CN115678628B - Device, system and method for recovering carbon dioxide from associated gas-liquid by carbon dioxide flooding - Google Patents
Device, system and method for recovering carbon dioxide from associated gas-liquid by carbon dioxide flooding Download PDFInfo
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- CN115678628B CN115678628B CN202211258050.0A CN202211258050A CN115678628B CN 115678628 B CN115678628 B CN 115678628B CN 202211258050 A CN202211258050 A CN 202211258050A CN 115678628 B CN115678628 B CN 115678628B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 331
- 239000007788 liquid Substances 0.000 title claims abstract description 168
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 165
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000007787 solid Substances 0.000 claims abstract description 61
- 230000007246 mechanism Effects 0.000 claims abstract description 59
- 238000011084 recovery Methods 0.000 claims abstract description 40
- 238000000926 separation method Methods 0.000 claims abstract description 34
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 29
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 29
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 28
- 238000006073 displacement reaction Methods 0.000 claims abstract description 26
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 241000579971 Terebridae Species 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 238000009413 insulation Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000009833 condensation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 208000005156 Dehydration Diseases 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims 7
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 1
- 235000017491 Bambusa tulda Nutrition 0.000 claims 1
- 241001330002 Bambuseae Species 0.000 claims 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 1
- 239000011425 bamboo Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 109
- 239000002253 acid Substances 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 8
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- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a carbon dioxide oil displacement associated gas-liquid carbon dioxide recovery device, a system and a method, wherein a gaseous associated gas mixture is converted into gas, liquid and solid tristate through the associated gas-liquid carbon dioxide recovery device, and the gas, liquid and solid tristate physical separation is carried out, so that liquid and solid CO2 are not needed to be compressed in a large proportion like the prior art, and huge energy consumption is saved; the thermodynamic characteristics of the associated gas are utilized to convert the associated gas mixture into gas, liquid and solid states, and the defects of the traditional acid gas treatment are avoided. And after the gas, liquid and solid three-state are physically separated in the separation mechanism, the sufficiently low CO2 in the hydrocarbon mixed gas is ensured to be suitable for being externally output as a product, and the produced gas and liquid are utilized to a greater extent. In addition, the whole associated gas-liquid carbon dioxide recovery system only needs to use fewer auxiliary devices such as a heat exchanger, a pressurizing pump and the like, so that the cost is greatly saved.
Description
Technical Field
The invention relates to the field of carbon dioxide flooding, in particular to a device, a system and a method for recovering carbon dioxide from associated gas-liquid carbon dioxide in carbon dioxide flooding.
Background
Global warming and natural disaster caused by massive emission of greenhouse gas CO2 have been attracting attention from governments of various countries for many years, and have become a problem to be solved. The CO2 oil displacement technology not only can improve the recovery ratio of crude oil, but also can realize the permanent sequestration of greenhouse gas CO2, and is a measure for controlling the carbon dioxide emission to be more economical. The high-concentration CO2 in the CO2 flooding oilfield gas is recycled, so that the carbon dioxide flooding cost can be reduced, and the atmospheric pollution caused by CO2 emission can be avoided. Therefore, research on a separation and purification technology of CO2 in CO2 flooding field gas has important significance for relieving global warming and controlling greenhouse effect.
Chemical and physical solvent processes and thin film processes are the most widely used conventional CO2 removal processes, and these conventional CO2 removal techniques are those that treat at low pressure to remove gaseous CO2. Gaseous CO2 needs to be compressed in large proportion to a pressure suitable for underground sequestration, which requires high energy consumption and cannot avoid drawbacks in conventional acid gas treatment such as water consumption, use of chemicals and corrosion related problems.
