CN116066044A - High-temperature high-pressure electric steam generating and injecting system for oil field oil production well - Google Patents
High-temperature high-pressure electric steam generating and injecting system for oil field oil production well Download PDFInfo
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- CN116066044A CN116066044A CN202310164807.8A CN202310164807A CN116066044A CN 116066044 A CN116066044 A CN 116066044A CN 202310164807 A CN202310164807 A CN 202310164807A CN 116066044 A CN116066044 A CN 116066044A
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- 238000004519 manufacturing process Methods 0.000 title claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 106
- 239000003129 oil well Substances 0.000 claims abstract description 22
- 238000011033 desalting Methods 0.000 claims description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000010793 Steam injection (oil industry) Methods 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 8
- 238000005485 electric heating Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000008234 soft water Substances 0.000 description 7
- 229920006395 saturated elastomer Polymers 0.000 description 6
- 239000008399 tap water Substances 0.000 description 6
- 235000020679 tap water Nutrition 0.000 description 6
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2401—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection by means of electricity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The application discloses a high-temperature high-pressure steam generation steam injection system for an oilfield oil well, which comprises a boiler, a heat exchanger and a superheater, wherein the boiler is connected with the heat exchanger; steam in the boiler enters the heat exchanger through the superheater after leaving the boiler, and then returns to the boiler through the heat exchanger; the heat exchanger is connected with a water supply pump, and the water supply pump is used for conveying water into the heat exchanger, and the water pressure between the water supply pump and the heat exchanger is not lower than 15Mpa.
Description
Technical Field
The invention relates to the field of oilfield production equipment, in particular to a high-temperature high-pressure electric steam generating and injecting system for an oilfield oil well.
Background
In some oil wells, high-temperature and high-pressure steam needs to be injected into the oil well during exploitation (i.e. thickened oil thermal exploitation), a steam generation and gas injection system for injecting gas into the oil well is disclosed in patent publication CN113237047a, and the steam generated by an electrode boiler (or a gas injection furnace) in the system is directly injected into the oil well after being subjected to heat treatment by a superheater.
The system has two problems in the practical use process, namely, the electrode boiler and the superheated steam heater are of shell type structures, the steam pressure for steam injection for an oil well is basically above 15MPA, and the steam pressure is high (the steam temperature is above 300 ℃), the boiler shell, the steam drum steam injection furnace, the superheater and other equipment and corresponding pipelines are designed into high-pressure high-temperature structures, the wall thickness of the boiler shell is thick, the selected materials are complex and difficult to manufacture, the cost of products can be greatly increased, and the reliability of the whole system can be reduced due to the fact that the high pressure of 15MPA is required for many equipment; the second problem is that once the well is blown out (or the boiler suddenly stops supplying steam), the liquid in the well can flow back into the superheater and then into the steam injection furnace or the electrode boiler, thus the electrode can be broken down, the high-voltage power grid is tripped, even the casualty accident occurs, and the whole system can be polluted by the liquid sprayed out of the well, thus the system belongs to serious safety production accidents.
Disclosure of Invention
The invention provides a high-temperature high-pressure electric steam generating steam injection system for an oil field oil production well aiming at the problems.
The technical scheme adopted by the invention is as follows:
the high-temperature high-pressure electric steam generating and injecting system for the oilfield oil well comprises a boiler, a heat exchanger and a superheater, wherein the boiler is connected with the heat exchanger, the superheater is arranged between the boiler and the heat exchanger, and a closed circulation loop is formed among the boiler, the heat exchanger and the superheater; steam in the boiler enters the heat exchanger through the superheater after leaving the boiler, and then returns to the boiler through the heat exchanger; the heat exchanger is connected with a water supply pump, and the water supply pump is used for conveying water into the heat exchanger, and the water pressure between the water supply pump and the heat exchanger is not lower than 15Mpa.
The pressure of the steam generated by the boiler is 2.5Mpa, the steam temperature of the saturated steam leaving from the boiler is 226 ℃, the temperature and the pressure resistance requirement of the boiler are greatly reduced, the temperature of the steam generated by the boiler is only 226 ℃, the steam temperature in the condition can not heat the water of 15Mpa in the heat exchanger to 342 ℃, so that the superheater is further arranged between the heat exchanger and the boiler, the saturated steam can be further heated by the superheater, the saturated steam is heated into superheated steam, the temperature of the steam is continuously increased in the process of being heated into the superheated steam, but the pressure of the steam is not increased. So the saturated steam (pressure is 2.5Mpa, temperature is 226 ℃) generated by the boiler is heated by the superheater to overheat steam (pressure is 2.5Mpa, temperature is about 500 ℃), the overheat steam exchanges heat with water of 15Mpa after entering the heat exchanger, the overheat steam heats water of 15Mpa in the heat exchanger to oil field steam of which temperature is not lower than 300 ℃ and pressure is not lower than 15Mpa, the oil field steam is input into a tight oil well after leaving the heat exchanger, and the overheat steam heated to the oil field steam is condensed and recycled after entering the boiler again.
