Gas injection and brine discharge system for salt cavern helium storage reservoir

Abstract

The salt cavern helium storage reservoir gas injection brine discharging system is good in brine discharging effect. The salt cavern helium storage reservoir gas injection and brine discharge system comprises a gas injection pipe line, a gas injection well, a salt cavern cavity, a brine discharge well, a brine discharge pipe line, an external brine conveying pipeline and a flushing line which can be sequentially communicated, and the gas injection pipe line is communicated with the gas injection well through opening of a wellhead gas injection gate valve; a wellhead brine discharging gate valve, a first filter and a brine discharging gate valve of the brine discharging pipeline are sequentially arranged, the brine discharging gate valve can be communicated with a sediment pipeline or a direct conveying pipeline, the direct conveying pipeline is provided with a direct conveying gate valve, the sediment pipeline and the direct conveying pipeline can be communicated with an external brine conveying pipeline, and the flushing pipeline is communicated with the brine discharging pipeline by opening a clear water gate valve. And the flushing line is communicated between the wellhead brine discharging gate valve and the brine discharging gate valve. According to the gas injection and brine discharge system for the salt cavern helium storage reservoir, helium loss can be avoided, the risk of crystallization blockage of a pipe column is reduced, the brine discharge flow is increased, and a large amount of gas injection and brine discharge time is saved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of helium underground storage, and particularly relates to a gas injection and brine discharge system for a salt cavern helium storage. BACKGROUND

[0002] Helium is widely used in liquid fuel rockets, manned deep diving, fourth-generation nuclear reactors, semiconductor manufacturing, quantum computers, nuclear magnetic resonance, modern precision analytical instruments, and other national defense industries and high-tech fields. It is called "golden gas" and is an extremely important, extremely scarce and non-renewable strategic resource.

[0003] The global proven and developed helium resources are mainly in the form of trace components associated with oil and gas reservoirs or non-hydrocarbon gas reservoirs. According to data from the United States Geological Survey (USGS), as of the end of 2022, the total global helium resources were about 484x10 8 m 3 , mainly distributed in the United States, Qatar, Algeria and Russia, accounting for 87% of the global resources. China is relatively short of helium resources, accounting for only 2% of the global resources. However, China is a major consumer of helium, accounting for 11% of global consumption and about 1 / 3 of the Asia-Pacific region in 2022, and the consumption is growing.

[0004] China is extremely short of helium resources, highly dependent on imports and has a single source. To ensure China's helium security, it is an urgent task to build an underground helium storage facility that is technically feasible, safe and reliable, and relatively economical. China has abundant salt resources and a wide distribution, providing a natural advantage for building salt cavern storage.

[0005] When a salt cavern is used to store helium, the cavity is filled with a large amount of brine after the salt cavern is completed, and the brine needs to be discharged by gas injection to make it a suitable storage space, which requires "gas injection and brine discharge". During normal gas injection and production in a salt cavern, "gas injection and brine discharge" is also required. Therefore, "gas injection and brine discharge" is one of the core technologies for salt cavern helium storage, with high technical requirements and great safety risks. The existing "gas injection and brine discharge" process is relatively mature and is applied to the storage of natural gas. Unlike natural gas, helium is expensive, and the traditional gas injection and brine discharge method applied to the storage of helium not only has a complex process, but also causes a large waste of helium resources and economic losses, making the cost of salt cavern helium storage high and the economic efficiency poor. How to choose the appropriate gas injection and brine discharge process for salt cavern helium storage is the key to realizing the practical application of salt cavern helium storage. SUMMARY

[0006] In view of the deficiencies of the prior art, the application provides a gas injection and brine discharge system for a salt cavern helium storage.

[0007] The helium injection and brine discharge system of the salt cave helium storage library comprises sequentially connectable injection pipeline, injection well, salt cave cavity, brine discharge well, brine discharge pipeline, brine output pipeline and flushing pipeline, the injection pipeline is provided with wellhead injection gate valve, the injection pipeline is communicated with the injection well through the opening of the wellhead injection gate valve, the brine discharge pipeline has wellhead brine discharge gate valve, first filter, brine discharge gate valve, sediment pipeline and direct delivery pipeline, the wellhead brine discharge gate valve, first filter and brine discharge gate valve are sequentially arranged, the brine discharge gate valve is connectable with the sediment pipeline or the direct delivery pipeline, the direct delivery pipeline has direct delivery gate valve, the sediment pipeline and the direct delivery pipeline are connectable with the brine output pipeline, the sediment pipeline comprises sequentially connectable sediment direct delivery valve, sediment tank, output pump inlet valve, second filter and brine pump, the flushing pipeline comprises water gate valve, flushing pump and water storage tank, the flushing pipeline is communicated with the brine discharge pipeline through the opening of the water gate valve, and the flushing pipeline is communicated between the wellhead brine discharge gate valve and the brine discharge gate valve.

[0008] When the brine is discharged in the early stage and the late stage, the wellhead brine discharge gate valve, the first filter, the brine discharge gate valve, the sediment direct delivery valve, the sediment tank, the output pump inlet valve, the second filter, the brine pump and the brine output pipeline are sequentially connected.

[0009] When the brine is normally discharged between the early stage and the late stage, the wellhead brine discharge gate valve, the first filter, the brine discharge gate valve, the direct delivery pipeline and the brine output pipeline are sequentially connected.

[0010] Preferably, the sediment pipeline further comprises check valve, output pump gate valve and brine pump pressure gauge sequentially after the brine pump.

[0011] When the brine is discharged in the early stage and the late stage, the wellhead brine discharge gate valve, the first filter, the brine discharge gate valve, the sediment direct delivery valve, the sediment tank, the output pump inlet valve, the second filter, the brine pump, the check valve and the brine output pipeline are sequentially connected.