The CO2 recycling device comprises a gas-liquid separator, a produced gas source storage tank, a front heater, an H2S remover, an air cold-heat exchange system, a condensate removal tank, a rear heater, a carbonation and dehydrogenation reactor, a water condensation pipe, a dryer, a pure carbon dioxide storage tank, a CO2 liquefying device and a liquid carbon dioxide storage tank which are sequentially connected through pipelines; the gas-liquid separator is connected with the exhaust port of the carbon dioxide oil displacement production well, and the liquid carbon dioxide storage tank is connected with the gas inlet of the carbon dioxide oil displacement injection well. The method can remove oil, water and other gases in the gas-liquid produced by the carbon dioxide flooding production well to obtain CO2 gas with higher purity and meeting the requirements of the carbon dioxide flooding injection well.
As disclosed in CN110617039a, a method for recycling carbon dioxide of associated gas driven by carbon dioxide in low-yield oil field is to treat the associated gas by a three-phase separator and then introduce the treated gas into a centralized treatment station through a production line; separating associated gas in a centralized treatment station by adopting a hollow fiber membrane separation method to separate CO2; the separated CO2 is pressurized and then distributed to a CO2 injection station through an external pipeline, and then is conveyed to an oil well wellhead from the CO2 injection station for reinjection.
However, the above patents all belong to the conventional solvent method and the film method, and the obtained CO2 gas needs to be pressurized and then injected into the ground, and the use of chemical agents cannot be avoided.
Therefore, providing a device, a system and a method for recovering carbon dioxide from a gas-liquid carbon dioxide oil displacement associated with carbon dioxide, which can enable removed CO2 to be injected underground only by simple treatment and avoid using chemical agents, is a technical problem to be solved in the art.
Disclosure of Invention
The invention adopts the following technical scheme:
in a first aspect, the invention adopts a carbon dioxide oil displacement associated gas-liquid carbon dioxide recovery device, which comprises a state conversion mechanism and a separation mechanism;
the state conversion mechanism is communicated with the separation mechanism and is arranged at one side of the separation mechanism;
The separating mechanism comprises a cylinder body and an inclined auger which are communicated up and down, the state switching mechanism comprises a heat insulation pipeline, and a switching element is arranged in the heat insulation pipeline;
The cylinder body comprises a cylinder part and a cone cylinder part which are connected up and down, the heat insulation pipeline is communicated with the cylinder part, the heat insulation pipeline is tangent to the cylinder part, and the gas outlet is arranged at the upper end of the cylinder part and is connected with the cylinder part through the negative pressure device;
The inclined auger comprises an auger shell, and one end of the auger shell below the cone barrel is lower than one end far away from the cone barrel; the inside of the auger shell is rotatably provided with an auger shaft, the outer side of the auger shaft is fixedly provided with a spiral blade, and the solid outlet is arranged at the upper end of the auger shell;
A cylindrical screen is fixedly arranged in the auger shell, and the size of the cylindrical screen is matched with the size of the spiral blade; the liquid outlet is arranged at the lower end of the auger shell.
In a second aspect, the invention adopts a carbon dioxide oil displacement associated gas-liquid carbon dioxide recovery system, which comprises a gas-liquid separator, a first heat exchanger, a cooler and the carbon dioxide oil displacement associated gas-liquid carbon dioxide recovery device which are sequentially connected through pipelines;
The solid outlet of the carbon dioxide oil displacement associated gas-liquid carbon dioxide recovery device is sequentially connected with the heater, the second booster pump, the third heat exchanger and the underground through pipelines.
