﻿ 低渗透油藏渗流模型新解

# 低渗透油藏渗流模型新解 A New Model of Liquid Flows in Low Permeability Reservoirs

Abstract: In the petroleum development engineering, the low permeability reservoir is that the permeability of porous media is lower than 50 micro-Darcy. Because of the existence of the threshold pressure gradient (TPG), the mathemati- cal model of liquid flow in low permeability media is difficult to describe this kind of flow. Until now there is not an ideal model, although there are several models used to fields of well testing analysis and petroleum numerical simula- tions. Based on the force between liquid and surface solid, and the negative slip boundary model of a micro-channel, a new liquid flow model was derived for low permeability reservoirs in this paper. First defined the no movement liquid layer close to the solid surface as the boundary stick layer which regarded as the negative slip length, and used the in- verse proportion of the height of the boundary stick layer to the pressure drop gradient, the formulae of liquid velocity and the flow rate of a round channel were derived; Then the model of liquid flows in low permeability reservoirs was gotten based on the capillaries model; Finally the flow models were tested by examples and shown how to get the TPG of a low permeability reservoir. The results show that the new model has a clear physical definition, and can be easily used to describe liquid flows in low permeability media.

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