Evaluation of the Potential for Gas and CO2 Leakage Along Wellbores
- Theresa L. Watson (T.L. Watson & Associates Inc.) | Stefan Bachu (Energy Resources Conservation Board)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- March 2009
- Document Type
- Journal Paper
- 115 - 126
- 2009. Society of Petroleum Engineers
- 2.2.2 Perforating, 1.6.11 Plugging and Abandonment, 5.3.9 Steam Assisted Gravity Drainage, 5.6.1 Open hole/cased hole log analysis, 1.6 Drilling Operations, 2 Well Completion, 4.6 Natural Gas, 6.5.7 Climate Change, 5.4.6 Thermal Methods, 1.14.3 Cement Formulation (Chemistry, Properties), 3 Production and Well Operations, 1.14.4 Cement and Bond Evaluation, 4.2.3 Materials and Corrosion, 7.6.4 Data Mining, 1.2.1 Wellbore integrity, 1.14 Casing and Cementing, 5.1.1 Exploration, Development, Structural Geology
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Implementation of carbon dioxide (CO2) storage in geological media requires a proper assessment of the risk of CO2 leakage from storage sites. Leakage pathways may exist through and along wellbores, which may penetrate or be near to the storage site. One method of assessing the potential for CO2 leakage through wells is by mining databases that usually reside with regulatory agencies. These agencies collect data concerning wellbore construction, oil and gas production, and other regulated issues for existing wells. The Alberta Energy Resources Conservation Board (ERCB), the regulatory agency in Alberta, Canada, collects and stores information about more than 315,000 oil, gas, and injection wells in the province of Alberta. The ERCB also records well leakage at the surface as surface-casing-vent flow (SCVF) through wellbore annuli and gas migration (GM) outside casing, as reported by the industry.
The evaluation of a leakage pathway through wellbore casing or annuli and what causes these wellbore leaks are the first step in determining what factors may contribute to wellbore leakage from CO2-storage sites. By using available data, major factors that contribute to wellbore leakage were identified.
Data analysis shows that there is a correlation between these SCVF/GM and economic activity, technology changes, geographic location, and regulatory changes regarding well completion and abandonment. Further analysis indicates a relationship between low-annular-cement top, external corrosion, casing failure, and wellbore leakage (SCVF/GM). Other factors that could affect the presence of wellbore leakage, such as wellbore deviation, surface-casing depth, and wellbore density, were also investigated.
This paper presents the findings of the data analysis and a method to evaluate the potential for leakage along wells in an area where CO2 storage is intended. This information is useful not only for future operations of CO2 storage in geological media, but also for current operations relating to the exploration and production of hydrocarbons.
|File Size||3 MB||Number of Pages||12|
Bellis, C.J., Bothwell, P.D., Burke, L.H., Grace, R.D., MacDonald, R.R., andMcLellan, P.J. 2004. Design andExecution of a Successful Well Kill on the World's Longest RunningBlow-out. Paper SPE 90542 presented at the SPE Annual Technical Conferenceand Exhibition, Houston, 26-29 September. DOI: 10.2118/90542-MS.
Getzlaf, D., Kattenburg, R., and Watson, T. 2003. Gas migration databasehelps improve vent flow risk assessment. Paper CADE 2003-001 presented at theCADE/CAODS Drilling Conference, Calgary, 20-22 October.
Gonzalo, V., Aiskely, B., and Alicia, C. 2005. A Methodology To Evaluate the GasMigration in Cement Slurries. Paper SPE 94901 presented at the SPE LatinAmerican and Caribbean Petroleum Engineering Conference, Rio de Janeiro, 20-23June. DOI: 10.2118/94901-MS.
ID 2003-01: 1) Isolation Packer Testing, Reporting, and RepairRequirements, 2) Surface casing venting flow/gas migration testing, reporting,and repair requirements, 3) Casing Failure Reporting. 2003. Calgary,Alberta: EUB/ERCB.
Jakobsen, J., Sterri, N., Saasen, A., Aas, B., Kjosnes, I., and Vigen, A.1991. Displacements in EccentricAnnuli During Primary Cementing in Deviated Wells. Paper SPE 21686presented at the SPE Production Operations Symposium, Oklahoma City, Oklahoma,USA, 7-9, April. DOI: 10.2118/21686-MS.
Metz, B., Davidson, O., De Coninck, H.C., Loos, M., and Mayer, L.A., ed.2005. Intergovernmental Panel on Climate Change. IPCC Special Report onCarbon Dioxide Capture and Storage. Cambridge, UK: Cambridge UniversityPress.
Moritis, G. 2006. Special Report: EOR/Heavy Oil Survey. Oil and GasJournal 104 (15): 37-57.
Saskatchewan Research Council (SRC). 1995. Migration of methane intogroundwater from leaking production wells near Lloydminster. CAPP Report1995-001, Canadian Association of Petroleum Producers (CAPP), Calgary, Alberta(March 1995).
Schremp, F. and Roberson, G. 1975. Effect of Supercritical Carbon Dioxide(CO2) on Construction Materials. SPE J. 15 (3) 227-233.SPE-4667-PA. DOI: 10.2118/4667-PA.
Watson, T.L. 2004. Surface casing vent flow repair--A process. Paper CIM2004-297 presented at the 5th Canadian International Petroleum Conference,Calgary, 8-10 June.