In a third aspect, the invention provides a carbon dioxide flooding associated gas-liquid carbon dioxide recovery system, which comprises the following steps:
s1, inputting carbon dioxide oil displacement associated gas and liquid into a gas-liquid separator for dehydration treatment to reach the water content standard of 0.00005;
S2, introducing dehydrated associated gas into a first heat exchanger, wherein the pressure of the associated gas is 45-50 bar, and the temperature is-15-20 ℃;
S3, introducing the associated gas discharged from the first heat exchanger into a cooler, and reducing the temperature of the associated gas to-58 to-40 ℃ so as to condense the associated gas into a liquid state;
s4, rapidly introducing the liquid after the condensation of the associated gas discharged from the cooler into a state conversion mechanism of a carbon dioxide oil displacement associated gas-liquid carbon dioxide recovery device, and performing cooling and depressurization treatment to form hydrocarbon mixed gas, liquid CO2 and solid CO2;
S5, a state conversion mechanism of a carbon dioxide flooding associated gas-liquid carbon dioxide recovery device is used for feeding the hydrocarbon mixed gas, liquid CO2 and solid CO2 into a separation mechanism to separate the hydrocarbon mixed gas, the liquid CO2 and the solid CO 2;
S6, discharging the gaseous hydrocarbon mixture by a separation mechanism, and then compressing the gaseous hydrocarbon mixture to the standard of sales gas;
s7, after being discharged by the separating mechanism, the solid CO2 is melted into a liquid state through a heater, and then is processed into a temperature and a pressure suitable for being injected into the ground through a second booster pump and a third heat exchanger, and is injected into the ground; after being discharged by the separating mechanism, the liquid CO2 is directly processed into temperature and pressure suitable for being injected into the ground through the second booster pump and the third heat exchanger, and then is injected into the ground.
The invention has the following advantages:
According to the device, through the state switching mechanism, the liquid flowing at high speed passes through the orifice plate, the section is suddenly reduced, the resistance is locally generated, the pressure of the liquid is reduced, and the temperature is also reduced. Therefore, the liquid condensed by the associated gas at the point B is decomposed into gas, liquid and solid by the state conversion mechanism. Therefore, the state conversion of liquid after the condensation of associated gas is realized, the subsequent separation of solid and liquid CO2 is facilitated, the gaseous CO2 is not required to be compressed in a large proportion later, the energy consumption is greatly saved, and the defects in the traditional acid gas treatment can be avoided.
In the device, the state conversion mechanism is communicated with the cylinder part, the heat insulation pipeline is tangential to the cylinder part, and gas, liquid and solid enter the cylinder part in a three-state tangential way to cause rotary motion, so that solid and liquid with larger inertial centrifugal force are thrown to the outer wall surface to be separated, and gaseous hydrocarbon mixed gas is discharged through the gaseous outlet. Solid and liquid CO2 entering the inclined auger falls on the spiral blade, moves from the lower end to the upper end, falls into the bottom of the auger shell through the cylindrical screen under the action of dead weight in the movement process, and further throws liquid CO to the bottom of the auger shell under the action of centrifugal force in the rotation process of the spiral blade, so that the double solid-liquid separation effect of the solid and liquid CO2 is realized.
According to the system, the gaseous associated gas mixture is converted into gas, liquid and solid tristate through the associated gas-liquid carbon dioxide recovery device, and the gas, liquid and solid tristate physical separation is carried out, so that the liquid and solid CO2 is not required to be compressed in a large proportion like the gaseous CO2 in the prior art, and huge energy consumption is saved; the thermodynamic characteristics of the associated gas are utilized to convert the associated gas mixture into gas, liquid and solid states, and the defects of the traditional acid gas treatment are avoided. And after the gas, liquid and solid three-state are physically separated in the separation mechanism, the sufficiently low CO2 in the hydrocarbon mixed gas is ensured to be suitable for being externally output as a product, and the produced gas and liquid are utilized to a greater extent. In addition, the whole associated gas-liquid carbon dioxide recovery system only needs to use fewer auxiliary devices such as a heat exchanger, a pressurizing pump and the like, so that the cost is greatly saved.
According to the method, the thermodynamic characteristics of associated gas are utilized, and the associated gas mixture is processed by a first heat exchanger until the pressure is 45-50 bar and the temperature is-15-20 ℃; then, in a cooler, the temperature is cooled to-58 to-40 ℃, all the associated gas at the point B is condensed into liquid, and then the liquid rapidly enters a state conversion mechanism, and the liquid is decomposed into gas, liquid and solid states. After the gas, liquid and solid three-state are physically separated in the separation mechanism, the hydrocarbon mixed gas is ensured to have sufficiently low CO2 suitable for being externally transported as a product, and the liquid and solid CO2 can be pressurized to underground for sealing or used as liquid driving liquid for improving the recovery ratio of crude oil through simple treatment.