[0012] The sediment pipeline further comprises water storage pipeline connected with external water storage tank, the water storage pipeline is provided with external gate valve, and the water storage pipeline is connected between the output pump inlet valve and the filter.

[0013] The sediment tank is further connected with tap water pipeline.

[0014] Preferably, the brine output pipeline comprises first pipeline, second pipeline and output flow meter, the first pipeline comprises first gate valve, electric regulating valve and output total gate valve sequentially, and the second pipeline is provided with second gate valve.

[0015] When the early and late stage of brine discharge: make the wellhead brine discharge gate valve, the first filter, the brine discharge gate valve, the sediment direct valve, the sediment tank, the export pump inlet valve, the second filter, the brine pump, the first gate valve, the electric regulating valve, the export total gate valve, the export flowmeter in turn communication;

[0016] When the normal brine discharge between the early and late stage of brine discharge: make the wellhead brine discharge gate valve, the first filter, the brine discharge gate valve, the direct discharge pipeline, the first gate valve, the electric regulating valve, the export total gate valve, the export flowmeter in turn communication.

[0017] Preferably, the brine discharge pipeline further comprises a first emergency cut-off valve, a pre-filter gate valve, a post-filter gate valve and a brine discharge flowmeter,

[0018] When the early and late stage of brine discharge: make the wellhead brine discharge gate valve, the first emergency cut-off valve, the pre-filter gate valve, the first filter, the post-filter gate valve, the brine discharge flowmeter, the brine discharge gate valve, the sediment direct valve, the sediment tank, the export pump inlet valve, the second filter, the brine pump, the brine discharge pipeline in turn communication;

[0019] When the normal brine discharge between the early and late stage of brine discharge: make the wellhead brine discharge gate valve, the first emergency cut-off valve, the pre-filter gate valve, the first filter, the post-filter gate valve, the brine discharge flowmeter, the brine discharge gate valve, the direct discharge pipeline, the brine discharge pipeline in turn communication.

[0020] Preferably, the brine discharge pipeline further comprises a center pipeline, one end of the center pipeline is communicated with the brine well, the other end is communicated with the pipeline between the first emergency cut-off valve and the pre-filter gate valve, the center pipeline comprises a center pipe gate valve and a second emergency cut-off valve, the center pipe gate valve is located near the one end of the brine well;

[0021] The flushing pipeline further comprises a flushing pump pressure gauge, a clean water flowmeter, a pre-pump gate valve, a clean water end check valve, a post-pump gate valve and a clean water filter, the flushing pipeline further comprises a clean water standby pipeline, one end of the clean water standby pipeline is communicated with the water storage tank, the other end is communicated with the pipeline between the clean water end check valve and the flushing pump;

[0022] During the gas injection brine discharge process, the backwashing operation is carried out periodically, when the backwashing operation, the clean water in the flushing pipeline passes through the water storage tank, the clean water filter, the pre-pump gate valve, the flushing pump, the clean water end check valve, the post-pump gate valve, the clean water flowmeter, the clean water gate valve, the second emergency cut-off valve, the center pipe gate valve in turn, the center pipe gate valve is communicated with the flushing pipe, the flushing pipe is communicated with the bottom of the cavity sediment of the salt cavity through the brine well.

[0023] Preferably, the brine discharge pipeline further comprises a pre-filter gate valve, a post-filter gate valve and a brine discharge flowmeter,

[0024] The flushing circuit further comprises a flushing pump pressure gauge, a clean water flow meter, a pre-pump gate valve, a clean water end check valve, a post-pump gate valve and a clean water filter,

[0025] When the ground pipeline system needs to be flushed, the clean water sequentially passes through the water storage tank, the clean water filter, the pre-pump gate valve, the flushing pump, the clean water end check valve, the post-pump gate valve, the clean water flow meter, the clean water gate valve, the pre-filter gate valve, the first filter, the post-filter gate valve, the brine discharge flow meter, the brine discharge gate valve, the direct delivery pipeline and the brine delivery pipeline.

[0026] Preferably, the gas injection pipeline circuit comprises, in sequence, an air compressor pipeline, a gas injection gate valve, a first flow meter, a gate valve, a reducer, a pneumatic safety valve and a wellhead gas injection gate valve, and the air compressor pipeline comprises at least two groups, each group of air compressor pipeline comprising, in sequence, an air compressor unit, a second flow meter and a machine gate valve.

[0027] Preferably, the brine discharge pipeline circuit further comprises a first emergency shut-off valve and a brine discharge flow meter,

[0028] The brine discharge pipeline circuit further comprises a brine discharge standby pipeline, the brine discharge standby pipeline having a standby gate valve, and the two ends of the brine discharge standby pipeline are connected to the pipelines at the two ends of the filter of the brine discharge pipeline circuit.

[0029] When a large amount of sediment is detected to return from the wellhead of the brine discharge well: the wellhead brine discharge gate valve, the first emergency shut-off valve, the standby gate valve, the brine discharge flow meter, the brine discharge gate valve, the sediment pipeline and the brine delivery pipeline are sequentially communicated.

[0030] Preferably, the gas injection pipeline circuit is provided with a leakage prevention monitoring device at the joint of the gas injection pipeline, the leakage prevention monitoring device comprises an upper fixed sleeve and a lower fixed sleeve capable of forming a sealed chamber, a T-shaped ventilation pipe is fixedly connected to the upper end of the upper fixed sleeve, ventilation holes are formed in the left and right sides of the ventilation pipe, one-way ventilation closing plugs are slidably connected in the ventilation holes, the ventilation pipe communicates with the sealed chamber, a rotating fan is arranged on the lower side of the ventilation pipe, a push rod is fixedly connected to the left end of the rotating fan, an alarm assembly is arranged on the right side of the upper end of the upper fixed sleeve, a T-shaped push rod is fixedly connected to the left end of the alarm assembly, a sliding groove is formed in the left side of the push rod, and the lower side of the push rod is located in the sliding groove.

