Reservoir Description for a Surfactant/ Polymer Pilot in a Fractured, Oil-Wet Reservoir - North Burbank Unit Tract 97
- J.C. Trantham (Phillips Petroleum Co.) | C.B. Threlkeld (Phillips Petroleum Co.) | H.L. Patterson Jr. (Phillips Petroleum Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- September 1980
- Document Type
- Journal Paper
- 1,647 - 1,656
- 1980. Society of Petroleum Engineers
- 3 Production and Well Operations, 1.2.3 Rock properties, 5.6.4 Drillstem/Well Testing, 1.6.9 Coring, Fishing, 2.5.2 Fracturing Materials (Fluids, Proppant), 5.4.7 Chemical Flooding Methods (e.g., Polymer, Solvent, Nitrogen, Immiscible CO2, Surfactant, Vapex), 5.1 Reservoir Characterisation, 5.2 Reservoir Fluid Dynamics, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 7.4.5 Future of energy/oil and gas, 5.2.1 Phase Behavior and PVT Measurements, 4.3.4 Scale, 5.4.2 Gas Injection Methods, 5.6.5 Tracers, 5.4.1 Waterflooding, 5.5.2 Core Analysis, 2.4.3 Sand/Solids Control
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Synthesis of information from cores, logs, waterflood experience, transient pressure tests, geologic studies, log-inject-log measurements, and tracers was used to provide a coordinated reservoir description for designing and controlling a surfactant/polymer flood in a fractured, oil-wet reservoir under active waterflood.
The North Burbank Unit Tract 97 surfactant/polymer pilot in Osage County, OK, is a cooperative project operated by Phillips Petroleum Co. for 17 working-interest owners, with support from the U.S. DOE. Before the start of continuous injection and production in the pilot pattern in Dec. 1975, a comprehensive reservoir study was conducted, including coring, logging, transient pressure tests, oil saturation measurements, prior waterflood history, and a geologic study. These were supplemented, during preflush injection, by freshwater production behavior and radioactive tracer investigations. This paper reports the results of these studies and their synthesis into a working reservoir description, which has provided the basis for planning and operating the pilot during the past 42 months. Discussion of the pilot performance is presented elsewhere.
General Characteristics of the North Burbank Reservoir
The North Burbank reservoir is a large sand body deposited near the shore of the Cherokee Sea of Pennsylvanian age. Though originally thought to be a series of overlapping offshore bars, recent geologic study shows it to be of fluvial origin. The sand averages 42 ft (12.8 m) in thickness, with a porosity of 16.8% and permeability 50 md. The formation is rather heterogeneous, both vertically and areally. Additional heterogeneity is imparted by a strongly directional east-west jointing, or fracturing, which results in a preferential east-west movement of injected fluids. Another important feature is that the sand is strongly oil-wet.
The pilot reservoir in Tract 97 (Fig. 1) was part of the 1954 phase of waterflood development. Because of the preferential east-west flow, the 20-acre (8.09-ha) pattern was developed as a staggered line drive with like wells in east-west lines. Water breakthrough and oil production response occurred nearly simultaneously at each of the Tract 97 producers, requiring about 8 months on the average. Fig. 2 shows the performance of Well 97-06, a typical response. Careful investigation of well behavior at various points in time from start of injection to peak oil production gave inconclusive results.
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