机械振动对岩心毛管压力曲线及润湿性的影响

采用“半渗隔板法”和“自吸法”分别测振动前后岩样的毛管压力曲线及润湿性，用对比的方法研究振动对地层中界面现象的影响，对振动法增产的机理进行进一步的探讨．通过对毛管压力曲线及润湿性变化的分析得出在岩样固有频率附近振动对岩心的毛管压力曲线和润湿性影响最大，此时，毛管压力曲线的阀压值降低，饱和度中值压力降低，束缚水饱和度减小，而润湿性则表现为水湿性加强，岩心的绝对渗透率变大，有利于原油的增产和采收率的提高

The Effects of Mechanical Vibration on the Capillary Pressure Curve and the Wettability of a Core

The capillary pressure curves of cores before and after vibration are get with semipermeable membrane method,and the wettabilities with self absorption method.The effect of vibration on the formation interface phenomena is studied by comparision.The mechanism of vibration increase productivity is also discussed in detail.By analysing the changes of the capillary pressure curves and the wettabilities,it is shown that the effects of vibration on the capillary pressure curve and the wettability of a core are greatest near its natural freguency,whose expression is that the pressure threshold value of the capillary pressure curve,the pressure at the intermediate value of saturation and the irreducible water saturation are all decrease;the wettability tends to water wet,and the absolute permeability increases.All the results are advantageous to increasing crude output and recovery efficiency.