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Title: Pressure Monitoring to Detect Fault Rupture Due to CO 2 Injection

Abstract

The capacity for fault systems to be reactivated by fluid injection is well-known. In the context of CO 2 sequestration, however, the consequence of reactivated faults with respect to leakage and monitoring is poorly understood. Using multi-phase fluid flow simulations, this study addresses key questions concerning the likelihood of ruptures, the timing of consequent upward leakage of CO 2, and the effectiveness of pressure monitoring in the reservoir and overlying zones for rupture detection. A range of injection scenarios was simulated using random sampling of uncertain parameters. These include the assumed distance between the injector and the vulnerable fault zone, the critical overpressure required for the fault to rupture, reservoir permeability, and the CO 2 injection rate. We assumed a conservative scenario, in which if at any time during the five-year simulations the critical fault overpressure is exceeded, the fault permeability is assumed to instantaneously increase. For the purposes of conservatism we assume that CO 2 injection continues ‘blindly’ after fault rupture. We show that, despite this assumption, in most cases the CO 2 plume does not reach the base of the ruptured fault after 5 years. As a result, one possible implication of this result is that leak mitigationmore » strategies such as pressure management have a reasonable chance of preventing a CO 2 leak.« less

Authors:
 [1];  [2];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. The Univ. of Aukland, Auckland (New Zealand)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE), Clean Coal and Carbon (FE-20)
OSTI Identifier:
1417169
Report Number(s):
LA-UR-17-28171
Journal ID: ISSN 1876-6102
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Energy Procedia
Additional Journal Information:
Journal Volume: 114; Journal Issue: C; Journal ID: ISSN 1876-6102
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Earth Sciences; leak detection; pressure monitoring; fault rupture

Citation Formats

Keating, Elizabeth, Dempsey, David, and Pawar, Rajesh. Pressure Monitoring to Detect Fault Rupture Due to CO2 Injection. United States: N. p., 2017. Web. doi:10.1016/j.egypro.2017.03.1529.
Keating, Elizabeth, Dempsey, David, & Pawar, Rajesh. Pressure Monitoring to Detect Fault Rupture Due to CO2 Injection. United States. doi:10.1016/j.egypro.2017.03.1529.
Keating, Elizabeth, Dempsey, David, and Pawar, Rajesh. Fri . "Pressure Monitoring to Detect Fault Rupture Due to CO2 Injection". United States. doi:10.1016/j.egypro.2017.03.1529. https://www.osti.gov/servlets/purl/1417169.
@article{osti_1417169,
title = {Pressure Monitoring to Detect Fault Rupture Due to CO2 Injection},
author = {Keating, Elizabeth and Dempsey, David and Pawar, Rajesh},
abstractNote = {The capacity for fault systems to be reactivated by fluid injection is well-known. In the context of CO2 sequestration, however, the consequence of reactivated faults with respect to leakage and monitoring is poorly understood. Using multi-phase fluid flow simulations, this study addresses key questions concerning the likelihood of ruptures, the timing of consequent upward leakage of CO2, and the effectiveness of pressure monitoring in the reservoir and overlying zones for rupture detection. A range of injection scenarios was simulated using random sampling of uncertain parameters. These include the assumed distance between the injector and the vulnerable fault zone, the critical overpressure required for the fault to rupture, reservoir permeability, and the CO2 injection rate. We assumed a conservative scenario, in which if at any time during the five-year simulations the critical fault overpressure is exceeded, the fault permeability is assumed to instantaneously increase. For the purposes of conservatism we assume that CO2 injection continues ‘blindly’ after fault rupture. We show that, despite this assumption, in most cases the CO2 plume does not reach the base of the ruptured fault after 5 years. As a result, one possible implication of this result is that leak mitigation strategies such as pressure management have a reasonable chance of preventing a CO2 leak.},
doi = {10.1016/j.egypro.2017.03.1529},
journal = {Energy Procedia},
number = C,
volume = 114,
place = {United States},
year = {Fri Aug 18 00:00:00 EDT 2017},
month = {Fri Aug 18 00:00:00 EDT 2017}
}

Journal Article:
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