Progress Report of LPG Injection in the Meadow Creek Unit, Lakota B Reservoir
- L.L. Harbert (Continental Oil Co.) | P.W. Reed (Continental Oil Co.) | R.K. Bray (Continental Oil Co.) | J.N. Dew (Continental Oil Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- July 1959
- Document Type
- Journal Paper
- 26 - 29
- 1959. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 5.2.1 Phase Behavior and PVT Measurements, 5.4.9 Miscible Methods, 2.4.3 Sand/Solids Control, 4.1.5 Processing Equipment, 5.6.4 Drillstem/Well Testing, 5.4.2 Gas Injection Methods, 5.3.2 Multiphase Flow, 4.6 Natural Gas, 4.1.2 Separation and Treating, 4.1.9 Tanks and storage systems, 5.4.1 Waterflooding, 5.1.2 Faults and Fracture Characterisation
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Results of a field test of oil displacement by liquid propane and butane are presented. Since March, 1956, an LPG miscible flood project has been in operation in the Lakota B reservoir, a small reservoir of nine wells located in the Sussex area, Johnson County, Wyo. The Lakota in this reservoir consists of two zones separated by a shale break of 10 to 12 ft. Injection has been into the upper zone only. The average producing depth is 7,350 ft and as of July, 1958, the average bottom-hole pressure at datum (-2,120 ft) was 589 psig. Data on GOR, injected volumes and individual well performance are discussed. During the 28-month period the flood was in operation, 275,000 bbl of propane and butane were injected into two wells, and 72,000 bbl of oil were recovered over normal decline. The reservoir was shut-in July, 1958, to build up pressure to obtain miscibility between LPG and gas.
LPG injection has been carried out in the Meadow Creek Unit, Lakota B upper zone since March, 1956. From March 29, 1956, to July 15, 1958, 275,000 bbl of LPG were injected into the reservoir to recover approximately 72,000 bbl of secondary oil. The purpose was to initiate a field test of miscible displacement, a process which promises to increase oil recovery beyond that obtainable by conventional methods of water flooding and gas injection. The basic process involves the injection of LPG followed by the injection of a gas. A preferred method of operation maintains the pressure in the reservoir above that required for miscibility between the LPG and gas. Operations at a lower pressure, where the oil and LPG are still miscible but the LPG and gas are not, are also possible; however, recoveries comparable to the completely miscible operation require the injection of larger quantities of LPG and gas. In either case, essentially 100 per cent of the oil in place can be recovered in that portion of the reservoir swept by the LPG, although the high pressure operation more efficiently utilizes the relatively expensive LPG.
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