Water treatment method for heavy oil production
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IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-001/28
B01D-003/42
C02F-001/04
C02F-009/00
출원번호
US-0566622
(2000-05-08)
발명자
/ 주소
Heins, William F.
출원인 / 주소
Ionics, Inc.
대리인 / 주소
Goodloe, Jr., R. Reams
인용정보
피인용 횟수 :
112인용 특허 :
43
초록▼
A method of treating produced water from heavy oil production to provide feedwater for the production of high quality steam. A produced water from heavy oil recovery operations is initially treated by first removing oil and grease to a desired level, preferably to about twenty parts per million, or
A method of treating produced water from heavy oil production to provide feedwater for the production of high quality steam. A produced water from heavy oil recovery operations is initially treated by first removing oil and grease to a desired level, preferably to about twenty parts per million, or less. The pH is then adjusted, normally downward and by acid addition, to release at least some carbonate alkalinity as free carbon dioxide. Preferably, all non-hydroxide alkalinity is removed, or substantially so, by introducing the feedwater into a decarbonator. In some cases, the pH may be raised (without, or subsequent to decarbonation, depending upon water chemistry) preferably by caustic addition, to maintain silica solubility in the feedwater. Next the feedwater is introduced into an evaporator, and the feedwater is evaporated to a pre-selected concentration factor to produce (1) a distillate having a small amount of residual hardness therein, and (2) a concentrate containing residual solids (dissolved solids and in some cases, suspended solids). The distillate is then cooled, and is subsequently introduced into a hardness removal step, preferably an electrodeionization (EDI) treatment unit, to remove the residual hardness from the distillate. Finally, the substantially hardness free treated water stream is sent to packaged boilers, for production of high quality steam. The hardness containing stream from EDI is recycled to the evaporator feed, for further treatment.
대표청구항▼
A method of treating produced water from heavy oil production to provide feedwater for the production of high quality steam. A produced water from heavy oil recovery operations is initially treated by first removing oil and grease to a desired level, preferably to about twenty parts per million, or
A method of treating produced water from heavy oil production to provide feedwater for the production of high quality steam. A produced water from heavy oil recovery operations is initially treated by first removing oil and grease to a desired level, preferably to about twenty parts per million, or less. The pH is then adjusted, normally downward and by acid addition, to release at least some carbonate alkalinity as free carbon dioxide. Preferably, all non-hydroxide alkalinity is removed, or substantially so, by introducing the feedwater into a decarbonator. In some cases, the pH may be raised (without, or subsequent to decarbonation, depending upon water chemistry) preferably by caustic addition, to maintain silica solubility in the feedwater. Next the feedwater is introduced into an evaporator, and the feedwater is evaporated to a pre-selected concentration factor to produce (1) a distillate having a small amount of residual hardness therein, and (2) a concentrate containing residual solids (dissolved solids and in some cases, suspended solids). The distillate is then cooled, and is subsequently introduced into a hardness removal step, preferably an electrodeionization (EDI) treatment unit, to remove the residual hardness from the distillate. Finally, the substantially hardness free treated water stream is sent to packaged boilers, for production of high quality steam. The hardness containing stream from EDI is recycled to the evaporator feed, for further treatment. rein the change in the production of the web formation apparatus initiates a regulation system of the approach system, which regulation system essentially simultaneously checks a need for changing an operational mode of the mixing pump, initiates a change of the operational mode of the mixing pump according to said need, and both guides and regulates a head box feed pump, wherein in a grade change situation, a capacity of the mixing pump and a capacity of the feed pump are changed in a stepwise manner. 17. A method of controlling, the operation of an approach system of a web formation apparatus, in which said method comprises: a. forming a pulp from white water, fiber suspension and fillers, b. feeding said gulp by a mixing pump into a gas separation tank, c. separating gas from said pulp in the gas separation tank, to yield reduced gas pulp, d. feeding the reduced gas pulp into a head box of the web formation apparatus, e. changing the feed of the reduced gas pulp to the head box as production changes in the web formation apparatus, wherein the change in the production of the web formation apparatus initiates a regulation system of the approach system, which regulation system essentially simultaneously checks a need for changing an operational mode of the mixing pump, initiates a change of the operational mode of the mixing pump according to said need, and both guides and regulates a head box feed pump, wherein the regulation system of the approach system controls both a pressure of the head box and a surface level of the gas separation tank and wherein said surface level regulation is controlled by means of fuzzy logic. 18. A method to provide and regulate pulp flowing through an approach system to a web formation apparatus comprising: a. forming the pulp from white water, fiber suspension and fillers, b. feeding the pulp by a mixing pump into a gas separation tank, c. separating gas from the pulp in the tank to pro
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