CN217479386U - Shale oil associated gas recovery system rich in carbon dioxide - Google Patents
Shale oil associated gas recovery system rich in carbon dioxide Download PDFInfo
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- CN217479386U CN217479386U CN202221072788.3U CN202221072788U CN217479386U CN 217479386 U CN217479386 U CN 217479386U CN 202221072788 U CN202221072788 U CN 202221072788U CN 217479386 U CN217479386 U CN 217479386U
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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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- 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
Abstract
The utility model relates to a shale oil associated gas recovery system rich in carbon dioxide, which comprises a feed gas compressor unit sledge, a CNG compressor unit sledge, a carbon dioxide booster unit sledge, a dehydration drying sledge, a mixed hydrocarbon separation sledge and a membrane separation sledge; the dehydration drying sledge comprises a first drying tower, a second drying tower, a third drying tower, a regenerated gas heater, a regenerated gas cooler and a regenerated gas separator; the mixed hydrocarbon separation sledge comprises a heat exchanger, a low-temperature separator, a mixed hydrocarbon separator and a refrigeration compressor set, and the membrane separation sledge comprises a membrane separator. The shale oil associated gas recovery system rich in carbon dioxide can not only produce hydrocarbon mixture and Compressed Natural Gas (CNG) products, but also recover and produce high-pressure liquid carbon dioxide, and realize circulating oil displacement.
Description
Technical Field
The utility model relates to a shale oil associated gas processing technique, specifically say, relate to a shale oil associated gas recovery system who is rich in carbon dioxide.
Background
Shale oil refers to a petroleum resource contained in a shale layer system mainly composed of shale. The shale oil associated gas refers to associated gas which is rich in methane, ethane, propane, butane and hydrocarbon components above the methane, the ethane, the propane and the butane and is produced in association with the shale oil production process, and is a useful natural gas resource. Because shale layers have deep geology and large pressure, a high-pressure cracking oil displacement method is generally adopted, for example, a supercritical liquid carbon dioxide oil displacement technology is adopted to mine shale oil, so that the generated associated gas is rich in carbon dioxide, the utilization value of the shale oil associated gas is reduced, the shale oil associated gas is generally directly burnt and discharged by a torch, natural gas resource waste is caused, the environment pollution is caused, and the shale oil displacement method does not meet the national environmental protection requirement.
In view of the above situation, there is a need to develop a carbon dioxide-rich shale oil associated gas recovery system to improve the use value of shale oil associated gas.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a shale oil associated gas recovery system that is rich in carbon dioxide that structural design is reasonable, the system is perfect.
The utility model provides a technical scheme that above-mentioned problem adopted is: a shale oil associated gas recovery system rich in carbon dioxide which characterized in that: comprises a raw gas compressor unit sledge, a CNG compressor unit sledge, a carbon dioxide booster unit sledge, a dehydration drying sledge, a mixed hydrocarbon separation sledge and a membrane separation sledge; the dehydration drying sledge comprises a first drying tower; the mixed hydrocarbon separation sledge comprises a heat exchanger, a low-temperature separator and a mixed hydrocarbon separator, and the membrane separation sledge comprises a membrane separator; a channel A1, a channel A2 and a channel A3 are arranged in the heat exchanger; the gas inlet of the feed gas compressor unit sledge is connected with a first pipeline for introducing shale oil associated gas, and the gas outlet of the feed gas compressor unit sledge is communicated with the gas inlet at the bottom of the first drying tower through a second pipeline; the top air outlet of the first drying tower is communicated with the inlet end of a channel A2 of the heat exchanger through a third pipeline, the outlet end of a channel A2 is communicated with the air inlet of the low-temperature separator, the top air outlet of the low-temperature separator is communicated with a channel A1, a channel A1 is communicated with the air inlet of the membrane separator, the top air outlet of the membrane separator is communicated with a Compressed Natural Gas (CNG) compressor unit sledge, and the bottom air outlet of the membrane separator is communicated with a carbon dioxide booster unit sledge; the bottom liquid outlet of the low-temperature separator is communicated with a channel A3, a channel A3 is communicated with the inlet end of the mixed hydrocarbon separator, the top gas outlet of the mixed hydrocarbon separator is communicated with the gas inlet of the membrane separator, and the bottom liquid outlet of the mixed hydrocarbon separator is connected with a heavy hydrocarbon product output pipeline.
