CN115898345A - Carbon dioxide-containing gas reservoir development system - Google Patents
Carbon dioxide-containing gas reservoir development system Download PDFInfo
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- CN115898345A CN115898345A CN202110904214.1A CN202110904214A CN115898345A CN 115898345 A CN115898345 A CN 115898345A CN 202110904214 A CN202110904214 A CN 202110904214A CN 115898345 A CN115898345 A CN 115898345A
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- carbon dioxide
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- gas reservoir
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- gas
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 238
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 119
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 119
- 239000007789 gas Substances 0.000 claims abstract description 81
- 238000002347 injection Methods 0.000 claims abstract description 77
- 239000007924 injection Substances 0.000 claims abstract description 77
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000003345 natural gas Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004215 Carbon black (E152) Substances 0.000 claims description 5
- 229930195733 hydrocarbon Natural products 0.000 claims description 4
- 150000002430 hydrocarbons Chemical class 0.000 claims description 4
- 238000011084 recovery Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 7
- 239000008398 formation water Substances 0.000 description 7
- 238000009933 burial Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 230000005465 channeling Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
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- Physical Or Chemical Processes And Apparatus (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention discloses a carbon dioxide-containing gas reservoir development system, which comprises a development well, a carbon dioxide injection well and a treatment plant, wherein the development well is a carbon dioxide injection well; the output end of the development well is connected with the input end of the treatment plant, the output end of the treatment plant is used for treating the development well and is connected with the input end of the carbon dioxide injection well, and the carbon dioxide injection well is used for injecting carbon dioxide into the stratum; the carbon dioxide injection well is arranged in the gas-containing space of the gas reservoir near the gas-water interface area, and the buried depth of the carbon dioxide injection well is greater than that of the exploitation well. The method can recover carbon dioxide and displace natural gas to improve the recovery ratio, and realize the efficient development of the carbon dioxide-containing gas reservoir.
Description
Technical Field
The invention belongs to the field of gas field development, and relates to a carbon dioxide-containing gas reservoir development system.
Background
Compared with the conventional gas reservoir, the development of the carbon dioxide-containing gas reservoir needs to recover and treat carbon dioxide in gas, the common method is to purify the carbon dioxide to be sold as a commodity, or the carbon dioxide is injected into a stratum nearby, and the latter is the common method of the current gas reservoir, so that the additional cost investment is correspondingly increased. Meanwhile, the development of the gas reservoir needs to adopt a certain means to inhibit the rapid coning of the formation water and prolong the anhydrous gas production period of the gas reservoir, and the common method is to design a drainage well in the gas reservoir to guide the water invasion direction and weaken the energy of the formation water body, but the implementation engineering amount is large and uneconomic.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a carbon dioxide-containing gas reservoir development system which can recover carbon dioxide and replace natural gas for exploitation to improve the recovery ratio and realize the efficient development of the carbon dioxide-containing gas reservoir.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a carbon dioxide-containing gas reservoir development system comprises a development well, a carbon dioxide injection well and a treatment plant;
the output end of the development well is connected with the input end of the treatment plant, the treatment plant is used for treating the output end of the development well and is connected with the input end of the carbon dioxide injection well, and the carbon dioxide injection well is used for injecting carbon dioxide into the stratum;
the carbon dioxide injection well is arranged in the gas-containing space of the gas reservoir near the gas-water interface area, and the buried depth of the carbon dioxide injection well is greater than that of the exploitation well.
Preferably, the carbon dioxide injection well has a buried depth of greater than 1000m.
Preferably, the development wells are spaced at least 800m from the carbon dioxide injection wells.
Preferably, a booster is provided between the treatment plant and the carbon dioxide injection well.
Preferably, the carbon dioxide injection well adopts a vertical well, an inclined well or a horizontal well.
Preferably, the carbon dioxide injection well comprises a wellhead assembly, a hydrocarbon reservoir casing, an injection string, a separator, an injection valve, and a perforation zone;
the oil-gas layer casing is buried underground, the wellhead device is communicated with the oil-gas layer casing, the injection pipe column is sleeved in the oil-gas layer casing, an annular space is formed in the oil-gas layer casing between the injection pipe column sleeves, the separator is arranged in the annular space and forms a closed space with the annular space, the injection valve is arranged on the injection pipe column, and the perforation section is arranged on the oil-gas layer casing.
