CN108488621B - Circulation cooling device for carbon dioxide fracturing and application method thereof - Google Patents

Circulation cooling device for carbon dioxide fracturing and application method thereof Download PDF

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Publication number
CN108488621B
CN108488621B CN201810281521.7A CN201810281521A CN108488621B CN 108488621 B CN108488621 B CN 108488621B CN 201810281521 A CN201810281521 A CN 201810281521A CN 108488621 B CN108488621 B CN 108488621B
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China
Prior art keywords
liquid
valve
pipeline
tank body
carbon dioxide
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CN201810281521.7A
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CN108488621A (en
Inventor
杨延增
章东哲
宋振云
叶文勇
聂俊
苏伟东
魏小房
谭欢
杜松涛
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China National Petroleum Corp
CNPC Chuanqing Drilling Engineering Co Ltd
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China National Petroleum Corp
CNPC Chuanqing Drilling Engineering Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/08—Cooling; Heating; Preventing freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/002—Details of vessels or of the filling or discharging of vessels for vessels under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/021—Special adaptations of indicating, measuring, or monitoring equipment having the height as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—Orientation
    • F17C2201/035—Orientation with substantially horizontal main axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0332—Safety valves or pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/013—Carbone dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/03—Control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0408—Level of content in the vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/043—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0439—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/046—Enhancing energy recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/01—Purifying the fluid
    • F17C2265/015—Purifying the fluid by separating
    • F17C2265/017—Purifying the fluid by separating different phases of a same fluid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

The invention discloses a circulating cooling device for carbon dioxide fracturing and an application method thereof, wherein the circulating cooling device comprises a tank body, liquid level meters are arranged at the left end and the right end of the tank body, a pressure sensor and a gas phase pipeline are arranged at the top of the tank body, a partition plate is arranged below the tank body, an openable pedestrian passageway is arranged on the partition plate, and a filter screen is arranged at the upper part of the partition plate; two sides of the partition board at the bottom of the tank body are provided with residual liquid discharge ports, and the two residual liquid discharge ports are combined into a residual liquid discharge pipeline; the front and back positions of the left bottom of the tank body are symmetrically provided with liquid inlets, the front and back positions of the right bottom of the tank body are symmetrically provided with liquid outlets, a 'mouth' -shaped liquid phase pipeline is arranged right below the tank body, and the liquid inlets and the liquid outlets are communicated with the 'mouth' -shaped liquid phase pipeline. According to the invention, by improving the process flow, a circulation loop is established between the circulation cooling device and the fracturing truck, so that the concentrated emission of gaseous carbon dioxide and the zero emission of liquid carbon dioxide in the cold pump process are realized.

Description

Circulation cooling device for carbon dioxide fracturing and application method thereof
Technical Field
The invention belongs to the technical field of oil and gas field development, and particularly relates to a circulating cooling device for carbon dioxide fracturing and an application method thereof.
Background
Carbon dioxide fracturing is an emerging fracturing technology, and the main modes include carbon dioxide energized fracturing, carbon dioxide dry sand fracturing and the like. Carbon dioxide energized fracturing is usually combined with hydraulic fracturing, liquid carbon dioxide is pumped into a target layer through a fracturing truck as a pre-fluid, then the well is closed, hydraulic sand fracturing is carried out, carbon dioxide in the target layer is utilized to quickly flow back the fracturing fluid in the flow back process of the fracturing fluid after construction, and the damage of the water-based fracturing fluid to sensitive stratum can be reduced. The carbon dioxide dry sand fracturing has better applicability to low-permeability and low-pressure oil and gas reservoirs, and compared with the water-based fracturing technology, the water-sensitive and water-locking damage of a reservoir can be eliminated, and the fracturing transformation effect is improved; the method is used for shale gas and coal bed gas fracturing, and can promote the analysis of adsorbed natural gas.
Both the two carbon dioxide fracturing modes are pumped by a fracturing truck, and the required displacement is generally 2m 3 Above/min, the fracturing truck pump head must be completely cooled, if the pump head is not sufficiently cooled, liquid carbon dioxide is easily gasified in the pumping process, so that insufficient discharge is caused, and even the fracturing truck runs empty of the pump, so that construction is stopped.
