Casabe Mature-Field Revitalization Through an Alliance: A Case Study of Multicompany and Multidiscipline Integration
- Dennis Denney (JPT Senior Technology Editor)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- January 2010
- Document Type
- Journal Paper
- 52 - 53
- 2010. Society of Petroleum Engineers
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- 152 since 2007
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This article, written by Senior Technology Editor Dennis Denney, contains highlights of paper SPE 122874, "Casabe Mature-Field Revitalization Through an Alliance: A Case Study of Multicompany and Multidiscipline Integration," by L. Marquez, SPE, J. Elphick, SPE, and J. Peralta, Schlumberger, and M. Amaya and E. Lozano, Ecopetrol S.A., prepared for the 2009 SPE Latin American and Caribbean Petroleum Engineering Conference, Cartagena, Colombia, 31 May-3 June. The paper has not been peer reviewed.
The achievements of an alliance between Ecopetrol S.A. and Schlumberger to revitalize the Casabe field, a mature field in Colombia, are highlighted. Challenges were multifaceted in this mature complex field. Some related to the heterogeneous nature of the reservoirs, limited sand continuity, unfavorable mobility for the ongoing waterfloods, associated sand production, and wells lost because of collapses.
The Casabe field, discovered by Shell in 1941, is in the Mid-Magdalena Valley basin in Colombia and contains 1,120 wells. Cumulative production was 284 million bbl of oil as of December 2007. The productive-formation depths range from 2,200 to 5,500 ft. The production peaked at 46,000 BOPD in 1953 and achieved a primary recovery factor of 13% under natural mechanisms. Since 1985, the field has been under waterflood, which increased recovery to 19.8%. Waterflooding has been a challenge because of the very heterogeneous nature of the reservoirs, sand-continuity complexity, oil viscosity, sand production, and wells lost to collapses.
Since 2004, the alliance has worked to revitalize this mature field to increase its value by use of field management. A joint team was assembled to determine key factors related to the past behavior. This method provided the best way to improve future management practices and increase production. Key factors to be managed in the Casabe field are the waterflooding behavior, casing-collapse mechanisms, and sand-production problems. The team developed analytical and numerical models to understand these issues. Some of the models were complemented with laboratory analyses along with well tests. All areas are integrated within the reservoir-management philosophy, which means they are all interrelated.
Casabe Field: History vs. Future
Initially, the Casabe field was under-saturated and produced under primary mechanisms (mainly natural depletion) until the mid-1980s when a waterflood was initiated. Most of the gas had already been produced, and oil rates were down to 10 BOPD/well. The waterflood tripled the per-well oil production, but many inefficiencies remained, which made it difficult to obtain better performance.
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