The Bureau of Mines conducted oil displacement tests in the laboratory with three water-in-oil and five oil-in-water emulsions that were created with ultrasonic energy at a frequency of 20 khz and acoustic intensity of approximately 100 w/sq. Cm. Emulsions of either crude oil or kerosine, brine, and 1/2 to 2 percent emulsifier were formed during 30 sec of acoustic irradiation. Results indicate that ultrasonic energy induces greater and more uniform dispersion of one liquid in another in the presence of small amounts of chemical emulsifiers. When the emulsions were injected as a buffer slug before waterflooding, recovery of the oil- in-place was 8 to 22 percent greater than with conventional waterflooding in the test specimens, regardless of the continuous phase (oil or brine). The emulsions do not appear to be applicable to the Appalachian area however, because the oilfields are too tight, the clays in the formation remove the emulsifier from the displacing fluid, and not enough additional oil is produced, compared with recovery with conventional waterflooding, to warrant the increased operating costs.