Therefore, the cooling of the pump head of the fracturing truck is an important link of site construction, the existing cold pump mode directly discharges the liquid carbon dioxide passing through the cylinder body of the pump head, the cold pump time is long, the liquid carbon dioxide is extremely wasted, and the noise is very high when a plurality of fracturing trucks are simultaneously discharged.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a circulating cooling device for carbon dioxide fracturing and an application method thereof, wherein a circulating loop is established by using the circulating cooling device and a fracturing truck so as to change the existing cold pump mode in carbon dioxide fracturing construction, and the discharged gas-liquid mixed carbon dioxide is subjected to gas-liquid separation in the process of the fracturing truck cold pump in the process of prepositioning carbon dioxide or dry fracturing construction so as to achieve the recycling of liquid carbon dioxide, realize zero emission of the liquid carbon dioxide and the concentrated emission of the gaseous carbon dioxide, improve the site construction safety, improve the utilization rate of the liquid carbon dioxide and greatly reduce the construction noise.
The technical scheme adopted by the invention is as follows:
the circulating cooling device for the carbon dioxide fracturing is of a horizontal structure and comprises a tank body, liquid level meters are arranged at the left end and the right end of the tank body, a pressure sensor, a safety valve and a gas phase pipeline are arranged at the top of the tank body, a partition plate is arranged below the tank body, an openable pedestrian passageway is arranged on the partition plate, and a filter screen is arranged at the upper part of the partition plate; two sides of the partition board at the bottom of the tank body are provided with residual liquid discharge ports, and the two residual liquid discharge ports are combined into a residual liquid discharge pipeline;
the liquid inlet and the liquid outlet are communicated with the liquid-phase pipeline in the shape of a Chinese character 'kou', a liquid inlet is arranged on the left side of the liquid-phase pipeline in the shape of a Chinese character 'kou', and a liquid outlet is arranged on the right side of the liquid-phase pipeline in the shape of a Chinese character 'kou'.
The bottom of the tank body is also provided with a sand setting observation port and a temperature sensor.
The left end enclosure of the tank body is provided with a manhole.
A liquid outlet communication valve I is arranged on a communicating pipe of the liquid inlet and the liquid phase pipeline in the shape of the Chinese character 'kou'; and a liquid outlet communication valve II is arranged on the communicating pipe of the liquid outlet and the liquid phase pipeline in the shape of the Chinese character 'kou'.
And a flowmeter and a pipeline communication valve are arranged on the liquid phase pipeline in the shape of the Chinese character 'kou' between the liquid inlet and the liquid outlet.
The gas phase pipeline is provided with a gas phase discharge communication valve, the gas phase pipeline is divided into two paths after passing through the gas phase discharge communication valve, one path is connected with a nitrogen pressurization interface through a nitrogen pressurization interface valve, and the other path is connected with a gas phase discharge port through the gas phase discharge valve.
The liquid phase discharge communication valve, the liquid phase discharge valve and the liquid phase discharge port are sequentially arranged on the residual liquid discharge pipeline.
The circulating cooling device further comprises a control cabinet, wherein the pressure sensor, the temperature sensor, the liquid level meter, the flowmeter, the liquid outlet communication valve I, the pipeline communication valve, the liquid outlet communication valve II, the nitrogen pressurization interface valve, the gas phase discharge valve and the liquid phase discharge valve are respectively connected with the control cabinet, and data of the control cabinet are remotely transmitted to the remote control cabinet to be collected, controlled and recorded in a centralized mode.
The circulating cooling device is connected with the fracturing truck through a water supply pipeline, a high-pressure pipeline is arranged on the fracturing truck, the outlet of the high-pressure pipeline is divided into two paths, one path is connected with the circulating cooling device through a high-low pressure communication valve, and the other path is communicated with a wellhead through a wellhead valve.