[0031] Preferably, a trigger assembly is arranged on the front side of the upper end of the upper fixed sleeve, a T-shaped reciprocating rod is fixedly connected to the rear end of the trigger assembly, a movable slot is formed in the rear side of the reciprocating rod, the upper side of the push rod is located in the movable slot, support plates are fixedly connected to the left and right sides of the ventilation pipe, locking assemblies are arranged on the opposite ends of the two support plates, and the trigger assembly can trigger the locking assemblies on the two sides to block the closing plugs of the ventilation pipe.

[0032] The salt cavern helium storage injection and brine discharge system provided by the application has the following beneficial effects:

[0033] Helium loss can be avoided, the risk of column crystallization blockage is reduced, the halogen discharge flow is increased, and a large amount of gas injection and halogen discharge time is saved. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above and other objects, features and advantages of the present application will become more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: Like reference numerals in the drawings designate identical parts throughout the various figures, and the drawings are not intended to be drawn to scale unless specifically noted, the emphasis being instead on illustrating the principal subject matter of the present application.

[0035] Figure 1 It is a structure schematic diagram of the gas injection and halogen discharge system of the salt cave helium storage.

[0036] Figure 2 It is a structure schematic diagram of the gas injection pipeline of the present application.

[0037] Figure 3 It is a halogen brine flow direction schematic diagram of the gas injection and halogen discharge system of the present application in the early and late halogen discharge stages.

[0038] Figure 4 It is a halogen brine flow direction schematic diagram of the gas injection and halogen discharge system of the present application in the normal halogen discharge stage.

[0039] Figure 5 It is a clean water flow direction schematic diagram of the gas injection and halogen discharge system of the present application in the backwashing operation.

[0040] Figure 6 It is a clean water flow direction schematic diagram of the gas injection and halogen discharge system of the present application in the ground flushing.

[0041] Figure 7 It is a halogen brine flow direction schematic diagram of the gas injection and halogen discharge system of the present application in the detection of a large amount of sediment returned from the wellhead.

[0042] Figure 8 It is a structure schematic diagram of the leakage prevention monitoring device provided by the present application.

[0043] Figure 9 It is a partial cutaway schematic diagram of the upper solid sleeve in the present application.

[0044] Figure 10 It is a partial cutaway schematic diagram of the alarm in the present application.

[0045] Figure 11 It is a schematic diagram of the lower solid sleeve in the present application.

[0046] Figure 12 It is a schematic diagram of the rotating fan in the present application.

[0047] Figure 13 It is a schematic diagram of the driving rack in the present application.

[0048] Figure 14is a schematic view of the fixing frame in the present application. DETAILED DESCRIPTION

[0049] For the purpose of facilitating the understanding of the present application, a more comprehensive description will be made below with reference to the relevant drawings.

[0050] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element and integrated as a whole, or a middle element can exist at the same time. The terms "mount", "one end", "the other end" and the like used herein are only for illustrative purposes.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this technology belongs. The terms used in the specification herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0052] Reference Figures 1-14 , the embodiment of the present application provides a salt cave helium storage injection gas halogen discharge system, including sequentially connected injection gas pipeline 1, injection well 2, salt cave 3, halogen discharge well 4, halogen discharge pipeline 5, halogen discharge pipeline 6 and flushing line 7, injection gas pipeline 1 is provided with wellhead injection gas gate valve 11, injection gas pipeline 1 is communicated with injection well 2 through the opening of wellhead injection gas gate valve 11, halogen discharge pipeline 5 has wellhead halogen discharge gate valve 511, first filter 522, halogen discharge gate valve 54, sediment pipeline, direct delivery pipeline, wellhead halogen discharge gate valve 511, first filter 522, halogen discharge gate valve 54 are sequentially arranged, halogen discharge gate valve 54 can be communicated with sediment pipeline or direct delivery pipeline, direct delivery pipeline has direct delivery gate valve 55, sediment pipeline and direct delivery pipeline can be communicated with halogen discharge pipeline 6, sediment pipeline includes sediment direct valve 552, sediment tank 50, halogen discharge pump inlet valve 553, second filter 555, halogen discharge pump 556 which can be sequentially communicated; flushing line 7 includes water gate valve 79, flushing pump 74 and water storage tank 71, flushing line 7 is communicated with halogen discharge pipeline 5 through the opening of water gate valve 79, flushing line 7 is communicated between wellhead halogen discharge gate valve 511 and halogen discharge gate valve 54.

[0053] When the early and late stage of brine discharge: the wellhead brine discharge gate valve 511, the first filter 522, the brine discharge gate valve 54, the sediment straight-through valve 552, the sediment tank 50, the export pump inlet valve 553, the second filter 555, the brine pump 556, and the brine export pipeline 6 are sequentially connected; the brine discharged from the brine well 4 passes through the brine discharge gate valve 54, the first filter 522, the brine discharge gate valve 54, the sediment straight-through valve 552, the sediment tank 50, the export pump inlet valve 553, the second filter 555, the brine pump 556, and the brine export pipeline 6 in sequence. During the early stage of brine discharge, gas may enter the brine discharge pipe, and during the late stage of brine discharge, before the end of gas injection, the gas will enter the brine discharge pipe due to the close proximity of the gas-liquid interface to the bottom of the brine well 4, so it is necessary to first enter the sediment tank 50 for export, at which time the direct export gate valve 55 of the direct export pipeline is closed.

[0054] When the normal brine discharge between the early and late stages of brine discharge: the wellhead brine discharge gate valve 511, the first filter 522, the brine discharge gate valve 54, the direct export pipeline, and the brine export pipeline 6 are sequentially connected. At this time, the direct export gate valve 55 is opened, the sediment straight-through valve 552 is closed, and the brine discharged from the brine well 4 does not pass through the sediment pipeline but passes through the direct export pipeline and sequentially passes through the wellhead brine discharge gate valve 511, the first filter 522, the brine discharge gate valve 54, the direct export gate valve 55, and the brine export pipeline 6.

