CN116877198A - Large-scale helium storage method for underground salt cavern - Google Patents
Large-scale helium storage method for underground salt cavern Download PDFInfo
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- CN116877198A CN116877198A CN202310899973.2A CN202310899973A CN116877198A CN 116877198 A CN116877198 A CN 116877198A CN 202310899973 A CN202310899973 A CN 202310899973A CN 116877198 A CN116877198 A CN 116877198A
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- helium
- gas
- salt cavern
- underground salt
- storage
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- 239000001307 helium Substances 0.000 title claims abstract description 190
- 229910052734 helium Inorganic materials 0.000 title claims abstract description 190
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 title claims abstract description 190
- 150000003839 salts Chemical class 0.000 title claims abstract description 96
- 238000003860 storage Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000007789 gas Substances 0.000 claims abstract description 183
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 116
- 239000003345 natural gas Substances 0.000 claims abstract description 58
- 239000000203 mixture Substances 0.000 claims description 45
- 239000007788 liquid Substances 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 239000000126 substance Substances 0.000 abstract description 6
- 238000009792 diffusion process Methods 0.000 abstract description 4
- 239000011435 rock Substances 0.000 abstract description 4
- 235000019994 cava Nutrition 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 15
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 12
- 230000007774 longterm Effects 0.000 description 8
- 239000002808 molecular sieve Substances 0.000 description 8
- 230000018044 dehydration Effects 0.000 description 6
- 238000006297 dehydration reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to a large-scale helium storage method for an underground salt cavern, and belongs to the technical field of gas storage. The underground salt cavern large-scale helium storage method comprises the following steps: mixing helium with natural gas to form a mixed gas; and injecting the mixed gas into an underground salt cavern for storage. The method adopts salt caves to store national strategic substances on a large scale, has good tightness and stability, high safety and permanent storage; helium is mixed with natural gas, so that the diffusion of helium molecules and the leakage of rock stratum can be effectively prevented, and the escape of helium molecules is prevented to the maximum extent; the underground salt cavern large-scale helium storage method can effectively realize permanent storage of helium in the underground salt cavern and prevent escape of helium molecules in a minimum amount, and has high economic value and strong practicability.
Description
Technical Field
The invention belongs to the technical field of gas storage, and particularly relates to a large-scale helium storage method for underground salt caverns.
Background
According to USGS (US Geological Survey, united states geological agency) statistics, global helium supply was in an increased state as a whole by 2008, with annual production from 111X 106m in 1995 3 175×106m in 2008 3 . And after 2012, global helium production is in a concussive, slowly decreasing condition (mainly because of the reduced helium production in the united states). The total helium production of the 2016-year 6 main helium production countries is reduced to 154 multiplied by 106m 3 Wherein 85X 106m in the United states 3 Katal 50×106m 3 Alor and Siberian 10X 106m 3 Australian 4.5×106m 3 Russian 3×106m 3 Polish 2X 106m 3 。
In contrast to the slow decrease in global helium production, global helium demand is in a growing trend. From the data in 2020, with a substantial increase in the range of helium applications, particularly in the medical, industrial and electronics industries, global helium demand has grown at a rate of 4% to 6% per year. It was estimated that the global demand for helium was about 230×106m in 2016 3 The annual output of the method is 154 multiplied by 106m which is far greater than 2016 years 3 . This results in current global helium supply and demand, long-term shortages.
By 2017, the total amount of residual helium gas reserves has been ascertained to be 7.43×109m worldwide 3 . Wherein, the U.S. is 3.9X109 m 3 Alor 1.8X109 m in Australia 3 Russian 1.7X109 m 3 Polish 0.025X 109m 3 . If the helium production capacity is 154×106m from 2016 3 Initially, 5% increase annually, then the global helium reserves will be fully depleted by 2040 years. Therefore, it is imperative to strengthen the national helium resource strategic reserves.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a large-scale helium storage method for underground salt caverns. The underground salt cavern large-scale helium storage method can effectively realize permanent storage of helium in the underground salt cavern and prevent helium molecules from escaping to the minimum.
The technical scheme adopted by the invention is as follows.
A method of mass helium storage in an underground salt cavern, the method comprising:
mixing helium with natural gas to form a mixed gas;
and injecting the mixed gas into an underground salt cavern for storage.
Optionally, in the mixed gas, the volume ratio of the helium to the natural gas is 5%.