Preferably, the dehydration drying skid further comprises a second drying tower, a third drying tower, a regenerated gas heater, a regenerated gas cooler and a regenerated gas separator; the top air outlets of the first drying tower, the second drying tower and the third drying tower are communicated with the inlet end of a channel A2 of the heat exchanger through a third pipeline; the second pipeline is also communicated with air inlets at the bottoms of the second drying tower and the third drying tower; bottom air inlets of the first drying tower, the second drying tower and the third drying tower are communicated with a regenerated gas input pipeline, and the regenerated gas input pipeline is communicated with the second pipeline; the top gas outlets of the first drying tower, the second drying tower and the third drying tower are communicated with a regenerated gas output pipeline, the regenerated gas heater is installed on the regenerated gas output pipeline, the top gas outlets of the first drying tower, the second drying tower and the third drying tower are communicated with a heated regenerated gas input pipeline, and the regenerated gas output pipeline is communicated with the heated regenerated gas input pipeline; the bottom air inlets of the first drying tower, the second drying tower and the third drying tower are communicated with a heating regenerated gas output pipeline, the regenerated gas cooler is installed on the heating regenerated gas output pipeline, the output end of the heating regenerated gas output pipeline is communicated with the air inlet of the regenerated gas separator, the top air outlet of the regenerated gas separator is communicated with the bottom air inlets of the first drying tower, the second drying tower and the third drying tower through a fourth pipeline, and the bottom liquid outlet of the regenerated gas separator is connected with a free water output pipeline.
Preferably, the second pipeline is provided with a first regulating valve.
Preferably, the hydrocarbon mixture separation skid further comprises a refrigeration compressor unit, the inside of the heat exchanger is further provided with a passage a4, the outlet end of the refrigeration compressor unit is communicated with the inlet end of the passage a4, an expansion valve is arranged on the communication pipeline of the refrigeration compressor unit, and the outlet end of the passage a4 is communicated with the inlet end of the refrigeration compressor unit.
Compared with the prior art, the utility model, have following advantage and effect: the shale oil associated gas recovery system rich in carbon dioxide can not only produce hydrocarbon mixture and Compressed Natural Gas (CNG) products, but also recover and produce high-pressure liquid carbon dioxide, and realize circulating oil displacement.
Drawings
In order to illustrate the embodiments of the present invention or the solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive work.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Description of the reference numerals: a raw material gas compressor unit sledge 1; a first drying tower 2; a second drying tower 3; a third drying tower 4; a regeneration gas heater 5; a regeneration gas cooler 6; a regeneration gas separator 7; a heat exchanger 8; a cryogenic separator 9; a hydrocarbon mixture separator 10; a refrigeration compressor train 11; a membrane separator 12; a CNG compressor train skid 13; a carbon dioxide booster train skid 14; a first pipe 15; line number two 16; line number three 17; a heavy hydrocarbon product outlet line 18; a regeneration gas input line 19; a regeneration gas output line 20; a heating regeneration gas input line 21; a heating regeneration gas output line 22; line four 23; a free water output line 24; a first regulating valve 25; an expansion valve 26; a dehydration drying sledge 61; a mixed hydrocarbon separation skid 62; membrane separation skid 63.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings by way of examples, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
See fig. 1.
The embodiment discloses a shale oil associated gas recovery system rich in carbon dioxide, which comprises a feed gas compressor unit sledge 1, a CNG compressor unit sledge 13, a carbon dioxide booster unit sledge 14, a dehydration drying sledge 61, a hydrocarbon mixture separation sledge 62 and a membrane separation sledge 63, wherein the six parts are arranged on a moving vehicle plate in a sledge manner to process and recover far shale oil associated gas, and the dehydration drying sledge 61 comprises a first drying tower 2, a second drying tower 3, a third drying tower 4, a regenerated gas heater 5, a regenerated gas cooler 6 and a regenerated gas separator 7; the mixed hydrocarbon separation sledge 62 comprises a heat exchanger 8, a cryogenic separator 9, a mixed hydrocarbon separator 10 and a refrigeration compressor unit 11, wherein the heat exchanger 8 adopts a four-channel aluminum plate-fin heat exchanger, and a channel A1, a channel A2, a channel A3 and a channel A4 are arranged in the mixed hydrocarbon separation sledge; the membrane separation skid 63 includes a membrane separator 12.
