CN102518416A - Thickened oil thermal recovery water treatment method and system - Google Patents
Thickened oil thermal recovery water treatment method and system Download PDFInfo
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- CN102518416A CN102518416A CN201110421019XA CN201110421019A CN102518416A CN 102518416 A CN102518416 A CN 102518416A CN 201110421019X A CN201110421019X A CN 201110421019XA CN 201110421019 A CN201110421019 A CN 201110421019A CN 102518416 A CN102518416 A CN 102518416A
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Abstract
The invention relates to a thickened oil thermal recovery water treatment method. The thickened oil thermal recovery water treatment method includes steps of arranging a primary heat exchange device and a secondary heat exchange device between a thermal recovery water source and water treatment equipment; leading water of the thermal recovery water source and water treated by the water treatment equipment to entering the primary heat exchange device to realize heat exchange; leading water, which flows out from the primary heat exchange device, of the thermal recovery water source and cooling water to enter the secondary heat exchange device to realize further heat exchange, and then leading water, which flows out from the secondary heat exchange device, of the thermal recovery water source to enter the water treatment equipment to realize water treatment; and leading water which flows out from the primary heat exchange device and is treated by the water treatment equipment to enter thermal recovery injection equipment. The invention further relates to a thickened oil thermal recovery water treatment system. The thickened oil thermal recovery water treatment method and the system can remarkably increase system thermal energy and efficiency.
Description
Technical field
The present invention relates to a kind of heavy crude heat extraction method for treating water and system, particularly marine heavy crude heat extraction is with method for treating water and system.
Background technology
In recent years, the heavy crude heat extraction technology progressively at sea the oil field carry out application.Carry out and run into some little challenges in the process improving marine thermal recovery process matched therewith.The thermal recovery injection device has harsh requirement to the water quality that gets into; The water that promptly gets into must reach certain water quality standard and could allow to get into the thermal recovery injection device, so supply water just for the thermal recovery injection device after must using water treatment facilities that processing is desalinated at the thermal recovery water source.
Present marine thermal recovery water source supply has four kinds of selections, and the one, tugboat supplies water, and the 2nd, desalinization, the 3rd, oilfield sewage purified treatment, the 4th, oil field GEOTHERMAL WATER.Wherein tugboat supplies water through simple purified treatment, just can satisfy thermal recovery injection device water quality requirement, do not need the main equipment investment, but transportation is inconvenient, and expensive increases the thermal recovery operating cost; The sea water desalting equipment floor space is big, and equipment investment and maintenance cost are very high; The oilfield sewage purification process technique is complicated, and the water after the processing generally is difficult to satisfy thermal recovery injection device water quality requirement.A kind of floor space of offshore platform needs is little, expense reasonable, the thermal recovery water treatment technology of safety and steady, and therefore, marine thermal recovery generally selects the oil field GEOTHERMAL WATER as thermal recovery equipment water water source.
It is light that yet at present advanced water treatment facilities adopt film to separate system, and the water temperature at the thermal recovery water source that needs are handled has certain requirement (coolant-temperature gage at thermal recovery water source necessary＜40 ℃), if thermal recovery water source temperature is too high, water treatment facilities can't normally carry out water treatment.And at present the water source of the GEOTHERMAL WATER of offshore oilfield generally speaking all >=80 ℃, therefore need cool off and make its temperature＜40 ℃ ability use water treatment facilities that it is desalinated processing GEOTHERMAL WATER.Prior art generally adopts cooling tower, reduces thermal recovery water source temperature, makes it reach the temperature requirement of water treatment facilities to water inlet, but has caused the waste of heat energy, simultaneously because the water treatment link has reduced the coolant-temperature gage that gets into the thermal recovery injection device.Because the thermal recovery injection device is to utilize heat that fuel combustion sends the cold water that gets into to be heated into the equipment of high-temperature-hot-water/steam; The water temperature direct relation of the cold water that gets into the injectability of thermal recovery injection device; Therefore, get into the reduction of the coolant-temperature gage of thermal recovery injection device, the injection device injection rate is reduced; Construction period prolongs, and has reduced the heat energy and the efficient of system.
