STEAM GENERATION METHOD AND METHOD FOR RECOVERING CRUDE OIL BY STEAM-ASSISTED GRAVITY DRAINAGE (SAGD) INCLUDING SAID STEAM GENERATION METHOD

摘要

The method include (a) compressing the feed water at a low pressure; (b) filtering the feed water; (c) compressing the filtered water stream at a medium pressure; (d) supplying the filtered water stream, compressed at a medium pressure, in the liquid phase of an instant expansion tank; (e) in the tank, heating the stream of step (d) by mixing with the recycled stream (h); (f) compressing again at a high pressure the liquid fraction in the tank and supplying it to the heat exchanger inlet; (g) heating the liquid fraction in the exchanger while maintaining the liquid fraction in the liquid state; (h) recycling the fraction from the step (g) in the tank; and (i) expanding the stream of the step (h) in the expansion tank, generating by instant expansion the searched steam; and (j) separating the solid particles formed as a second blowdown containing water and the particles.

主权项

1. A steam generation method from a feed water containing solid particles in suspension and mineral materials in solution, wherein the method comprises:
(a) compressing said feed water at a low pressure; (b) filtering said feed water in order to obtain:
a filtered water stream, cleared from the solid particles contained in feed water; anda first blowdown containing water and filtered solid particles; (c) compressing the filtered water stream at a medium pressure; (d) directing said filtered water stream, compressed at a medium pressure, in the liquid phase of an instant expansion tank; (e) in said instant expansion tank, heating said stream from step (d) by mixing with the recycled stream from following step (h); (f) compressing again at a high pressure the liquid fraction in said instant expansion tank and sending the liquid fraction to the inlet of a heat exchanger or a group of heat exchangers connected in series; (g) heating the liquid fraction in said heat exchanger(s) while maintaining the liquid fraction in the liquid state; (h) recycling the fraction from step (g) in said instant expansion tank; and (i) in said instant expansion tank, expanding said stream from step (h) and generating by instant expansion the searched steam containing the mineral materials of the feed water which remained in solution; and (j) separating the solid particles formed from:
the precipitation of the mineral materials in solution under the action of temperature and/or pressure in said instant expansion tank; andthe decantation associated with the mineral materials derived from the vaporization in said instant expansion tank; as a second blowdown containing water and said particles.