FIELD: soil or rock drilling; mining.
SUBSTANCE: group of inventions relates to the treatment of produced water. Oil recovery process comprises steps of: a) producing steam; b) injecting the steam into a formation comprising oil; c) withdrawing a mixture of water and oil from the formation; d) separating produced water from the mixture of water and oil; e) treating the produced water in an evaporator to produce an evaporator effluent; e) treating the evaporator effluent in a crystalliser to produce a distillate and a concentrate, the concentrate being a slurry containing one or more salts and one or more organic compounds; g) using the distillate to obtain an additional amount of steam for pumping into the formation; h) mixing the solvent of said one or more organic compounds with the slurry; i) after performing step (h) separating the precipitated solids comprising one or more salts from the mixture.
EFFECT: technical result is the improvement of the quality of treating produced water, the possibility of re-use in a heavy oil recovery system.
31 cl, 1 dwg