Thereby at sea thermal recovery technology improves in the process, exists a kind of like this contradiction; One side need reduce the temperature at thermal recovery water source, and to satisfy the requirement of water treatment facilities to water temperature, this process has caused a kind of waste of heat energy; And another side need avoid the temperature at thermal recovery water source to reduce; Keep high temperature to get into the thermal recovery injection device as far as possible, improve the injection rate of thermal recovery injection device, while reduction of erection time is the fuel savings cost also.
Therefore, need a kind of improved heavy crude heat extraction to solve above contradiction with method for treating water and system.
Summary of the invention
The purpose of this invention is to provide a kind of heavy crude heat extraction and use method for treating water.
Another object of the present invention provides a kind of heavy crude heat extraction water processing system.
Heavy crude heat extraction provided by the invention is used method for treating water, comprises the steps:
Step 1: one-level heat-exchange device and secondary heat-exchange device are set between thermal recovery water source and water treatment facilities;
Step 2: the water at said thermal recovery water source and the water after said water treatment facilities are handled are got in the said one-level heat-exchange device, carry out interchange of heat;
Step 3: make from the water at the said thermal recovery water source that said one-level heat-exchange device comes out to get into the said secondary heat-exchange device; Further carry out interchange of heat; Make then from the water at the said thermal recovery water source that said secondary heat-exchange device comes out to get into the said water treatment facilities, carry out water treatment; And, the water after said water treatment facilities are handled that comes out from said one-level heat-exchange device is got into the thermal recovery injection device.
Heavy crude heat extraction of the present invention can further comprise the steps: with method for treating water
Repeating step 2 and step 3 are constantly to supply water in said water treatment facilities and said thermal recovery injection device.
Heavy crude heat extraction of the present invention is with in the method for treating water, and said thermal recovery water source can be GEOTHERMAL WATER water source, oil field, and its temperature is more than or equal to 80 ℃.In step 3; The water at said thermal recovery water source can carry out further interchange of heat with cooling water (like seawater) in said secondary heat-exchange device, the temperature from the water at the said thermal recovery water source that said secondary heat-exchange device comes out can further be reduced to less than 40 ℃ then.In step 3, the temperature of the water after said water treatment facilities are handled that comes out from said one-level heat-exchange device can be more than or equal to 50 ℃.
Heavy crude heat extraction water processing system provided by the invention comprises thermal recovery water source, water treatment facilities and thermal recovery injection device; Between thermal recovery water source and water treatment facilities, also be provided with one-level heat-exchange device and secondary heat-exchange device; Said thermal recovery water source, one-level heat-exchange device, secondary heat-exchange device link to each other with water treatment facilities successively; And an end of said one-level heat-exchange device links to each other with the water out of said water treatment facilities, and the other end links to each other with the water inlet of said thermal recovery injection device.
In heavy crude heat extraction water processing system provided by the present invention; The water after water treatment facilities are handled and the water at thermal recovery water source carry out interchange of heat in the one-level heat-exchange device; Then; The said water after water treatment facilities are handled that comes out from said one-level heat-exchange device gets into the thermal recovery injection device, simultaneously, further goes into the water treatment facilities to carry out water treatment through the heat exchange of secondary heat-exchange device is laggard from the water at the said thermal recovery water source that said one-level heat-exchange device comes out.
In the heavy crude heat extraction water processing system of the present invention, the one-level heat-exchange device and the secondary heat-exchange device that are adopted all can be plate exchanger, also can adopt the heat exchanger that can carry out any kind of interchange of heat known in the art.
In the heavy crude heat extraction water processing system of the present invention; Said secondary heat-exchange device is provided with cooling water (like seawater) inlet, so that can the secondary heat-exchange device, carry out further interchange of heat with cooling water from the water at the said thermal recovery water source that the one-level heat-exchange device comes out.
Be to be understood that; In order to satisfy the requirement of water treatment facilities to the inflow temperature at thermal recovery water source; The present invention also can further comprise three grades of heat-exchange devices, level Four heat-exchange device etc., carries out further interchange of heat thereby can make from the water at the said thermal recovery water source that the secondary heat-exchange device comes out.