[0055] The brine injection and discharge system provided by the embodiment can ensure constant pressure operation of the salt cavity during the injection and gas production operation stage by injecting brine through newly drilled wells and producing gas through original wells, which is beneficial to the stability of the helium storage cavity and can also extract all the gas. The brine injection and discharge system avoids the damage of the pipe string and the loss of helium gas under pressure caused by the complex injection and production pipe string of a single well in the traditional brine injection and discharge process, and can better avoid the loss of helium gas under pressure. The brine injection and discharge system reduces the risk of crystallization blockage of the pipe string, increases the brine discharge flow, and saves a lot of brine injection and discharge time.

[0056] Reference Figures 1-3In the preferred embodiment, the gas injection pipeline 1 comprises, in sequence, an air compressor pipeline, a gas injection gate valve 16, a first flow meter 15, a gate valve 14, a reducer 13, a pneumatic safety valve 12, and a wellhead gas injection gate valve 11. The air compressor pipeline comprises at least two groups, each group comprising, in sequence, an air compressor unit 19, a second flow meter 18, and a machine gate valve 17. After the air compressor unit 19 is started, helium gas enters the gas injection well 2 through the second flow meter 18, the machine gate valve 17, the gas injection gate valve 16, the first flow meter 15, the gate valve, the reducer 13, the pneumatic safety valve 12, and the wellhead gas injection gate valve 11, and then enters the salt cavern cavity 3. After the gas enters the salt cavern cavity 3, the brine is discharged through the brine discharge well 4. The brine discharge system of the salt cavern helium storage provided in the embodiment can better avoid the risks of blockage and crystallization, and thus can be operated at a constant pressure, which is conducive to the stability of the helium storage cavity and avoids helium leakage. Moreover, the system can have a good brine discharge flow rate under no pressure, and is very economical and applicable, and can be applied to actual production and use.

[0057] Reference Figure 1 , Figures 3-4 In the preferred embodiment, the brine discharge pipeline 5 further comprises a first emergency shut-off valve 513, a pre-filter gate valve 521, a post-filter gate valve 523, and a brine discharge flow meter 53. The sludge pipeline comprises, in sequence after the brine conveying pump 556, a check valve 557, an external conveying pump gate valve 558, and a brine conveying pump pressure gauge. The external brine conveying pipeline 6 comprises a first pipeline, a second pipeline, and an external conveying flow meter 65. The external conveying flow meter 65 is used to measure the discharge brine flow rate. The first pipeline comprises, in sequence, a first gate valve 61, an electric regulating valve 62, and an external conveying total gate valve 63. The second pipeline has a second gate valve.

[0058] Reference Figure 3 When the brine is discharged in the early and late stages, the direct conveying gate valve 55 is closed, and the wellhead brine discharge gate valve 511, the first emergency shut-off valve 513, the pre-filter gate valve 521, the first filter 522, the post-filter gate valve 523, the brine discharge flow meter 53, the brine discharge gate valve 54, the sludge direct conveying valve 552, the sludge tank 50, the external conveying pump inlet valve 553, the second filter 555, the brine conveying pump 556, the check valve 557, the external conveying pump gate valve 558, the first gate valve 61, the electric regulating valve 62, the external conveying total gate valve 63, and the external conveying flow meter 65 are sequentially connected.

[0059] Reference Figure 4 When the brine is normally discharged between the early and late stages, the wellhead brine discharge gate valve 511, the first emergency shut-off valve 513, the pre-filter gate valve 521, the first filter 522, the post-filter gate valve 523, the brine discharge flow meter 53, the brine discharge gate valve 54, the direct conveying gate valve 55, the first gate valve 61, the electric regulating valve 62, the external conveying total gate valve 63, and the external conveying flow meter 65 are sequentially connected.

[0060] Reference Figure 3In the preferred embodiment, the sludge pipe also comprises a water storage pipe connected to the external water storage tank, the water storage pipe is provided with an external gate valve 554, the water storage pipe is connected between the external delivery pump inlet valve 553 and the filter, when the normal injection of brine and exhaust, the external gate valve 554 is closed, the water storage pipe is closed, when the sludge pipe needs to be cleaned, the external delivery pump inlet valve 553 can be closed, the external gate valve 554 is opened, so that the clean water can pass through the second filter 555, the brine pump 556, the check valve 557, the first gate valve 61, the electric regulating valve 62, the external delivery total gate valve 63, and the external delivery flow meter 65 in turn, to clean the sludge pipe and the external brine pipe 6. The sludge tank 50 is also connected with a tap water pipe 551, which can supply water to the sludge tank 50.

[0061] Reference Figure 3 and Figure 5 In the preferred embodiment, the brine discharge pipeline 5 also comprises a central pipeline, one end of the central pipeline is communicated with the brine well 4, and the other end is communicated with the pipeline between the first emergency cut-off valve 513 and the pre-filter gate valve 521, the central pipeline comprises a central pipe gate valve 514 and a second emergency cut-off valve 515, and the central pipe gate valve 514 is located at the end close to the brine well 4; the flushing pipeline 7 also comprises a flushing pump 74 pressure gauge, a clean water flow meter 77, a pre-pump gate valve 73, a clean water end check valve 75, a post-pump gate valve 76, and a clean water filter 72, and the flushing pipeline 7 also comprises a clean water standby pipeline, one end of the clean water standby pipeline is communicated with the water storage tank, and the other end is communicated with the pipeline between the clean water end check valve 75 and the flushing pump 74.

