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以鄂尔多斯盆地大牛地气田低渗透砂岩气藏为研究对象,对同一岩心在不同含水饱和度下的渗流机理进行了实验和理论分析,认为低渗透含水岩心气体在低速、低压下渗流先受气体滑脱效应的影响,随着压力梯度的增大,启动压力梯度作用逐渐增强;当含水率增大到20%左右时,低速、低压阶段岩心受到滑脱效应和启动压力梯度的综合作用。这为低渗透气藏渗流机理研究提供了新思路。
Taking the low permeability sandstone gas reservoir of Daniudi gas field in the Ordos Basin as an example, the seepage mechanism of the same core under different water saturations is studied experimentally and theoretically. It is concluded that the low permeability and low pressure gas flow in low permeability sandstone gas reservoir Slippage effect. With the increase of pressure gradient, the effect of starting pressure gradient gradually increases. When the water content increases to about 20%, the core of low velocity and low pressure is affected by the combination of slippage effect and starting pressure gradient. This provides a new idea for the study on seepage mechanism of low permeability gas reservoirs.