Further, the number of the separators, the injection valves and the perforation sections is the same, and the separators, the injection valves and the perforation sections are all provided in a plurality.
Further, the perforation section length is greater than 800m.
Compared with the prior art, the invention has the following beneficial effects:
the method is implemented by combining the carbon dioxide injection well and the development well in the gas reservoir space, the carbon dioxide is separated from the exploited gas and injected into the gas-bearing space of the gas reservoir close to the gas-water interface area, so that the carbon dioxide is recovered and buried in the development process of the gas reservoir containing the carbon dioxide, meanwhile, the underground carbon dioxide inhibits the rapid coning of formation water, and displaces natural gas to flow to the development well, thereby improving the recovery ratio of the gas reservoir.
Furthermore, the carbon dioxide has special physical properties, the critical temperature of the carbon dioxide is 31.26 ℃, the critical pressure of the carbon dioxide is 7.43MPa, the temperature and the pressure of a gas reservoir with the burial depth of more than 1000 meters are both greater than the critical value of the carbon dioxide, the burial and the displacement of the carbon dioxide are both in a supercritical state, and the carbon dioxide has higher specific gravity, viscosity and solubility and is easier to flow in rock pores and displace natural gas.
Furthermore, the distance between the development well and the carbon dioxide injection well is at least 800m, so that the carbon dioxide injection well and the development well are prevented from being mutually crossed in a too early period to influence the carbon dioxide displacement range.
Further, the booster can introduce carbon dioxide into the carbon dioxide injection well under pressure, facilitating carbon dioxide sequestration.
Further, the space combination of a plurality of separators, filling valve and perforation section, a plurality of filling valves can set up different opening pressure, and different carbon dioxide injection pressure of control through the wellhead assembly can a plurality of filling valves open, realizes that a plurality of perforation sections inject carbon dioxide to the gas reservoir space simultaneously.
Furthermore, the length of the perforation section is larger than 800m, and the underground distribution effect of carbon dioxide is improved.
Drawings
FIG. 1 is a connection diagram of a development system of the present invention;
FIG. 2 is a schematic diagram of a spatial structure of the development system of the present invention;
FIG. 3 is a schematic representation of a carbon dioxide injection well of the present invention as a vertical well;
FIG. 4 is a schematic representation of a carbon dioxide injection well of the present invention as a horizontal well;
FIG. 5 is a schematic diagram illustrating the effects of the development system of the present invention.
Wherein: 1-earth surface; 2-gas-water interface; 3-a development well; 4-a carbon dioxide injection well; 41-wellhead assembly; 42-hydrocarbon reservoir casing; 43-an injection column; 44-a separator; 45-a fill valve; 46-a perforation section; 5-treatment plant; 6-a supercharger; 7-market; 8-pipeline.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the development of the gas reservoir containing carbon dioxide needs to recover and treat the carbon dioxide in the gas, and meanwhile, effective measures are taken to inhibit formation water from rapidly coning so as to prolong the anhydrous gas production period of the gas reservoir. In view of the special physical properties of carbon dioxide under the critical temperature and pressure condition, the invention designs the specific arrangement and combination relationship of the development well 3 and the carbon dioxide injection well 4 in the gas reservoir space, realizes the recovery of carbon dioxide injected into the gas reservoir, and simultaneously can inhibit the rapid coning of formation water after being mixed with the gas reservoir, and simultaneously can displace natural gas to improve the recovery ratio and realize the efficient development of the gas reservoir containing carbon dioxide.
The carbon dioxide-containing gas reservoir development system comprises a development well 3, a carbon dioxide injection well 4, a treatment plant 5 and a pressurization station.
