Treatment of OTSG blowdown
AssigneeConocoPhillips Company
InventorsRamesh Sharma, Travis Dinsdale, Amber J. Taylor, Babajide Kolade, Jay Locklear
Life of this patent
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Abstract
A method and system generate steam for SAGD operation wherein steam generator blowdown water is acidified, cooled and clarified before reuse. Acid Clarification Treatment, or “ACT”, mitigates organic fouling in Once-Through Stream Generators. Lab tests quantitatively and qualitatively show that ACT reduces Total organic carbon (TOC) and ‘bad actors’ TOC, respectively, in blowdown streams.
Claims14
A steam generator system for oil production, comprising:
- a) an once through steam generator (OTSG) having a feedwater line for inputting feedwater into said OTSG, said OTSG capable of generating steam and blowdown water;
- b) a separator for separating said steam and said blowdown water;
- c) an acid supply tank for acidifying said blowdown water;
- d) a settling tank for clarifying acidic blowdown water;
- e) a clarified blowdown water line for feeding said clarified blowdown water to said feedwater line;
- f) wherein elements a through e are fluidly connected.
A steam generator system for oil production, said system comprising:
- a) an economizer section where feed water is preheated with a hot combustion gas to form preheated feed water;
- b) said economizer section fluidly connected to a radiant section wherein preheated feed water is further heated by a furnace to form steam and blowdown water;
- c) said radiant section fluidly connected to a liquid-steam separator wherein said steam is separated from said blowdown water;
- d) said liquid-steam separator fluidly connected to a steam injection line for injecting steam into a well;
- e) said liquid-steam separator fluidly connected to an acid treatment tank for receiving said blowdown water;
- f) said acid treatment tank fluidly connected to an acid supply to acidify said blowdown water to form acidified blowdown water;
- g) said acid treatment tank fluidly connected to a settling unit for clarifying acidified blowdown water to form clarified blowdown water;
- h) said settling tank unit fluidly connected at an upper level thereof to a feedwater line for inputting clarified blowdown water into said economizer section.
A steam generator system for oil production, said system comprising:
- a) a first feedline for feeding clean water to an economizer section;
- b) said economizer section where feed water is preheated with a hot combustion gas to form preheated feed water;
- c) said economizer section fluidly connected to a radiant section wherein preheated feed water is further heated by a furnace to form steam and blowdown water;
- d) said radiant section fluidly connected to a liquid-steam separator wherein said steam is separated from said blowdown water;
- e) said liquid-steam separator fluidly connected to a steam injection line for injecting steam into a well;
- f) said liquid-steam separator fluidly connected to an acid treatment tank for receiving said blowdown water;
- g) said acid treatment tank fluidly connected to an acid supply to acidify said blowdown water to form acidified blowdown water;
- h) said acid treatment tank fluidly connected to a settling unit for clarifying acidified blowdown water to form clarified blowdown water;
- i) said settling unit fluidly connected at an upper level thereof to a warm lime softening unit for removing hardness from said clarified blowdown water to form softened blowdown water;
- j) said warm lime softening unit fluidly connected to said first feedwater line or a second feedwater line for feeding softened blowdown water into said economizer section.
Dependencies are inferred from the claim text.