致密砂岩中建立高含水饱和度的新方法

A New Method of Establishing High Water Saturation and Tight Sandstones

建立含水饱和度的方法主要有烘干法(或风干法)、离心法、驱替法和毛管自吸法。但在实验的具体操作过程中发现,如果致密砂岩气层存在高含水饱和度现象,利用这些方法建立高含水饱和度状态则十分困难。提出一种建立含水饱和度的新方法——压力渗吸法,利用该方法能够在致密岩心中建立所需的高含水饱和度,并通过实验验证该方法的可行性。

At present,there are several methods to establish water saturation such as drying method,centrifugal method,displacement method and spontaneous imbibition method.But during the experimental procedures,if the tight gas sands has high water saturation,it is very difficult or impractical to establish high water saturation with those methods which mentioned before.The paper puts forward a new method of establishing water saturation called pressure dialysis method,which can be used to establish high water saturation in tight sandstones and has been proved by experiments to be feasible.