Identification of potential locations for well placement in developed coalbed methane reservoirs

Salmachi, Alireza, Bonyadi, Mohammad Reza, Sayyafzadeh, Mohammad and Haghighi, Manouchehr (2014) Identification of potential locations for well placement in developed coalbed methane reservoirs. International Journal of Coal Geology, 131 250-262. doi:10.1016/j.coal.2014.06.018


Author Salmachi, Alireza
Bonyadi, Mohammad Reza
Sayyafzadeh, Mohammad
Haghighi, Manouchehr
Title Identification of potential locations for well placement in developed coalbed methane reservoirs
Journal name International Journal of Coal Geology   Check publisher's open access policy
ISSN 0166-5162
1872-7840
Publication date 2014-09-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.coal.2014.06.018
Open Access Status Not yet assessed
Volume 131
Start page 250
End page 262
Total pages 13
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Abstract This study investigates well placement in developed coalbed methane (CBM) reservoirs. A workflow is developed to find potential locations for well placement within the reservoir. It consists of a reservoir simulator and statistical analysis. The application of this workflow is to reduce the need to perform computationally expensive simulations in large reservoirs to obtain potential locations for drilling an additional well. The workflow is also used to study the role of dominant reservoir properties in finding potential locations for well placement. The effects of permeability anisotropy, gas and water relative permeabilities, sorption time, and water content in well placement are discussed.Results demonstrate that permeability anisotropy results in the formation of elliptical drainage areas around the wells. When drainage patterns are orthogonal to the direction of placement of wells, the drainage area of the reservoir is large and penetrated into distant locations. This leads to a non-uniform drainage area and extends well placement options to distant locations. Comparison between well placement in two scenarios with different gas and water relative permeabilities shows that potential locations tend to be on a border region between existing wells and virgin area when water mobility is restricted by water relative permeabilities. This region has the advantage of having higher pressure and gas content compared to locations among existing wells. In this study, changing the sorption time does not affect the well placement within the reservoir. Except at very early times, gas production from presented reservoir models is mainly controlled by Darcy flow in cleat system (permeability-dominated) rather than diffusion process in coal matrix.
Keyword Coalbed methane
Detection theory
Infill potential locations
Simulation model
Statistical analysis
Well placement
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Information Technology and Electrical Engineering Publications
 
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