Drawings
FIG. 1 is a system diagram;
FIG. 2 is a schematic diagram;
FIG. 3 is a diagram showing the overall structure of the device I;
FIG. 4 is a second overall block diagram of the apparatus;
FIG. 5 is a partial cross-sectional view of a first device;
FIG. 6 is a partial cross-sectional view of a second device;
FIG. 7 is an exploded view of the device;
FIG. 8 is an exploded view of the state transition mechanism;
fig. 9 is a sectional view of the state transition mechanism.
Detailed Description
The following detailed description of embodiments of the invention, provided in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
As shown in fig. 1 and 3, the carbon dioxide oil displacement associated gas-liquid carbon dioxide recovery system comprises a gas-liquid separator 1, a first heat exchanger 2, a cooler 3 and a carbon dioxide oil displacement associated gas-liquid carbon dioxide recovery device 10 which are sequentially connected through pipelines.
The gas-liquid separator 1 is connected with the discharge port of the carbon dioxide oil displacement production well, and the carbon dioxide oil displacement associated gas-liquid is dehydrated and deoiled by the gas-liquid separator 1 to meet the requirement of low water content, thereby ensuring low-temperature operation of the downstream.
Wherein, carbon dioxide flooding associated gas-liquid carbon dioxide recovery device 10 includes state transition mechanism 100 and separating mechanism 200. The state transition mechanism 100 converts the dehydrated gaseous associated gas into liquid and solid CO2 and gaseous hydrocarbon mixtures.
It will be appreciated that the CO2 removal techniques of the prior art, which remove gaseous CO2 at low pressure, require a large proportion of compression to a pressure suitable for underground sequestration, require high energy consumption and cannot avoid the disadvantages of conventional acid gas treatment such as water consumption, the use of chemicals and corrosion related problems.
In this embodiment, the dehydrated produced gas is liquefied at a low temperature, and then cooled and depressurized by the carbon dioxide oil-displacement associated gas-liquid carbon dioxide recovery device 10, so that most of the CO2 forms crystals and is separated. Therefore, gaseous CO2 is not required to be compressed in a large proportion, so that energy consumption is greatly saved, and the defects in the traditional acid gas treatment can be avoided.
As shown in fig. 2, the technical principle of the present embodiment is as follows:
It is understood that the sublimation temperature of pure CO2 is-78.5 degrees celsius, the melting point of methane which is the main component of associated gas-liquid is-182 degrees celsius, the melting point of ethane is-172 degrees celsius, the melting point of propane is-187.6 degrees celsius, and the associated gas mixture composed of light hydrocarbon and CO2 will be separated into gas, liquid and solid under specific pressure and temperature environments. The liquid and solid phases separated are CO2, while the gaseous phase is a mixture of hydrocarbons.
This embodiment takes advantage of the thermodynamic properties of associated gas. The associated gas mixture is processed by the first heat exchanger 2 until the state of the point A is reached; then, in the cooler 3, it is cooled to a temperature near the freezing point of CO2 (point B) at a medium pressure and at an ambient temperature (point a), all the associated gas at point B is condensed into liquid, and then the liquid rapidly enters the state transition mechanism 100, and the liquid is decomposed into gas, liquid, and solid tri-states (point C).
After the gas, liquid and solid three-state are physically separated in the separation mechanism 200, the sufficiently low CO2 in the hydrocarbon mixture is ensured to be suitable for being externally conveyed as a product, and the liquid and solid CO2 can be pressurized to underground for sealing or used as liquid driving liquid for improving the recovery ratio of crude oil through simple treatment.