In this embodiment, the feed gas compressor train skid 1, the CNG compressor train skid 13, and the carbon dioxide booster train skid 14 employ reciprocating compressors, and the refrigeration compressor train 11 employs screw compressors. The first drying tower 2, the second drying tower 3 and the third drying tower 4 are identical in structure, different adsorbents are filled in the first drying tower 2, the second drying tower 3 and the third drying tower 4, and phi 8-phi 6 ceramic balls, C-type silica gel, 3A-type molecular sieves and phi 6-phi 8 ceramic balls are sequentially filled from bottom to top.
In this embodiment, feed gas compressor unit sledge 1 is used for carrying out pressure boost cooling to shale oil associated gas, and its air inlet is connected with a pipeline 15 that is used for letting in shale oil associated gas, and No. two pipeline 16 switch-ons are passed through with the bottom air inlet of a drying tower 2 to feed gas compressor unit sledge 1's gas outlet, and No. two pipeline 16 still switches-ons with the bottom air inlet of No. two drying towers 3 and No. three drying tower 4 two to install a governing valve 25 on No. two pipeline 16. Simultaneously, the bottom air inlets of the first drying tower 2, the second drying tower 3 and the third drying tower 4 are communicated with a regenerated gas input pipeline 19, the regenerated gas input pipeline 19 is communicated with a second pipeline 16, when the system works, shale oil associated gas is divided into two strands after being subjected to pressurization and cooling by a feed gas compressor unit sledge 1, one strand of the shale oil associated gas enters the drying tower to remove saturated water in the associated gas after the pressure of the shale oil associated gas is controlled by a regulating valve 25 to reach a dehydration and drying index, the other strand of the shale oil associated gas is taken as regenerated gas of the drying tower, the regenerated gas is introduced into the corresponding drying tower through the regenerated gas input pipeline 19, and the drying tower is regenerated.
In this embodiment, the top gas outlet of drying tower 2, No. two drying towers 3 and No. three drying tower 4 all with regeneration gas output pipeline 20 switch-on, regeneration gas heater 5 installs on regeneration gas output pipeline 20, the top gas outlet of drying tower 2, No. two drying towers 3 and No. three drying tower 4 all with heating regeneration gas input pipeline 21 switch-on, regeneration gas output pipeline 20 and the switch-on of heating regeneration gas input pipeline 21.
In this embodiment, the bottom air inlets of the first drying tower 2, the second drying tower 3 and the third drying tower 4 are all communicated with the heating regeneration gas output pipeline 22, the regeneration gas cooler 6 is installed on the heating regeneration gas output pipeline 22, the output end of the heating regeneration gas output pipeline 22 is communicated with the air inlet of the regeneration gas separator 7, the top air outlet of the regeneration gas separator 7 is communicated with the bottom air inlets of the first drying tower 2, the second drying tower 3 and the third drying tower 4 through a fourth pipeline 23, and the bottom liquid outlet of the regeneration gas separator 7 is connected with the free water output pipeline 24.
In this embodiment, the top air outlets of the first drying tower 2, the second drying tower 3 and the third drying tower 4 are communicated with the inlet end of the channel a2 of the heat exchanger 8 through the third pipeline 17. The outlet end of the channel A2 is communicated with the air inlet of the low-temperature separator 9, the top air outlet of the low-temperature separator 9 is communicated with the channel A1, the channel A1 is communicated with the air inlet of the membrane separator 12, the top air outlet of the membrane separator 12 is communicated with the CNG compressor unit sledge 13, and the bottom air outlet of the membrane separator 12 is communicated with the carbon dioxide booster unit sledge 14.
In this embodiment, the liquid outlet at the bottom of the cryogenic separator 9 is communicated with the channel A3, the channel A3 is communicated with the inlet end of the mixed hydrocarbon separator 10, the top gas outlet of the mixed hydrocarbon separator 10 is communicated with the gas inlet of the membrane separator 12, and the liquid outlet at the bottom of the mixed hydrocarbon separator 10 is connected with the heavy hydrocarbon product output pipeline 18.
In this embodiment, the outlet end of the refrigeration compressor set 11 is connected to the inlet end of the passage a4, the expansion valve 26 is installed on the connection pipe, and the outlet end of the passage a4 is connected to the inlet end of the refrigeration compressor set 11.
