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Development of Techniques and the Measurement of Relative Permeability and Capillary Pressure Relationships in Coal.

Taber-JJ; Fulton-PF; Dabbous-MK; Reznik-AA
NTIS: PB/232-244 Available for Reference At Bureau Libraries :80 pages
In this study (Contract No. G0122006), gas and water permeabilities of a large number of samples from the Pittsburgh and Pocahontas coals were measured at various overburden and mean flow pressures. A wide variation in the air and water permeabilities was obtained for each type of coal. Overburden pressure has the most significant effect on the single-phase permeability. Considerable hysteretic effect was observed for both air and water permeabilities. Gas permeabilities are affected to a lesser degree by mean flow pressures above atmospheric. However at subatmospheric mean pressures, appreciable increase in permeability occurs for low permeability samples. Air and water relative permeabilities were also measured for numerous samples of Pittsburgh and Pocahontas coals. Tests were performed under steady-state conditions for both drainage and inhibition cycles. Results indicate that the flow of gas is greatly reduced during the latter process, whereas it is largely undiminished over a wide water-saturation range during draining.
Publication Date
Document Type
CP; Final Contract Report;
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
OFR 22-74
NIOSH Division
Source Name
NTIS: PB/232-244; Available for Reference At Bureau Libraries
Performing Organization
University of Pittsburgh
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division