Optionally, the mixing helium with natural gas comprises:
delivering the helium and the natural gas to a gas mixing vessel, respectively;
determining the concentration of helium and the concentration of other gases than helium in the gas mixing vessel;
and respectively adjusting the flow rates of helium and natural gas which are delivered to the gas mixing container according to the determined concentration of helium in the gas mixing container and the determined concentration of other gases except helium.
Optionally, the method further comprises:
a gas pressure disturbance is generated in the gas mixing vessel to substantially fuse the gas in the gas mixing vessel.
Optionally, the method further comprises:
determining the pressure of the gas mixture injected into the underground salt cavern;
and adjusting the flow rate of the gas mixture injected into the underground salt cavern according to the pressure of the compressed gas mixture injected into the underground salt cavern.
Optionally, the method further comprises:
detecting the air pressure in the cavity of the underground salt cavern in the storage process of the mixed gas;
determining whether the air pressure in the cavity of the underground salt cavern is within a specified air pressure range;
and when the air pressure in the cavity of the underground salt cavern is not in the specified air pressure range, adjusting the air pressure in the cavity of the underground salt cavern.
Optionally, after injecting the mixture into a salt cavern for storage, the method further comprises:
injecting and extracting the mixed gas stored in the underground salt cavern;
helium is separated from the gas mixture produced by injection.
Optionally, before said mixing helium with natural gas, comprising:
converting the prepared liquid helium into the helium.
The invention has the following effects: forming a mixed gas by mixing helium with natural gas; injecting the mixed gas into an underground salt cavern for storage; the underground salt cavern has good tightness, the scale of the storage space is huge, the salt cavern is adopted for large-scale storage of national strategic substances, the underground salt cavern has good tightness and stability, the safety is high, and the underground salt cavern can be permanently stored; helium is mixed with natural gas, so that the diffusion of helium molecules and the leakage of rock stratum can be effectively prevented, and the escape of helium molecules is prevented to the maximum extent; the underground salt cavern large-scale helium storage method can effectively realize permanent storage of helium in the underground salt cavern and prevent escape of helium molecules in a minimum amount, and has high economic value and strong practicability.
Drawings
FIG. 1 is a flow chart of a method for large scale helium storage in an underground salt cavern according to an embodiment of the present invention;
FIG. 2 is a flow chart of yet another method for large scale helium storage in an underground salt cavern according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a gas mixing device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a wellhead valve set according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a helium separation device according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
Fig. 1 is a flowchart of a method for large-scale helium storage in an underground salt cavern according to an embodiment of the present invention, referring to fig. 1, the flow of the method for large-scale helium storage in an underground salt cavern includes the following steps.
And 11, mixing helium with natural gas to form mixed gas.
Illustratively, the volume ratio of helium to natural gas in the mixture may be 5%.
And step 12, injecting the mixed gas into an underground salt cavern for storage.
In the embodiment, helium is mixed with natural gas to form mixed gas; injecting the mixed gas into an underground salt cavern for storage; the underground salt cavern has good tightness, the scale of the storage space is huge, the salt cavern is adopted for large-scale storage of national strategic substances, the underground salt cavern has good tightness and stability, the safety is high, and the underground salt cavern can be permanently stored; helium is mixed with natural gas, so that the diffusion of helium molecules and the leakage of rock stratum can be effectively prevented, and the escape of helium molecules is prevented to the maximum extent; the underground salt cavern large-scale helium storage method can effectively realize permanent storage of helium in the underground salt cavern and prevent escape of helium molecules in a minimum amount, and has high economic value and strong practicability.
In addition, natural gas can be stored together with helium as an important strategic substance, and the underground salt cavern large-scale helium storage method additionally realizes long-term storage of natural gas while helium is stored.
Fig. 2 is a flow chart of yet another method for large-scale helium storage in an underground salt cavern according to an embodiment of the present invention, referring to fig. 2, the flow chart of the method for large-scale helium storage in an underground salt cavern includes the following steps.
Step 21, converting the prepared liquid helium into helium.
The liquid helium may be liquid helium stored in a helium tank truck.
Sources of liquid helium include: the method adopts the modes of purchasing helium remotely at low price or importing foreign helium at low price and the like, purchasing helium in large quantities at low price, filling a liquid helium standard tank through a professional helium tank truck so as to convert helium into liquid helium for storage, and then transporting the liquid helium to the vicinity of a salt cavern well site helium storage warehouse for long distance. Liquid helium is adopted for storage tank in the long-distance transportation process of the tank truck. The helium tank truck is not limited in structure, and the helium tank truck in the prior art can be adopted to realize the whole process operation monitoring of filling, storing and discharging of the liquid helium standard tank.
