produced water and oil, the water is recycled to the steam generation system for economic and environmental reasons. The water then goes through treatment processes, and it is used in a once-through steam generator (OTSG) with additional water (makeup water) to produce steam for the SAGD injectors. At high pressure and temperature conditions, hard SAGD and Blowdown Water Management Issues Steam assisted gravity drainage (SAGD) is an enhanced oil recovery process that uses injected steam to reduce bitumen viscosity and increase oil production. This process generates produced water alongside oil production and recycles the water as much as possible before 'blowdown' is required. WATER TECHNOLOGIES SAGD Produced Water Treatment System Performance Produced Water Hardness In the first ten months of operation, the produced water evaporation system experienced several challenges treating the produced water. The produced water had hardness concentration as high as 70 ppm. The Water Environmental Priority Area Steering Committee invites proposals for membrane demineralization technologies operating above 85⁰C to replace part of or the entire SAGD water treatment train. Two applications, possibly sequential are seen; feed water for once-thru-steam generators (lower quality), and feed water for drum The traditional produced water treatment plant installed to obtain the abovewater quality for a SAGD facility is shown in Figure 1. A HLS or WLS reduces the silica and in certain cases the TH the production of SAGD oil extraction. The use of evaporators has become essential to increase water reuse and to meet water disposal regulations. Based on our 20 years of experience of treating produced water, IDE has created the horizontal evaporator to deliver improved reliability, sustainability and economy to the SAGD industry. Steam-assisted gravity drainage (SAGD) is a thermal in situ heavy oil recovery process that was originally developed by Butler (1991). Butler proposed to use steam injection, coupled with horizontal well technology, to assist the movement of oil to a production well by means of gravitational forces. Steam assisted gravity drainage (SAGD) uses injected steam to reduce bitumen viscosity and increase oil production. SAGD generates produced water alongside oil production, with the water recycled as much as possible before "blowdown" is required. Blowdown purges dissolved solids and organics from the SAGD water balance so they do not a method for treating saline water for sagd operations, comprising a) mixing a saline water stream with a warm steam generator blowdown stream, a warm lime softener regeneration stream, a cold lime softener regeneration stream and/or a fresh water stream in a vessel at a known and constant ratio to form a mixture; b) introducing said mixture into … FIG. 1 shows a method and apparatus 10 of the prior art for treating boiler feedwater in SAGD oil recovery operations, having a produced water stream 30 which emanates from an underground formation 60 from which oil is being recovered using steam assisted gravity drainage (SAGD) methods which employ injection of heated steam typically under pressures in the 8400 to 11,200 kPa range into the a water recovery process for a steam assisted gravity drainage system for a heavy oil recovery facility, the process comprising a flash drum and a flash drum heat exchanger/condenser, wherein the Abstract. There has been a shift away from the use of warm lime softening (WLS) and weak acid cation (W