As shown in figure 1, the output end of a development well 3 is connected with the input end of a treatment plant 5, the treatment plant 5 is used for treating natural gas produced by the development well 3 and simultaneously separating carbon dioxide, the output end of the treatment plant 5 is connected with the input end of a pressurizing station and a market 7, a booster 6 is arranged in the pressurizing station, the output end of the pressurizing station is connected with the input end of a carbon dioxide injection well 4, and the carbon dioxide injection well 4 is used for injecting carbon dioxide into a stratum.
The connections are all connected by a pipeline 8, with the treatment plant 5 and booster station at the surface 1, the development well 3 and carbon dioxide injection well 4 buried underground.
The carbon dioxide-containing natural gas existing in the gas reservoir is conveyed to the ground by using a development well 3, is conveyed to a treatment plant 5 through a pipeline 8 for separation and treatment, the qualified natural gas is conveyed to a market 7, the separated carbon dioxide is conveyed to a pressurizing station and is conveyed to a carbon dioxide injection well 4 after being pressurized, and the carbon dioxide is injected into the gas reservoir by using the carbon dioxide to realize recovery treatment.
As shown in FIG. 2, the exploitation well 3 is located at the center of the gas reservoir, the carbon dioxide injection well 4 is arranged in the gas-containing space of the gas reservoir near the gas-water interface 2 and is located at the side of the exploitation well 3 group, and the depth of the carbon dioxide injection well 4 is greater than that of the exploitation well 3.
The development well 3 is arranged at a higher position in the gas-containing space of the gas reservoir, the carbon dioxide injection well 4 is arranged at a position close to the gas-water interface 2 in the gas-containing space of the gas reservoir, the development well 3 and the carbon dioxide injection well 4 have a certain spatial distance, the distance between the development well 3 and the carbon dioxide injection well 4 is at least 800m, and premature channeling of the carbon dioxide injection well 4 and the development well 3 is avoided and the range of carbon dioxide displacement is improved.
The carbon dioxide has special physical properties, the critical temperature of the carbon dioxide is 31.26 ℃, the critical pressure of the carbon dioxide is 7.43MPa, the temperature and the pressure of a gas reservoir with the burial depth of more than 1000 meters are both greater than the critical value of the carbon dioxide, the burial and the displacement of the carbon dioxide are both in a supercritical state, the carbon dioxide has higher specific gravity, viscosity and solubility, and the carbon dioxide is easy to flow in rock pores and displace natural gas.
The gas reservoir can be an edge water gas reservoir or a bottom water gas reservoir, and does not limit the implementation method; the development well 3 and the carbon dioxide injection well 4 can be a vertical well, an inclined well and a horizontal well, are not limited by well types, can be 1 well or a plurality of wells, and are not limited by quantity.
As shown in fig. 3 and 4, the carbon dioxide injection well 4 includes a wellhead 41, a hydrocarbon formation casing 42, an injection string 43, a separator 44, an injection valve 45, and a perforated section 46.
Oil gas layer sleeve pipe 42 buries underground, and wellhead assembly 41 communicates with oil gas layer sleeve pipe 42, and injection string 43 cover is established in oil gas layer sleeve pipe 42 to injection string 43 forms annular space between the cover in oil gas layer sleeve pipe 42, and divider 44 lays in annular space and forms the enclosure space with the annular space, and injection valve 45 lays on injection string 43, and perforation section 46 sets up on oil gas layer sleeve pipe 42.
The spatial combination of the separator 44, the injection valve 45 and the perforation section 46 can be 1 or more, the plurality of injection valves 45 can be set to different opening pressures, the opening of the 1 or more injection valves 45 can be realized by controlling different carbon dioxide injection pressures through the wellhead device 41, and the simultaneous injection of carbon dioxide into the gas reservoir space by the 1 or more perforation sections 46 is realized.
The length of the perforation section 46 is more than 800m, and the underground distribution effect of carbon dioxide is improved.
The carbon dioxide injection well 4 adopts a multi-stage injection mode, improves the injection amount and the spatial distribution range of the carbon dioxide, is favorable for preventing water layers from rapidly channeling water to a gas-containing space, and protects a gas reservoir from realizing anhydrous development.
