Salt cavern gas storage gas injection and brine discharge system capable of reducing natural gas discharge risk

Abstract

The utility model relates to a salt-cavern gas storage gas injection and brine discharge system capable of reducing the risk of natural gas discharge, which comprises a brine discharge pipe column, a flash tank and two emergency cut-off valves, and one end of the brine discharge pipe column is communicated with the top of the flash tank; a detector for detecting natural gas is mounted at the top of the flash tank, and a brine outlet is formed in the bottom of the flash tank; and the two emergency cut-off valves are fixedly mounted on the brine discharging pipe column at an interval. The device has the beneficial effects that the structure is simple, the design is reasonable, a flash tank process is added on the basis of a direct discharge process aiming at the condition that natural gas enters a brine discharge pipeline along with discharged brine at the initial stage and the final stage of brine discharge, and the risk that the natural gas directly enters a brine discharge station is avoided; meanwhile, in order to avoid the situation that the emergency cut-off valve fails in emergency, an emergency cut-off valve is additionally arranged, and safety guarantee is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to salt cavern gas storage injection gas and halogen ground supporting equipment, safety production technical field, concretely relates to a salt cavern gas storage injection gas and halogen system of reducing natural gas discharge risk. BACKGROUND

[0002] Underground gas storage is an important part of natural gas market, and has irreplaceable role in peak shaving and emergency supply. Salt cavern underground gas storage is formed in the underground thick salt layer or salt dome by using salt mining, which can store natural gas, and has the advantages of flexible injection and production, large throughput, etc. After the dissolution of the salt cavern, the cavity is filled with brine, which needs to be discharged by injection, that is, injection and halogen removal. Injection and halogen removal technology is one of the core technologies of salt cavern gas storage, which has high technical requirements and great safety risks.

[0003] The conventional injection and halogen removal technology has the advantages of mature technology, and a complete technical system is formed in the construction process of setting salt cavern gas storage, but many problems are found in the application process of multi-well injection and halogen removal: during the injection and halogen removal process, the gas-water interface in the cavity exceeds the bottom of the halogen removal pipe column or the halogen removal pipeline leaks, high-pressure natural gas flows into the halogen removal pipeline, the pipeline pressure rises instantaneously, which causes the halogen removal pipeline to swing up and down violently, bend and deform, and cause the pipeline to flow. UTILITY MODEL CONTENT

[0004] The utility model provides a salt cavern gas storage injection gas and halogen system of reducing natural gas discharge risk, aims at solving the problem in prior art.

[0005] The technical scheme for solving the above technical problem of the utility model is as follows:

[0006] A salt cavern gas storage injection gas and halogen system of reducing natural gas discharge risk, comprising a halogen removal pipe column, a flash tank and two emergency shut-off valves, one end of the halogen removal pipe column is in communication with the top of the flash tank; a detector for detecting natural gas is installed on the top of the flash tank, and a halogen removal port is arranged at the bottom of the flash tank; the two emergency shut-off valves are fixedly installed on the halogen removal pipe column in an interval.

[0007] The utility model has the advantages that in the operation process, the halogen removal pipe column is used to discharge the brine in the salt cavern gas storage, and the two emergency shut-off valves are used in an alternate manner to cut off the halogen removal pipe column in an emergency;

[0008] In the process of halogen removal, if natural gas exists in the brine, flash tank is used for flash treatment, and the detector alarms when natural gas is detected, so that the operator can handle it in time and ensure safety in production.

[0009] The utility model discloses simple structure, reasonable in design, for the natural gas with the discharge brine into the brine discharge pipeline situation of brine discharge initial stage, final stage, increase a flash tank flow on the basis of direct discharge flow, avoided the risk of natural gas direct into the brine discharge station, simultaneously, to avoid the emergency situation emergency shut -off valve failure, add an emergency shut -off valve, improve the security guarantee.

[0010] On the basis of the above technical scheme, the utility model further can make improvement as follows.

[0011] Further, the other end of the brine discharge pipe column is fixedly installed with a brine discharge master valve.

[0012] The beneficial effect of the above further scheme is simple structure, reasonable in design, utilizes the brine discharge master valve to control the on-off of the whole brine discharge operation, and the operation is convenient.

[0013] Further, the brine discharge pipe column is fixedly installed with valve one at the position between the two emergency shut -off valves.

[0014] The beneficial effect of the above further scheme is simple structure, reasonable in design, utilizes valve one to further control the on-off of the whole brine discharge operation, and the operation is convenient.

[0015] Further, the brine discharge pipe column is fixedly installed with valve three at the position between the emergency shut -off valve close to the one end of the brine discharge pipe column and the flash tank.

[0016] The beneficial effect of the above further scheme is simple structure, reasonable in design, utilizes valve three to further control the on-off of the whole brine discharge operation, and the operation is convenient.

[0017] Further, it further includes low pressure valve group interval, and the brine discharge port is communicated with the low pressure valve group interval through the brine conveying pipe column.

