Abstract: Apparatus and methods for simulation of steam flooding oil recovery operations are disclosed. The steam flooding apparatus comprises an elongated chamber to which sand is supplied. The mass, permeability and porosity of the sand is measured. The sand is then flushed and is filled with oil to the degree desired. A steam generator, which is designed so as to eliminate diphasic steam/water conditions while permitting accurate measurement of the quality of the steam and of the mass injected, supplies steam to the chamber. The quality of the steam is carefully recorded, and the pressure within the chamber and the temperature is recorded as a function of time. Steam overflood conditions and the effect of various coinjectants can also be evaluated using the apparatus and techniques according to the invention.

Abstract: Apparatus for mixing a gas, e.g., oxygen, and a liquid, e.g., leach solution, at a downhole location in a well for treating a formation, e.g., in situ leaching of uranium. The apparatus comprises a mixing means which is adapted to be affixed to the lower end of the gas supply conduit and is lowered into and raised out of the well by means of the conduit. The mixing means is comprised of a solid, noncorrosive plate having a central opening into which the gas conduit is secured. The plate has a plurality of additional openings surrounding the central opening and has a gasket thereon to form a seal between the plate and the well bore. Liquid is flowed down the well and passes through the additional openings in the plate. At the same time, gas is supplied through the conduit and flows through the central opening in the plate. Due to the increased velocity of the liquid caused by the liquid as it flows through the additional openings in the plate, the gas is trapped to form a gas pocket below the plate.