Specifically, the carbon dioxide oil-displacing associated gas-liquid is dehydrated and deoiled by the gas-liquid separator 1, then the dehydrated produced gas exchanges heat in the first heat exchanger 2, and then enters the cooler 3, and is condensed into liquid in the cooler 3, and then the liquid rapidly enters the carbon dioxide oil-displacing associated gas-liquid carbon dioxide recovery device 10.
In this embodiment, the gas outlet 300 of the carbon dioxide flooding associated gas-liquid carbon dioxide recovery device 10 is sequentially connected to the second heat exchanger 4, the first booster pump 5 and the hydrocarbon mixed gas recovery device 6 through pipes; the solid outlet 400 of the carbon dioxide flooding associated gas-liquid carbon dioxide recovery device 10 is sequentially connected with the heater 7, the second booster pump 8, the third heat exchanger 9 and the underground 11 through pipelines; the liquid outlet 500 of the carbon dioxide flooding associated gas-liquid carbon dioxide recovery device 10 is connected with a pipeline between the heater 7 and the second booster pump 8 through a pipeline.
By the arrangement, the gaseous hydrocarbon mixture separated by the carbon dioxide flooding associated gas-liquid carbon dioxide recovery device 10 is compressed to the standard of sales gas; the solid CO2 is melted into liquid state through the heater 7, and then is processed into temperature and pressure suitable for being injected into the ground through the second booster pump 8 and the third heat exchanger 9; the liquid CO2 is directly treated by the second booster pump 8 and the third heat exchanger 9 to a temperature and pressure suitable for injection into the ground.
Therefore, in the carbon dioxide flooding associated gas-liquid carbon dioxide recovery system of the embodiment, the associated gas-liquid carbon dioxide recovery device 10 is used for converting the gaseous associated gas mixture into gas, liquid and solid tri-states and performing physical separation of the gas, liquid and solid tri-states, so that the liquid and solid CO2 are not required to be compressed in a large proportion like the gaseous CO2 in the prior art, and huge energy consumption is saved; the thermodynamic characteristics of the associated gas are utilized to convert the associated gas mixture into gas, liquid and solid states, and the defects of the traditional acid gas treatment are avoided.
And after the gas, liquid and solid three-state are physically separated in the separation mechanism 200, the sufficiently low CO2 in the hydrocarbon mixed gas is ensured to be suitable for being externally output as a product, and the produced gas and liquid are utilized to a greater extent.
In addition, the whole associated gas-liquid carbon dioxide recovery system only needs to use fewer auxiliary devices such as a heat exchanger, a pressurizing pump and the like, so that the cost is greatly saved.
In this embodiment, as shown in fig. 3 to 9, the state transition mechanism 100 is connected to the separation mechanism 200, and is disposed on one side of the separation mechanism 200.
Specifically, the separating mechanism 200 includes a cylinder 210, an inclined auger 220, and a supporting mechanism 230, where the supporting mechanism 230 is used to fixedly support the cylinder 210 and the inclined auger 220. The state transition mechanism 100 includes an insulated pipe 110, and a transition element 120 is installed inside the insulated pipe 110.
It will be appreciated that the inlet end of the insulated pipe 110 is connected to the cooler 3 via a pipe, the outlet end of the insulated pipe 110 is connected to the separation mechanism 200, and the liquid condensed from the mixed gas is decomposed into gas, liquid and solid states in the insulated pipe 110, and enters the separation mechanism 200 from the outlet end.
The cylinder 210 includes a cylindrical portion 211 and a conical portion 212 connected up and down, the heat insulation pipe 110 is connected to the cylindrical portion 211, the heat insulation pipe 110 is tangent to the cylindrical portion 211, and the gas outlet 300 is disposed at the upper end of the cylindrical portion 211 and is connected to the cylindrical portion 211 through the negative pressure device 240.
