초록 ▼

Process intended for enhanced recovery of a petroleum fluid by combined injection of an aqueous phase saturated with acid gases. The process esentially consists in continuously injecting, into the oil reservoir, a mixture of an aqueous phase and of a gas at least partially soluble in the aqueous pha

Process intended for enhanced recovery of a petroleum fluid by combined injection of an aqueous phase saturated with acid gases. The process esentially consists in continuously injecting, into the oil reservoir, a mixture of an aqueous phase and of a gas at least partially soluble in the aqueous phase and at least partially miscible with the petroleum fluid, by controlling the ratio of the flow rates of the aqueous phase and of the gas so that the latter is always in a state of saturation or oversaturation at the bottom of the injection well(s). The aqueous phase saturated or oversaturated with gas comes into contact with the petroleum fluid present in the reservoir. The gas dissolved in the aqueous phase is at least partially transferred to the liquid hydrocarbon phase, thus causing swelling and viscosity reduction of this phase, which favors migration of the petroleum fluid towards a production zone. Acid fractions of effluents coming from the subsoil or from chemical or thermal industries are preferably used as such gases. The process can be applied for an enhanced recovery of hydrocarbons in reservoirs.

대표청구항 ▼

[ What is claimed is:] [1.]1. A process for enhanced recovery of a petroleum fluid produced by a reservoir, comprising continuously injecting a sweep fluid into the reservoir, through an injection well (IW), the sweep fluid comprising water mixed with gas at least partially miscible in the water and

[ What is claimed is:] [1.]1. A process for enhanced recovery of a petroleum fluid produced by a reservoir, comprising continuously injecting a sweep fluid into the reservoir, through an injection well (IW), the sweep fluid comprising water mixed with gas at least partially miscible in the water and in the petroleum fluid, and permanently controlling, at the injection well head, the ratio of the flow rates of the water and of the gas forming the sweep fluid so that the gas is in a state of saturation or of oversaturation therein at the bottom of the injection well. [18.]18. A system intended for enhanced recovery of a petroleum fluid extracted from a reservoir, by continuous injection into the reservoir of a sweep fluid comprising an aqueous phase mixed with a gas at least partially miscible in this aqueous phase and in the petroleum fluid, comprising a sweep fluid conditioning unit and a control unit allowing permanent control of the conditioning unit, suited to control the ratio of the flow rates of the aqueous phase and of the gas forming the sweep fluid at the well bottom, so that the gas is in a state of saturation or oversaturation therein.19. An enhanced recovery system as claimed in claim 18, characterized in that it comprises state detectors in the injection zone, intended to measure thermodynamic parameters and connected to control unit.