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Title: CO 2 utilization and storage in shale gas reservoirs: Experimental results and economic impacts

Abstract

Natural gas is considered a cleaner and lower-emission fuel than coal, and its high abundance from advanced drilling techniques has positioned natural gas as a major alternative energy source for the U.S. However, each ton of CO 2 emitted from any type of fossil fuel combustion will continue to increase global atmospheric concentrations. One unique approach to reducing anthropogenic CO 2 emissions involves coupling CO 2 based enhanced gas recovery (EGR) operations in depleted shale gas reservoirs with long-term CO 2 storage operations. In this paper, we report unique findings about the interactions between important shale minerals and sorbing gases (CH 4 and CO 2) and associated economic consequences. Where enhanced condensation of CO 2 followed by desorption on clay surface is observed under supercritical conditions, a linear sorption profile emerges for CH 4. Volumetric changes to montmorillonites occur during exposure to CO 2. Theory-based simulations identify interactions with interlayer cations as energetically favorable for CO 2 intercalation. Thus, experimental evidence suggests CH 4 does not occupy the interlayer and has only the propensity for surface adsorption. Mixed CH 4:CO 2 gas systems, where CH 4 concentrations prevail, indicate preferential CO 2 sorption as determined by in situ infrared spectroscopymore » and X-ray diffraction techniques. Collectively, these laboratory studies combined with a cost-based economic analysis provide a basis for identifying favorable CO 2-EOR opportunities in previously fractured shale gas reservoirs approaching final stages of primary gas production. Moreover, utilization of site-specific laboratory measurements in reservoir simulators provides insight into optimum injection strategies for maximizing CH 4/CO 2 exchange rates to obtain peak natural gas production.« less

Authors:
 [1];  [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Univ. of Wyoming, Laramie, WY (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1223423
Report Number(s):
PNNL-SA-105772
Journal ID: ISSN 1876-6102; AA7020000
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Energy Procedia
Additional Journal Information:
Journal Volume: 63; Journal ID: ISSN 1876-6102
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
03 NATURAL GAS; 54 ENVIRONMENTAL SCIENCES; carbon sequestration; clay minerals; wet supercritical carbon dioxide

Citation Formats

Schaef, Herbert T., Davidson, Casie L., Owen, Antionette Toni, Miller, Quin R. S., Loring, John S., Thompson, Christopher J., Bacon, Diana H., Glezakou, Vassiliki Alexandra, and McGrail, B. Peter. CO2 utilization and storage in shale gas reservoirs: Experimental results and economic impacts. United States: N. p., 2014. Web. doi:10.1016/j.egypro.2014.11.819.
Schaef, Herbert T., Davidson, Casie L., Owen, Antionette Toni, Miller, Quin R. S., Loring, John S., Thompson, Christopher J., Bacon, Diana H., Glezakou, Vassiliki Alexandra, & McGrail, B. Peter. CO2 utilization and storage in shale gas reservoirs: Experimental results and economic impacts. United States. doi:10.1016/j.egypro.2014.11.819.
Schaef, Herbert T., Davidson, Casie L., Owen, Antionette Toni, Miller, Quin R. S., Loring, John S., Thompson, Christopher J., Bacon, Diana H., Glezakou, Vassiliki Alexandra, and McGrail, B. Peter. Wed . "CO2 utilization and storage in shale gas reservoirs: Experimental results and economic impacts". United States. doi:10.1016/j.egypro.2014.11.819. https://www.osti.gov/servlets/purl/1223423.
@article{osti_1223423,
title = {CO2 utilization and storage in shale gas reservoirs: Experimental results and economic impacts},
author = {Schaef, Herbert T. and Davidson, Casie L. and Owen, Antionette Toni and Miller, Quin R. S. and Loring, John S. and Thompson, Christopher J. and Bacon, Diana H. and Glezakou, Vassiliki Alexandra and McGrail, B. Peter},
abstractNote = {Natural gas is considered a cleaner and lower-emission fuel than coal, and its high abundance from advanced drilling techniques has positioned natural gas as a major alternative energy source for the U.S. However, each ton of CO2 emitted from any type of fossil fuel combustion will continue to increase global atmospheric concentrations. One unique approach to reducing anthropogenic CO2 emissions involves coupling CO2 based enhanced gas recovery (EGR) operations in depleted shale gas reservoirs with long-term CO2 storage operations. In this paper, we report unique findings about the interactions between important shale minerals and sorbing gases (CH4 and CO2) and associated economic consequences. Where enhanced condensation of CO2 followed by desorption on clay surface is observed under supercritical conditions, a linear sorption profile emerges for CH4. Volumetric changes to montmorillonites occur during exposure to CO2. Theory-based simulations identify interactions with interlayer cations as energetically favorable for CO2 intercalation. Thus, experimental evidence suggests CH4 does not occupy the interlayer and has only the propensity for surface adsorption. Mixed CH4:CO2 gas systems, where CH4 concentrations prevail, indicate preferential CO2 sorption as determined by in situ infrared spectroscopy and X-ray diffraction techniques. Collectively, these laboratory studies combined with a cost-based economic analysis provide a basis for identifying favorable CO2-EOR opportunities in previously fractured shale gas reservoirs approaching final stages of primary gas production. Moreover, utilization of site-specific laboratory measurements in reservoir simulators provides insight into optimum injection strategies for maximizing CH4/CO2 exchange rates to obtain peak natural gas production.},
doi = {10.1016/j.egypro.2014.11.819},
journal = {Energy Procedia},
number = ,
volume = 63,
place = {United States},
year = {2014},
month = {12}
}

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