Permeability Evolution of Bituminous Coal and Its Dynamic Control, a Case Study from the Southeastern Ordos Basin, China

Yongkai Qiu (), Dingjun Chang, Fengrui Sun, Abulaitijiang Abuduerxiti and Yidong Cai
Additional contact information
Yongkai Qiu: Coal Reservoir Laboratory of National Engineering Research Center of CBM Development & Utilization, School of Energy Resource, China University of Geosciences (Beijing), Beijing 100083, China
Dingjun Chang: School of Geophysics and Information Technology, China University of Geosciences (Beijing), Beijing 100083, China
Fengrui Sun: Coal Reservoir Laboratory of National Engineering Research Center of CBM Development & Utilization, School of Energy Resource, China University of Geosciences (Beijing), Beijing 100083, China
Abulaitijiang Abuduerxiti: Fengcheng Oilfield Operation District, Xinjiang Oilfield Company, CNPC, Karamay 834000, China
Yidong Cai: Coal Reservoir Laboratory of National Engineering Research Center of CBM Development & Utilization, School of Energy Resource, China University of Geosciences (Beijing), Beijing 100083, China

Energies, 2023, vol. 16, issue 24, 1-18

Abstract: Coalbed methane (CBM) reservoirs’ permeability is the result of dynamic variations influenced by tectonics, hydrology and the CBM production process. Taking samples from the southeastern Ordos Basin, China, the permeability evolution of bituminous coal and its control were analyzed in three steps: (1) the coal fracture permeability evolution was acquired via X-ray CT scanning and permeability evolution experiments; (2) the permeability variation was determined while considering the coupling characteristics effective stress, gas slippage, and matrix shrinkage effect and its influencing factors; and (3) a dynamic permeability model was built while considering those effects. For samples in which neither fractures nor bedding developed, the permeability decreased first and then increased as the gas pressure increased. For samples with fractures that developed parallel to the axial direction, with a gradual increase in gas pressure, the permeability also increased. As the gas pressure decreased, the matrix shrinkage effect became positive, resulting in a permeability increase. The gas slippage effect was positive in the low-pressure stage, which also resulted in a permeability increase.

Keywords: coalbed methane reservoirs; permeability evolution; effective stress; gas slippage effect; matrix shrinkage; dynamic model (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/16/24/8046/pdf (application/pdf)
https://www.mdpi.com/1996-1073/16/24/8046/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:16:y:2023:i:24:p:8046-:d:1299525

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().