NIOSHTIC-2 Publications Search
Open Surface Flotation Method.
U S Pat 4 302 051 1981 Nov; :
A method for the in situ separation of viscous crude oil from a reservoir such as oil shale, oil sand, or tar sand is disclosed. Hot water is introduced at the top surface of the reservoir while steam is injected into the reservoir through drill holes. The hot water and steam may contain a surfactant. The buoyancy of the crude oil creates an artificial water drive which causes the water and oil to flip-flop so that the oil rises to the top of the reservoir and separates from the remainder of the reservoir material. If the overburden is deep, underground mining techniques may be used to reach the reservoir prior to applying the method. (See also U.S. Pat. 4,402,552, Sept. 6, 1983, Which seems to be identical to this patent.)
U.S. Pat. 4,302,051, Nov. 24, 1981; Chem. Abstr. 93:170,945Z
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