ERA

Download the full-sized PDF of Reservoir and geomechanical coupled simulation of CO2 sequestration and enhanced coalbed methane recoveryDownload the full-sized PDF

Analytics

Share

Permanent link (DOI): https://doi.org/10.7939/R3P07Q

Download

Export to: EndNote  |  Zotero  |  Mendeley

Communities

This file is in the following communities:

Graduate Studies and Research, Faculty of

Collections

This file is in the following collections:

Theses and Dissertations

Reservoir and geomechanical coupled simulation of CO2 sequestration and enhanced coalbed methane recovery Open Access

Descriptions

Other title
Subject/Keyword
Methane
CO2
Permeability
Models
Sequestration
Geomechanical
Enhanced
Coupled
Coalbed
Simulation
Porosity
Reservoir
Recovery
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Gu, Fagang
Supervisor and department
Chalaturnyk, Rick (Civil and Environmental Engineering)
Examining committee member and department
Settari, Antonin(Tony) (Chemical & Petroleum Engineering, The University of Calgary)
Chalaturnyk, Rick (Civil and Environmental Engineering)
Chan, Dave H. (Civil and Environmental Engineering)
Sacchi, Mauricio D. (Physics)
Xu, Zhenghe (Chemical and Materials Engineering)
Nouri, Alireza (Civil and Environmental Engineering)
Department
Department of Civil and Environmental Engineering
Specialization

Date accepted
2009-10-14T19:18:45Z
Graduation date
2009-11
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
Coalbeds are an extremely complicated porous medium with characteristics of heterogeneity, dual porosity and stress sensitivity. In the past decades great achievements have been made to the simulation models of pressure depletion coalbed methane (CBM) recovery process and CO2 sequestration and enhanced coalbed methane (ECBM) recovery process. However, some important mechanisms are still not or not properly included. Among them, the influence of geomechanics is probably the most important one. Because of its influence coalbed permeability, the key parameter for the success of recovery processes, changes drastically with alterations of in situ stresses and strains during these processes. In present reservoir simulators, the change of coalbed permeability is estimated with analytical models. Due to the assumptions and over simplifications analytical models have limitations or problems in application. In this research to properly estimate the changes of permeability and porosity in the simulation of CO2 sequestration and ECBM recovery process, comprehensive permeability and porosity models have been developed with minimum assumptions and simulation methods established. Firstly, a set of continuum medium porosity and permeability coupling models is built up and a simulation procedure to apply these models in reservoir and geomechanical coupled simulations proposed. Using the models and simulation procedure a sensitivity study, mainly on the parameters related to coalbed permeability change and deformation, has been made for the CBM recovery process. Then based on the understanding, a set of discontinuum medium porosity and permeability coupling models is developed and a procedure to apply these models in reservoir and geomechanical coupled simulations presented. The new models are more comprehensive and adaptable, and can accommodate a wide range of coalbeds and in situ conditions. The proposed equivalent continuum deformation model for coal mass is validated by simulating a set of lab tests including a uniaxial compression test in vacuum and a CO2 swelling test under axial constraint in the longitudinal (vertical) direction. At last the discontinuum medium porosity and permeability coupling models and the simulation procedure are successfully applied to simulate part of a series of micro-pilot tests of ECBM and CO2 sequestration at Fenn Big Valley of Alberta, Canada.
Language
English
DOI
doi:10.7939/R3P07Q
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication

File Details

Date Uploaded
Date Modified
2014-04-28T20:49:57.816+00:00
Audit Status
Audits have not yet been run on this file.
Characterization
File format: pdf (Portable Document Format)
Mime type: application/pdf
File size: 2955022
Last modified: 2015:10:12 10:23:33-06:00
Filename: Gu_Fagang_Fall 2009.pdf
Original checksum: 1ad88f4f47970dafaf311a6cd82123da
Well formed: false
Valid: false
Status message: Invalid object number or object stream offset=25314
Activity of users you follow
User Activity Date