The present invention is through adopting heat-exchange device; To being optimized connection between thermal recovery water source, heat-exchange device, water treatment facilities, the thermal recovery injection device; Make the water after handling from water treatment facilities get into the thermal recovery injection device, make the water at thermal recovery water source get into water treatment facilities simultaneously via one-level heat-exchange device, secondary heat-exchange device via the one-level heat-exchange device.Water after the water at thermal recovery water source and water treatment facilities are handled in the one-level heat-exchange device like this carries out interchange of heat; Make the temperature of water at thermal recovery water source reduce; Satisfy the water temperature requirements of water treatment facilities, can utilize the heat that discharges in the temperature course of the water that reduces the thermal recovery water source again, heat the heat supply of coming out from water treatment facilities and adopt the water that injection device uses water inlet; Improve the inflow temperature of thermal recovery injection device, thereby solved the contradiction that exists in the heavy crude heat extraction process.
Effect of the present invention is the inflow temperature that at first thermal recovery water source temperature has been dropped to the water treatment facilities requirements, makes water treatment facilities accomplish the water quality desalination and handles, and has effectively utilized the heat that discharges in the thermal recovery water source cooling procedure simultaneously again; Effectively raise the inflow temperature of thermal recovery injection device; Simultaneously corresponding raising the injection rate of thermal recovery injection device, shortened and accomplished the design required time of injection rate, also reduced firing rate simultaneously; Practice thrift the heat injection cost, improved economic benefit.
Oil thermal recovery of the present invention is applicable to polytype land viscous crude field and marine viscous crude field with method for treating water and system, and it is used conveniently, and has effectively utilized system thermal, has improved system effectiveness and economic benefit.
The accompanying drawing summary
Fig. 1 is the sketch map according to the thermal recovery water treatment technology of an embodiment of the invention.
Fig. 2 is the sketch map according to the thermal recovery water treatment system of an embodiment of the invention.
The specific embodiment
Those skilled in the art will combine accompanying drawing that the present invention is made further detailed description below, so that can put into practice the present invention.Should be appreciated that and to adopt other embodiments, and can make suitable change and do not depart from the spirit or scope of the present invention.For fear of for making those skilled in the art can put into practice unnecessary details the present invention, manual possibly omit some known to those skilled in the art information.Therefore, below describe in detail and should not understand, and scope of the present invention is only defined by accompanying claims with restrictive meaning.
Be that example has been explained General Principle of the present invention sincerely below, but should be noted that the present invention never is limited to this sea viscous crude field with marine viscous crude field.
This sea viscous crude field adopts marine heat injection mode to develop, and platform has a bite underground heat well B15 well, and water temperature is up to 80 ℃, and the water-mineralizing degree surpasses 10000mg/L.Yet the salinity of hot fluid injection device water can not surpass 500mg/l, and water quality is had strict demand.Therefore, must use water treatment facilities, GEOTHERMAL WATER is desalinated processing, reduce its salinity and ion concentration, supply water for the hot fluid injection device.
Yet water treatment facilities have restriction to water temperature; The water temperature that gets into water treatment facilities can not be above 35 ℃; Can influence treatment effect otherwise water temperature is too high; Yet therefore the temperature of GEOTHERMAL WATER must be cooled to GEOTHERMAL WATER below 35 ℃ with a heat of cooling switch before water treatment facilities up to 80 ℃, could let GEOTHERMAL WATER get into water treatment facilities like this and desalinate processing.
See also Fig. 1 and Fig. 2, the present invention is at the underground heat water source, and water treatment facilities are provided with two cover board-like heat exchangers (being one-level heat-exchange device and secondary heat-exchange device) between the hot fluid injection device.In the board-like heat exchanger of first cover, the fresh water (water temperature is lower than 35 ℃) from water treatment facilities come out carries out interchange of heat with 80 ℃ GEOTHERMAL WATER.Through after the interchange of heat, the temperature of 80 ℃ GEOTHERMAL WATER is cooled to about 55 ℃-60 ℃, and the temperature of 35 ℃ the fresh water that comes out from water treatment facilities is lifted to about 50 ℃-55 ℃, gets into then in the hot fluid injection device.Be cooled to about 55 ℃-60 ℃ GEOTHERMAL WATER subsequently and get in the board-like heat exchanger of second cover, carry out interchange of heat with seawater.Through after the interchange of heat, the GEOTHERMAL WATER that is cooled to about 55 ℃-60 ℃ further is cooled to get into then in the water treatment facilities below 35 ℃ by seawater, enters marine after the seawater that is used for cooling off is heated.
