THE PSEUDOSTEADY STATE FLOW PROBLEM OF COALBED GAS IN DEFORMED MEDIA WITH DOUBLE POROSITY[
Received date: 2004-07-13
Revised date: 2004-10-09
Online published: 2004-12-20
In this paper,the pressure behavior of the flow problem with deformed double porosity is studied, not only considering the double porosity and absorption of coal seams but also the deformation of medium. The new mathematical models of pseudosteady state flow problem with deformed double porosity are built by introducing the permeability module. The dependence of permeability on pore pressure makes the flow equation strongly nonlinear. The numerical solutions for pseudosteady state flow models are obtained by using Newtonian iterative method in an infinitely large system and the finite closed system. The change rules of pressure are discussed when the parameters of the models change. The plots of type pressure curves are given, and the results can be provided to theoretical basis and well-test method for oil field.
LIU Shan, TONG Deng-ke . THE PSEUDOSTEADY STATE FLOW PROBLEM OF COALBED GAS IN DEFORMED MEDIA WITH DOUBLE POROSITY[[J]. Natural Gas Geoscience, 2004 , 15(6) : 669 -672 . DOI: 10.11764/j.issn.1672-1926.2004.06.669
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