Glenn Pool Surfactant Flood Pilot Test: Comparison of Laboratory and Observation-Well Data
- J.H. Bae (Chevron Oil Field Research Co.) | C.B. Petrick (Chevron Oil Field Research Co.)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Engineering
- Publication Date
- November 1986
- Document Type
- Journal Paper
- 593 - 603
- 1986. Society of Petroleum Engineers
- 5.7.2 Recovery Factors, 5.3.4 Reduction of Residual Oil Saturation, 2.5.2 Fracturing Materials (Fluids, Proppant), 5.2.1 Phase Behavior and PVT Measurements, 5.2 Reservoir Fluid Dynamics, 4.3.3 Aspaltenes, 4.1.2 Separation and Treating, 4.1.5 Processing Equipment, 4.3.1 Hydrates, 5.4.1 Waterflooding, 5.3.2 Multiphase Flow, 5.4.7 Chemical Flooding Methods (e.g., Polymer, Solvent, Nitrogen, Immiscible CO2, Surfactant, Vapex), 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.6.9 Coring, Fishing, 2.4.3 Sand/Solids Control
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A surfactant flood pilot test was conducted in the William Berryhill lease of the Glenn Pool field, Creek County, OK. The test was conducted in the Upper sand in a 20-acre [8.1-ha], four-inverted-five-spot pattern. The field had been waterflooded and had a residual oil saturation pattern. The field had been waterflooded and had a residual oil saturation of 30% PV. A preflush preceded the surfactant slug, which was specifically formulated for this oil-wet reservoir. There were two observation wells in line between an injector and the central producer. Fluids from the observation well were periodically sampled and analyzed. A large oil bank observed in these wells had an oil cut of 40% or higher. Despite chromatographic separation and changing sulfonate concentration and salinity, ultralow tension was maintained for a long period. The interfacial tension (IFT) behavior involving these variables period. The interfacial tension (IFT) behavior involving these variables was much more complex than expected. It was concluded that the process performance in the field as monitored in the observation wells was as good performance in the field as monitored in the observation wells was as good as expected from laboratory linear core test results.
The Glenn Pool field, discovered in 1905, is located in Creek and Tulsa Counties. A few years after discovery, the field was produced under vacuum, and in the early 1940's, a gas repressuring project began. In the 1950's, waterflooding in the main Glenn Pool was started, and the field is now nearing depletion. The field covers about 18,000 acres [7285 ha], and the cumulative production is estimated to he near 500 X 10 6 bbl [79.5 x 106 MI] of oil.
The surfactant flood pilot test was conducted in the northwestern part of the 160-acre [64.8-ha] William Berryhill lease. This lease has been waterflooded since 1955 and has only one producing well. Fig. I shows the lease location and the test pattern. The test pattern consists of four inverted five-spots comprising 20 acres [8.1 ha]. There were two observation wells (Wells 102 and 104) in the central five-spot pattern located 125 and 200 ft [38.1 and 61.0 ml, respectively, from the injector (Well 75) on line toward the central producer (Well 84). This paper compares the field performance of the process as observed in the observation wells with data obtained process as observed in the observation wells with data obtained from laboratory tests. We do not cover field operations other than those necessary to the understanding of the field performance. Complete interpretation of the field test has performance. Complete interpretation of the field test has not been accomplished yet.
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