Method of enhanced hydrocarbon production by injection of a liquid and gaseous phase at least partially miscible with water

摘要

A permanent control at the wellhead controls the flow rates of the aqueous phase and the gas forming the balancing fluid so gas is saturated or supersaturated at the bottom of the injection shaft The petroleum fluid is recovered by continuous injection into the deposit through an injector (IW) of a balancing fluid mad water with a gas added to it which is at least partially miscible with an aqueous phase and in the petroleum fluid. The balancin fluid is formed by mixing the aqueous phase with the gas at the bottom or the top of the injection shaft. A means of control pla in the shaft is used to increase the rate of dissolution of the gas in the aqueous phase and/or a packing is placed in the injec shaft to ensure the thorough mixing of the gas and the aqueous phase and/or a multi-phase pump is used to mix the gas and the aqueous phase. Data from detectors at the bottom of the shaft are used to control the flow so the gas is saturated. The gas cont an acid gas such as carbon dioxide or hydrogen sulfide. At least one treatment device is used to extract the effluents from the deposit, including at least part of the balancing fluid. At least part of the gaseous effluent from a thermal or chemical unit i used to form at least part of the gas, and the water from the deposit is used as all or part of the aqueous phase. A tensioactiv additive is added to the aqueous phase to improve the gas dispersion and/or an additive is added to the aqueous phase to improve gas solubility. Carbonized water is injected into shafts which are substantially sloped, horizontal or with complex geometry. Th petroleum fluid is recovered using a devious or complex shaft. Each shaft is local to the top of the deposit.