低渗透油藏岩电实验方法改进及应用效果

低渗透岩心岩电实验周期长、受饱和度分布影响大.通过改变原有仪器的测量方式,实现了模拟地层条件下快速确定阿尔奇参数.实验采用2个电极供电,4个测量电极测量岩心电阻,注-停-注的驱替方式,同时测量4个相邻电极间的电阻,以此评价驱替过程中沿岩心轴向上的饱和度分布均匀程度和末端效应.没有考虑毛管力平衡,提高了实验速度.在大庆油田东部低渗透油层测井解释评价中,使用此方法得到的阿尔奇参数取得了比使用通用参数好的效果.

Improved Rock Resistivity Measurement Method in Low Permeable Reservoir and Its Application

Archie parameters measurement usually needs a long period and is influenced by non-uniform distribution of saturation. To solve these problems, this paper presents a new method for fast determining Archie parameters by changing the mode of the measuring equipment. Two current electrodes and four potential electrodes are used to measure the resistance of the samples. Saturation distribution along the length of the samples and end-effect are assessed by measuring the resistances between the four potential electrodes during the driving process. Since capillary equilibrium is not needed, the experiment speed is faster greatly. The Archie parameters from the experimental data are better applied to the low porous and low permeable reservoir in the east of Daqing oilfield.