An application method of a circulating cooling device for carbon dioxide fracturing comprises the following steps:
1) System pressurization
Closing a wellhead valve, opening a high-low pressure communication valve, a liquid outlet communication valve I, a liquid outlet communication valve II, a pipeline communication valve, a liquid inlet and a liquid outlet valve of a 'mouth' -shaped liquid phase pipeline, and stopping pressurizing when the pressure of a tank body rises to be consistent with the pressure of liquid storage equipment by utilizing the gas phase of the liquid storage equipment to pressurize through the liquid inlet when other valves are in a closed state;
2) System priming
Switching gas and liquid phase valves of liquid storage equipment, enabling liquid phase of the liquid storage equipment to be communicated with a liquid inlet of a circulating cooling device, manually opening a gas phase discharge communication valve, remotely opening the gas phase discharge valve to exhaust, filling liquid carbon dioxide in the liquid storage equipment into a tank body of the circulating cooling device through the liquid inlet, reading a liquid level value of a liquid level meter through a remote control box, adjusting the liquid level in the tank body through automatically controlling the opening degree of the gas phase discharge valve to enable the liquid level to be not lower than the height of a partition plate, remotely closing the gas phase discharge valve, and closing a valve of the liquid inlet;
3) Circulation cooling
Starting the fracturing truck to perform circulating cold pump until frosting occurs on a water supply pipeline, a pump head and a high-pressure pipeline of the fracturing truck;
4) Pump filling
Opening a liquid inlet valve, closing a high-low pressure communication valve, opening a wellhead valve, performing normal pumping, opening a nitrogen pressurization interface valve when the pumping is finished, stopping pumping by using a fracturing truck when the liquid level of liquid carbon dioxide in a nitrogen displacement tank body reaches 200mm, and closing the liquid inlet valve;
5) Liquid discharge pressure relief
And (3) maintaining the pressure of the tank body by utilizing nitrogen, manually opening a liquid phase discharge communication valve, remotely opening the liquid phase discharge valve to 30% -40% of opening degree, discharging liquid carbon dioxide to the tank body, closing a nitrogen pressurization interface valve, and after the pressure of the tank body and the pipeline is zero, disassembling the pipeline, and ending the construction.
The beneficial effects of the invention are as follows:
1. the invention can realize the recycling of the liquid carbon dioxide in the cold pump process, improve the utilization rate of the liquid carbon dioxide, reduce the consumption and lower the construction cost.
2. The invention realizes the concentrated emission of gaseous carbon dioxide and the zero emission of liquid carbon dioxide through the circulating cooling device, can improve the site construction safety and greatly reduce the construction noise.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic flow chart of the cold pump of the invention.
Reference numerals illustrate: 1. a liquid inlet; 2. a liquid level gauge; 3. a manhole; 4. a liquid outlet communication valve I; 5. a tank body; 6. a pressure sensor, 7, a diaphragm; 8. a filter screen; 9. a flow meter; 10. a pipeline communication valve; 11. a liquid outlet communication valve II; 12. a gas phase discharge communication valve; 13. a nitrogen pressurization interface valve; 14. a nitrogen pressurization interface; 15. a gas phase discharge valve; 16. a gas phase discharge port; 17. a liquid outlet; 18. a gas phase line; 19. a liquid phase discharge port; 20. a liquid phase discharge valve; 21. a liquid phase discharge communication valve; 22. a temperature sensor; 23. a raffinate withdrawal line; 24. a liquid inlet; 25. a liquid outlet; 26. a sand setting observation port; 27. a remote control box; 28. a control cabinet; 29. a liquid phase pipeline in the shape of a Chinese character 'kou'; 30. a liquid surface; 31. a water supply line; 32. a circulation cooling device; 33. a fracturing truck; 34. a high-low pressure communication valve; 35. a wellhead; 36. a wellhead valve; 37. high pressure pipeline.
Detailed Description
The invention aims to overcome the defects in the prior art and provides a circulating cooling device for carbon dioxide fracturing and a process method.
Example 1:
as shown in fig. 1, the circulating cooling device 32 has a horizontal structure and comprises a tank body 5, liquid level meters 2 are arranged at the left end and the right end of the tank body 5, a pressure sensor 6, a safety valve and a gas phase pipeline 18 are arranged at the top of the tank body 5, a partition 7 is arranged below the inner part of the tank body 5, an openable pedestrian passageway is arranged on the partition 7, and a filter screen 8 is arranged at the upper part of the partition 7; two sides of the partition plate 7 at the bottom of the tank body 5 are provided with residual liquid discharge ports, and the two residual liquid discharge ports are combined into a residual liquid discharge pipeline 23;
the front and back position symmetry of jar body 5 left side bottom is provided with liquid inlet 24, and the front and back position symmetry of jar body 5 right side bottom is provided with liquid outlet 25, is provided with "mouthful" font liquid phase pipeline 29 under jar body 5, liquid inlet 24, liquid outlet 25 all communicate with "mouthful" font liquid phase pipeline 29, be provided with inlet 1 on the left of "mouthful" font liquid phase pipeline, be provided with liquid outlet 17 on the right.
