低渗气层岩样束缚水饱和度的室内实现方法

在进行储层损害室内评价过程中,关键之一是准确测定和计算代表储层的岩样被钻井液或其它介质污染前后气相渗透率的变化。为此,在测定岩样气相渗透率时,应使所试验的岩样内部含水饱和度保持一基本不变的值,在室内试验的基础上,给出了实现并保持低渗气层岩样束缚水饱和度的试验方法──加湿气体稳态驱替法。

LABORATORY CONTROL OF THE IRREDUCIBLE WATER SATURATION OF CORE SAMPLE FROM LOW PERMEABLE GAS RESERVOIR

The gas phrase permeability of core sample is one of t he important indexes for laboratory evaluation of formation damage, and the permeability changes before and after the contamination by drilling fluid and other medium must be m easured and calculated accurately. Keeping the water saturation of core sample a t a relatively stable value is very important for accurate measurement and calcu lation. Thus a laboratory testing method, namely wetted gas steady displacement is presented for maintaining the irreducible water saturation of core sample in a relatively stable level.