[0062] During the gas injection and brine discharge process, backwashing operation is carried out regularly, during the backwashing operation, the clean water in the flushing pipeline 7 passes through the water storage tank 71, the clean water filter 72, the pre-pump gate valve 73, the flushing pump 74, the clean water end check valve 75, the post-pump gate valve 76, the clean water flow meter 77, the clean water gate valve 79, the second emergency cut-off valve 515, and the central pipe gate valve 514 in turn, the central pipe gate valve 514 is communicated with the flushing pipe, and the flushing pipe is communicated with the bottom of the cavity sludge of the cavity of the salt cavern 3 through the brine well 4. The brine in the salt cavern is saturated brine, during the extraction of the brine, there are pressure drop and temperature drop factors, which cause the recrystallization of the salt in the brine discharge pipe, therefore, it is necessary to flush the brine discharge pipe column in the cavity with fresh water or brine water regularly, so as to better avoid the blockage and reduce the loss of helium.

[0063] Reference Figure 3 and Figure 6In the preferred embodiment, when the ground pipeline system needs to be flushed, the clean water passes through the water storage tank 71, the clean water filter 72, the pre-pump gate valve 73, the flushing pump 74, the clean water end check valve 75, the post-pump gate valve 76, the clean water flow meter 77, the clean water gate valve 79, the pre-filter gate valve 521, the first filter 522, the post-filter gate valve 523, the brine discharge flow meter 53, the brine discharge gate valve 54, the direct delivery gate valve 55, the first gate valve 61, the electric regulating valve 62, the external delivery total gate valve 63, and the external delivery flow meter 65 in sequence. The crystallization of the ground pipeline system can be prevented, and the brine delivery can be ensured smooth.

[0064] Referring to Figure 3 and Figure 7 In the preferred embodiment, the brine discharge pipeline 5 further comprises a brine discharge standby pipeline, which has a standby gate valve 524 and is connected to the pipelines at both ends of the filter of the brine discharge pipeline 5. When a large amount of sediment is detected to return from the wellhead of the brine discharge well 4, the pre-filter gate valve 521 is closed, and the standby gate valve 524 is opened: the wellhead brine discharge gate valve 511, the first emergency shut-off valve 513, the standby gate valve 524, the brine discharge flow meter 53, the brine discharge gate valve 54, the sediment direct delivery valve 552, the sediment tank 50, the external delivery pump inlet valve 553, the second filter 555, the brine delivery pump 556, the check valve 557, the external delivery pump gate valve 558, the first gate valve 61, the electric regulating valve 62, the external delivery total gate valve 63, and the external delivery flow meter 65 are sequentially connected.

[0065] Referring to Figure 3 In the preferred embodiment, the brine discharge pressure gauge 512 is arranged between the wellhead brine discharge gate valve 511 and the first emergency shut-off valve 513 of the brine discharge pipeline 5, and the brine delivery pump pressure gauge 559 is arranged between the external delivery pump gate valve 558 of the sediment pipeline and the first gate valve 61 of the external brine pipeline 6. Whether the pressure of the gas injection and brine discharge process is abnormal can be monitored. The external brine pipeline 6 further has an external standby pipeline, which is connected at one end to the connection between the external brine pipeline 6 and the brine discharge pipeline 5 and at the other end to between the external delivery total gate valve 63 and the external delivery flow meter 65, and has an external standby gate valve 64.

[0066] Referring to Figure 5 In the preferred embodiment, the flushing pipeline 7 further has the flushing pump pressure gauge 78 and the tap water pipeline 701.

[0067] In the preferred embodiment, the depth of the gas-liquid interface is calculated by passing the brine density, the wellhead pressure of the brine discharge well, the gas injection pressure, and the gas density multiple times during the gas injection and brine discharge liquid level detection test; then the optimized correction parameters are obtained according to the comparison between the calculated depth of the gas-liquid interface and the real-time monitoring of the position of the gas-liquid interface by the optical fiber, and the calculation method of the depth of the gas-liquid interface is constructed together with the brine density, the wellhead pressure of the brine discharge well, the gas injection pressure, and the gas density.

[0068] The gas injection brine discharge liquid surface detection test includes the following steps:

[0069] The brine discharge gate valve of the brine discharge well is closed, the gas injection valve is opened, the compressor is opened to press helium into the wellbore of the gas injection well, the gas-liquid interface position is monitored in real time through the optical fiber, the depth of the wellbore stage gas-liquid interface is obtained according to the brine density, the wellhead pressure of the brine discharge well, the gas injection pressure and the gas density, the depth of the wellbore stage gas-liquid interface is compared with the real-time monitoring position of the optical fiber, and the correction parameter of the wellbore stage is optimized;

[0070] When the gas-liquid interface position enters the cavity section, the wellhead of the brine discharge well is opened, the air compressor continuously and constantly pressurizes helium, the brine discharge port of the brine discharge well continuously discharges brine, the depth of the cavity stage gas-liquid interface is obtained according to the brine density, the wellhead pressure of the brine discharge well, the gas injection pressure, the gas density and the optimized correction parameter of the wellbore stage, and the depth of the cavity stage gas-liquid interface is compared with the real-time monitoring position of the optical fiber, and the correction parameter is continuously optimized;

[0071] When the gas-liquid interface position enters the stage below the sediment, the helium is continuously and stably pressurized, the brine discharge port of the brine discharge well continuously discharges brine, and the depth of the gas-liquid interface in the stage below the sediment is obtained according to the brine density, the wellhead pressure of the brine discharge well, the gas injection pressure, the gas density and the optimized correction parameter of the cavity section;

[0072] When the liquid interface is 1-3m away from the brine discharge port of the brine discharge port, the brine discharge speed is slowed down, and the brine discharge port is immediately closed when the gas return bubble is observed. Stop gas injection, close the brine discharge gate valve and the gas injection valve.

[0073] Reference Figure 2 In the preferred embodiment, the gas injection pipeline is provided with a leakage monitoring device f at the joint of the gas injection pipeline 1a.

