CN112619370A - Carbon dioxide flooding oilfield associated gas recovery device and use method thereof - Google Patents
Carbon dioxide flooding oilfield associated gas recovery device and use method thereof Download PDFInfo
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1425—Regeneration of liquid absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1475—Removing carbon dioxide
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- 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
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Abstract
The invention discloses a carbon dioxide flooding oilfield associated gas recovery device and a using method thereof, wherein the carbon dioxide flooding oilfield associated gas recovery device comprises a separation tank, an absorption liquid storage device, a first compressor, a second compressor and an expander, wherein the separation tank is used for storing absorption liquid for realizing carbon dioxide separation; the absorption liquid storage device is communicated with the separation tank, so that the cyclic utilization of the absorption liquid is realized; the absorption liquid storage device comprises a heating device for heating the absorption liquid; the first compressor is connected with the separation tank and is used for compressing the gas after the carbon dioxide is separated; the second compressor is connected with the absorption liquid storage device and is used for compressing carbon dioxide generated after the absorption liquid storage device is heated; the expander is connected with the second compressor and comprises a throttling valve and a gas collecting cavity, the throttling valve is connected with the second compressor and the gas collecting cavity, and the gas collecting cavity is used for cooling gas compressed by the first compressor. The device has a simple structure, can effectively recycle associated gas by utilizing the device, does not generate waste liquid and waste gas, and is energy-saving and environment-friendly.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to a carbon dioxide flooding oilfield associated gas recovery device and a use method thereof.
Background
The oilfield associated tail gas is gas which is discharged along with petroleum liquid in the oilfield exploitation process and cannot be directly utilized. In the process of exploiting oil by adopting technologies of improving recovery efficiency such as fire flooding, steam flooding or gas flooding (such as carbon dioxide flooding), methane gas accumulated in oil is discharged along with oil displacement gas to become associated gas in the process of exploiting oil fields, the associated gas with high concentration (> 30% vo1) can be directly or indirectly utilized, and the associated gas with low content (generally 1-10% vo 1-containing methane) is mostly directly vented in place due to incapability of being directly combusted and utilized to form associated methane tail gas in the process of exploiting oil fields.
Oilfield associated tail gas is receiving more and more attention due to its special condition. At present, most of the waste water is directly discharged due to the uneconomic recovery technology, so that the resource waste is caused; meanwhile, associated tail gas of production wells such as steam flooding or gas flooding (such as carbon dioxide flooding) mainly contains methane (CH4) and carbon dioxide (CO2), the tail gas is generally recovered or combusted for utilization after sulfur removal on site, the content of the methane (CH4) is unstable, and the tail gas is frequently flamed out in the combustion utilization process to generate potential safety hazards; methane (CH4) is a greenhouse gas, the greenhouse effect is 25 times greater than that of carbon dioxide, causing environmental pollution, and the recovery and utilization of tail gas are an environmental pollution-free ring.
Disclosure of Invention
The invention aims to provide a carbon dioxide driven oilfield associated gas recovery device and a use method thereof, solves the problem of waste liquid and waste gas emission in the existing associated gas recovery process, and provides an oilfield associated gas recovery device which is environment-friendly and economical.
The invention is realized by the following technical scheme:
a carbon dioxide drives oil field associated gas recovery unit, including knockout drum, absorption liquid storage device, first compressor, second compressor, expander, the said knockout drum is used for storing the absorption liquid which realizes the carbon dioxide separation; the absorption liquid storage device is communicated with the separation tank, so that the cyclic utilization of the absorption liquid is realized; the absorption liquid storage device comprises a heating device for heating the absorption liquid; the first compressor is connected with the separation tank and is used for compressing the gas after the carbon dioxide is separated; the second compressor is connected with the absorption liquid storage device and is used for compressing carbon dioxide generated after the absorption liquid storage device is heated; the expansion machine is connected with the second compressor and comprises a throttling valve and a gas collecting cavity, the throttling valve is connected with the second compressor and the gas collecting cavity, and the gas collecting cavity is used for cooling gas compressed by the first compressor.