Thus, the gas, liquid and solid phases with a certain speed flowing out from the outlet end of the heat insulation pipeline 110 enter the cylinder part 211 tangentially, so that the rotation motion is caused, the solid phase and the liquid phase with larger inertial centrifugal force are separated towards the outer wall surface, and the gaseous hydrocarbon mixture is firstly discharged through the gaseous outlet 300 to enter the subsequent process under the action of the negative pressure device 240; solid and liquid state move down the cone portion 212 into the tilting auger 220.
Preferably, a guide plate 213 is further provided in the cylindrical portion 211, and the guide plate 213 is connected to the negative pressure device 240 so as to better discharge the gas from the cylindrical portion 211.
In this embodiment, the cone portion 212 is connected to the tilting auger 220 via a funnel 250.
In this embodiment, the tilting auger 220 functions as a solid and liquid separation.
Specifically, the tilting auger 220 includes an auger housing 221, and an end (lower end) of the auger housing 221 below the cone section 212 is lower than an end (upper end) away from the cone section 212; the auger shaft 222 is rotatably installed in the auger shell 221, the spiral blade 223 is fixedly installed on the outer side of the auger shaft 222, and the solid-state outlet 400 is arranged at the upper end of the auger shell 221.
Wherein, a cylindrical screen 224 is also fixedly installed in the auger shell 221, and the size of the cylindrical screen 224 is matched with the size of the spiral blade 223; the liquid outlet 500 is provided at the lower end of the packing auger housing 221.
Through the arrangement, the solid and liquid CO2 entering the inclined auger 220 falls on the spiral blade 223, moves from the lower end to the upper end under the action of the spiral blade 223, falls into the bottom of the auger shell 221 through the cylindrical screen 224 and is discharged from the liquid outlet 500 under the action of dead weight in the movement process, and the solid and liquid CO2 can be further thrown to the bottom of the auger shell 221 and is discharged from the liquid outlet 500 under the action of centrifugal force in the rotation process of the spiral blade 223, so that the double solid-liquid separation effect of the solid and liquid CO2 is realized.
In this embodiment, a first opening 225 is formed above the lower end of the cylindrical screen 224, so that the solid and liquid CO2 falls on the spiral blade 223; a second opening 226 is provided below the upper end of the cylindrical screen 224 to facilitate solid CO2 removal.
In this embodiment, the conversion element 120 includes a first orifice plate 121 and a second orifice plate 122, where the first orifice plate 121 and the second orifice plate 122 are fixedly installed on the inner wall of the heat insulation pipe 110, and divide the heat insulation pipe 110 into two spaces (denoted as a liquid inlet space and a liquid outlet space), and the two spaces can only be communicated by the orifices 123 of the first orifice plate 121 and the second orifice plate 122.
It will be appreciated that the apertures 123 formed in the first aperture plate 121 and the second aperture plate 122 are the same size and are aligned.
With the above arrangement, the liquid flowing at a high speed passes through the first orifice plate 121 and the second orifice plate 122, and the pressure and the temperature of the liquid are lowered due to the resistance generated locally by the sudden reduction of the cross section. Thus, the liquid condensed with the gas at the point B is decomposed into gas, liquid, and solid three states (point C) by the state transition mechanism 100.
Therefore, the state conversion of liquid after the condensation of associated gas is realized, the subsequent separation of solid and liquid CO2 is facilitated, the gaseous CO2 is not required to be compressed in a large proportion later, the energy consumption is greatly saved, and the defects in the traditional acid gas treatment can be avoided.
In this embodiment, a sliding plate 124 is slidably disposed between the first orifice plate 121 and the second orifice plate 122, and a chute 125 is disposed on the opposite surface of the first orifice plate 121 and the second orifice plate 122; the sliding plate 124 is provided with an adjusting hole 126, and the size and the position of the adjusting hole 126 are matched with those of the hole 123; an adjusting member 127 is installed at one side of the sliding plate 124.
Through the arrangement, according to the condition of specific associated gas, the control system can control the adjusting piece 127, so that the sliding plate 124 is driven to move, the superposition degree of the adjusting hole 123 and the adjusting hole 126 is adjusted, and finally, the condition that liquid is converted into gas, liquid and solid three-state after different associated gas is condensed is met.
