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Title: Development, testing, and application of a multi-well numerical coal seam degasification simulator

Abstract

A series of mathematical formulations and numerical developments equipped with finite-difference approximation to simulate the simultaneous flow of gas and water in a coal seam and a tight gas formation is presented. The simulator employs a multi-dimensional, multi-phase formulation in rectangular coordinates and has options to accommodate a number of vertical wells as well as horizontal wells. For the vertical wells the model is able to handle the simulation of post-fracture performance through either horizontally or vertically fractured wells. Mining activity is also included to investigate methane emission at the mine working faces. Furthermore, options exist to include a number of impermeable geological barriers within the system. The transport of gas in coal seams can be formulated using a dual transport approach. In this approach, flow through macropores can be modeled with Darcy's law through the pressure field whereas flow through micropores can be modeled with Fick's law of diffusion through the concentration field. The combination of these two transport mechanisms extends the application range of these models to tight gas sand reservoirs. This is achieved by the exclusion of the kinetic sorption model. This quasi-steady state kinetic sorption model is included to represent the desorption of methane from coalmore » grains. The developed numerical model has been tested and verified by using hypothetical reservoirs with increasing degrees of complexity and by history matching against the actual field data. Also, performance of the unconventional gas reservoir models has been compared against the performance of conventional gas reservoir models.« less

Authors:
Publication Date:
Research Org.:
Pennsylvania State Univ., University Park (USA)
OSTI Identifier:
6379192
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 03 NATURAL GAS; COAL SEAMS; DEGASSING; NATURAL GAS WELLS; SIMULATORS; DARCY LAW; DIFFUSION; EMISSION; FINITE DIFFERENCE METHOD; FRACTURED RESERVOIRS; FRACTURING; GAS FLOW; KINETIC EQUATIONS; LIQUID FLOW; MANY-DIMENSIONAL CALCULATIONS; MATHEMATICAL MODELS; METHANE; MINING; MULTIPHASE FLOW; PERMEABILITY; POROSITY; SANDSTONES; TESTING; USES; WATER; WORKING FACES; ALKANES; ANALOG SYSTEMS; COAL DEPOSITS; COMMINUTION; EQUATIONS; FLUID FLOW; FUNCTIONAL MODELS; GEOLOGIC DEPOSITS; HYDROCARBONS; HYDROGEN COMPOUNDS; ITERATIVE METHODS; MINERAL RESOURCES; NUMERICAL SOLUTION; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; RESOURCES; ROCKS; SEDIMENTARY ROCKS; WELLS; 012033* - Coal, Lignite, & Peat- Underground Mining- Mine Environment- (1987-); 030900 - Natural Gas- Artificial Stimulation, Plowshare- (-1989)

Citation Formats

Sung, W. Development, testing, and application of a multi-well numerical coal seam degasification simulator. United States: N. p., 1987. Web.
Sung, W. Development, testing, and application of a multi-well numerical coal seam degasification simulator. United States.
Sung, W. 1987. "Development, testing, and application of a multi-well numerical coal seam degasification simulator". United States.
@article{osti_6379192,
title = {Development, testing, and application of a multi-well numerical coal seam degasification simulator},
author = {Sung, W},
abstractNote = {A series of mathematical formulations and numerical developments equipped with finite-difference approximation to simulate the simultaneous flow of gas and water in a coal seam and a tight gas formation is presented. The simulator employs a multi-dimensional, multi-phase formulation in rectangular coordinates and has options to accommodate a number of vertical wells as well as horizontal wells. For the vertical wells the model is able to handle the simulation of post-fracture performance through either horizontally or vertically fractured wells. Mining activity is also included to investigate methane emission at the mine working faces. Furthermore, options exist to include a number of impermeable geological barriers within the system. The transport of gas in coal seams can be formulated using a dual transport approach. In this approach, flow through macropores can be modeled with Darcy's law through the pressure field whereas flow through micropores can be modeled with Fick's law of diffusion through the concentration field. The combination of these two transport mechanisms extends the application range of these models to tight gas sand reservoirs. This is achieved by the exclusion of the kinetic sorption model. This quasi-steady state kinetic sorption model is included to represent the desorption of methane from coal grains. The developed numerical model has been tested and verified by using hypothetical reservoirs with increasing degrees of complexity and by history matching against the actual field data. Also, performance of the unconventional gas reservoir models has been compared against the performance of conventional gas reservoir models.},
doi = {},
url = {https://www.osti.gov/biblio/6379192}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1987},
month = {Thu Jan 01 00:00:00 EST 1987}
}

Thesis/Dissertation:
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