[0074] Reference Figures 8-14 The leakage monitoring device f includes an upper fixed sleeve 2a and a lower fixed sleeve 3a, the upper fixed sleeve 2a and the lower fixed sleeve 3a can form a cylindrical shape, the front ends of the lower fixed sleeve 3a are respectively provided with fixed assemblies, the front side of the upper fixed sleeve 2a is slidably connected with two lock latches 4a which can cooperate with the corresponding side fixed assemblies, the fixed assemblies and the lock latches 4a can be used to fix the upper fixed sleeve 2a and the lower fixed sleeve 3a to form a sealed chamber, the joint of the gas injection pipeline 1a is located in the sealed chamber, and the leakage condition can be monitored conveniently. The upper end of the upper fixed sleeve 2a is fixedly connected with a T-shaped ventilation pipe 5a, ventilation holes are respectively formed in the left and right sides of the ventilation pipe 5a, one-way ventilation closing plugs 11a are slidably connected in the ventilation holes, a rotating fan 6a is arranged on the lower side of the ventilation pipe 5a, and a lever 7a is fixedly connected with the rotating fan 6a in an eccentric manner.

[0075] Reference Figures 8-10The upper fixed sleeve 2a upper end right side is provided with an alarm assembly, the alarm assembly left end is fixedly connected with a T-shaped push rod 8a, the push rod 8a left side is provided with a sliding slot, and the push rod 7a lower side is located in the sliding slot. The alarm assembly comprises a movable cylinder 20a, the movable cylinder 20a inner right side is fixedly connected with a positive block 21a, the movable cylinder 20a inner left side is slidably connected with a negative block 22a, the negative block 22a left end is fixedly connected with the push rod 8a right end, and the negative block 22a right end is in contact with the positive block 21a. The upper fixed sleeve 2a upper end right side is fixedly connected with an alarm 23a, and the alarm 23a is in communication with the positive block 21a and the negative block 22a through wires.

[0076] When the gas injection pipeline leaks, a large amount of gas rushes out from the gas injection pipeline into the chamber formed by the fixed sleeve, and the gas flow leaks to the outside after the closure plug 11a is pushed open. At this time, the rotating fan 6a is driven to rotate by the gas flow, and the negative block 22a is continuously moved left and right by the push rod 8a and the push rod 7a. When the negative block 22a moves to the right end limit position, the negative block 22a is in contact with the positive block 21a. At this time, the alarm 23a is powered on to alarm. When the leakage is larger, the wind speed in the ventilation pipe 5a is larger, the rotating speed of the rotating fan 6a is faster, and the alarm interval of the alarm 23a is smaller. Conversely, the alarm interval is larger, which can be used to judge the speed of leakage. The leakage of helium can be found in time during the gas injection and halogen removal process, and the loss of helium can be avoided. The anti-leakage monitoring device can also be used in pipeline transportation during helium extraction.

[0077] Reference Figures 8-14 In the preferred embodiment, the upper fixed sleeve 2a upper end front side is provided with a trigger assembly, the trigger assembly rear end is fixedly connected with a T-shaped reciprocating rod 9a, the reciprocating rod 9a rear side is provided with a movable slot, and the push rod 7a upper side is located in the movable slot. The ventilation pipe 5a left and right sides are respectively fixedly connected with a support plate 12a, and the two support plates 12a opposite ends are respectively provided with a locking assembly. The trigger assembly can trigger the locking assemblies on both sides to block the closure plugs 11a on both sides to block the ventilation pipe 5a.

[0078] Reference Figures 8-14The trigger assembly comprises a driving plate 24a, the rear end of the driving plate 24a is fixedly connected with the front end of the reciprocating rod 9a, the lower end of the driving plate 24a is fixedly connected with driving frames 25a on the left and right sides respectively, driving racks 26a capable of moving up and down are arranged on the driving frames 25a, link plates 27a are fixedly connected on the left and right sides of the front end of the ventilation pipe 5a respectively, driving gears 28a capable of meshing with the corresponding side driving racks 26a are rotatably connected to the lower end of the link plates 27a, a lifting frame 29a is arranged above the driving plate 24a, lead screws 30a coaxial with the corresponding side driving gears 28a are fixedly connected to the left and right sides of the lower end of the lifting frame 29a respectively, the lead screws 30a are threadedly connected with the corresponding side driving gears 28a, two sleeve sleeves 31a opposite to each other are fixedly connected to the upper end of the upper fixed sleeve 2a, the sleeve sleeves 31a are sleeved with the corresponding side lead screws 30a, a moving groove 32a is formed in the middle of the lifting frame 29a, and a trigger rod 33a is slidably connected in the moving groove 32a.

[0079] The rotation of the rotating fan 6a drives the driving plate 24a to move forward and backward through the driving of the pulling rod 7a and the reciprocating rod 9a, in this process, the driving rack 26a moves forward, driving the gear to rotate, and when moving backward, the driving rack 26a does not contact the driving gear 28a, so that the rotation of the rotating fan 6a for one circle only drives the driving gear 28a to rotate by a certain angle, and the rotation of the driving gear 28a drives the lead screw 30a to rise, and the lead screw 30a drives the trigger rod 33a to rise through the lifting frame 29a, until the trigger locking assembly is triggered, the threads of the two lead screws 30a in the trigger assembly are opposite, so that the lifting frame 29a can be driven to rise synchronously on the left and right sides, and the inclination can be avoided.

[0080] The left and right sides of the front end of the ventilation pipe 5a are fixedly connected with fixed plates 34a, one side of the fixed plate 34a is provided with a one-way groove 35a, one side of the driving rack 26a is connected with a driving pin 36a through a compression spring two, the driving pin 36a is located in the one-way groove 35a on the corresponding side, and the driving frame 25a is slidably connected with the corresponding side fixed plate 34a.