In the scheme, the associated gas recovery device comprises a separation tank, an absorption liquid storage device, a first compressor, a second compressor and an expander, wherein the separation tank is used for storing absorption liquid for realizing carbon dioxide separation, the oilfield associated gas is introduced into the recovery tank, the associated gas absorbs the carbon dioxide in the associated gas through the absorption effect of the absorption liquid to realize the separation of methane and the carbon dioxide, and the methane enters the first compressor through the separation tank to be compressed; the separation tank is communicated with the absorption liquid storage device, the absorption liquid enters the absorption liquid storage device, the absorption liquid storage device comprises a heating device, the absorption liquid after absorbing the carbon dioxide is heated to produce the carbon dioxide, the generated carbon dioxide enters the second compressor to be compressed, and the absorption liquid after separating out the carbon dioxide only enters the separation tank through a circulation loop, so that the cyclic utilization of the absorption liquid is realized; the exit end setting of second compressor includes the expander of choke valve and gas collection chamber, and the second compressor passes through the choke valve and connects the gas collection chamber, and after carbon dioxide after the compression passed through the choke valve, volume expansion realized based on the cryogenic principle of inflation, and the temperature of carbon dioxide reduces, gets into in the gas collection chamber, cools off as the cold source to the methane after first compressor compression, realizes the recovery of oil field associated gas, and environmental protection economy does not have the production of waste liquid and waste gas.
Preferably, the expanding agent is a heat insulating material for realizing adiabatic expansion of the carbon dioxide.
Preferably, recovery unit still includes two vapour and liquid separators that are used for guaranteeing the gaseous dry gas-liquid separation after the separation, a vapour and liquid separator connects knockout drum and first compressor, another vapour and liquid separator connects knockout drum and second compressor, guarantees through the aridity that sets up the gaseous after the absorption liquid separation of vapour and liquid separator, has guaranteed the life of first compressor and second compressor.
As a further technical scheme of the present invention, the absorption liquid storage device further includes a heat conducting member, the heat conducting member is connected to the first compressor, the second compressor and the heating device, and is configured to transfer heat generated by the first compressor and the second compressor to the heating device.
As a further technical scheme of the invention, the separation tank further comprises a spraying device, the spraying device is connected with the absorption liquid storage device, and the spraying device is arranged for spraying the absorption liquid, so that the separation effect of the associated gas is further ensured, and the sufficient separation of the carbon dioxide and the methane is ensured.
Preferably, spray set is the ring pipe, the inboard and the outside of ring pipe all set up a plurality of shower nozzles, and spray set is the ring pipe, and all sets up the shower nozzle including the outside, realizes spraying of the cross-sectional scope of knockout drum, has further guaranteed the separation effect of associated gas, guarantees the abundant separation of carbon dioxide and methane.
As a further technical scheme of the invention, the absorption liquid is a calcium carbonate mixed liquid, the calcium carbonate absorbs excessive carbon dioxide to produce calcium bicarbonate by adopting the calcium carbonate mixed liquid, the calcium bicarbonate is easy to decompose to produce carbon dioxide and calcium carbonate, and the cyclic utilization of the absorption liquid is realized.
Preferably, the absorption liquid storage device further comprises a stirring device, wherein the stirring device stirs the calcium carbonate mixed liquid in the absorption liquid storage device to ensure that the calcium carbonate is uniformly distributed in the liquid and then enters the separation tank through a pipeline.
Preferably, the absorption liquid storage device further comprises a filter element and an absorption liquid inlet pipe; the absorption liquid enters the absorption liquid storage device through the absorption liquid inlet pipe after absorbing the carbon dioxide; the filter piece is arranged at the absorption liquid inlet pipe and used for filtering calcium carbonate of the separation tank, and the calcium carbonate is filtered by arranging the filter layer, so that only calcium bicarbonate solution is allowed to enter the absorption liquid storage device through the inlet pipe.