The embodiment also provides a method for recovering carbon dioxide from carbon dioxide flooding associated gas-liquid, which comprises the following steps:
s1, inputting carbon dioxide oil displacement associated gas and liquid into a gas-liquid separator 1 for dehydration treatment to reach the water content standard of 0.00005;
S2, introducing dehydrated associated gas into the first heat exchanger 2, wherein the pressure of the associated gas is 45-50 bar, and the temperature is-15-20 ℃;
S3, introducing the associated gas discharged from the first heat exchanger 2 into a cooler 3, and reducing the temperature of the associated gas to-58 to-40 ℃ so as to condense the associated gas into a liquid state;
s4, rapidly introducing the liquid obtained after the condensation of the associated gas discharged from the cooler 3 into a state conversion mechanism 100 of a carbon dioxide oil displacement associated gas-liquid carbon dioxide recovery device 10, and performing cooling and depressurization treatment to form hydrocarbon mixed gas, liquid CO2 and solid CO2;
S5, a state conversion mechanism 100 of the carbon dioxide flooding associated gas-liquid carbon dioxide recovery device 10 is used for feeding the hydrocarbon mixed gas, liquid CO2 and solid CO2 into a separation mechanism 200 to separate the hydrocarbon mixed gas, the liquid CO2 and the solid CO 2;
s6, discharging the gaseous hydrocarbon mixture by the separation mechanism 200, and compressing the gaseous hydrocarbon mixture to the standard of sales gas;
s7, after being discharged by the separation mechanism 200, the solid CO2 is melted into a liquid state through the heater 7, and then is processed into a temperature and a pressure suitable for being injected into the ground through the second pressurizing pump 8 and the third heat exchanger 9; after the liquid CO2 is discharged from the separation mechanism 200, it is directly processed by the second booster pump 8 and the third heat exchanger 9 to a temperature and a pressure suitable for being injected into the ground.
According to the method provided by the embodiment, the thermodynamic characteristics of associated gas are utilized, and the associated gas mixture is processed by the first heat exchanger 2 until the pressure is 45-50 bar and the temperature is-15-20 ℃; then, in the cooler 3, the temperature is cooled to-58 to-40 ℃, all the associated gas at the point B is condensed into liquid, and then the liquid rapidly enters the state conversion mechanism 100, and the liquid is decomposed into gas, liquid and solid three states.
After the gas, liquid and solid three-state are physically separated in the separation mechanism 200, the sufficiently low CO2 in the hydrocarbon mixture is ensured to be suitable for being externally conveyed as a product, and the liquid and solid CO2 can be pressurized to underground for sealing or used as liquid driving liquid for improving the recovery ratio of crude oil through simple treatment.
The foregoing is illustrative of the best mode of carrying out the invention, and is not presented in any detail as is known to those of ordinary skill in the art. The protection scope of the invention is defined by the claims, and any equivalent transformation based on the technical teaching of the invention is also within the protection scope of the invention.
Claims (9)
1. The device is characterized by comprising a state conversion mechanism and a separation mechanism;
the state conversion mechanism is communicated with the separation mechanism and is arranged at one side of the separation mechanism;
The separating mechanism comprises a cylinder body and an inclined auger which are communicated up and down, the state switching mechanism comprises a heat insulation pipeline, and a switching element is arranged in the heat insulation pipeline;
The cylinder body comprises a cylinder part and a cone cylinder part which are connected up and down, the heat insulation pipeline is communicated with the cylinder part, the heat insulation pipeline is tangent to the cylinder part, and the gas outlet is arranged at the upper end of the cylinder part and is connected with the cylinder part through the negative pressure device;
The inclined auger comprises an auger shell, and one end of the auger shell below the cone barrel is lower than one end far away from the cone barrel; the auger shaft is rotatably arranged in the auger shell, the spiral blades are fixedly arranged on the outer side of the auger shaft, and the solid outlet is arranged at the upper end of the auger shell;
a cylindrical screen is fixedly arranged in the auger shell, and the size of the cylindrical screen is matched with the size of the spiral blade; the liquid outlet is arranged at the lower end of the auger shell;
The conversion element comprises a first pore plate and a second pore plate, the first pore plate and the second pore plate are fixedly arranged on the inner wall of the heat insulation pipeline, the heat insulation pipeline is divided into two spaces, and the two spaces can only be communicated by the pores of the first pore plate and the second pore plate.