In summary, in the system, low-temperature low-pressure saturated steam (pressure is 2.5Mpa and temperature is 226 ℃) generated by the boiler is heated into superheated steam (pressure is 2.5Mpa and temperature is about 500 ℃) through the superheater, water of 15Mpa of the heat exchanger is heated into oil field steam after the superheated steam enters the heat exchanger, the oil field steam is conveyed to the oil field, and the superheated steam is conveyed back to the boiler after being cooled in the heat exchanger and being in a water form. Therefore, on the circulating path of the boiler, the heat exchanger and the heater, except the heat exchanger, all other equipment, pipelines and joints do not need to reach the pressure resistance of 15Mpa, and the pressure resistance of the whole system only needs to reach more than 15Mpa, so that the use amount of high-pressure resistant equipment is greatly reduced, and the reliability of the whole system in use is improved. Even if blowout occurs in the oil well, the scrapped equipment only has the heat exchanger and the water supply pump, so that the damage of all the equipment of the whole system is avoided. Meanwhile, the water used in the boiler is in a continuous circulation state basically, so that the boiler basically does not need to be supplemented with new pure water (or soft water, the water used in the boiler is soft water or pure water), and the water pumped into the heat exchanger by the water supply pump can be ordinary tap water, thereby greatly reducing the use amount of the pure water (or soft water) by using the system.
In summary, only the water supply pump and the heat exchanger in the system need bear the high pressure of more than 15Mpa, so that the use of pressure-bearing equipment is greatly reduced, the leakage probability of the whole system is reduced, and meanwhile, the use amount of soft water or pure water is also greatly reduced.
The specific superheater is an electric heating superheater.
Optionally, the boiler further comprises a condensation water tank, and the condensation water tank is arranged between the heat exchanger and the boiler.
Steam in the boiler enters the heat exchanger to cool and condense, then leaves the heat exchanger, enters the condensing water tank, and finally enters the boiler for recycling in a form of condensed water after being condensed in the condensing water tank.
Optionally, the boiler further comprises a deaerator, and the deaerator is connected with the boiler.
The deaerator is used for removing oxygen in water.
Optionally, the device also comprises a water softening device, and the water softening device is connected with the deaerator.
Optionally, the water softener further comprises a desalting water tank, and the desalting water tank is arranged between the water softener and the deaerator.
Because the water in the boiler constantly circulates and reciprocates among the boiler, the superheater, the heat exchanger and the boiler, the phenomenon of drip leakage (and part of leakage in the circulation process) can be inevitably caused on the pipeline, so the desalting water tank and the water softener are arranged, and certain pure water can be conveniently supplemented into the boiler when needed.
Optionally, the boiler further comprises a blowdown flash tank, and the blowdown flash tank is connected with the boiler.
Optionally, a circulating pump assembly is arranged on the boiler.
The beneficial effects of the invention are as follows: only the water supply pump and the heat exchanger need to bear high pressure of more than 15Mpa, so that the use of pressure-bearing equipment is greatly reduced, the leakage probability of the whole system is reduced, and meanwhile, the use amount of soft water or pure water is also greatly reduced.
Description of the drawings:
FIG. 1 is a schematic diagram of a high-temperature high-pressure steam generating and injecting system for an oilfield oil well;
FIG. 2 is an enlarged schematic diagram of FIG. 1 at A;
fig. 3 is an enlarged schematic diagram at B in fig. 1.
The reference numerals in the drawings are as follows: 1. a cylinder; 2. a deaerator; 3. a boiler feed water pump; 4. a sewage discharge expansion vessel; 5. an electrode boiler; 6. a medicine replenishment tank; 7. a circulation pump assembly; 8. a superheater; 9. a heat exchanger; 10. a water supply pump; 11. municipal water supply lines, 12, condensate tanks; 13. an iron removing device; 14. a pure water device; 15. a desalting water tank.