As a further technical solution of the present invention, the expander further includes a carbon dioxide exhaust port for introducing the separated carbon dioxide into the oil recovery circuit to realize the cyclic utilization of the carbon dioxide, and by providing the carbon dioxide exhaust port, the discharge of the carbon dioxide is avoided, and the cyclic utilization of the carbon dioxide is realized.
As a further technical scheme, the methane tank further comprises a gas storage tank, the gas storage tank is connected with the first compressor, the gas storage tank is used for collecting gas cooled by the gas collecting cavity, the separated methane is stored by the gas storage tank, and after a certain amount of methane is stored, the methane is canned and transported.
Preferably, the gas holder still includes the check valve that is used for outside gas collecting bottle air feed, through setting up the check valve, has realized the transportation of methane.
As a further technical scheme of the invention, the first compressor is connected with the gas storage tank through a pipeline, and the pipeline is coated by the expanding agent gas collection cavity, so that the temperature of methane in the pipeline is reduced.
Preferably, the pipeline is internally provided with a buffer member, and the buffer member is used for reducing the flow velocity of gas and ensuring sufficient cooling of the gas.
Preferably, the pipeline is arranged in a spiral pipe shape, so that the time of the separated gas in the gas collecting cavity is ensured, and the sufficient cooling of the gas is ensured.
Preferably, a condensing part is further arranged in the expanding agent gas-collecting cavity, so that the condensing efficiency is further ensured, and the condensation of the separated gas is realized.
The invention also discloses a use method of the carbon dioxide flooding oilfield associated gas recovery device, the calcium carbonate mixed solution is used as the absorption liquid, the calcium bicarbonate solution can be produced after the carbon dioxide is fully absorbed, the calcium carbonate mixed solution is used as the absorption liquid, the calcium carbonate mixed solution fully absorbs the carbon dioxide and then produces the calcium bicarbonate solution, the calcium bicarbonate solution is easily decomposed by heating, the calcium carbonate is separated out again and mixed with water to form the calcium carbonate mixed solution, and the recycling of the absorption liquid is realized.
The absorption liquid is calcium carbonate mixed liquid
Calcium carbonate mixed liquor is filled into the separation tank (1) and the absorption liquor storage device (2) to serve as absorption liquor, and the calcium carbonate mixed liquor is utilized to realize the separation of carbon dioxide in associated gas
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the recovery device for the associated gas of the carbon dioxide flooding oil field is simple in structure, and can effectively realize the recovery and utilization of the associated gas;
2. according to the recovery device for the associated gas in the carbon dioxide flooding oilfield, the application of energy generated in the recovery process of the associated gas is realized by arranging the heat conducting fins and the expansion compressor, the energy use efficiency is improved, and the recovery device is energy-saving and environment-friendly;
3. according to the recovery device for associated gas in the carbon dioxide flooding oilfield, the carbon dioxide is recycled by arranging the carbon dioxide exhaust port, so that the carbon dioxide is prevented from being emptied;
4. according to the recovery device for associated gas in the carbon dioxide flooding oilfield, the absorption liquid storage device is arranged to realize cyclic utilization of the absorption liquid, so that waste liquid is prevented from penetrating out, and the recovery device is energy-saving and environment-friendly.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the spraying device of the present invention.
Reference numbers and corresponding part names:
1-separating tank, 11-spraying device, 2-absorption liquid storage device, 21-heating device, 22-heat conducting piece, 23-filtering piece, 24-absorption liquid inlet pipe, 3-first compressor, 4-second compressor, 5-expander, 51-throttle valve, 52-gas collecting cavity, 53-carbon dioxide exhaust port and 6-gas storage tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the scope of the present invention.
