Performance of a Solution Gas Drive Reservoir, Rosenwald Pool, Oklahoma
- M.R. Smith (Gulf Oil Corp.) | J.H. Henderson (Gulf Research & Development Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- January 1957
- Document Type
- Journal Paper
- 25 - 29
- 1957. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 4.1.9 Tanks and storage systems, 1.2.3 Rock properties, 5.4.1 Waterflooding, 1.6 Drilling Operations, 4.1.5 Processing Equipment, 5.1.1 Exploration, Development, Structural Geology, 2.4.3 Sand/Solids Control, 5.2.1 Phase Behavior and PVT Measurements, 5.7.2 Recovery Factors, 6.6.2 Environmental and Social Impact Assessments, 4.6 Natural Gas
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The Rosenwald pool, Okfuskee County, Okla., was discovered in June, 1949. Production is from the Union Valley limestone and Cromwell sand, both of Pennsylvanian age, at an average depth of about 3,450 ft. The Union Valley lies conformably on the Cromwell with the two formations forming a common reservoir. The pool is a stratigraphic trap with the limits defined by a pinchout of the sand and a loss of permeability in the lime. The pool as fully developed consisted of 31 producers drilled on 10-acre spacing.
All wells flowed upon completion, with initial productions ranging from 40 BOPD for edge wells to as much as 1,600 BOPD where good Cromwell sand development was encountered. Initially only a few feet of sand penetration was taken, for fear of encountering bottom water.
Early in the life of the reservoir, performance calculations were made using Muskat's differential form of the material balance equation for dissolved gas drive reservoirs, in an attempt to predict the future production history of the pool. A kg/ko curve for the performance calculations was constructed from data of other pools which have produced from Cromwell or sands similar in texture to the Cromwell. Subsequently the reservoir has been essentially depleted by primary means, enabling a comparison of the actual performance with that predicted. Actual recovery was 20 per cent of the original oil in place as compared to the prediction of 26½ per cent. Laboratory-determined relative permeability ratios and the assumed ratios used in the performance calculations are compared with those calculated from the field performance.
By the end of 1953 most of the wells had become marginal producers and the pool was unitized and is presently being waterflooded.
The Rosenwald pool has afforded an excellent opportunity to analyze the performance of a solution gas drive reservoir. This relatively small pool was drilled on 10-acre spacing and had an over-all primary producing life of 41½ years. Care was taken throughout the life of the pool to obtain adequate production and engineering data to enable good comparisons of the actual performance with theoretical concepts.
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