Articles

Influence of Fluid Boundary Layer on Fluid Flow in Low Permeability Oilfields

  • LIU Weidong;LIU Ji;SUN Linghui;LI Yang;LAN Xiyan
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  • 1. Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, Hebei Province, China ;2. PetroChina Research Institute of Petroleum Exploration & Development-Langfang, Langfang 065007, Hebei Province, China;3. Research Institute of Petroleum Exploitation and Development, Huabei Oilfield, China National Petroleum Corporation, Renqiu 062552, Hebei Province, China

Received date: 2011-06-29

  Revised date: 2011-07-14

  Online published: 2011-08-08

Abstract

A fluid boundary layer would impede the flow of fluid near the pore and the throat of the rock in the low-permeability reservoir because of the small size of pore-throat, the complex pore structures and the large solid-liquid interfacial force. In order to study the influence of the fluid boundary layer on the fluid flow in a low permeability reservoir, the relationships between the fluid flow rate, the boundary layer thickness and the pressure gradient are obtained through analysis and fitting data, based on the experimental results of deionized water flowing through microtubes of radii of 10.0, 7.5 and 5.0μm, respectively. It is indicated that, due to the existence of the fluid boundary layer, the flow of deionized water through microtubes with different radii deviates from the classical Darcy flow pattern and shows nonlinear characteristics with a threshold pressure gradient under low pressure conditions. The degree of deviation of the flow pattern from the law of Darcy flow increases and the nonlinearity of the flow becomes more significantly with the decrease of the tube diameter. The fluid boundary layer thickness decreases exponentially with the pressure gradient and tends to assume a stable value when the pressure gradient approaches a critical value. The formula for single-phase fluid seepaging in a low permeability reservoir is obtained based on the non-equivalent diameter capillary module.

Cite this article

LIU Weidong;LIU Ji;SUN Linghui;LI Yang;LAN Xiyan . Influence of Fluid Boundary Layer on Fluid Flow in Low Permeability Oilfields[J]. Science & Technology Review, 2011 , 29(22) : 42 -44 . DOI: 10.3981/j.issn.1000-7857.2011.22.004

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