低频脉冲波对储层岩心渗流特性影响规律研究

低频脉冲波增产技术是一种新的提高采收率的方法.采用自行设计的振动采油装置,通过室内试验,研究了不同频率的低频脉冲波对多孔介质中单相、两相液体流动的影响.研究表明,适当的低频脉冲波动可以改善水驱油效果,提高水驱采收率,并降低含水率,而且振动增产效果与振动参数有关.低频脉冲波频率在岩心固有频率附近时岩心渗透率提高最多;振动增产效果还与岩心的渗透率有关,对低渗透率岩心的增产效果要好于中、高渗岩心.对于低渗透率岩心,残余油饱和度降幅可达10%,采收率提高幅度可达15%.

Study on the effect law of low-frequency pulse waves on the seepage performance of reservoir cores

The low-frequency pulse production increasing technique is a new oil recovery factor enhancing method.The influences of the low-frequency pulse of different frequencies on the flow of single-phase and two-phase fluid in porous media are studied by laboratory core experiments using self-designed vibration oil production testing unit.The results show that,appropriate low-frequency pulse wave can improve oil displacement result,enhance recovery factor and decrease water content.The result of oil production increasing is related to the frequency of the low-frequency pulse,the permeability of core is the most increased when the frequency is near the natural frequency of the core.The result of oil production increasing is also related to the permeability of the cores,the oil production increasing result of low-permeability cores is better than that of medium or high permeability cores.By the low-frequency pulse,the decline of the residual oil saturations of the low-permeability cores can reach to 10%,and the increase of their recovery factors can reach to 15%.