Patent ID: 7967955
Filing Date: 2011-06-28
Classification: C02F,E21B,Y10S

Abstract:
1. A process for treatment of a produced water stream resulting from the production of oil from heavy oil reserves, said produced water stream comprising oil and dissolved solutes including hardness, alkalinity, and silica, wherein said process comprises: (a) removing oil from said produced water to produce a de-oiled produced water stream; (b) evaporation of said de-oiled produced water stream at a concentration factor (CF) of about ten (10) or greater, to produce (i) an evaporator blowdown stream comprising water, dissolved solutes, and precipitates comprising hardness and silica, and, (ii) a distillate stream; (c) providing said distillate stream to a steam generator to generate a steam stream and generating a steam generator blowdown stream.