Unsteady-state nature of sorption and diffusion phenomena in the micropore structure of coal. Part 2. Solution

J. E. Kolesar, Turgay Ertekin, S. T. Obut

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Abstract

A single-phase, 1D mathematical model, formulated in Part 1 of this study, is used to study unsteady-state micropore sorption in the composite micropore/fracture coalbed-methane-transport problem. The mathematical model is solved numerically by writing the transport equations in finite-difference form and linearizing the residual form of the difference equations with the generalized Newton-Raphson procedure. The numerical model is used to compare methane production rates predicted by unsteady- and quasisteady-state sorption formulations. Results indicate that the two models give different rates during early degasification periods. The high rates predicted by the unsteady-state model, however, generally approached lower quasisteady-state rates within the first few months of simulation.

Original languageEnglish (US)
Pages (from-to)89-9719398
Number of pages9719310
JournalSPE Formation Evaluation
Volume5
Issue number1
StatePublished - Mar 1 1990

All Science Journal Classification (ASJC) codes

  • Process Chemistry and Technology

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