As shown in fig. 5, the carbon dioxide injected into the gas reservoir through the carbon dioxide injection well 4 is in a critical state, has a specific gravity between that of natural gas and formation water, is not easy to rapidly enter the natural gas, and is enriched near the gas-water interface 2 of the gas reservoir to play a role in inhibiting rapid coning of the formation water. Meanwhile, the natural gas is continuously driven to flow to the position of the development well 3 along with the increase of the injection amount, so that the recovery ratio of the natural gas is improved, and the overall high-benefit development of the gas reservoir is realized.
It is also within the scope of this application to achieve enhanced recovery of a carbon dioxide reservoir by injecting external carbon dioxide gas into the carbon dioxide free reservoir, if the economics permit.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. A carbon dioxide-containing gas reservoir development system, characterized by comprising a development well (3), a carbon dioxide injection well (4) and a treatment plant (5);
the output end of the development well (3) is connected with the input end of a treatment plant (5), the treatment plant (5) is used for treating natural gas produced by the development well (3) and simultaneously separating carbon dioxide, the output end of the treatment plant (5) is connected with the input end of a carbon dioxide injection well (4), and the carbon dioxide injection well (4) is used for injecting carbon dioxide into the stratum;
the carbon dioxide injection well (4) is arranged in the area close to the gas-water interface (2) in the gas-containing space of the gas reservoir, and the buried well depth of the carbon dioxide injection well (4) is greater than that of the exploitation well (3).
2. The carbon dioxide bearing gas reservoir exploitation system according to claim 1, wherein the carbon dioxide injection well (4) has a well depth of more than 1000m.
3. The carbon dioxide-containing gas reservoir exploitation system according to claim 1, wherein the exploitation well (3) is spaced at least 800m from the carbon dioxide injection well (4).
4. The carbon dioxide-containing gas reservoir exploitation system according to claim 1, wherein a booster (6) is provided between the treatment plant (5) and the carbon dioxide injection well (4).
5. The carbon dioxide bearing gas reservoir exploitation system according to claim 1, wherein the carbon dioxide injection well (4) is a vertical well, an inclined well or a horizontal well.
6. The carbon dioxide bearing gas reservoir development system according to claim 1, characterized in that the carbon dioxide injection well (4) comprises a wellhead device (41), a hydrocarbon reservoir casing (42), an injection string (43), a separator (44), an injection valve (45) and a perforated section (46);
oil gas layer sleeve pipe (42) bury underground with the underground, well head device (41) and oil gas layer sleeve pipe (42) intercommunication, it establishes in oil gas layer sleeve pipe (42) to pour into tubular column (43) cover, and pour into tubular column (43) between the cover hydrocarbon layer sleeve pipe (42) and form annular space, divider (44) lay in the annular space and form enclosure space with the annular space, injection valve (45) lay on pour into tubular column (43), perforation section (46) set up on oil gas layer sleeve pipe (42).
7. The carbon dioxide-containing gas reservoir exploitation system according to claim 6, wherein the number of the separators (44), the injection valves (45) and the perforation segments (46) is the same and is provided in plurality.
8. The carbon dioxide bearing gas reservoir development system of claim 6, wherein the perforation segment (46) is greater than 800m in length.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110904214.1A CN115898345A (en) | 2021-08-06 | 2021-08-06 | Carbon dioxide-containing gas reservoir development system |
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| CN202110904214.1A CN115898345A (en) | 2021-08-06 | 2021-08-06 | Carbon dioxide-containing gas reservoir development system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117868758A (en) * | 2023-12-22 | 2024-04-12 | 中国海洋石油集团有限公司 | Development method of carbon-hydrocarbon resource coexistence gas field |
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| CN112499586A (en) * | 2020-12-02 | 2021-03-16 | 西南石油大学 | Method for realizing steam reforming hydrogen production by heating water-invaded gas reservoir stratum |
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2021
- 2021-08-06 CN CN202110904214.1A patent/CN115898345A/en active Pending
Patent Citations (8)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117868758A (en) * | 2023-12-22 | 2024-04-12 | 中国海洋石油集团有限公司 | Development method of carbon-hydrocarbon resource coexistence gas field |
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