Experimental Study on Gas-water Two-phase Seepage Characteristics of Water-saturated Gas-containing Coal
WEI Le
WANG Dengke
LIU Zhiwei
Abstract：Through experiments on gas-water two-phase permeability of water-saturated gas-containing coal samples under the constant temperature condition, study was carried out on the permeation characteristics and rule of gas-water two-phase flow. Tests were made on the seepage discharge of gas-containing coal samples with the change of the saturation degree of coal under different combinations of confining pressures and gas pressures by using the self-developed triaxial gas seepage testing system, the relational expression between the water content and the permeability of gas-containing coal was obtained, and some new understandings on gas-water two-phase seepage characteristics of water-saturated gas-containing coal were revealed:(1) with the decrease of water saturation, water permeability did not always reduced, but it still assumed a whole reduction trend with the decrease of the water saturation of coal samples, there was a large fluctuation in the early stage, permeability decreased first and then increased to a peak, then it gradually decreased and quickly decreased to the minimum extent;(2) water had a significant inhibitory effect on gas permeability, the gas can hardly get through coal samples in a water-saturated state, but under the conditions of high water saturation, gas permeability was not necessarily close to zero; ( 3 ) with the increase of gas pressure, gas-water isotonic point moved to the right.
Keywords：saturated watergasgas-containing coalpermeabilitygas-water two-phase permeationseepage characteristics
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 1-4 )