In the process of a cold pump, a circulation passage is established between the invention and the fracturing truck 33, liquid carbon dioxide enters from the water-feeding end of the fracturing truck 33 and is discharged from the high-pressure end, then enters the tank body 5 from the liquid inlet 1, the gas-liquid mixed carbon dioxide is subjected to gas-liquid separation at the left side of the partition plate 7, the gaseous carbon dioxide is gathered at the top of the tank body 5, the liquid carbon dioxide enters the right side of the partition plate 7 through the filter screen 8 and is discharged from the liquid outlet 17 to reenter the water-feeding end of the fracturing truck 33 to form circulation, the effect of cooling the pump head of the fracturing truck is achieved, and in the process, the liquid carbon dioxide is discharged in a zero way.
Example 2:
on the basis of the embodiment 1, a liquid outlet communication valve I4 is arranged on a communication pipeline between the liquid inlet 24 and the liquid phase pipeline 29 in a shape of a Chinese character 'kou'; a liquid outlet communication valve II 11 is arranged on the communicating pipe between the liquid outlet 25 and the liquid phase pipeline 29 in the shape of a Chinese character 'kou'; the flow meter 9 and the pipeline communication valve 10 are arranged on the liquid phase pipeline 29 in the shape of a Chinese character 'kou' between the liquid inlet 24 and the liquid outlet 25.
The gas phase pipeline 18 is provided with a gas phase discharge communication valve 12, the gas phase pipeline 18 is divided into two paths after passing through the gas phase discharge communication valve 12, one path is connected with the nitrogen pressurization interface 14 through the nitrogen pressurization interface valve 13, and the other path is connected with the gas phase discharge port 16 through the gas phase discharge valve 15.
The liquid phase discharge communication valve 21, the liquid phase discharge valve 20 and the liquid phase discharge port 19 are sequentially arranged on the residual liquid discharge line 23.
In the cold pump process, if the pressure of the tank body 5 is too high, the gas phase discharge communication valve 12 can be manually opened, the gas phase discharge valve 15 is remotely opened for discharging and reducing pressure, so that the concentrated discharge of gaseous carbon dioxide is realized, and the noise of construction environment is reduced.
At the end of construction, the liquid phase discharge communication valve 21 can be opened manually, the liquid phase discharge valve 20 can be opened remotely, and the residual liquid discharge can be performed, so that the concentrated discharge of liquid carbon dioxide at the end of construction can be realized.
Example 3:
on the basis of the above embodiment, the circulating cooling apparatus 32 further includes a control cabinet 28, where the pressure sensor 6, the temperature sensor 22, the liquid level meter 2, the flowmeter 9, the liquid outlet communication valve i 4, the pipeline communication valve 10, the liquid outlet communication valve ii 11, the nitrogen pressurization interface valve 13, the gas phase discharge valve 15 and the liquid phase discharge valve 20 are respectively connected with the control cabinet 28, and the data of the control cabinet 28 are remotely transmitted to the remote control cabinet 27 for centralized collection, control and recording.
As shown in fig. 2, the circulating cooling device 32 is connected with the fracturing truck 33 through the water supply pipeline 31, a high-pressure pipeline 37 is arranged on the fracturing truck 33, the outlet of the high-pressure pipeline 37 is divided into two paths, one path is connected with the circulating cooling device 32 through a high-low pressure communication valve 34, and the other path is communicated with a wellhead 35 through a wellhead valve 36.
All pressure, temperature, liquid level and other sensors of the circulating cooling device 32 and data acquisition, display and control of the electric valve are centralized on one control cabinet 28, the control cabinet 28 is installed on the circulating cooling device, the input voltage of the control cabinet 28 is three-phase 380V, the output voltage is 220V and 24V, power is supplied to the electric valve, the pressure, temperature and other sensors and the remote control box 27, and the data of the control cabinet 28 is remotely transmitted to the remote control box 27 for centralized acquisition, control and recording.
