Reactive transport modeling to evaluate interactions between pozzolan-amended wellbore cement and acid gas (CO2 + H2S) under typical acid gas sequestration conditions

Liwei Zhang, David A. Dzombak, David V. Nakles, Steven B. Hawthorne, Barbara Kutchko, Christina Lopano, Brian Strazisar, Leopold Brunet, Li Li

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

Abstract

Capture and subsurface co-sequestration of acid gas (H2S and CO2) is one sequestration approach that can reduce the emissions of both CO2 and H2S from combustion of fossil fuel. Before the implementation of acid gas co-sequestration, the potential of acid gas leakage along existing and abandoned wellbores at target sequestration regions needs to be evaluated. Reactive transport modeling is a powerful tool to mimic the interactions between wellbore cement and CO2 + H2S, so as to evaluate the potential of acid gas leakage along existing and abandoned wellbores. In this study, the interactions between pozzolan-amended wellbore cement and acid gas were simulated using the reactive transport modeling program CrunchFlow. Key simulation outputs include, for example, calcite weight percentage, pH, porosity, pyrite weight percentage and ettringite weight percentage from the exterior to the interior of the pozzolan-amended wellbore cement. To validate model simulation outputs, SEM-BSE and SEM-EDS analyses on real pozzolan-amended cement samples exposed to CO2 and H 2S were conducted. Simulation results are consistent with SEM-BSE and SEM-EDS analyses results from real samples. Both model simulation and experimental results show that under the experimental exposure conditions (T = 50°C, P = 151 bar, 21 mole % H2S in 79 mole % CO2 and samples immersed in 1 wt% NaCl solution), the alteration of pozzolan-amended wellbore cement porosity is not significant after 28 days of exposure.

Original languageEnglish (US)
Title of host publicationAIChE 2012 - 2012 AIChE Annual Meeting, Conference Proceedings
StatePublished - 2012
Event2012 AIChE Annual Meeting, AIChE 2012 - Pittsburgh, PA, United States
Duration: Oct 28 2012Nov 2 2012

Other

Other2012 AIChE Annual Meeting, AIChE 2012
CountryUnited States
CityPittsburgh, PA
Period10/28/1211/2/12

Fingerprint

Pozzolan
Cements
Gases
Acids
Scanning electron microscopy
Leakage (fluid)
Energy dispersive spectroscopy
Porosity
Interiors (building)
Calcium Carbonate
Pyrites
Calcite
Fossil fuels

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Zhang, L., Dzombak, D. A., Nakles, D. V., Hawthorne, S. B., Kutchko, B., Lopano, C., ... Li, L. (2012). Reactive transport modeling to evaluate interactions between pozzolan-amended wellbore cement and acid gas (CO2 + H2S) under typical acid gas sequestration conditions. In AIChE 2012 - 2012 AIChE Annual Meeting, Conference Proceedings
Zhang, Liwei ; Dzombak, David A. ; Nakles, David V. ; Hawthorne, Steven B. ; Kutchko, Barbara ; Lopano, Christina ; Strazisar, Brian ; Brunet, Leopold ; Li, Li. / Reactive transport modeling to evaluate interactions between pozzolan-amended wellbore cement and acid gas (CO2 + H2S) under typical acid gas sequestration conditions. AIChE 2012 - 2012 AIChE Annual Meeting, Conference Proceedings. 2012.
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title = "Reactive transport modeling to evaluate interactions between pozzolan-amended wellbore cement and acid gas (CO2 + H2S) under typical acid gas sequestration conditions",
abstract = "Capture and subsurface co-sequestration of acid gas (H2S and CO2) is one sequestration approach that can reduce the emissions of both CO2 and H2S from combustion of fossil fuel. Before the implementation of acid gas co-sequestration, the potential of acid gas leakage along existing and abandoned wellbores at target sequestration regions needs to be evaluated. Reactive transport modeling is a powerful tool to mimic the interactions between wellbore cement and CO2 + H2S, so as to evaluate the potential of acid gas leakage along existing and abandoned wellbores. In this study, the interactions between pozzolan-amended wellbore cement and acid gas were simulated using the reactive transport modeling program CrunchFlow. Key simulation outputs include, for example, calcite weight percentage, pH, porosity, pyrite weight percentage and ettringite weight percentage from the exterior to the interior of the pozzolan-amended wellbore cement. To validate model simulation outputs, SEM-BSE and SEM-EDS analyses on real pozzolan-amended cement samples exposed to CO2 and H 2S were conducted. Simulation results are consistent with SEM-BSE and SEM-EDS analyses results from real samples. Both model simulation and experimental results show that under the experimental exposure conditions (T = 50°C, P = 151 bar, 21 mole {\%} H2S in 79 mole {\%} CO2 and samples immersed in 1 wt{\%} NaCl solution), the alteration of pozzolan-amended wellbore cement porosity is not significant after 28 days of exposure.",
author = "Liwei Zhang and Dzombak, {David A.} and Nakles, {David V.} and Hawthorne, {Steven B.} and Barbara Kutchko and Christina Lopano and Brian Strazisar and Leopold Brunet and Li Li",
year = "2012",
language = "English (US)",
isbn = "9780816910731",
booktitle = "AIChE 2012 - 2012 AIChE Annual Meeting, Conference Proceedings",

