Prospects of Commercialization, Surfactant/Polymer Flooding, North Burbank Unit, Osage County, OK
- J.C. Trantham (Phillips Petroleum Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- May 1983
- Document Type
- Journal Paper
- 872 - 880
- 1983. Society of Petroleum Engineers
- 5.3.2 Multiphase Flow, 5.4.1 Waterflooding, 2.5.2 Fracturing Materials (Fluids, Proppant), 4.3.4 Scale, 1.6 Drilling Operations, 4.1.5 Processing Equipment, 5.6.9 Production Forecasting, 5.4.7 Chemical Flooding Methods (e.g., Polymer, Solvent, Nitrogen, Immiscible CO2, Surfactant, Vapex)
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The North Burbank Unit Tract 97 surfactant/polymer pilot (Fig. 1) in Osage County, OK (Fig. 1) is a cooperative project operated by Phillips Petroleum Cofor 17 working-interest owners. During a 51-month period the project was supported by the U.S. DOE. All planned phases of the project have been completed except for conversion from fresh to produced drive water, and tertiary oil recovery is continuing. As of Feb. 27, 1981, 221,700 bbl (35 247 m ) of tertiary oil has been recovered from the 90-acre (364 000-m ) pilot, and it is estimated that tertiary oil production will continue at economical rates for 7 more years. Three annual and a final report on the project have been published by the U.S. DOE.
This reservoir is particularly attractive for tertiary recovery because more than 360 MMbbll (57.2x 10 m ) of sweet, 39 deg. API (0.83-g/cm ) oil will remain unrecovered when waterflooding reaches its economic limit (Fig. 1 2). Unfortunately, the reservoir is highly heterogeneous, both inherently and because of a fracture system that must be considered in orientation of the well pattern. It is also strongly oil-wet, requiring that chemical formulations be carefully tailored to its eccentricities.
Evaluation of the pilot has included a series of studies of prospects for commercial expansion, with economic calculations made periodically as changes in the economic climate have taken place over the past 2 years. The information reported here represents the most recent study, which includes sensitivity of the economics to several important factors.
The Tract 97 pilot, shown at the bottom of Fig. 3, consists of an array of nine inverted five-spots totaling approximately 90 acres (364 000 m ). Following the drilling of 9 injection wells, 11 producing wells, and 1 saltwater disposal well, the fluid injection sequence shown in Table 1 was started on Dec. 1, 1975. Response to surfactant injection occurred in Nov. 1976, slightly more than 3 months after injection began (Fig. 4). During the early stages of ternary oil production. the response was greater than original predictions. The production peaked at a considerably lower level than anticipated, however, producing a broad, flat production curve rather than a sharply peaked one. Decline-curve analysis led to a forecasted economic limit of about 7 years, with an ultimate tertiary oil recovery of 285,000 bbl(45 300 m ).
As additional production data have been accumulated. the ultimate tertiary oil recovery has been revised upward to 295,000 bbl (46 900 m3). Currently, cumulative tertiary oil is about 225,000 bbl (35 800 m3). A detailed analysis of the pilot performance has been presented and is beyond the scope of this paper. Additional details of all aspects of the pilot project can be found in the annual reports and in several published papers.
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