The way of converting liquid helium into helium includes: the liquid helium standard tank box in the tank truck is communicated through the helium gas input pipeline, so that liquid helium flows in the helium gas input pipeline. Liquid helium will slowly convert to helium as it flows in the helium gas inlet line.
Step 22, mixing helium with natural gas to form a mixed gas.
The source of the natural gas is the natural gas conveyed by a natural gas injection and production pipeline in a salt cavern well site where the helium reservoir is located.
This step 22 may include the following steps 221-223.
Step 221, delivering helium and natural gas to a gas mixing vessel respectively.
Fig. 3 is a schematic structural diagram of a gas mixing device according to an embodiment of the present invention. Referring to fig. 3, the gas mixing device includes a gas mixing vessel 31, a helium gas input pipe 32, a natural gas input pipe 33, and a mixed gas output pipe 34.
Helium gas is delivered to gas mixing vessel 31 using helium gas inlet line 32 and natural gas is delivered to gas mixing vessel 31 using natural gas inlet line 33.
One end of the helium gas input pipeline 32 is communicated with a liquid helium standard tank in the tank truck, and the other end of the helium gas input pipeline 32 is communicated with the gas mixing container 31. A helium valve 321 may be disposed between one end of the helium gas input line 32 and the tank wagon, and a helium gas flowmeter 322 may be disposed on the helium gas input line. The helium valve 321 is used for controlling the on-off of the gas path between the helium input pipeline 32 and the tank wagon. Helium flow meter 322 is used to control the flow of helium delivered by helium inlet line 32.
One end of the natural gas input pipeline 33 is communicated with a well site natural gas injection and production pipeline, and the other end of the natural gas input pipeline is communicated with the gas mixing container 31. A natural gas valve 331 may be disposed between one end of the natural gas input pipe 33 and the well site natural gas injection production pipe, and a natural gas flowmeter 332 may also be disposed on the natural gas input pipe 33. The natural gas valve 331 is used for controlling the on-off of a gas path between the natural gas input pipeline 33 and the natural gas injection and production pipeline. The natural gas flow meter 332 is used to control the amount of natural gas flow delivered by the natural gas input conduit 33.
The gas mixing vessel 31 may be an elongated vessel, and the connection of the helium gas input pipe 32 and the natural gas input pipe 33 with the gas mixing vessel 31 is located at one end of the gas mixing vessel, and the other end of the gas mixing vessel 31 is provided with a mixed gas output connection. In this way, uniform mixing of helium and natural gas is facilitated over a longer vessel space.
Step 222, determining the concentration of helium and the concentration of other gases than helium in the gas mixing vessel.
The gas mixing device further comprises a gas composition and concentration analyzer 35. The gas composition and concentration analyzer 35 may be mounted on the gas mixing vessel 31. The gas composition and concentration analyzer 35 may be used to monitor the gas molecular composition in the gas mixing vessel 31 in real time and calculate the concentration of helium and the composition concentration of other gas components.
The gas composition and concentration analyzer 35 may employ an analyzer for analyzing a gas composition and calculating a gas concentration in the related art.
And 223, respectively adjusting the flow rates of helium and natural gas which are delivered to the gas mixing container according to the determined concentration of helium and the concentration of other gases except helium in the gas mixing container.
Illustratively, the volume ratio of helium to natural gas in the mixture may be 5%.
The gas mixing device further comprises a first control module, the first control module is electrically connected with the gas component and the concentration analyzer, the natural gas flowmeter and the helium flowmeter respectively, and the first control module adjusts the opening and closing threshold values of the helium flowmeter and the natural gas flowmeter according to the concentration of helium fed back by the gas component and the concentration analyzer and the concentration of other gases except for helium, so that helium and natural gas in the mixed gas are mixed according to a certain proportion concentration, such as a volume ratio of 5%, stability of helium molecules is guaranteed, and leakage, leakage and overflow and the like of the helium in the underground long-term storage process are prevented.
The first control module may be a computer.
Optionally, this step 22 may further include step 224.
Step 224, generating a gas pressure disturbance in the gas mixing vessel to substantially uniformly fuse the gas in the gas mixing vessel.
