Abstract
ABSTRACT A steam-foam pilot project was conducted in the Dome-Tumbador leases, Midway Sunset field. The pilot consisted of four inverted five-spot patterns with a confined producer covering 5.2 acres [2.1 ha]. The injection phase lasted 3.7 years. During this period, steam-foam was generated by continuous injection of steam with NaCl, alpha olefin sodium sulfonate (AOS) and nitrogen. Incremental oil due to foam was 6.0% 00IP. The AOS use was approximately 5.3 lbs [2.4 kg] active matter per barrel of incremental oil. A heat distribution analysis using neutron and temperature logs from two observation wells showed that foam had improved areal and vertical sweeps. Finally, a comparison between in situ foam volumes in Midway Sunset and a similar project conducted by Shell in two Kern River pilots showed that the rate of foam propagation in Midway Sunset is about 4.5 times faster than in Kern River.
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