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Zhang, L, Dzombak, DA, Nakles, DV, Hawthorne, SB, Kutchko, B, Lopano, C, Strazisar, B, Brunet, L & Li, L 2012, Reactive transport modeling to evaluate interactions between pozzolan-amended wellbore cement and acid gas (CO2 + H2S) under typical acid gas sequestration conditions. in AIChE 2012 - 2012 AIChE Annual Meeting, Conference Proceedings. 2012 AIChE Annual Meeting, AIChE 2012, Pittsburgh, PA, United States, 10/28/12.

Reactive transport modeling to evaluate interactions between pozzolan-amended wellbore cement and acid gas (CO2 + H2S) under typical acid gas sequestration conditions. / Zhang, Liwei; Dzombak, David A.; Nakles, David V.; Hawthorne, Steven B.; Kutchko, Barbara; Lopano, Christina; Strazisar, Brian; Brunet, Leopold; Li, Li.

AIChE 2012 - 2012 AIChE Annual Meeting, Conference Proceedings. 2012.

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

TY - GEN

T1 - Reactive transport modeling to evaluate interactions between pozzolan-amended wellbore cement and acid gas (CO2 + H2S) under typical acid gas sequestration conditions

AU - Zhang, Liwei

AU - Dzombak, David A.

AU - Nakles, David V.

AU - Hawthorne, Steven B.

AU - Kutchko, Barbara

AU - Lopano, Christina

AU - Strazisar, Brian

AU - Brunet, Leopold

AU - Li, Li

PY - 2012

Y1 - 2012

N2 - Capture and subsurface co-sequestration of acid gas (H2S and CO2) is one sequestration approach that can reduce the emissions of both CO2 and H2S from combustion of fossil fuel. Before the implementation of acid gas co-sequestration, the potential of acid gas leakage along existing and abandoned wellbores at target sequestration regions needs to be evaluated. Reactive transport modeling is a powerful tool to mimic the interactions between wellbore cement and CO2 + H2S, so as to evaluate the potential of acid gas leakage along existing and abandoned wellbores. In this study, the interactions between pozzolan-amended wellbore cement and acid gas were simulated using the reactive transport modeling program CrunchFlow. Key simulation outputs include, for example, calcite weight percentage, pH, porosity, pyrite weight percentage and ettringite weight percentage from the exterior to the interior of the pozzolan-amended wellbore cement. To validate model simulation outputs, SEM-BSE and SEM-EDS analyses on real pozzolan-amended cement samples exposed to CO2 and H 2S were conducted. Simulation results are consistent with SEM-BSE and SEM-EDS analyses results from real samples. Both model simulation and experimental results show that under the experimental exposure conditions (T = 50°C, P = 151 bar, 21 mole % H2S in 79 mole % CO2 and samples immersed in 1 wt% NaCl solution), the alteration of pozzolan-amended wellbore cement porosity is not significant after 28 days of exposure.

AB - Capture and subsurface co-sequestration of acid gas (H2S and CO2) is one sequestration approach that can reduce the emissions of both CO2 and H2S from combustion of fossil fuel. Before the implementation of acid gas co-sequestration, the potential of acid gas leakage along existing and abandoned wellbores at target sequestration regions needs to be evaluated. Reactive transport modeling is a powerful tool to mimic the interactions between wellbore cement and CO2 + H2S, so as to evaluate the potential of acid gas leakage along existing and abandoned wellbores. In this study, the interactions between pozzolan-amended wellbore cement and acid gas were simulated using the reactive transport modeling program CrunchFlow. Key simulation outputs include, for example, calcite weight percentage, pH, porosity, pyrite weight percentage and ettringite weight percentage from the exterior to the interior of the pozzolan-amended wellbore cement. To validate model simulation outputs, SEM-BSE and SEM-EDS analyses on real pozzolan-amended cement samples exposed to CO2 and H 2S were conducted. Simulation results are consistent with SEM-BSE and SEM-EDS analyses results from real samples. Both model simulation and experimental results show that under the experimental exposure conditions (T = 50°C, P = 151 bar, 21 mole % H2S in 79 mole % CO2 and samples immersed in 1 wt% NaCl solution), the alteration of pozzolan-amended wellbore cement porosity is not significant after 28 days of exposure.

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M3 - Conference contribution

SN - 9780816910731

BT - AIChE 2012 - 2012 AIChE Annual Meeting, Conference Proceedings

ER -

Zhang L, Dzombak DA, Nakles DV, Hawthorne SB, Kutchko B, Lopano C et al. Reactive transport modeling to evaluate interactions between pozzolan-amended wellbore cement and acid gas (CO2 + H2S) under typical acid gas sequestration conditions. In AIChE 2012 - 2012 AIChE Annual Meeting, Conference Proceedings. 2012