Effects of net stress on two - Phase flow in coal fractures

Dennis A. Alexis, Zuleima Karpyn, Turgay Ertekin, Dustin Crandall

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Determination of petro-physical properties of coal bed methane (CBM) reservoirs is essential in evaluating a potential prospect for commercial exploitation. In particular, coal fracture permeability and relative permeability of coal to gas and water are the most significant rock properties controlling the transport of natural gas and water to the wellbore. In this work, absolute and relative permeability of different coal samples were determined experimentally under steady-state flowing conditions. Multiphase flow tests were conducted using brine, helium as the flowing phases under different magnitudes of confining and pore pressures. Results indicate that effective stress (Confining pressure - average pore pressure) has a significant effect on both absolute and relative permeability of coal. As a result, relative permeability characteristics of CBM systems were found to be insufficiently represented as sole functions of fluid saturation. In addition, laboratory measurements were used to conduct field scale simulations of primary recovery from CBM systems using variable, stress-dependent relative permeabilities.

Original languageEnglish (US)
Title of host publicationUnconventional Resources Technology Conference 2013, URTC 2013
PublisherUnconventional Resources Technology Conference (URTEC)
ISBN (Print)9781613993026
StatePublished - Jan 1 2013
EventUnconventional Resources Technology Conference 2013, URTC 2013 - Denver, United States
Duration: Aug 12 2013Aug 14 2013

Publication series

NameUnconventional Resources Technology Conference 2013, URTC 2013

Other

OtherUnconventional Resources Technology Conference 2013, URTC 2013
CountryUnited States
CityDenver
Period8/12/138/14/13

Fingerprint

Two phase flow
Coal
Pore pressure
Multiphase flow
Helium
Water
Natural gas
Physical properties
Rocks
Recovery
Fluids
Gases
Coal bed methane

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment

Cite this

Alexis, D. A., Karpyn, Z., Ertekin, T., & Crandall, D. (2013). Effects of net stress on two - Phase flow in coal fractures. In Unconventional Resources Technology Conference 2013, URTC 2013 (Unconventional Resources Technology Conference 2013, URTC 2013). Unconventional Resources Technology Conference (URTEC).
Alexis, Dennis A. ; Karpyn, Zuleima ; Ertekin, Turgay ; Crandall, Dustin. / Effects of net stress on two - Phase flow in coal fractures. Unconventional Resources Technology Conference 2013, URTC 2013. Unconventional Resources Technology Conference (URTEC), 2013. (Unconventional Resources Technology Conference 2013, URTC 2013).
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Alexis, DA, Karpyn, Z, Ertekin, T & Crandall, D 2013, Effects of net stress on two - Phase flow in coal fractures. in Unconventional Resources Technology Conference 2013, URTC 2013. Unconventional Resources Technology Conference 2013, URTC 2013, Unconventional Resources Technology Conference (URTEC), Unconventional Resources Technology Conference 2013, URTC 2013, Denver, United States, 8/12/13.

Effects of net stress on two - Phase flow in coal fractures. / Alexis, Dennis A.; Karpyn, Zuleima; Ertekin, Turgay; Crandall, Dustin.

Unconventional Resources Technology Conference 2013, URTC 2013. Unconventional Resources Technology Conference (URTEC), 2013. (Unconventional Resources Technology Conference 2013, URTC 2013).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Alexis DA, Karpyn Z, Ertekin T, Crandall D. Effects of net stress on two - Phase flow in coal fractures. In Unconventional Resources Technology Conference 2013, URTC 2013. Unconventional Resources Technology Conference (URTEC). 2013. (Unconventional Resources Technology Conference 2013, URTC 2013).