The specific working method of the shale oil associated gas recovery system rich in carbon dioxide comprises the following steps:
the method comprises the following steps: after being pressurized and cooled by a feed gas compressor unit sledge 1, the shale oil associated gas is divided into two strands, wherein one strand is subjected to pressure control by a first regulating valve 25 and then enters one of a first drying tower 2, a second drying tower 3 and a third drying tower 4 to remove saturated water in the associated gas, so that the dehydration and drying indexes are reached; the other strand of the regenerated gas is used as the regenerated gas of the drying tower, firstly, one drying tower which is not in adsorption operation among the first drying tower 2, the second drying tower 3 and the third drying tower 4 is cooled and swept, then, the regenerated gas is heated by a regenerated gas heater 5 and enters the other drying tower which is not in adsorption operation among the first drying tower 2, the second drying tower 3 and the third drying tower 4 for heating and regeneration, the regenerated gas enters a regenerated gas cooler 6 for cooling, the cooled gas enters a regenerated gas separator 7 for separating out free water, and the gas which is discharged from the regenerated gas separator 7 is mixed with the first strand of gas and then enters the drying tower again;
step two: the dried shale oil associated gas enters a channel A2 of a heat exchanger 8 for cooling, the shale oil associated gas from a channel A2 enters a low-temperature separator 9, liquid from the bottom of the low-temperature separator 9 returns to a channel A3 of the heat exchanger 8 to provide cold energy for the heat exchanger 8, the liquid from the channel A3 enters a hydrocarbon-mixed separator 10, and the liquid from the low temperature of the hydrocarbon-mixed separator 10 is used as a hydrocarbon-mixed product to be stored in an external storage tank;
step three: the gas from the top of the low-temperature separator 9 returns to a channel A1 of the heat exchanger 8 to provide cold energy for the heat exchanger 8, the gas from the channel A1 is mixed with the gas from the top of the hydrocarbon-mixed separator 10, and then the membrane separation sledge 63 is removed;
step four: from the bottom of the membrane separator 12 is permeate gas that readily penetrates the membrane, the main constituents being carbon dioxide and a small amount of methane; after being pressurized and cooled by a carbon dioxide pressurizing unit sledge 14, the permeation gas is changed into a liquid carbon dioxide product in a supercritical state, so that the cyclic oil displacement utilization of carbon dioxide is realized; from the top of the membrane separator 12, non-permeate gas, mainly methane, ethane, nitrogen, etc., which does not readily penetrate the membrane, exits; the non-permeate gas is pressurized and cooled by a CNG compressor unit sledge 13 to be used as a compressed natural gas CNG product;
step five: the cold quantity required by the heat exchanger 8 is provided by the refrigeration compressor unit 11, the refrigerant is compressed and cooled by the refrigeration compressor unit 11 to become liquid, the liquid refrigerant is throttled and refrigerated by the expansion valve 26 and returns to the channel A4 of the heat exchanger 8 to provide cold quantity for the heat exchanger, and the low-pressure refrigerant after vaporization and rewarming enters the refrigeration compressor unit 11 to realize circulating compression expansion refrigeration.
In the first step, the first drying tower 2, the second drying tower 3 and the third drying tower 4 work by adopting a three-tower switching process, for example, when the first drying tower 2 is saturated in water, the second drying tower 3 is switched to an adsorption state, the third drying tower 4 is switched to a cold blowing state and the first drying tower 2 is switched to a heating regeneration state through a program control valve; when the moisture absorbed by the second drying tower 3 is saturated, the third drying tower 4 is switched to an absorption state, the first drying tower 2 is switched to a cold blowing state, and the second drying tower 3 is switched to a heating regeneration state through a program control valve; when the third drying tower 4 is saturated in water, the first drying tower 2 is switched to an adsorption state, the second drying tower 3 is switched to a cold blowing state, and the third drying tower 4 is switched to a heating regeneration state through the program control valve, so that cyclic adsorption, heating regeneration and cooling are realized.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above contents described in the present specification are merely illustrative of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the patent idea of the utility model are included in the protection scope of the patent of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (4)
1. A shale oil associated gas recovery system rich in carbon dioxide which characterized in that: comprises a raw gas compressor set sledge (1), a CNG compressor set sledge (13), a carbon dioxide booster set sledge (14), a dehydration drying sledge (61), a mixed hydrocarbon separation sledge (62) and a membrane separation sledge (63);
