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Title: Novel Technological Approach To Enhance Methane Recovery from Class 2 Hydrate Deposits by Employing CO 2 Injection

Abstract

Class 2 hydrate accumulations are characterized by the presence of an aquifer underneath hydrate bearing sediment. Gas extraction from of these hydrate deposits is accompanied by release of large volumes of water that decreases gas production rates, imposes additional load on the lifting system and, as a result, degrades economical attractiveness of possible exploitation sites. Here, we study the enhanced methane production from Class 2 hydrate accumulations using the CO 2-assisted technique in which the aquifer serves as a target zone for CO 2 injection. The heat release associated with the CO 2 hydrate formation and reduction of the aquifer’s permeability benefit the subsequent decomposition of the overlying methane hydrate. The new production technique includes three stages utilizing one vertical well, which serves as an injector during the first stage and as a producer in the third stage. First, the CO 2 is injected into the underlying aquifer, then the well is shut down and injected CO 2 is converted into hydrate during the second stage. In the third stage, decomposition of CH 4 hydrate is induced by the depressurization method to estimate gas production potential over 15 years. Lastly, the results reveal that methane production is increased together withmore » simultaneous reduction of concomitant water production compared to production from the Class 2 reservoir using only conventional depressurization.« less

Authors:
 [1];  [2];  [3];  [4]; ORCiD logo [5]
  1. National Energy Technology Lab. (NETL), Morgantown, WV (United States); West Virginia Univ., Morgantown, WV (United States). Department of Chemical Engineering
  2. National Energy Technology Lab. (NETL), Morgantown, WV (United States); West Virginia Univ., Morgantown, WV (United States). Department of Chemical Engineering
  3. West Virginia Univ., Morgantown, WV (United States). Department of Chemical Engineering
  4. National Energy Technology Lab. (NETL), Morgantown, WV (United States)
  5. National Energy Technology Lab. (NETL), Morgantown, WV (United States); AECOM, Pittsburg, PA (United States)
Publication Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1482373
Grant/Contract Number:  
FE0004000
Resource Type:
Accepted Manuscript
Journal Name:
Energy and Fuels
Additional Journal Information:
Journal Volume: 32; Journal Issue: 3; Journal ID: ISSN 0887-0624
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
03 NATURAL GAS; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Sridhara, Prathyusha, Anderson, Brian J., Garapati, Nagasree, Seol, Yongkoo, and Myshakin, Evgeniy M. Novel Technological Approach To Enhance Methane Recovery from Class 2 Hydrate Deposits by Employing CO2 Injection. United States: N. p., 2018. Web. doi:10.1021/acs.energyfuels.7b03441.
Sridhara, Prathyusha, Anderson, Brian J., Garapati, Nagasree, Seol, Yongkoo, & Myshakin, Evgeniy M. Novel Technological Approach To Enhance Methane Recovery from Class 2 Hydrate Deposits by Employing CO2 Injection. United States. doi:10.1021/acs.energyfuels.7b03441.
Sridhara, Prathyusha, Anderson, Brian J., Garapati, Nagasree, Seol, Yongkoo, and Myshakin, Evgeniy M. Mon . "Novel Technological Approach To Enhance Methane Recovery from Class 2 Hydrate Deposits by Employing CO2 Injection". United States. doi:10.1021/acs.energyfuels.7b03441. https://www.osti.gov/servlets/purl/1482373.
@article{osti_1482373,
title = {Novel Technological Approach To Enhance Methane Recovery from Class 2 Hydrate Deposits by Employing CO2 Injection},
author = {Sridhara, Prathyusha and Anderson, Brian J. and Garapati, Nagasree and Seol, Yongkoo and Myshakin, Evgeniy M.},
abstractNote = {Class 2 hydrate accumulations are characterized by the presence of an aquifer underneath hydrate bearing sediment. Gas extraction from of these hydrate deposits is accompanied by release of large volumes of water that decreases gas production rates, imposes additional load on the lifting system and, as a result, degrades economical attractiveness of possible exploitation sites. Here, we study the enhanced methane production from Class 2 hydrate accumulations using the CO2-assisted technique in which the aquifer serves as a target zone for CO2 injection. The heat release associated with the CO2 hydrate formation and reduction of the aquifer’s permeability benefit the subsequent decomposition of the overlying methane hydrate. The new production technique includes three stages utilizing one vertical well, which serves as an injector during the first stage and as a producer in the third stage. First, the CO2 is injected into the underlying aquifer, then the well is shut down and injected CO2 is converted into hydrate during the second stage. In the third stage, decomposition of CH4 hydrate is induced by the depressurization method to estimate gas production potential over 15 years. Lastly, the results reveal that methane production is increased together with simultaneous reduction of concomitant water production compared to production from the Class 2 reservoir using only conventional depressurization.},
doi = {10.1021/acs.energyfuels.7b03441},
journal = {Energy and Fuels},
number = 3,
volume = 32,
place = {United States},
year = {2018},
month = {2}
}

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