[0081] The driving pin 36a and the compression spring two drive the driving rack 26a to move on the fixed plate 34a, that is, when the driving rack 26a moves forward, the driving rack 26a is located on the upper side of the driving frame 25a, and the driving rack 26a can drive the driving gear 28a to rotate, when the driving rack 26a moves backward, the driving rack 26a does not contact the driving gear 28a, so that the driving gear 28a cannot be driven to rotate, and after several times, the lifting frame 29a can be lifted to the appropriate position, and the trigger is completed.

[0082] The blocking assembly comprises a blocking frame 38a which is in sliding connection with the support plate 12a, the support plate 12a is fixedly connected with a support rod 39a, the support rod 39a is sleeved with a force storage spring 40a between the support rod 39a and the blocking frame 38a, the upper end surface of the blocking frame 38a is an inclined surface from left top to right bottom, the closure plug 11a can be in contact with the inclined surface of the blocking frame 38a, and the lower side of the blocking frame 38a is fixedly connected with a U-shaped limiting rod 41a, and the trigger rod 33a is located in the limiting rod 41a on the corresponding side.

[0083] The trigger rod 33a is located in the limiting rod 41a on the corresponding side, the support plate 12a is provided with an inclined groove 42a, the trigger rod 33a is located in the inclined groove 42a on the corresponding side, the front side of the upper fixed sleeve 2a is provided with a protective shell 43a, the trigger assembly is located in the protective shell 43a, and the trigger rod 33a is in sliding connection with the protective shell 43a. The inclined groove 42a is arranged to avoid the problem of skew of the trigger rod 33a, and is used for planning the path of the trigger rod 33a.

[0084] The upper fixed sleeve 2 and the lower fixed sleeve 3 are respectively provided with a semicircular adjusting plate 45a which is in inner sliding connection. The adjusting plate 45a suitable for the diameter of the gas injection pipeline 1a can be selected, so that the gas injection pipeline 1a with different diameters can be used, and the rubber layer is arranged at the joint of the adjusting plate 45a and the gas injection pipeline 1a, so that the sealing property is improved.

[0085] When the gas injection pipeline leaks, the airflow drives the rotating fan 6a to rotate, the reciprocating rod 9a drives the trigger assembly to continuously lift the trigger rod 33a, until the trigger rod 33a is separated from the limiting rod 41a in the blocking assembly, the force storage spring 40a drives the blocking frame 38a to push the closure plug 11a into the ventilation pipe 5a and close the ventilation hole, the gas no longer forms airflow, the rotating fan 6a stops rotating and stops alarming, and continuous leakage can be avoided. The staff who receives the alarm can find the leakage position for maintenance.

[0086] In the description of the present specification, the description of the terms "preferred embodiment", "further embodiment", "other embodiment" or "specific example" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0087] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. A helium injection and brine displacement system for a salt cavern helium storage reservoir, characterized by, The system comprises sequentially connectable gas injection pipeline, gas injection well, salt cavern, brine discharge well, brine discharge pipeline, brine output pipeline and flushing pipeline, the gas injection pipeline is provided with wellhead gas injection gate valve, the gas injection pipeline is connected with the gas injection well through the opening of the wellhead gas injection gate valve, the brine discharge pipeline has wellhead brine discharge gate valve, first filter, brine discharge gate valve, sediment pipeline and direct output pipeline, the wellhead brine discharge gate valve, first filter and brine discharge gate valve are sequentially arranged, the brine discharge gate valve is connectable with the sediment pipeline or direct output pipeline, the direct output pipeline has direct output gate valve, the sediment pipeline and direct output pipeline are connectable with the brine output pipeline, the sediment pipeline comprises sequentially connectable sediment direct-through valve, sediment tank, brine output pump inlet valve, second filter and brine output pump, the flushing pipeline comprises water gate valve, flushing pump and water storage tank, the flushing pipeline is connected with the brine discharge pipeline through the opening of the water gate valve, and the flushing pipeline is connected between the wellhead brine discharge gate valve and the brine discharge gate valve. When the brine is discharged in the early stage and the late stage, the wellhead brine discharge gate valve, first filter, brine discharge gate valve, sediment direct-through valve, sediment tank, brine output pump inlet valve, second filter, brine output pump and brine output pipeline are sequentially connected. When the brine is normally discharged between the early stage and the late stage, the wellhead brine discharge gate valve, first filter, brine discharge gate valve, direct output pipeline and brine output pipeline are sequentially connected.

2. The salt cavern helium storage facility gas injection brine removal system of claim 1, wherein, The sediment pipeline further comprises check valve, brine output pump gate valve and brine output pump pressure gauge which are sequentially arranged after the brine output pump. When the brine is discharged in the early stage and the late stage, the wellhead brine discharge gate valve, first filter, brine discharge gate valve, sediment direct-through valve, sediment tank, brine output pump inlet valve, second filter, brine output pump, check valve and brine output pipeline are sequentially connected. The sediment pipeline further comprises water storage pipeline which is connected with external water storage tank, the water storage pipeline is provided with external gate valve, and the water storage pipeline is connected between the brine output pump inlet valve and the filter. The sediment tank is further connected with tap water pipeline.

3. The salt cavern helium reserve injection brine displacement system of claim 1, wherein, The brine output pipeline comprises first pipeline, second pipeline and brine output flowmeter, the first pipeline sequentially comprises first gate valve, electric regulating valve and brine output total gate valve, and the second pipeline is provided with second gate valve. When the brine is discharged in the early stage and the late stage, the wellhead brine discharge gate valve, first filter, brine discharge gate valve, sediment direct-through valve, sediment tank, brine output pump inlet valve, second filter, brine output pump, first gate valve, electric regulating valve, brine output total gate valve and brine output flowmeter are sequentially connected. When the brine is normally discharged between the early stage and the late stage, the wellhead brine discharge gate valve, first filter, brine discharge gate valve, direct output pipeline, first gate valve, electric regulating valve, brine output total gate valve and brine output flowmeter are sequentially connected.

