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A fully coupled hydro-mechanical model for the modeling of coalbed methane recovery

A fully coupled hydro-mechanical model for the modeling of coalbed methane recovery
A fully coupled hydro-mechanical model for the modeling of coalbed methane recovery
Most coal seams hold important quantities of methane which is recognized as a valuable energy resource. Coal reservoir is considered not conventional because methane is held adsorbed on the coal surface. Coal is naturally fractured, it is a dual-porosity system made of matrix blocks and cleats (i.e fractures). In general, cleats are initially water saturated with the hydrostatic pressure maintaining the gas adsorbed in the coal matrix. Production of coalbed methane (CBM) first requires the mobilization of water in the cleats to reduce the reservoir pressure. Changes of coal properties during methane production are a critical issue in coalbed methane recovery. Indeed, any change of the cleat network will likely translate into modifications of the reservoir permeability. This work consists in the formulation of a consistent hydro-mechanical model for the CBM production modeling. Due to the particular structure of coal, the model is based on a dual-continuum approach to enrich the macroscale with microscale considerations. Shape factors are employed to take into account the geometry of the matrix blocks in the mass exchange between matrix and fractures. The hydro-mechanical model is fully coupled. For example, it captures the sorption-induced volumetric strain or the dependence of permeability on fracture aperture, which evolves with the stress state. The model is implemented in the finite element code Lagamine and is used for the modeling of one production well. A synthetic reservoir and then a real production case are considered. To date, attention has focused on a series of parametric analyses that can highlight the influence of the production scenario or key parameters related to the reservoir.
Coalbed methane, Dual-porosity, Shape factor, Couplings, Reservoir modeling
1875-5100
307-325
Bertrand, François
6af4d3fe-fe00-408d-9deb-f862af0a2799
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Collin, Frédéric
27fa6a2d-f8e2-473f-a3b2-070eca6a9c3a
Bertrand, François
6af4d3fe-fe00-408d-9deb-f862af0a2799
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Collin, Frédéric
27fa6a2d-f8e2-473f-a3b2-070eca6a9c3a

Bertrand, François, Cerfontaine, Benjamin and Collin, Frédéric (2017) A fully coupled hydro-mechanical model for the modeling of coalbed methane recovery. Journal of Natural Gas Science and Engineering, 46, 307-325. (doi:10.1016/j.jngse.2017.07.029).

Record type: Article

Abstract

Most coal seams hold important quantities of methane which is recognized as a valuable energy resource. Coal reservoir is considered not conventional because methane is held adsorbed on the coal surface. Coal is naturally fractured, it is a dual-porosity system made of matrix blocks and cleats (i.e fractures). In general, cleats are initially water saturated with the hydrostatic pressure maintaining the gas adsorbed in the coal matrix. Production of coalbed methane (CBM) first requires the mobilization of water in the cleats to reduce the reservoir pressure. Changes of coal properties during methane production are a critical issue in coalbed methane recovery. Indeed, any change of the cleat network will likely translate into modifications of the reservoir permeability. This work consists in the formulation of a consistent hydro-mechanical model for the CBM production modeling. Due to the particular structure of coal, the model is based on a dual-continuum approach to enrich the macroscale with microscale considerations. Shape factors are employed to take into account the geometry of the matrix blocks in the mass exchange between matrix and fractures. The hydro-mechanical model is fully coupled. For example, it captures the sorption-induced volumetric strain or the dependence of permeability on fracture aperture, which evolves with the stress state. The model is implemented in the finite element code Lagamine and is used for the modeling of one production well. A synthetic reservoir and then a real production case are considered. To date, attention has focused on a series of parametric analyses that can highlight the influence of the production scenario or key parameters related to the reservoir.

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More information

Accepted/In Press date: 10 July 2017
e-pub ahead of print date: 20 August 2017
Published date: October 2017
Keywords: Coalbed methane, Dual-porosity, Shape factor, Couplings, Reservoir modeling

Identifiers

Local EPrints ID: 444206
URI: http://eprints.soton.ac.uk/id/eprint/444206
ISSN: 1875-5100
PURE UUID: 5b753c58-dc5e-4a79-b25e-4ceab0d28987
ORCID for Benjamin Cerfontaine: ORCID iD orcid.org/0000-0002-4833-9412

Catalogue record

Date deposited: 01 Oct 2020 16:34
Last modified: 07 Oct 2020 02:27

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Contributors

Author: François Bertrand
Author: Frédéric Collin

University divisions

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