在模型中引入了超滤常数，根据超滤常数将超滤过程稳态渗透通量计算分为有滤饼层和无滤饼层两种情况。
The ultrafiltration constant is introduced to this model, by which the steady ultrafiltration process can be divided into two types: in the presence of cake and in the absence of cake.
为了研究低渗透砂岩的启动压力梯度，设计了一种非稳态渗流中测量压力的试验方法。
The threshold pressure gradient of low permeability sandstone was studied experimentally by measuring the pressure attenuation in an unsteady seepage flow.
用等值渗流阻力法解决了这个难题，建立了裂缝性低渗透油藏稳态渗流的理论模型。
Using the steady-state productivity equation, a conventional method, is difficult to theoretically deal with the randomly dispersed natural fractures.
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