The specific embodiment is as follows:
the present invention will be described in detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1 to 3, the high-temperature high-pressure electric steam generating steam injection system for the oilfield oil well is described with reference to fig. 1 and comprises an electrode boiler 5, a sub-cylinder 1, an electric heating superheater 8, a heat exchanger 9, a condensate tank and a thermal deaerator 2, wherein the electrode boiler 5 is connected with the sub-cylinder 1 through a pipeline, the sub-cylinder 1 is connected with the electric heating superheater 8 through a pipeline, the electric heating superheater 8 is connected with the heat exchanger 9 through a pipeline, the heat exchanger 9 is connected with the condensate tank through a pipeline, the condensate tank is connected with the thermal deaerator 2 through a pipeline, and the thermal deaerator 2 is connected with the electrode boiler 5 through a pipeline.
Referring to the double arrow in fig. 1, saturated steam (pressure is 2.5Mpa and temperature is 226 ℃) generated by an electrode boiler 5 enters an electric heating superheater 8 through a gas separation cylinder 1, the steam further increases the temperature of the steam (the temperature is increased to about 500 ℃ and the steam pressure is unchanged) in the electric heating superheater 8 and then enters a heat exchanger 9, the steam enters a condensation water tank after heat exchange and temperature reduction in the heat exchanger 9 (in the form of steam or condensed water), condensed water in the condensation water tank enters a thermal deaerator 2 through a pipeline, and the condensed water is recycled in the electrode boiler 5 after oxygen is removed through the thermal deaerator 2. In the process, a complete closed circulation loop is formed, tap water supplied by a municipal pipe network enters the heat exchanger 9 through the water supply pump 10 (a plunger pump is selected), then exchanges heat with steam generated by the electrode boiler 5, the water pressure between the water supply pump 10 and the heat exchanger 9 is not lower than 15Mpa, and the water in the heat exchanger 9 is heated to steam (the pressure is not lower than 15Mpa and the temperature is not lower than 300 ℃) and then is input into an oil well. The water used by the electrode boiler 5 in the above process is soft water or pure water, and the path taken by the steam generated by the electrode boiler 5 is a circulation loop, so that the steam generated by the electrode boiler 5 basically returns to the electrode boiler 5 in the form of condensed water, and the steam injected into the oil well is directly vaporized by the running water of the municipal pipe network entering the heat exchanger 9, so that the pure water or soft water is basically not consumed (the loss is very small). The steam generated by the electrode boiler 5 in the present system acts as a heat transfer medium by means of the heat exchanger 9, and the steam used by the oil well is all from the heated vaporization of tap water (low quality water).
In this embodiment, the sub-cylinder 1 is further connected to the thermal deaerator 2 through a pipe, because a part of steam generated by the electrode boiler 5 is separated out in the form of condensed water through the pipe, and the condensed water is directly input into the thermal deaerator 2 for deaeration after being treated by the sub-cylinder 1, and then is input back into the electrode boiler 5 after deaeration is completed. The gas separation cylinder 1 can also play a certain temporary storage role on the steam generated by the electrode boiler 5, so that when the electrode boiler 5 fails, the steam temporarily stored in the gas separation cylinder 1 can maintain the whole system to operate for a period of time, and the sudden loss of steam supply of an oil well is avoided.
In this embodiment, the water in the electrode boiler 5 will have a certain loss during the process of continuously reciprocating the steam generated by the electrode boiler 5, in order to timely supplement the water in the electrode boiler 5, a pure water device 14 and a demineralized water tank 15 are further added, the demineralized water tank 15 is connected with the thermal deaerator 2 through a pipeline, the pure water device 14 is connected with the demineralized water tank 15 through a pipeline, the tap water in the municipal pipe network is purified by the pure water device 14, and then is input into the thermal deaerator 2 in the form of pure water after being desalted by the demineralized water tank 15, and then enters the electrode boiler 5, so that pure water can be supplemented into the electrode boiler 5 at regular intervals.
When the steam injection system provided by the embodiment is used in a desert area with a photovoltaic power station, the power source of the steam injection system can be completely dependent on the photovoltaic power station, a municipal power grid is not required to erect a power supply line for supplying power, and the power source is sufficiently supplied.
In this embodiment, the electrode boiler 5 is used as the boiler, and in other equivalent embodiments, an electrothermal tube type electric boiler may be used instead of the electrode boiler 5.
Of course, when the system is used in a place where gas is conveniently supplied, a gas boiler may be used instead of the electrode boiler 5.
In this system, in order to remove the rust that may be produced in the whole waterway circulation system, a rust removing device is further provided between the heat exchanger 9 and the condensate tank, and when steam (or condensate water) enters the condensate tank via the heat exchanger 9, the rust removing device is first used to remove the rust. Meanwhile, in order to enable water in the deaerator 2 to smoothly enter the electrode boiler 5, a boiler water feed pump 3 is further arranged between the electrode boiler 5 and the deaerator 2, and the boiler water feed pump 3 is utilized to pump water in the deaerator 2 into the electrode boiler 5.
