Feasibility of using Wood's metal porosimetry techniques to measure the fracture-void geometry of cleats in coal. Topical report, September 1990-June 1991
Feasibility of using Wood's metal porosimetry techniques to measure the fracture-void geometry of cleats in coal. Topical report, September 1990-June 1991 Fractures and cleats in coal are the primary conduits along which fluids move through coalbed reservoirs. Fluid flow through a fracture is controlled by the geometry and the distribution of the void spaces. In the report, the feasibility of using a Wood's metal porosimetry technique to investigate the fracture void geometry of cleats in a whole coal drill core specimen is demonstrated. Wood's metal (a low melting point alloy) was injected into a coal specimen and allowed to solidify to form metal casts of the flow paths. The volume of voids forming the flow paths through the sample was determined gravinometrically. The casts were examined using computerized tomographic (CT) analysis and micrographs, showing the variable void geometry of cleats. The geometrical information on the cleat void geometry and the cleat network obtained from the Wood's metal porosimetry experiment include effective cleat porosity, cleat aperture, cleat density, and cleat spacing. Preliminary quantitative analysis was performed to characterize the spatial distribution of the flow paths in a cleat.
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