Quantifying the Risk of CO2 Leakage Through Wellbores
- Matteo Loizzo (Schlumberger Carbon Services) | Onajomo Akpeki Akemu (Schlumberger Carbon Services) | Laurent Jammes (Schlumberger Carbon Services) | Jean Desroches (Schlumberger Carbon Services) | Salvatore Lombardi (Universitá di Roma) | Aldo Annunziatellis (Universitá di Roma)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- September 2011
- Document Type
- Journal Paper
- 324 - 331
- 2011. Society of Petroleum Engineers
- 1.14 Casing and Cementing, 5.4.6 Thermal Methods
- wellbore integrity, Carbon Capture and Storage, leakage risk, CO2 geological storage, risk management
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- 903 since 2007
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Leakage through new or existing wellbores is considered a major risk for carbon dioxide (CO2) geological storage. Long-term effective containment of CO2 is required, and the presence of millions of suspended or abandoned wells exacerbates the potential risk in mature hydrocarbon provinces. Accurate estimates of risk profiles can support the acceptance of geological storage and the adoption of economically effective risk-prevention and -mitigation measures.
Reliable data about long-term containment of CO2 are almost nonexistent, so wells that exhibit a similar risk profile (such as gas storage, gas production, and steam injection) should be used as a proxy to assess failure rates and consequences for cemented wellbores.
Statistical data about occurrence of leaks and their consequences are analyzed to determine the risk profile of CO2 leaks. A smaller sample of data about leak rates is also analyzed to provide their statistical distribution. Rates and consequences are then compared to try to assess the order of magnitude of major and catastrophic leaks.
Hydrothermal CO2 leaks in natural analogs are also reviewed to compare the distribution of leak rates and the consequences upon health, safety, and environment of CO2 releases to soil and atmosphere.
Analysis of existing data will show that major leaks are likely to occur in less than two wells per 1,000, with the overwhelming majority of CO2 leaks being small and with limited or negligible consequences.
Given their risk profile, CO2 wellbore leaks should be addressed through a routine risk-management approach. Their frequent occurrence requires effective prevention measures, such as understanding leaks and adapting and deploying practices to minimize their occurrence. On the other hand, their low impact ensures maximum effectiveness of mitigation measures, such as monitoring. Because leaks can be detected long before damage ensues, they can be observed to predict their long-term consequences and to plan the most effective intervention without unnecessary immediate operation shutdowns.
In conclusion, the recommended course of action is to focus on risk prevention and early detection. This implies the evolution from a "no-leaks" attitude (even for negligible leak consequences) to one that seeks no damage and relies on tight surveillance.
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Allison, M.L. 2001. The Hutchinson Gas Explosions: Unraveling aGeologic Mystery. Proc., 26th Annual KBA/KIOGA Oil and Gas LawConference, Wichita, Kansas, USA, 10 August, Vol. 1, 3-1-3-29.
Araktingi, R.E., Benefield, M.E., Bessenyei, Z., Coats, K.H.,and Tek, M.R. 1984. Leroy Storage Facility, Uinta County, Wyoming: A CaseHistory of Attempted Gas-Migration Control. J Pet Technol 36 (1): 132-140. SPE-11180-PA. http://dx.doi.org/10.2118/11180-PA.
Bourgoyne, A.T. Jr., Scott, S.L., and Regg, J.B. 1999.Sustained Casing Pressure in Offshore Producing Wells. Paper OTC 11029presented at the Offshore Technology Conference, Houston, 3-6 May. http://dx.doi.org/10.4043/11029-MS.
Carey, J.W., Wigand, M., Chipera, S.J., et al. 2007. Analysis andperformance of oil well cement with 30 years of CO2 exposure from the SACROCUnit, West Texas, USA. Int. J. Greenhouse Gas Control 1(1): 75-85. http://dx.doi.org/10.1016/S1750-5836(06)00004-1.
Chilingar, G.V. and Endres, B. 2005. Environmental hazardsposed by the Los Angeles Basin urban oilfields: an historical perspective oflessons learned. Environ. Geol. 47 (2): 302-317. http://dx.doi.org/10.1007/s00254-004-1159-0.
