NDLI: A Computational Approach to Determine Average Reservoir Pressure in a Coalbed Methane (CBM) Well Flowing Under Dominant Matrix Shrinkage Effect

Content Provider	Springer Nature Link
Author	Upadhyay, Rajeev Laik, Sukumar
Copyright Year	2017
Abstract	Desorption of gas from coal matrix alters the pore volume of fracture network. Consequently, cleat porosity and permeability of reservoir changes as pressure depletes. The method of standard pressure analysis calculations produces incorrect results in the case of coalbed methane reservoirs producing under dominant matrix shrinkage effect. The change in cleat porosity and permeability due to shrinkage of coal matrix following gas desorption with pressure depletion invalidates the underlying assumptions made in the derivation of diffusivity equation. Consequently, equations of pseudo-steady state commonly used in conventional reservoirs no longer remain valid as the porosity and permeability values change with pressure depletion. In this paper, effort has been made to describe pseudo-steady-state flow in coalbed methane reservoirs in the form of a new equation that accounts for pressure dependency of cleat porosity and permeability due to shrinkage of coal matrix. The concept of Al-Hussainy et al. (1966) has been extended to define a new pseudo-pressure function which assimilates within itself the pressure dependence of porosity and permeability Palmer and Mansoori (1998). Equation has been used to relate the cleat porosity with pressure. The equation-based computational method suggested in this paper finds its usefulness in estimating average reservoir pressure for any known flowing bottom hole pressure and thus reducing the frequency of future pressure buildup tests. The new equation is also useful in predicting reservoir pressure under the situation when coal matrix shrinks below desorption pressure. The equation used in the computational method has been validated with the help of numerical simulator CMG-GEM.
Starting Page	1167
Ending Page	1188
Page Count	22
File Format	PDF
ISSN	01693913
Journal	Transport in Porous Media
Volume Number	116
Issue Number	3
e-ISSN	15731634
Language	English
Publisher	Springer Netherlands
Publisher Date	2017-01-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coal Matrix shrinkage Cleat porosity Cleat permeability Stress-dependent pseudo-pressure (SDPP) Geotechnical Engineering & Applied Earth Sciences Industrial Chemistry/Chemical Engineering Hydrology/Water Resources Civil Engineering Hydrogeology Classical and Continuum Physics
Content Type	Text
Resource Type	Article
Subject	Catalysis

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Impact of CO$_{2}$ Injection on Flow Behavior of Coalbed Methane Reservoirs

Evolution of Coal Permeability with Cleat Deformation and Variable Klinkenberg Effect

Modeling of Coal Fine Migration During CBM Production in High-Rank Coal

A New Coal-Permeability Model: Internal Swelling Stress and Fracture–Matrix Interaction

Temporal and Spatial Evolutions of Permeability During CBM Drainage Under Different Initial Conditions

CBM exploration: Permeability of coal owing to cleat and connected fracture

Gas Sorption and the Consequent Volumetric and Permeability Change of Coal I: Experimental

An Experimental Study on the Effects of Water Content on Coalbed Gas Permeability in Ground Stress Fields

Controlling Bottom Hole Flowing Pressure Within a Specific Range for Efficient Coalbed Methane Drainage

A Computational Approach to Determine Average Reservoir Pressure in a Coalbed Methane (CBM) Well Flowing Under Dominant Matrix Shrinkage Effect

Similar Documents

Impact of CO$_{2}$ Injection on Flow Behavior of Coalbed Methane Reservoirs

Evolution of Coal Permeability with Cleat Deformation and Variable Klinkenberg Effect

Modeling of Coal Fine Migration During CBM Production in High-Rank Coal

A New Coal-Permeability Model: Internal Swelling Stress and Fracture–Matrix Interaction

Temporal and Spatial Evolutions of Permeability During CBM Drainage Under Different Initial Conditions

CBM exploration: Permeability of coal owing to cleat and connected fracture

Gas Sorption and the Consequent Volumetric and Permeability Change of Coal I: Experimental

An Experimental Study on the Effects of Water Content on Coalbed Gas Permeability in Ground Stress Fields

Controlling Bottom Hole Flowing Pressure Within a Specific Range for Efficient Coalbed Methane Drainage

A Computational Approach to Determine Average Reservoir Pressure in a Coalbed Methane (CBM) Well Flowing Under Dominant Matrix Shrinkage Effect