4. The salt cavern helium reserve injection brine displacement system of claim 1, wherein, The brine discharge pipeline further comprises first emergency cut-off valve, pre-filter gate valve, post-filter gate valve and brine discharge flowmeter, When the brine is discharged in the early stage and the late stage, the wellhead brine discharge gate valve, first emergency cut-off valve, pre-filter gate valve, first filter, post-filter gate valve, brine discharge flowmeter, brine discharge gate valve, sediment direct-through valve, sediment tank, brine output pump inlet valve, second filter, brine output pump and brine output pipeline are sequentially connected. When the normal brine discharge is between the early stage of brine discharge and the late stage of brine discharge: the wellhead brine discharge gate valve, the first emergency cut-off valve, the pre-filter gate valve, the first filter, the post-filter gate valve, the brine discharge flow meter, the brine discharge gate valve, the direct delivery pipeline and the brine delivery pipeline are sequentially connected.

5. The salt cavern helium storage facility gas injection brine removal system of claim 4, wherein, The brine discharge pipeline further comprises a central pipeline, one end of the central pipeline being connected to the brine discharge well and the other end being connected to the pipeline between the first emergency cut-off valve and the pre-filter gate valve, the central pipeline comprising a central pipeline gate valve and a second emergency cut-off valve, the central pipeline gate valve being located at the end close to the brine discharge well; The flushing pipeline further comprises a flushing pump pressure gauge, a clean water flow meter, a pre-pump gate valve, a clean water end check valve, a post-pump gate valve and a clean water filter, the flushing pipeline further comprising a clean water standby pipeline, one end of the clean water standby pipeline being connected to the water storage tank and the other end being connected to the pipeline between the clean water end check valve and the flushing pump; During the gas injection and brine discharge process, backwashing is periodically performed, during which the clean water in the flushing pipeline sequentially passes through the water storage tank, the clean water filter, the pre-pump gate valve, the flushing pump, the clean water end check valve, the post-pump gate valve, the clean water flow meter, the clean water gate valve, the second emergency cut-off valve and the central pipeline gate valve, the central pipeline gate valve being connected to the flushing pipe, and the flushing pipe being connected to the bottom of the cavity sediment in the cavity of the salt cavern.

6. The salt cavern helium reserve injection brine displacement system of claim 1, wherein, The brine discharge pipeline further comprises a pre-filter gate valve, a post-filter gate valve and a brine discharge flow meter, The flushing pipeline further comprises a flushing pump pressure gauge, a clean water flow meter, a pre-pump gate valve, a clean water end check valve, a post-pump gate valve and a clean water filter, When the ground pipeline system needs to be flushed, the clean water sequentially passes through the water storage tank, the clean water filter, the pre-pump gate valve, the flushing pump, the clean water end check valve, the post-pump gate valve, the clean water flow meter, the clean water gate valve, the pre-filter gate valve, the first filter, the post-filter gate valve, the brine discharge flow meter, the brine discharge gate valve, the direct delivery pipeline and the brine delivery pipeline.

7. The salt cavern helium reserve injection brine displacement system of claim 1, wherein, The gas injection pipeline sequentially comprises an air compression pipeline, a gas injection gate valve, a first flow meter, a gate valve, a reducer, a pneumatic safety valve and a wellhead gas injection gate valve, the air compression pipeline comprising at least two groups, each group of the air compression pipeline sequentially comprising an air compressor unit, a second flow meter and a machine gate valve.

8. The salt cavern helium reserve injection brine displacement system of claim 1, wherein, The brine discharge pipeline further comprises a first emergency cut-off valve and a brine discharge flow meter, The brine discharge pipeline further comprises a brine discharge standby pipeline, the brine discharge standby pipeline having a standby gate valve, the two ends of the brine discharge standby pipeline being connected to the pipelines at the two ends of the filter in the brine discharge pipeline; When a large amount of sediment is detected to return from the wellhead of the brine discharge well: the wellhead brine discharge gate valve, the first emergency cut-off valve, the standby gate valve, the brine discharge flow meter, the brine discharge gate valve, the sediment pipeline and the brine delivery pipeline are sequentially connected.

9. The salt cavern helium reserve injection brine displacement system of claim 1, wherein, The injection pipeline is provided with a leakage-proof monitoring device at the joint of the injection pipeline, the leakage-proof monitoring device comprises an upper fixed sleeve and a lower fixed sleeve which can form a closed chamber, the joint of the injection pipeline is located in the closed chamber, a T-shaped ventilation pipe is fixedly connected to the upper end of the upper fixed sleeve, ventilation holes are respectively formed in the left and right sides of the ventilation pipe, one-way ventilation closing plugs are slidably connected in the ventilation holes, the ventilation pipe is in communication with the closed chamber, a rotary fan is arranged on the lower side of the ventilation pipe, a push rod is fixedly connected to the left end of an alarm assembly, a T-shaped push rod is fixedly connected to the left end of the alarm assembly, a sliding groove is formed in the left side of the push rod, and the lower side of the push rod is located in the sliding groove.

10. The salt cavern helium storage facility gas injection halogen removal system of claim 9, wherein, A trigger assembly is arranged on the front side of the upper end of the upper fixed sleeve, a T-shaped reciprocating rod is fixedly connected to the rear end of the trigger assembly, a movable slot is formed in the rear side of the reciprocating rod, the upper side of the push rod is located in the movable slot, supporting plates are respectively fixedly connected to the left and right sides of the ventilation pipe, locking assemblies are respectively arranged at the opposite ends of the two supporting plates, and the trigger assembly can trigger the locking assemblies on the two sides to block the closing plugs on the two sides from blocking the ventilation pipe.

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