The gas mixing device may further comprise a pneumatic pump 36, and the pneumatic pump 36 may be mounted on the gas mixing vessel 31. A pneumatic pump 36 is used to create a pneumatic disturbance in the gas within the gas mixing vessel 31.
The pneumatic pump is driven by electric power, and the inlet and the outlet are respectively communicated with the gas mixing container and are used for sucking the mixed gas from the inlet, applying a certain pressure to the sucked mixed gas and then outputting the mixed gas from the outlet to the gas mixing container. The mixed gas with certain pressure output by the outlet produces air pressure disturbance, so that the mixed gas in the gas container is fully and uniformly fused.
The pneumatic pump may be operated at a set rotational speed or may be operated repeatedly at intervals. For example, the pneumatic pump control valve is slowly twisted according to the pressure value, for example, 10MPa, in the gas mixing container, and then the control current is increased to increase the rotation speed of the pneumatic pump, so that the pneumatic pump is slowly rotated, and the rotation speed is controlled to be about 10 rpm. Or, the pneumatic pump is set to be automatically restarted every 3 minutes, and the pneumatic pump can be stopped after running for 1 minute after each start, and the next start is waited.
Alternatively, referring to fig. 3, one end of the mixture output pipe 34 is located at a mixture output connection provided at the other end of the gas mixing container 31 for achieving discharge of the standard concentration mixture. A mixed gas flowmeter 341 and a mixed gas pressure gauge 342 can be arranged on the mixed gas output pipeline 34, and the mixed gas flowmeter 341 is used for controlling the amount of the mixed gas discharge; the mixture pressure gauge 342 is used to measure the pressure of the mixture discharge amount.
And step 23, injecting the mixed gas into an underground salt cavern for storage.
The mixture has a certain pressure, and in this embodiment, the mixture is conveyed by a mixture high-pressure input pipeline. The input end of the mixed gas high-pressure input pipeline is communicated with the other end of the mixed gas output pipeline, and the output end of the mixed gas high-pressure input pipeline is communicated with the well bore inlet. The well bore outlet is in communication with the cavity of the target subterranean salt cavern.
Optionally, this step 23 may further include step 231 and step 232.
Step 231, determining the pressure of the compressed mixed gas injected into the underground salt cavern in the process of injecting the mixed gas into the underground salt cavern for storage.
The well inlet is provided with a well head valve group. Fig. 4 is a schematic diagram of a wellhead valve set according to an embodiment of the present invention. Referring to fig. 4, wellhead valve group 40 includes an intake conduit 41. The intake pipe 41 communicates with the inlet of the well bore 100 and the high pressure inlet pipe of the mixture, respectively. The intake pipe 41 is provided with an intake pressure gauge 411 and an intake flow meter 412. The pressure of the compressed mixture injected into the underground salt cavern may be determined by the intake pressure gauge 412.
And step 232, adjusting the flow of the compressed mixed gas injected into the underground salt cavern according to the pressure of the compressed mixed gas injected into the underground salt cavern.
The wellhead valve group may also include a second control module. The second control module is electrically connected with the air inlet pressure gauge and the air inlet flowmeter respectively.
The second control module is used for adjusting the flow of the compressed mixed gas injected into the underground salt cavern through the air inlet flowmeter according to the pressure of the compressed mixed gas injected into the underground salt cavern, which is measured by the air inlet pressure gauge, so as to prevent the risk of the underground reservoir caused by too high or too low air pressure.
The second control module may be a computer.
And step 24, during the storage process of the mixed gas, carrying out safety monitoring on the mixed gas stored in the underground salt cavern.
Optionally, this step 24 may include the following steps 241-243.
And 241, detecting the air pressure in the cavity of the underground salt cavern in the storage process of the mixed gas.
Referring to fig. 4, the wellhead valve stack may also include a wellhead safety valve 42, the wellhead safety valve 42 being configured to detect the gas pressure within the cavity of the underground salt cavern. The wellhead safety valve 42 is disposed at the inlet of the wellbore 100, such as in a tee pipe installed at the inlet of the wellbore 100.
Step 242, determining whether the air pressure in the cavity of the underground salt cavern is within a specified air pressure range.
The specified gas pressure range may be 6-12MPa.
Step 243, when the air pressure in the cavity of the underground salt cavern is not within the specified air pressure range, adjusting the air pressure in the cavity of the underground salt cavern.
