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• W2034154414 abstract "Before initiation of a CO2 tertiary recovery project, a residual oil saturation study was conducted in the deep, hot, pilot reservoir. The paper discusses the many technical problems that had to be resolved before and during the study. The problems confronted are outlined so that the procedure can be used much like a cookbook in designing future studies in similar reservoirs. Introduction With the advent of increased oil prices, tertiary recovery techniques are becoming more economically attractive. The necessity for residual oil saturation measurements will become more common since these numbers are mandatory in defining the profitability of any tertiary project. Routine procedures to measure this saturation in situ become necessary. However, we are dealing with such a delicate system that the details of planning such an operation become very involved.In 1978 Shell Oil Co., in conjunction with the U.S. DOE, conducted a residual oil saturation study in a deep, hot, high-pressured U.S. gulf coast reservoir. The work was conducted before initiation of a CO2 tertiary recovery pilot.Primary discussion in this paper centers around planning and results of a log-inject-log (LIL) operation used as a prime method to determine the residual oil saturation. Several independent methods were used to calculate the residual oil saturation in the subject well in an interval between 12,910 and 12,920 ft (3935 and 3938 m). In general, these numbers were in good agreement and indicated a residual oil saturation between 22 and 24%.A free-gas saturation was measured in the residual oil saturated interval. This saturation may well be typical of U.S. gulf coast reservoirs that are below the original bubble point at the time tertiary recovery is initiated. As a result, residual oil saturation typically may be less than those values determined by flood pot or countercurrent imbibition tests run in the laboratory. Likewise, residual saturations conventionally measured by openhole resistivity and porosity logs may be residual hydrocarbon and not residual oil saturations.The test was conducted in the S Sand Reservoir B (SRB), a 12,800-ft (3901-m) deep U.S. gulf coast reservoir in Weeks Island field, Iberia Parish, LA. The project setting is depicted in Fig. 1. The SRB initially contained two oil columns with more than 3 million bbl (476,700 m3) of in-place oil. Virtually all of this was in the pilot area. Before initiation of the tertiary project, the SRB had been flooded with fresh water. The remaining oil column had been produced to an estimated thickness of 23 ft (7 m). The 900 acre-ft (1 110 140 m3) of the SRB we propose to displace should contain a minimum of 258,000 bbl (40 996 m3) of water-drive residual oil. If the process is proved successful in the SRB, other major watered-out reservoirs in Weeks Island field have an estimated tertiary potential of 26 million bbl (4 131 400 m3) of oil which could be recovered by CO2 displacement. JPT P. 1999＾" @default.
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• W2034154414 date "1980-11-01" @default.
• W2034154414 modified "2023-09-27" @default.
• W2034154414 title "A Recipe for Residual Oil Saturation Determination" @default.
• W2034154414 doi "https://doi.org/10.2118/8451-pa" @default.
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