Deremble, L., Loizzo, M., Huet, B., Lecampion, B., and Quesada, D. 2010. Stability of a leakage pathway in a cemented annulus. Paperpresented at the 10th International Conference on Greenhouse Gas Technologies,Amsterdam, 19-23 September.
Evans, D.J. 2009. A review of underground fuel storage eventsand putting risk into perspective with other areas of the energy supply chain.Geological Society, London, Special Publications 313 (1):173-216. http://dx.doi.org/10.1144/sp313.12.
Evans, W.C., White, L.D., Tuttle, M.L., Kling, G.W., Tanyileke,G., and Michel, R.L. 1994. Six years of change in lake Nyos, Cameroon,yield clues to the past and cautions for the future. Geochem. J. 28 (3): 139-162.
Gasda, S., Nordbotten, J., and Celia, M. 2008.Determining effective wellbore permeability from a field pressure test: anumerical analysis of detection limits. Environ. Geol. 54 (6):1207-1215. http://dx.doi.org/10.1007/s00254-007-0903-7.
Heath, J.E. 2007. Selecting Sites for Geological Sequestration:Wellbore Integrity and Other Criteria. Paper Presentation presented at the EPATechnical Workshop on Geosequestration: Well Construction and MechanicalIntegrity Testing, Albuquerque, New Mexico, USA, 14 March.
Jordan, P.D. and Benson, S.M. 2009. Well blowout rates andconsequences in California Oil and Gas District 4 from 1991 to 2005:implications for geological storage of carbon dioxide. Environ. Geol. 57 (5): 1103-1123. http://dx.doi.org/10.1007/s00254-008-1403-0.
Keeley, D. 2008. Failure rates for underground gas storage:Significance for land use planning assessments. Research Report RR671, Healthand Safety Laboratory, Health and Safety Executive (HSE), Derbyshire, UK(December 2008).
Lecampion, B., Quesada, D., Loizzo, M., Desroches, J.,and Bunger, A. 2010. Interface Delamination as a Controlling Mechanismfor Loss of Well Integrity: Importance for CO2 Injectors. Paper presented atthe 10th International Conference on Greenhouse Gas Technologies, Amsterdam,19-23 September.
Loizzo, M., Lombardi, S., Deremble, L., et al. 2010. MonitoringCO2 migration in an injection well: evidence from MovECBM. Paper presented atthe 10th International Conference on Greenhouse Gas Technologies, Amsterdam,19-23 September.
Marlow, R.S. 1989. Cement Bonding Characteristics in Gas Wells.J Pet Technol 41 (11): 1146-1153. SPE-17121-PA. http://dx.doi.org/10.2118/17121-PA.
Scott, J.B. and Brace, R.L. 1966. Coated Casing-"A Techniquefor Improved Cement Bonding ". API Drilling & Production Practice(1966): 66-043.
Sweatman, R.E., Parker, M.E., and Crookshank, S.L. 2009.Industry Experience With CO2-Enhanced Oil Recovery Technology. Paper SPE 126446presented at the SPE International Conference on CO2 Capture, Storage, andUtilization, San Diego, California, USA, 2-4 November. http://dx.doi.org/10.2118/126446-MS.
Watson, T.L. and Bachu, S. 2009. Evaluation of the Potential for Gas and CO2Leakage Along Wellbores. SPE Drill & Compl 24 (1):115-126. SPE-106817-PA. http://dx.doi.org/10.2118/106817-PA.
Watters, L.T. and Sabins, F.L. 1980. Field Evaluation of Method To ControlGas Flow Following Cementing. Paper SPE 9287 presented at the SPE AnnualTechnical Conference and Exhibition, Dallas, 21-24 September. http://dx.doi.org/10.2118/9287-MS.
Xu, R. and Wojtanowicz, A.K. 2001. Diagnosis of SustainedCasing Pressure from Bleed-off/Buildup Testing Patterns. Paper SPE 67194presented at the SPE Production and Operations Symposium, Oklahoma City,Oklahoma, USA, 24-27 March. http://dx.doi.org/10.2118/67194-MS.