Example 4:
the application method of the circulating cooling device for carbon dioxide fracturing comprises the following steps:
1) System pressurization
Closing a wellhead valve 36, opening a high-low pressure communication valve 34, a liquid outlet communication valve I4, a liquid outlet communication valve II 11, a pipeline communication valve 10, a liquid inlet 1 and a liquid outlet 17 of a 'mouth' -shaped liquid phase pipeline 29, and stopping pressurizing when the pressure of a tank body 5 rises to be consistent with the pressure of the liquid storage device by utilizing the gas phase of the liquid storage device to pressurize through the liquid inlet 1 when other valves are in a closed state;
2) System priming
Switching gas and liquid phase valves of liquid storage equipment to enable liquid phase of the liquid storage equipment to be communicated with a liquid inlet 1 of a circulating cooling device 32, manually opening a gas phase discharge communication valve 12, remotely opening a gas phase discharge valve 15 to exhaust, filling liquid carbon dioxide in the liquid storage equipment into a tank body 5 of the circulating cooling device 32 through the liquid inlet 1, reading a liquid level value of a liquid level meter 2 through a remote control box 27, adjusting the height of a liquid level 30 in the tank body 5 through automatically controlling the opening degree of the gas phase discharge valve 15 to enable the height of the liquid level 30 to be not lower than the height of a partition 7, remotely closing the gas phase discharge valve 15, and closing a valve of the liquid inlet 1;
3) Circulation cooling
Starting the fracturing truck 33 to perform circulating cold pump until frosting occurs on the water supply pipeline 31, the pump head and the high-pressure pipeline 37 of the fracturing truck 33;
4) Pump filling
Opening a valve of the liquid inlet 1, closing a high-low pressure communication valve 34, opening a wellhead valve 36, performing normal pumping, opening a nitrogen pressurization interface valve 13 when the pumping is finished, stopping pumping by using the fracturing truck 33 when the liquid carbon dioxide level 30 in the nitrogen displacement tank body 5 reaches 200mm, and closing the valve of the liquid inlet 1;
5) Liquid discharge pressure relief
The nitrogen is utilized to keep the pressure of the tank body 5, the liquid phase discharge communication valve 21 is manually opened, the liquid phase discharge valve 20 is remotely opened to 30% -40% of opening degree, the tank body 5 is discharged, the liquid carbon dioxide is discharged completely, the nitrogen pressurization interface valve 13 is closed, and after the pressure of the tank body 5 and the pipeline is zero, the pipeline is disassembled, and the construction is finished.
Aiming at the problems of large carbon dioxide waste and large noise in the carbon dioxide prepositive and dry sand-adding fracturing construction process, the invention innovatively designs the circulating cooling device by improving the process flow, and establishes a circulating loop with the fracturing truck, so that the fracturing truck realizes concentrated emission of gaseous carbon dioxide and zero emission of liquid carbon dioxide in the cold pump process, achieves the purposes of recycling carbon dioxide and reducing the construction cost, and effectively improves the utilization rate of carbon dioxide.
The foregoing examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention.

Claims (8)

1. The application method of the circulating cooling device for the carbon dioxide fracturing is characterized in that the circulating cooling device for the carbon dioxide fracturing is of a horizontal structure and comprises a tank body (5), liquid level meters (2) are arranged at the left end and the right end of the tank body (5), a pressure sensor (6), a safety valve and a gas phase pipeline (18) are arranged at the top of the tank body (5), a partition plate (7) is arranged below the inner part of the tank body (5), an openable pedestrian passageway is arranged on the partition plate (7), and a filter screen (8) is arranged on the upper part of the partition plate (7); two sides of a partition plate (7) at the bottom of the tank body (5) are provided with residual liquid discharge ports, and the two residual liquid discharge ports are combined into a residual liquid discharge pipeline (23);
the liquid inlet (24) is symmetrically arranged at the front and back positions of the left bottom of the tank body (5), the liquid outlet (25) is symmetrically arranged at the front and back positions of the right bottom of the tank body (5), the 'mouth' -shaped liquid phase pipeline (29) is arranged right below the tank body (5), the liquid inlet (24) and the liquid outlet (25) are both communicated with the 'mouth' -shaped liquid phase pipeline (29), the left side of the 'mouth' -shaped liquid phase pipeline is provided with the liquid inlet (1), and the right side of the 'mouth' -shaped liquid phase pipeline is provided with the liquid outlet (17); a liquid outlet communication valve I (4) is arranged on a communicating pipe between the liquid inlet (24) and the liquid phase pipeline (29) in the shape of a Chinese character 'kou'; a liquid outlet communication valve II (11) is arranged on a communication pipeline between the liquid outlet (25) and the liquid phase pipeline (29) in the shape of a Chinese character 'kou';
the method comprises the following steps:
1) System pressurization
