Multiphase flow through cleats in coal. Annual report, September 1990-August 1991
Coalbed reservoir permeability is primarily controlled by cleats and fractures in the coal. Because coalbeds are often saturated with brine, the simultaneous flow of gas and water occurs. A formal program of experimental and numerical research is underway to investigate the effect of cleat void geometry on multiphase flow through coal. Sample preparation techniques were developed for preparing coal drill cores for gas flow experiments and metal injection experiments. A Wood's metal porosimetry system was designed and built that consists of a hydrostatic pressure vessel, pore fluid system, and a data acquisition system. The feasibility of using Wood's metal porosimetry on coal was demonstrated. Data on effective cleat porosity, cleat aperture, spatial distribution of apertures, cleat density and cleat spacing were obtained. A stratified continuum model was used to generate cleat void simulations for modeling two-phase flow in a cleat. Two-phase flow modeling is based on capillary pressure effects alone and examines the effect of trapping water in a cleat on the capillary pressure-saturation relationship.
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- Resource Type:
- Technical Report
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- Other Information: Portions of this document are not fully legible
- Research Org:
- Purdue Univ., Lafayette, IN (United States). Dept. of Earth and Atmospheric Sciences
- Country of Publication:
- United States
- 01 COAL, LIGNITE, AND PEAT; 03 NATURAL GAS; COAL DEPOSITS; PERMEABILITY; GROUND WATER; MULTIPHASE FLOW; FRACTURED RESERVOIRS; INJECTION; MATHEMATICAL MODELS; POROSITY; SEISMIC WAVES; TEST FACILITIES; VOIDS; WAVE PROPAGATION; FLUID FLOW; GEOLOGIC DEPOSITS; HYDROGEN COMPOUNDS; INTAKE; MINERAL RESOURCES; OXYGEN COMPOUNDS; RESOURCES; WATER 011000* -- Coal, Lignite, & Peat-- Reserves, Geology, & Exploration; 030300 -- Natural Gas-- Drilling, Production, & Processing
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