Water Flooding a High Water-Cut Strawn Sand Reservoir
- I.F. Roebuck Jr. (Core Laboratories, Inc.) | Leon L. Crain (Core Laboratories, Inc.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- August 1964
- Document Type
- Journal Paper
- 845 - 850
- 1964. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 4.1.2 Separation and Treating, 5.2 Reservoir Fluid Dynamics, 5.6.2 Core Analysis, 2.4.3 Sand/Solids Control, 5.5.2 Core Analysis, 1.6 Drilling Operations, 5.4.1 Waterflooding, 5.8.5 Oil Sand, Oil Shale, Bitumen, 5.6.4 Drillstem/Well Testing, 4.1.5 Processing Equipment, 6.5.2 Water use, produced water discharge and disposal, 5.1.1 Exploration, Development, Structural Geology, 4.3.4 Scale
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The Baylor County Water flood Unit No. 1 is located in the East Seymour Strawn field, approximately 11 miles east of the city of Seymour, Tex. Production is from a stratigraphic-trap Strawn sand reservoir at an average depth of approximately 4,675 ft, with the reservoir almost completely underlain by water. After seven years of primary production with a partial water-drive mechanism, and with producing water-cut at an average of 75 per cent, the field was unitized and a downdip peripheral water-injection project was installed. This paper discusses the geology, rock and fluid properties, and field producing characteristics. The producing history, before and after the beginning of injection, is presented as are the detailed projections of both primary and water-injection performances and the various factors considered in the design of this successful water-injection program.
The Baylor County Waterflood Unit No. 1, operated by Sheets and Walton Drilling CO. of Breckenridge, Tex., is located in the East Seymour Strawn field, Baylor County, Tex. (Fig. 1). This field is approximately 11 miles east of the city of Seymour in Sections 196, 197, 206 and 207 of the T. and N. O. R. R. Survey. The producing reservoir is a stratigraphic-trap Strawn sandstone of Pennsylvanian age with an active, but limited, aquifer. By July, 1960, when water-injection operations were initiated, oil producing rates had declined to less than 8 B/D/well, and the producing water-cut had increased to an average of 75 per cent. In spite of the adverse geological conditions present with respect to water content and position in the reservoir, unitized water- injection operations have been both economically and technically successful. This paper presents the geological and engineering data and interpretations which led to the application of water- injection operations, and describes the production performance under injection operations.
History and Development
Production in the vicinity of the Baylor County Waterflood Unit No. 1 was discovered in June, 1950, with the completion of the J.J. Lynn, First National Bank of Fort Worth No. 1 well as a Caddo lime producer (Fig. 2). In Sept., 1951, the J.J. Lynn, First National Bank of Bowie No. 1 well was completed as a Strawn sand producer in what was designated as the Seymour Strawn field with a total of 11 producing oil wells. The East Seymour Strawn field was discovered in Sept., 1952, with the completion of the J.J. Lynn, Claude Cowan "H" No. 1 well. By Dec., 1955, a total of 24 Strawn sand oil wells had been completed, 23 of which were in what is now designated as the Baylor County Waterflood Unit No. 1 (i.e., the Cowan "B", "J" and "H" leases, Sections 206 and 207, T. and N. O. R. R. Co. Survey, Baylor County, Tex.).
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