In this system, low-pressure tap water in a municipal water supply pipeline (connected with a water supply pump 10) is pressurized by the water supply pump 10 and then is conveyed into the heat exchanger 9.
In this system, even when the steam supply to the electrode boiler is suddenly interrupted by a fault (or the well is blown out), the liquid blown out of the well only damages the heat exchanger 9 and the water supply pump 10.
It should be noted that, in fig. 1, the water supply pump 10 shown in fig. 1 and the water of the water softener are from the same municipal water supply pipe, and are actually supplied from two separate municipal water supply pipes.
In the system, the electrode boiler 5 is also connected with a reagent supplementing box 6, so that electrolyte can be conveniently supplemented into the electrode boiler 5 when needed.
In the system, the electrode boiler 5 is connected with a circulating pump assembly 7 assembly, and the circulating pump assembly 7 is used for water circulation operation of the electrode boiler 5 during operation, namely, water above the electrode boiler 5 is pumped out and then is fed into the lower part of the electrode boiler 5.
In the system, the pollution discharge expansion vessel 4 connected with the electrode boiler 5 is used for conveniently discharging pollution.
In the system, low-quality water such as tap water can be directly used for preparing steam for an oil well, so that the requirement on water quality is greatly reduced.
Example 2
A preparation method of steam for oil well adopts the system shown in the embodiment 1, the steam pressure is not lower than 15Mpa, the temperature is not lower than 300 ℃, and in the method, in consideration of energy conservation, an electric heating heater only heats the temperature of superheated steam to about 460 ℃.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but is intended to cover all equivalent modifications, direct or indirect, as would be included in the scope of the invention.
Claims (10)
1. The high-temperature high-pressure steam generating and injecting system for the oilfield oil well is characterized by comprising a boiler, a heat exchanger and a superheater, wherein the boiler is connected with the heat exchanger, the superheater is arranged between the boiler and the heat exchanger, and a closed circulation loop is formed among the boiler, the heat exchanger and the superheater; steam in the boiler enters the heat exchanger through the superheater after leaving the boiler, and then returns to the boiler through the heat exchanger; the heat exchanger is connected with a water supply pump, and the water supply pump is used for conveying water into the heat exchanger, and the water pressure between the water supply pump and the heat exchanger is not lower than 15Mpa.
2. The high temperature, high pressure steam generating and injecting system for an oilfield produced well of claim 1, further comprising a condensate tank disposed between the heat exchanger and the boiler.
3. The high temperature, high pressure, electrical steam generating and injecting system for an oilfield produced well of claim 1, further comprising a deaerator, wherein the deaerator is coupled to the boiler.
4. The high temperature, high pressure, electrical steam generating and injecting system for oil field oil well as claimed in claim 3, further comprising a water softening device, said water softening device being connected to said deaerator.
5. The high temperature, high pressure steam generating and injecting system for oil field oil well as claimed in claim 4, further comprising a desalting water tank, wherein said desalting water tank is arranged between the water softening device and the deaerator.
6. The high temperature, high pressure steam generating and injection system for an oilfield produced well of claim 5, further comprising a boiler feedwater pump disposed between the deaerator and the boiler.
7. The high temperature, high pressure steam generating and injecting system for an oilfield produced well of claim 1, further comprising a blowdown flash tank coupled to the boiler.
8. The high temperature, high pressure, electrical steam generating and injecting system for oil field production well as claimed in claim 1, wherein said boiler is provided with a circulation pump assembly.
9. The high temperature, high pressure, electrical steam generating and injecting system for oil field production well as claimed in claim 2, further comprising a rust removing device, said rust removing device being disposed between the heat exchanger and the condensate tank.
10. The high temperature and high pressure steam generating and injecting system for oil field oil well as claimed in claim 2, wherein said water supply pump is connected with municipal water supply pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310164807.8A CN116066044A (en) | 2023-02-13 | 2023-02-13 | High-temperature high-pressure electric steam generating and injecting system for oil field oil production well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310164807.8A CN116066044A (en) | 2023-02-13 | 2023-02-13 | High-temperature high-pressure electric steam generating and injecting system for oil field oil production well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116066044A true CN116066044A (en) | 2023-05-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310164807.8A Pending CN116066044A (en) | 2023-02-13 | 2023-02-13 | High-temperature high-pressure electric steam generating and injecting system for oil field oil production well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116066044A (en) |
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2023
- 2023-02-13 CN CN202310164807.8A patent/CN116066044A/en active Pending
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