Through a such cover water treatment system and technological process, not only GEOTHERMAL WATER has been carried out desalination and handled, supply water for the hot fluid injection device; The temperature that will get into the water of hot fluid injection device simultaneously is increased to about 55 ℃ from 35 ℃, makes water temperature raise 15 ℃～20 ℃, thereby through improving the water inlet water temperature; Improved system's heat energy utilization rate; Make the equipment injection rate increase 0.2-0.5t/h, individual well time heat injection construction period shortens 2-4 days, fuel saving 10-20t; Practice thrift the heat injection cost, improved economic benefit.
In sum; More than being merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention, therefore; All any modifications of within spirit of the present invention and principle, being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a heavy crude heat extraction is used method for treating water, comprises the steps:
Step 1: one-level heat-exchange device and secondary heat-exchange device are set between thermal recovery water source and water treatment facilities;
Step 2: the water at said thermal recovery water source and the water after said water treatment facilities are handled are got in the said one-level heat-exchange device, carry out interchange of heat;
Step 3: make from the water at the said thermal recovery water source that said one-level heat-exchange device comes out to get into the said secondary heat-exchange device; Further carry out interchange of heat; Make then from the water at the said thermal recovery water source that said secondary heat-exchange device comes out to get into the said water treatment facilities, carry out water treatment; And, the water after said water treatment facilities are handled that comes out from said one-level heat-exchange device is got into the thermal recovery injection device.
2. the method for claim 1, it further comprises the steps:
Repeating step 2 and step 3 are constantly to supply water in said water treatment facilities and said thermal recovery injection device.
3. the method for claim 1, wherein said thermal recovery water source is GEOTHERMAL WATER water source, oil field, its temperature is more than or equal to 80 ℃.
4. the method for claim 1; Wherein in the step 3; The water at said thermal recovery water source carries out further interchange of heat with cooling water in said secondary heat-exchange device, the temperature from the water at the said thermal recovery water source that said secondary heat-exchange device comes out further is reduced to less than 40 ℃ then.
5. method as claimed in claim 4, wherein said cooling water are seawater.
6. the method for claim 1, wherein in the step 3, the temperature of the water after said water treatment facilities are handled that comes out from said one-level heat-exchange device is more than or equal to 50 ℃.
7. heavy crude heat extraction water processing system; Said system comprises thermal recovery water source, water treatment facilities and thermal recovery injection device; It is characterized in that; Between said thermal recovery water source and said water treatment facilities, also be provided with one-level heat-exchange device and secondary heat-exchange device; Said thermal recovery water source, said one-level heat-exchange device, said secondary heat-exchange device link to each other with said water treatment facilities successively, and an end of said one-level heat-exchange device links to each other with the water out of said water treatment facilities, and the other end links to each other with the water inlet of said thermal recovery injection device.
8. system as claimed in claim 7, wherein said one-level heat-exchange device and said secondary heat-exchange device are plate exchanger.
9. system as claimed in claim 6, wherein said second heat-exchange device is provided with the cooling water inlet.
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| CN201110421019.XA CN102518416B (en) | 2011-12-15 | 2011-12-15 | Thickened oil thermal recovery water treatment method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103011454A (en) * | 2012-12-10 | 2013-04-03 | 中国地质大学（武汉） | Terrestrial heat tail water treating process |
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| US4223729A (en) * | 1979-01-12 | 1980-09-23 | Foster John W | Method for producing a geothermal reservoir in a hot dry rock formation for the recovery of geothermal energy |
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| JPH0492074A (en) * | 1990-08-03 | 1992-03-25 | Agency Of Ind Science & Technol | Extraction heat increasing method for geothermal extraction method by single undermining well |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103011454A (en) * | 2012-12-10 | 2013-04-03 | 中国地质大学（武汉） | Terrestrial heat tail water treating process |
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| CN102518416B (en) | 2015-03-18 |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: China Oilfield Services Limited Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: China Oilfield Services Limited Patentee before: China National Offshore Oil Corporation |