Closing a wellhead valve (36), opening a high-low pressure communication valve (34), a liquid outlet communication valve I (4), a liquid outlet communication valve II (11), a pipeline communication valve (10), a liquid inlet (1) and a liquid outlet (17) of a 'mouth' -shaped liquid phase pipeline (29), and stopping pressurizing when the pressure of a tank body (5) rises to be consistent with the pressure of liquid storage equipment by utilizing the gas phase of the liquid storage equipment to pressurize through the liquid inlet (1) when other valves are in a closed state;
2) System priming
Switching gas and liquid phase valves of liquid storage equipment to enable liquid phase of the liquid storage equipment to be communicated with a liquid inlet (1) of a circulating cooling device (32), manually opening a gas phase discharge communication valve (12), remotely opening a gas phase discharge valve (15) to exhaust, filling liquid carbon dioxide in liquid state of the liquid storage equipment into a tank body (5) of the circulating cooling device (32) through the liquid inlet (1), reading a liquid level value of a liquid level meter (2) through a remote control box (27), adjusting the height of a liquid level (30) in the tank body (5) through automatically controlling the opening degree of the gas phase discharge valve (15), enabling the height of the liquid level (30) to be not lower than the height of a partition plate (7), remotely closing the gas phase discharge valve (15), and closing a valve of the liquid inlet (1);
3) Circulation cooling
Starting the fracturing truck (33) to perform circulating cold pump until frosting occurs on a water feeding pipeline (31), a pump head and a high-pressure pipeline (37) of the fracturing truck (33);
4) Pump filling
Opening a valve of a liquid inlet (1), closing a high-low pressure communication valve (34), opening a wellhead valve (36), performing normal pumping, opening a nitrogen pressurization interface valve (13) when the pumping is finished, and stopping a pump of a fracturing truck (33) and closing the valve of the liquid inlet (1) when the height of a liquid carbon dioxide liquid level (30) in a tank body (5) is driven to 200mm as shown by a liquid level meter by utilizing nitrogen;
5) Liquid discharge pressure relief
The nitrogen is utilized to keep the pressure of the tank body (5), the liquid phase discharge communication valve (21) is manually opened, the liquid phase discharge valve (20) is remotely opened to 30% -40% of opening degree, the tank body (5) is discharged, the liquid carbon dioxide is discharged completely, the nitrogen pressurization interface valve (13) is closed, after the pressure of the tank body (5) and the pipeline is zero, the pipeline is disassembled, and the construction is finished.
2. The application method of the circulating cooling device for carbon dioxide fracturing according to claim 1, wherein the bottom of the tank body (5) is further provided with a sand setting observation port (26) and a temperature sensor (22).
3. The application method of the circulating cooling device for carbon dioxide fracturing according to claim 1, wherein a manhole (3) is arranged on the left end seal of the tank body (5).
4. The application method of the circulating cooling device for carbon dioxide fracturing according to claim 1, wherein a flowmeter (9) and a pipeline communication valve (10) are arranged on a liquid phase pipeline (29) in a shape like a Chinese character 'kou' between the liquid inlet (24) and the liquid outlet (25).
5. The application method of the circulating cooling device for carbon dioxide fracturing is characterized in that a gas phase discharge communication valve (12) is arranged on a gas phase pipeline (18), the gas phase pipeline (18) is divided into two paths after passing through the gas phase discharge communication valve (12), one path is connected with a nitrogen pressurization interface (14) through a nitrogen pressurization interface valve (13), and the other path is connected with a gas phase discharge port (16) through a gas phase discharge valve (15).
6. The method for using the circulating cooling apparatus for carbon dioxide fracturing according to claim 1, wherein the residual liquid discharge pipeline (23) is sequentially provided with a liquid phase discharge communication valve (21), a liquid phase discharge valve (20) and a liquid phase discharge port (19).
7. The application method of the circulating cooling device for carbon dioxide fracturing is characterized in that the circulating cooling device (32) further comprises a control cabinet (28), and the pressure sensor (6), the temperature sensor (22), the liquid level meter (2), the flowmeter (9), the liquid outlet communication valve I (4), the pipeline communication valve (10), the liquid outlet communication valve II (11), the nitrogen pressurization interface valve (13), the gas phase discharge valve (15) and the liquid phase discharge valve (20) are respectively connected with the control cabinet (28), and data of the control cabinet (28) are remotely transmitted to the remote control box (27) for centralized collection, control and recording.
8. The application method of the circulating cooling device for carbon dioxide fracturing is characterized in that the circulating cooling device (32) is connected with a fracturing truck (33) through a water supply pipeline (31), a high-pressure pipeline (37) is arranged on the fracturing truck (33), an outlet of the high-pressure pipeline (37) is divided into two paths, one path is connected with the circulating cooling device (32) through a high-low pressure communication valve (34), and the other path is communicated with a wellhead (35) through a wellhead valve (36).
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