Methane modeling: predicting the inflow of methane gas into coal mines. Quarterly technical progress report, April 1, 1982-June 30, 1982

Technical Report · Fri Jan 01 00:00:00 EST 1982

OSTI ID:6826604

Boyer, II, C M; Hoysan, P M; Pavone, A M; Richmond, O; Schwerer, F C; Smelser, R E

Work on Phase I of the Contract program is essentially complete and was reported in the Phase I Technical Report which has been reviewed and accepted by the Contract Technical Project Officer. Phase I work included a survey of relevant technical literature and development, demonstration and documentation of a computer model, MINE1D, for flow of methane and water in coal strata for geometries corresponding to an advancing mine face and to a mine pillar. The Phase I models are one-dimensional in the space variable but describe time-dependent (nonsteady) phenomena and include gas sorption phenomena. Some revisions have been made to input/output sections of MINE1D and the documentation has been expanded. These modifications will be reported in the next Quarterly Technical Report. Preliminary test scenarios have been formulated and reviewed with the Contract Technical Project Officer for measurement of emissions during room-and-pillar and longwall mining operations. These preliminary scenarios are described in this report. A mathematical model has been developed to describe the increased stresses on the coal seam near mine openings. The model is based on an approximate elastic/plastic treatment of the coal seam and an elastic treatment of surrounding strata. In this model, elastic compaction of the coal seam decreases porosity and permeability, whereas plastic deformation increases the porosity of the natural fracture network and thereby increases the permeability. The model takes into account the effect of changes in pore fluid pressure (in the natural fracture network of the coal seam) on the deformation of the coal seam. This model is described in this report, and will be programmed for inclusion in revised versions of MINE1D and for use in the two-dimensional computer models now under development. 8 figures.

• Research Organization: United States Steel Corp., Monroeville, PA. Research Lab.
• DOE Contract Number: AC22-80PC30123
• OSTI ID: 6826604
• Report Number(s): DOE/PC/30123-T6; ON: DE83001820
• Resource Relation: Other Information: Portions of document are illegible
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL SEAMS
DEGASSING
PERMEABILITY
POROSITY
STRESSES
METHANE
GAS FLOW
COAL MINING
COMPUTER CALCULATIONS
COMPUTERIZED SIMULATION
DEFORMATION
EXPERIMENTAL DATA
LONGWALL MINING
MATHEMATICAL MODELS
RESEARCH PROGRAMS
ROOM AND PILLAR MINING
ALKANES
COAL DEPOSITS
DATA
FLUID FLOW
GEOLOGIC DEPOSITS
HYDROCARBONS
INFORMATION
MINERAL RESOURCES
MINING
NUMERICAL DATA
ORGANIC COMPOUNDS
RESOURCES
SIMULATION
UNDERGROUND MINING
012000* - Coal
Lignite
& Peat- Mining
016000 - Coal
Lignite
& Peat- Health & Safety