Examples
As shown in fig. 1, the carbon dioxide flooding oilfield associated gas recovery device comprises a separation tank 1, an absorption liquid storage device, a first compressor 3, a second compressor 4 and an expander 5, wherein the separation tank 1 is used for storing absorption liquid for realizing carbon dioxide separation; the absorption liquid storage device is communicated with the separation tank 1, so that the cyclic utilization of the absorption liquid is realized; the absorption liquid storage device comprises a heating device 21 for heating the absorption liquid; the first compressor 3 is connected with the separation tank 1 and is used for compressing the gas after the carbon dioxide is separated; the second compressor 4 is connected with the absorption liquid storage device and is used for compressing carbon dioxide generated after the absorption liquid storage device is heated; the expansion machine 5 is connected with the second compressor 4, the expansion machine 5 comprises a throttle valve 51 and a gas collecting cavity 52, the throttle valve 51 is connected with the second compressor 4 and the gas collecting cavity 52, and the gas collecting cavity 52 is used for cooling the gas compressed by the first compressor 3.
In the scheme, the associated gas recovery device comprises a separation tank 1, an absorption liquid storage device, a first compressor 3, a second compressor 4 and an expander 5, wherein the separation tank 1 is used for storing absorption liquid for realizing carbon dioxide separation, the oilfield associated gas is introduced into the recovery tank, the associated gas absorbs carbon dioxide in the associated gas through the absorption effect of the absorption liquid to realize the separation of methane and carbon dioxide, and the methane enters the first compressor 3 through the separation tank 1 to be compressed; the separation tank 1 is communicated with an absorption liquid storage device, absorption liquid enters the absorption liquid storage device, the absorption liquid storage device comprises a heating device 21, the absorption liquid after absorbing carbon dioxide is heated to produce carbon dioxide, the generated carbon dioxide enters a second compressor 4 to be compressed, and the absorption liquid after separating out the carbon dioxide only enters the separation tank 1 through a circulation loop to realize the cyclic utilization of the absorption liquid; the expander 5 including choke valve 51 and gas collecting cavity 52 is arranged to the exit end of second compressor 4, and second compressor 4 passes through choke valve 51 and connects gas collecting cavity 52, and after the carbon dioxide after the compression passed through choke valve 51, the volume expansion, realize based on the cryogenic principle of inflation, the temperature of carbon dioxide reduces, gets into in the gas collecting cavity 52, cools off the methane after compressing through first compressor 3 as the cold source, realizes the recovery of oil field associated gas, and environmental protection economy does not have the production of waste liquid and waste gas.
Preferably, the expanding agent is a heat insulating material for realizing adiabatic expansion of the carbon dioxide.
Preferably, recovery unit still includes two vapour and liquid separators that are used for guaranteeing the gaseous dry gas-liquid separation after the separation, a vapour and liquid separator connects knockout drum 1 and first compressor 3, another vapour and liquid separator connects knockout drum 1 and second compressor 4, guarantees through the aridity of the gaseous after the absorption liquid separation, has guaranteed first compressor 3 and second compressor 4's life through setting up vapour and liquid separator.
As shown in fig. 1, the absorption liquid storage device further includes a heat conducting member 22, the heat conducting member 22 is connected to the first compressor 3, the second compressor 4 and the heating device 21, and is used for transferring heat generated by the first compressor 3 and the second compressor 4 to the heating device 21, and by arranging the heat conducting member 22, cyclic utilization of heat generated in the compression process of the compressors is realized, energy is saved, environmental protection is achieved, and reasonable application of resources is further realized.
As shown in fig. 2, the separation tank 1 further comprises a spraying device 11, the spraying device 11 is connected with an absorption liquid storage device, and the spraying device 11 is arranged to spray the absorption liquid, so that the separation effect of associated gas is further ensured, and the sufficient separation of carbon dioxide and methane is ensured.