2. The apparatus of claim 1, wherein: and a guide disc is further arranged in the cylinder part and connected with a negative pressure device.
3. The apparatus of claim 1, wherein: the cone section of thick bamboo portion is connected with the slope auger through the funnel.
4. The apparatus of claim 1, wherein: a first opening is formed above the lower end of the cylindrical screen;
a second opening is formed below the upper end of the cylinder screen.
5. A carbon dioxide oil displacement associated gas-liquid carbon dioxide recovery system is characterized in that: comprising a gas-liquid separator, a first heat exchanger, a cooler and a carbon dioxide oil displacement associated gas-liquid carbon dioxide recovery device according to any one of claims 1-4 which are connected in sequence through pipelines;
The solid outlet of the carbon dioxide oil displacement associated gas-liquid carbon dioxide recovery device is sequentially connected with the heater, the second booster pump, the third heat exchanger and the underground through pipelines.
6. The system according to claim 5, wherein: the gas-liquid separator is connected with the discharge port of the carbon dioxide oil displacement production well.
7. The system according to claim 5, wherein: the gas outlet of the carbon dioxide oil displacement associated gas-liquid carbon dioxide recovery device is sequentially connected with the second heat exchanger, the first booster pump and the hydrocarbon mixed gas recovery device through pipelines.
8. The system of claim 7, wherein: the liquid outlet of the carbon dioxide oil displacement associated gas-liquid carbon dioxide recovery device is connected with a pipeline between the heater and the second pressurizing pump through a pipeline.
9. A method for recovering carbon dioxide from associated gas-liquid carbon dioxide by using the carbon dioxide-driven associated gas-liquid carbon dioxide recovery system as claimed in any one of claims 5 to 8, comprising the following steps:
s1, inputting carbon dioxide oil displacement associated gas and liquid into a gas-liquid separator for dehydration treatment to reach the water content standard of 0.00005;
S2, introducing dehydrated associated gas into a first heat exchanger, wherein the pressure of the associated gas is 45-50 bar, and the temperature is-15-20 ℃;
S3, introducing the associated gas discharged from the first heat exchanger into a cooler, and reducing the temperature of the associated gas to-58 to-40 ℃ so as to condense the associated gas into a liquid state;
S4, rapidly introducing the liquid after the condensation of the associated gas discharged from the cooler into a state conversion mechanism of a carbon dioxide oil displacement associated gas-liquid carbon dioxide recovery device, and performing cooling and depressurization treatment to form hydrocarbon mixed gas, liquid CO 2 and solid CO 2;
S5, a state conversion mechanism of a carbon dioxide flooding associated gas-liquid carbon dioxide recovery device is used for feeding the hydrocarbon mixed gas, the liquid CO 2 and the solid CO 2 into a separation mechanism to separate the hydrocarbon mixed gas, the liquid CO 2 and the solid CO 2;
S6, discharging the gaseous hydrocarbon mixture by a separation mechanism, and then compressing the gaseous hydrocarbon mixture to the standard of sales gas;
S7, after being discharged by the separating mechanism, the solid CO 2 is melted into liquid state through a heater, and then is processed into temperature and pressure suitable for being injected into the ground through a second booster pump and a third heat exchanger, and is injected into the ground; after being discharged by the separating mechanism, the liquid CO 2 is directly processed into the temperature and the pressure suitable for being injected into the ground through the second pressurizing pump and the third heat exchanger, and then is injected into the ground.
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