界面分子力作用与渗透率的关系及其对渗流的影响

Relationship between interfacial molecular interaction and permeability and its influence on fluid flow.

将界面化学理论和渗流物理理论相结合，在毛细管模型与单分子层作用模型的基础上，推导出了固液界面分子力作用与多孔介质的渗透率或孔隙半径的近似关系式，并设计和进行了岩心流动对比实验。结果表明：在低渗透多孔介质中，液体渗流为非达西类型，渗流曲线特征为凹形曲线至直线，存在（拟）启动压力梯度；非达西特征取决于多孔介质的渗透率和流体性质；固液界面分子力作用随多孔介质的渗透率或孔隙半径增大而单调递减。在低渗透多孔介质中，固液界面分子力对液体渗流的影响较大，且为渗流具有非达西特征的主要原因；而在较高渗透率多孔介质中，它对渗流的影响可以忽略，液体渗流为达西类型。综述了非达西渗流应用研究现状。图２表１参１１（陈志宏摘）

This paper derives an approximate relationship between interfacial molecular interaction (IMI) and permeability of porous media according to a capillary model and an IMI model combining the basic theories of interfacial chemistry and porous flow physics. Contrast core flow tests are also designed and performed. The results show that: (1) a liquid flow through low permeability porous media has characteristics of non Darcy flow and there are starting pressure gradients; (2) the characteristics depend on the amount of the permeability as well as nature of fluid; (3) IMI decreases with the permeability or pore radius increasing; (4) the effect of IMI on flow through higher permeability porous media can be neglected, but it can not be done and it is the main reason why non Darcy flow through low permeability porous media occurs. The above reveals and clarifies the mechanism of a monophase liquid flow through low permeability porous media or reservoir. The status of study on non Darcy flow is reviewed in the end of the paper.