Preferably, spray set 11 is the ring pipe, the inboard and the outside of ring pipe all set up a plurality of shower nozzles, spray set 11 is the ring pipe, and all set up the shower nozzle including the outside, realize the spraying of knockout drum 1's cross-sectional area, further guaranteed the separation effect of associated gas, guarantee the abundant separation of carbon dioxide and methane.
In the scheme, the absorption liquid is a calcium carbonate mixed liquid, calcium carbonate absorbs excessive carbon dioxide to produce calcium bicarbonate by adopting the calcium carbonate mixed liquid, the calcium bicarbonate is easy to decompose to produce carbon dioxide and calcium carbonate, and the cyclic utilization of the absorption liquid is realized.
Preferably, the absorption liquid storage device further comprises a stirring device, wherein the stirring device stirs the calcium carbonate mixed liquid in the absorption liquid storage device to ensure that the calcium carbonate is uniformly distributed in the liquid, and then the calcium carbonate enters the separation tank 1 through a pipeline.
Preferably, the absorption liquid storage device further comprises a filter member 23, an absorption liquid inlet pipe 24; the absorption liquid enters the absorption liquid storage device through the absorption liquid inlet pipe 24 after absorbing carbon dioxide; the filter piece 23 is arranged at the absorption liquid inlet pipe 24 and used for filtering calcium carbonate in the separation tank 1, and calcium carbonate is filtered by arranging a filter layer, so that only calcium bicarbonate solution is allowed to enter the absorption liquid storage device through the inlet pipe.
As shown in fig. 1, the expander 5 further includes a carbon dioxide exhaust port 53, the carbon dioxide exhaust port 53 is used for introducing the separated carbon dioxide into the oil recovery circuit to realize the recycling of the carbon dioxide, and the carbon dioxide exhaust port 53 is provided to avoid the emission of the carbon dioxide and realize the recycling of the carbon dioxide.
As shown in fig. 1, the gas storage tank 6 is further included, the gas storage tank 6 is connected to the first compressor 3, the gas storage tank 6 is used for collecting the gas cooled by the gas collection cavity 52, the separated methane is stored by the gas storage tank 6, and the gas is transported in a tank after a certain amount of methane is stored.
Preferably, the gas storage tank 6 further comprises a one-way valve for supplying gas to the external gas collecting bottle, and the transportation of methane is realized by arranging the one-way valve.
As shown in fig. 1, the first compressor 3 is connected to the gas storage tank 6 through a pipeline, and the pipeline is covered by the expansion agent gas collection cavity 52, so as to reduce the temperature of methane in the pipeline.
Preferably, the pipeline is internally provided with a buffer member, and the buffer member is used for reducing the flow velocity of gas and ensuring sufficient cooling of the gas.
Preferably, the conduit is configured as a spiral tube to ensure the time for the separated gas to be in the gas collecting chamber 52 and to ensure sufficient cooling of the gas.
Preferably, a condensing element is further disposed in the expansion agent gas-collecting cavity 52, so as to further ensure the condensing efficiency and realize the condensation of the separated gas.
The invention also discloses a use method of the carbon dioxide flooding oilfield associated gas recovery device, the calcium carbonate mixed solution is used as the absorption liquid, the calcium bicarbonate solution can be produced after the carbon dioxide is fully absorbed, the calcium carbonate mixed solution is used as the absorption liquid, the calcium carbonate mixed solution fully absorbs the carbon dioxide and then produces the calcium bicarbonate solution, the calcium bicarbonate solution is easily decomposed by heating, the calcium carbonate is separated out again and mixed with water to form the calcium carbonate mixed solution, and the recycling of the absorption liquid is realized.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A carbon dioxide flooding oilfield associated gas recovery device is characterized by comprising a separation tank (1), an absorption liquid storage device (2), a first compressor (3), a second compressor (4) and an expander (5),
the separation tank (1) is used for storing absorption liquid for realizing carbon dioxide separation;
the absorption liquid storage device (2) is communicated with the separation tank (1) to realize the cyclic utilization of the absorption liquid;
the absorption liquid storage device (2) comprises a heating device (21) for heating the absorption liquid;
the first compressor (3) is connected with the separation tank (1) and is used for compressing the gas after the carbon dioxide is separated;
the second compressor (4) is connected with the absorption liquid storage device (2) and is used for compressing carbon dioxide generated after the absorption liquid storage device (2) is heated;
the expansion machine (5) is connected with the second compressor (4), the expansion machine (5) comprises a throttle valve (51) and a gas collecting cavity (52), the throttle valve is connected with the second compressor (4) and the gas collecting cavity (52), and the gas collecting cavity (52) is used for cooling gas compressed by the first compressor (3).