the dehydration drying sledge (61) comprises a first drying tower (2);
the mixed hydrocarbon separation sledge (62) comprises a heat exchanger (8), a low-temperature separator (9) and a mixed hydrocarbon separator (10),
the membrane separation skid (63) comprises a membrane separator (12);
a channel A1, a channel A2 and a channel A3 are arranged in the heat exchanger (8);
the gas inlet of the raw gas compressor unit sledge (1) is connected with a first pipeline (15) for introducing shale oil associated gas, and the gas outlet of the raw gas compressor unit sledge (1) is communicated with the gas inlet at the bottom of the first drying tower (2) through a second pipeline (16);
the top air outlet of the first drying tower (2) is communicated with the inlet end of a channel A2 of a heat exchanger (8) through a third pipeline (17), the outlet end of a channel A2 is communicated with the air inlet of a low-temperature separator (9), the top air outlet of the low-temperature separator (9) is communicated with a channel A1, a channel A1 is communicated with the air inlet of a membrane separator (12), the top air outlet of the membrane separator (12) is communicated with a Compressed Natural Gas (CNG) compressor unit sledge (13), and the bottom air outlet of the membrane separator (12) is communicated with a carbon dioxide booster unit sledge (14);
a liquid outlet at the bottom of the low-temperature separator (9) is communicated with a channel A3, a channel A3 is communicated with an inlet end of the mixed hydrocarbon separator (10), a gas outlet at the top of the mixed hydrocarbon separator (10) is communicated with a gas inlet of the membrane separator (12), and a liquid outlet at the bottom of the mixed hydrocarbon separator (10) is connected with a heavy hydrocarbon product output pipeline (18).
2. The carbon dioxide-rich shale oil associated gas recovery system of claim 1, wherein: the dehydration drying sledge (61) further comprises a second drying tower (3), a third drying tower (4), a regenerated gas heater (5), a regenerated gas cooler (6) and a regenerated gas separator (7);
the top air outlets of the first drying tower (2), the second drying tower (3) and the third drying tower (4) are communicated with the inlet end of a channel A2 of the heat exchanger (8) through a third pipeline (17);
the second pipeline (16) is also communicated with the air inlets at the bottoms of the second drying tower (3) and the third drying tower (4);
the bottom air inlets of the first drying tower (2), the second drying tower (3) and the third drying tower (4) are communicated with a regenerated gas input pipeline (19), and the regenerated gas input pipeline (19) is communicated with a second pipeline (16);
the top gas outlets of the first drying tower (2), the second drying tower (3) and the third drying tower (4) are communicated with a regenerated gas output pipeline (20), the regenerated gas heater (5) is installed on the regenerated gas output pipeline (20), the top gas outlets of the first drying tower (2), the second drying tower (3) and the third drying tower (4) are communicated with a heating regenerated gas input pipeline (21), and the regenerated gas output pipeline (20) is communicated with the heating regenerated gas input pipeline (21);
the bottom air inlets of the first drying tower (2), the second drying tower (3) and the third drying tower (4) are communicated with a heating regenerated gas output pipeline (22), a regenerated gas cooler (6) is installed on the heating regenerated gas output pipeline (22), the output end of the heating regenerated gas output pipeline (22) is communicated with the air inlet of a regenerated gas separator (7), the top air outlet of the regenerated gas separator (7) is communicated with the bottom air inlets of the first drying tower (2), the second drying tower (3) and the third drying tower (4) through a fourth pipeline (23), and the bottom liquid outlet of the regenerated gas separator (7) is connected with a free water output pipeline (24).
3. The carbon dioxide enriched shale oil associated gas recovery system of claim 1, wherein: and a first regulating valve (25) is arranged on the second pipeline (16).
4. The carbon dioxide-rich shale oil associated gas recovery system of claim 1, wherein: the mixed hydrocarbon separation sledge (62) further comprises a refrigeration compressor set (11), a channel A4 is further arranged inside the heat exchanger (8), the outlet end of the refrigeration compressor set (11) is communicated with the inlet end of the channel A4, an expansion valve (26) is mounted on a communicating pipeline of the refrigeration compressor set, and the outlet end of the channel A4 is communicated with the inlet end of the refrigeration compressor set (11).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221072788.3U CN217479386U (en) | 2022-04-29 | 2022-04-29 | Shale oil associated gas recovery system rich in carbon dioxide |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221072788.3U CN217479386U (en) | 2022-04-29 | 2022-04-29 | Shale oil associated gas recovery system rich in carbon dioxide |
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| CN217479386U true CN217479386U (en) | 2022-09-23 |
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