The wellhead safety valve is also used for adjusting the air pressure in the cavity of the underground salt cavern. When the air pressure in the cavity of the underground salt cavern exceeds the appointed air pressure of the wellhead safety valve, the pressure relief opening of the wellhead safety valve is opened, and air in the cavity is discharged, so that the air pressure in the cavity of the underground salt cavern is reduced until the air pressure in the cavity of the underground salt cavern is smaller than or equal to the set air pressure, and the pressure relief opening is closed.
The long-term safety monitoring and detection of the underground helium storage during the injection and production operation and the long-term preservation and operation period of the underground helium storage are realized through the wellhead valve group, and the long-term safety monitoring and operation of the underground helium storage is ensured.
And 25, separating helium from the mixed gas stored in the underground salt cavern.
This step 25 may include the following steps 251-252.
And 251, injecting and extracting the mixed gas stored in the underground salt cavern.
And outputting the mixed gas stored in the underground salt cavern through a mixed gas high-pressure output pipeline.
Accordingly, the wellhead valve group 40 also includes an exhaust conduit 43. The exhaust conduit 43 communicates with the inlet of the well bore 100 and the high pressure output conduit of the mixture, respectively. The exhaust pipe 43 is provided with an exhaust pressure gauge 431 and an exhaust flow meter 432. The exhaust pressure gauge 431 is used for detecting the pressure of the injection and production mixed gas, and the exhaust flow meter 432 is used for adjusting the flow rate of the exhaust gas discharged by the exhaust pipeline. The pressure and flow of the mixture gas output from the helium reservoir can be controlled by an exhaust pressure gauge 431 and an exhaust flow meter 432.
Optionally, the wellhead valve group 40 further includes a gas mixture dehydration system, and the gas mixture dehydration system is used for absorbing moisture in the gas mixture, so as to extract water molecules in the gas mixture. The mixture dehydration system may be disposed at the output end of the exhaust duct 43 or the output end of the mixture high-pressure output duct. The mixed gas dehydration system can comprise a filter screen, a desiccant, a capillary tube and other similar pipelines. The present embodiment is not limited to the constitution of the gas mixture dehydration system, and a gas mixture dehydration system for absorbing moisture in a gas in the prior art may be employed.
Step 252, helium is separated from the gas mixture produced by injection.
Fig. 5 is a schematic structural diagram of a helium separation device according to an embodiment of the present invention. Referring to fig. 5, the helium separation apparatus includes a molecular sieve 51, a mixed gas input pipe 52, a purified helium gas output pipe 53, and other gas output pipes 54. The molecular sieve 51 includes a mixed gas molecular sieve core vessel 511 and a control center 512.
The mixed gas input pipeline 52 is respectively communicated with the mixed gas high-pressure output pipeline and the inlet of the mixed gas molecular sieve core container 511, and is used for realizing the input of mixed gas.
A first pressure gauge 521 and a first flow valve 522 are arranged on the mixture input line 52. The first pressure gauge 521 is used for detecting the input pressure of the mixture, and the first flow valve 522 is used for controlling the input amount of the mixture. The pressure and flow rate of the mixture gas entering the molecular sieve 51 for gas separation can be adjusted by the first pressure gauge 521 and the first flow valve 522.
The molecular sieve 51 works on the principle that helium in the injected mixed gas is separated by utilizing the molecular atomic dynamics principle, non-helium components are purified and removed through an independent molecular sieve technology and are input into an independent pipeline container, and finally helium is purified from the mixed gas and is output through a pipeline independently.
The structure of the molecular sieve in this embodiment is not limited, and the molecular sieve may be selected from molecular sieves used for separating gas in the prior art.
The purified helium output pipeline 53 is respectively communicated with a helium independent pipeline and a helium special container (or a professional helium tank truck) in the mixed gas molecular sieve core container 511, and is used for realizing the output of purified helium. A second pressure gauge 531 and a second flow valve 532 are disposed on the purified helium gas output pipe 53, the second pressure gauge 531 for detecting the purified helium gas output pressure, and the second flow valve 532 for controlling the output amount of the purified helium gas.
The other gas output pipelines 54 are respectively communicated with other gas independent pipelines and natural gas injection and production pipelines in the mixed gas molecular sieve core container 511, so that the output of other gases remaining after helium purification is realized. A third pressure gauge 541 and a third flow valve 542 are disposed on the other gas output pipe 54, the third pressure gauge 541 is used for detecting the output pressure of the other gas, and the third flow valve 542 is used for controlling the output quantity of the other gas.
