventional pulse water injection has the obvious prospect in the future ,the optimum parameters are difficult to obtain. The big ration of temporarily out of service to water injection may cause the great decreasement of formation energy ,leading to the decreasing of water and fluid ,but no increasing of oil production , so the predicated object s can’t be achieved. Based on the above conditions , this paper present s pulse water injection in interval wells with streamline pattern to increase the reservoir recovery ,that is ,during the shut-down in the interval wells ,the adjoining well’s water are extracted to ensure the formation energy ,and adjustment of stream line distribution to increase the reservoir recovery. After application in the oil field , good results are got in Block 19 in the south of Gudao Oilfield since two years. The interim water cut is lower 1. 3 % than before ,the accumulated oil production is 1. 9×104 t ,and the water injection recovery is increased 5. 8 %.