2. The carbon dioxide driven oilfield associated gas recovery device according to claim 1, wherein the absorption liquid storage device (2) further comprises a heat conducting member (22), and the heat conducting member (22) is connected with the first compressor (3), the second compressor (4) and the heating device (21) and is used for transferring heat generated by the first compressor (3) and the second compressor (4) to the heating device (21).
3. The carbon dioxide flooding oilfield associated gas recovery device according to claim 1, wherein the separation tank (1) further comprises a spraying device (11), and the spraying device (11) is connected with the absorption liquid storage device (2).
4. The carbon dioxide flooding oilfield associated gas recovery device according to claim 3, wherein the spraying device (11) is an annular pipe, and a plurality of spray heads are arranged on the inner side and the outer side of the annular pipe.
5. A carbon dioxide driven oilfield associated gas recovery device according to claim 1, wherein the absorption liquid storage device (2) further comprises a filter element (23), an absorption liquid inlet pipe (24); the absorption liquid enters the absorption liquid storage device (2) through the absorption liquid inlet pipe (24) after absorbing the carbon dioxide; the filter element (23) is arranged at the absorption liquid inlet pipe (24).
6. A carbon dioxide driven oilfield associated gas recovery device according to claim 1, wherein the expander (5) further comprises a carbon dioxide exhaust port (53), and the carbon dioxide exhaust port (53) is used for introducing the separated carbon dioxide into the oil recovery circuit to recycle the carbon dioxide.
7. The carbon dioxide flooding oilfield associated gas recovery device according to claim 1, further comprising a gas storage tank (6), wherein the gas storage tank (6) is connected with the first compressor (3), and the gas storage tank (6) is used for collecting the gas cooled by the gas collection cavity (52).
8. The carbon dioxide flooding oilfield associated gas recovery device according to claim 7, wherein the gas storage tank (6) further comprises a one-way valve for supplying gas to the external gas collection bottle.
9. The carbon dioxide driven oilfield associated gas recovery device according to claim 1, further comprising two gas-liquid separators for ensuring the dryness of the separated gas, wherein one gas-liquid separator connects the separation tank (1) and the first compressor (3), and the other gas-liquid separator connects the separation tank (1) and the second compressor (4).
10. The use method of the carbon dioxide flooding oilfield associated gas recovery device according to any one of claims 1 to 9, wherein the absorption liquid is a calcium carbonate mixed liquid.
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Cited By (5)
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| CN113521945A (en) * | 2021-07-14 | 2021-10-22 | 赵聪 | Gas recovery processing device for carbon dioxide oil displacement |
| CN113679970A (en) * | 2021-08-10 | 2021-11-23 | 曹爱秋 | Compressed oxygen self-rescuer for mine |
| CN116099333A (en) * | 2023-04-13 | 2023-05-12 | 清华四川能源互联网研究院 | Produced gas chemical method carbon capture system |
| CN116556909A (en) * | 2023-04-19 | 2023-08-08 | 中国石油天然气股份有限公司 | Device and method for efficient separation and cyclic reinjection utilization of carbon dioxide flooding |
| CN117264676A (en) * | 2023-10-07 | 2023-12-22 | 江苏万兴石油装备有限公司 | Associated gas treatment device containing carbon dioxide |
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