The purified helium can be temporarily stored in a specific container or a professional helium tank truck for commercial sale at high price. After other gases are output, most of the gases are still natural gas components, so that the rest of the other gases can be reinjected into a natural gas injection and production pipeline of the well site, and recycling is realized.
In the embodiment, helium is mixed with natural gas to form mixed gas; injecting the mixed gas into an underground salt cavern for storage; the underground salt cavern has good tightness, the scale of the storage space is huge, the salt cavern is adopted for large-scale storage of national strategic substances, the underground salt cavern has good tightness and stability, the safety is high, and the underground salt cavern can be permanently stored; helium is mixed with natural gas, so that the diffusion of helium molecules and the leakage of rock stratum can be effectively prevented, and the escape of helium molecules is prevented to the maximum extent; the underground salt cavern large-scale helium storage method can effectively realize permanent storage of helium in the underground salt cavern and prevent escape of helium molecules in a minimum amount, and has high economic value and strong practicability.
In addition, natural gas can be stored together with helium as an important strategic substance, and the underground salt cavern large-scale helium storage method additionally realizes long-term storage of natural gas while helium is stored.
By the method for storing helium in the underground salt cavern on a large scale, the low price purchase and high price sale of helium are properly carried out under the action of the domestic and foreign economic environment and the market environment, so that the long-term safe operation of a helium storage warehouse is maintained, and self-negative profit and loss or profit and harvest are realized.
The above-described embodiments are merely exemplary, and it should be understood by those skilled in the art that the methods and systems described herein are not limited to the examples described in the detailed description. Other embodiments will occur to those skilled in the art from consideration of the specification of the invention, which is also within the scope of the invention as claimed.
Claims (8)
1. A method for large-scale helium storage in an underground salt cavern, which is characterized by comprising the following steps:
mixing helium with natural gas to form a mixed gas;
and injecting the mixed gas into an underground salt cavern for storage.
2. The method of mass helium storage in a salt cavern of claim 1, wherein the volume ratio of helium to natural gas in the gas mixture is 5%.
3. The method of mass helium storage in an underground salt cavern of claim 1, wherein said mixing helium with natural gas comprises:
delivering the helium and the natural gas to a gas mixing vessel, respectively;
determining the concentration of helium and the concentration of other gases than helium in the gas mixing vessel;
and respectively adjusting the flow rates of helium and natural gas which are delivered to the gas mixing container according to the determined concentration of helium in the gas mixing container and the determined concentration of other gases except helium.
4. A method of mass helium storage in an underground salt cavern as set forth in claim 3, further comprising:
a gas pressure disturbance is generated in the gas mixing vessel to substantially fuse the gas in the gas mixing vessel.
5. The method of mass helium storage in an underground salt cavern of claim 1, further comprising:
determining the pressure of the gas mixture injected into the underground salt cavern;
and adjusting the flow rate of the gas mixture injected into the underground salt cavern according to the pressure of the compressed gas mixture injected into the underground salt cavern.
6. The method of mass helium storage in an underground salt cavern of claim 1, further comprising:
detecting the air pressure in the cavity of the underground salt cavern in the storage process of the mixed gas;
determining whether the air pressure in the cavity of the underground salt cavern is within a specified air pressure range;
and when the air pressure in the cavity of the underground salt cavern is not in the specified air pressure range, adjusting the air pressure in the cavity of the underground salt cavern.
7. The method of mass helium storage in an underground salt cavern of claim 1, further comprising, after injecting the mixture into the underground salt cavern for storage:
injecting and extracting the mixed gas stored in the underground salt cavern;
helium is separated from the gas mixture produced by injection.
8. The method of mass helium storage in an underground salt cavern of claim 1, comprising, prior to said mixing helium with natural gas:
converting the prepared liquid helium into the helium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202310899973.2A CN116877198A (en) | 2023-07-20 | 2023-07-20 | Large-scale helium storage method for underground salt cavern |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310899973.2A CN116877198A (en) | 2023-07-20 | 2023-07-20 | Large-scale helium storage method for underground salt cavern |
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| CN116877198A true CN116877198A (en) | 2023-10-13 |
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| CN202310899973.2A Pending CN116877198A (en) | 2023-07-20 | 2023-07-20 | Large-scale helium storage method for underground salt cavern |
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