PSU-COALCOMP, a compositional coalbed methane reservoir simulator, was used to model the primary and enhanced recovery of coalbed methane by CO 2 injection for various coal properties and operational scenarios. CO 2 injected into the coal-seam during sequestration was effective in stripping the initially adsorbed methane within the swept area while staying adsorbed on the coal surface. Larger volumes of CO 2 could be injected into coal-seams that had lower permeabilities, smaller cleat/fracture spacing, higher CO 2 sorption volume constants, lower CO 2 sorption pressure constants, higher initial reservoir pressure, or lower concentrations of CO 2 in the free gas. Diagonally placed horizontal injectors provided a better sweep of the system thereby maximizing the amount of CO 2 sequestered in a given coal-seam. Injector lengths were important for maximizing the amount of CO 2 sequestered and there was a given injector length that maximized this amount for any given pattern. Primary production time did not significantly affect the amount of CO 2 sequestered, but higher injection pressures shortened project life and sequestered more CO 2. The performance of the predictor tool developed could be used in the field as a screening tool for coal-seams that are being considered for CO 2 sequestration. This is an abstract of a paper presented at the SPE Annual Technical Conference and Exhibition (Houston, TX 9/26-29/2004).
|Published - 2004
|2004 SPE Annual Technical Conference and Exhibition - Houston, TX, United States
Duration: Sep 26 2004 → Sep 29 2004
|2004 SPE Annual Technical Conference and Exhibition
|9/26/04 → 9/29/04
All Science Journal Classification (ASJC) codes
- General Engineering