[0018] The beneficial effect of the above further scheme is simple structure, reasonable in design, and the discharged brine is treated through the low pressure valve group interval, so that the brine can be sent to the set place for treatment subsequently.

[0019] Further, the brine conveying pipe column is fixedly installed with a brine conveying pump.

[0020] The beneficial effect of the above further scheme is simple structure, reasonable in design, and the brine conveying pump provides power for the discharge of the brine.

[0021] Further, the brine conveying pipe column is fixedly installed with valve four at the position between the brine conveying pump and the flash tank.

[0022] The beneficial effect of the above further scheme is simple structure, reasonable in design, and valve four realizes the on-off of the brine in the brine conveying pipe column, and the operation is convenient.

[0023] Further, one end of the brine discharging pipe column is communicated with the position between the brine discharging pump and the low pressure valve group through the standby pipe column, valve two is fixedly installed on the standby pipe column, valve five and valve six are fixedly installed on the position between the brine discharging pump and the low pressure valve group of the brine discharging pipe column, and the communication position of the standby pipe column and the brine discharging pipe column is located between valve five and valve six.

[0024] The beneficial effect of the above further scheme is that when the flash tank and the brine discharging pipe column fail during operation, the standby pipe column can be started to discharge brine, so that the normal operation of brine discharging is ensured.

[0025] Further, the back flushing pipe column and the water injection pump are further included, one end of the back flushing pipe column is communicated with the position between the two emergency cut-off valves of the brine discharging pipe column, and the other end is communicated with the outlet of the water injection pump.

[0026] The beneficial effect of the above further scheme is that the brine discharging operation can be closed at intervals, the back flushing pipe column and the water injection pump are started to perform reverse flushing on the whole system.

[0027] Further, the high pressure valve group is further included, the high pressure valve group is fixedly installed on the back flushing pipe column, a back flushing valve is fixedly installed on one end of the back flushing pipe column, valve seven is fixedly installed on the other end, and valve seven is located between the back flushing valve and the high pressure valve group.

[0028] The beneficial effect of the above further scheme is that the structure is simple, the design is reasonable, the reverse flushing water is controlled by the high pressure valve group, and the operation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the utility model.

[0030] In the drawings, the component list represented by each sign is as follows:

[0031] 1, brine discharging pipe column; 2, flash tank; 3, emergency cut-off valve; 4, detector; 5, brine discharging master valve; 6, valve one; 7, valve three; 8, low pressure valve group; 9, brine discharging pipe column; 10, brine discharging pump; 11, valve four; 12, standby pipe column; 13, valve two; 14, valve five; 15, valve six; 16, back flushing pipe column; 17, water injection pump; 18, high pressure valve group; 19, back flushing valve; 20, valve seven; 21, brine discharging pipe column; 22, brine discharging valve. DETAILED DESCRIPTION

[0032] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0033] In the description of the utility model, it needs to be understood that, the orientation or position relation indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relation shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model indicated or implied by the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0034] In the description of the utility model, it needs to be understood that, the orientation or position relation indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relation shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model indicated or implied by the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0035] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0036] Embodiment 1

[0037] As Figure 1 shown, the embodiment provides a salt cavern gas storage injection gas and halogen discharge system capable of reducing natural gas discharge risk, which comprises a halogen discharge pipe column 1, a flash tank 2 and two emergency shut-off valves 3, one end of the halogen discharge pipe column 1 is communicated with the top of the flash tank 2; a detector 4 for detecting natural gas is installed at the top of the flash tank 2, and a halogen discharge port is arranged at the bottom of the flash tank 2; the two emergency shut-off valves 3 are fixedly installed on the halogen discharge pipe column 1 at intervals.

[0038] During operation, the halogen brine in the salt cavern gas storage is discharged by using the halogen discharge pipe column 1, and one of the two emergency shut-off valves 3 is used as a spare one to shut off the halogen discharge pipe column 1 in an emergency;

[0039] During the halogen discharge process, if there is natural gas in the halogen brine, the flash tank 2 is used for flash evaporation treatment, and the detector 4 detects the natural gas and alarms to allow the operating personnel to handle it in time and ensure safety in production.

[0040] The embodiment has simple structure and reasonable design. In the case that natural gas is discharged into the brine discharge pipeline with brine at the initial and final stages of brine discharge, a flash tank process is added on the basis of the direct discharge process to avoid the risk of natural gas directly entering the brine discharge station. Meanwhile, an emergency shut-off valve is added to avoid the failure of the emergency shut-off valve in an emergency to improve safety protection.

[0041] Embodiment 2

[0042] In the embodiment, the other end of the brine discharge pipe column 1 is fixedly installed with a brine discharge master valve 5.

[0043] The scheme has simple structure and reasonable design. The brine discharge master valve 5 is used to control the on-off of the entire brine discharge operation, which is convenient.

[0044] Embodiment 3

[0045] In the embodiment, the valve one 6 is fixedly installed on the part between the two emergency shut-off valves 3 corresponding to the brine discharge pipe column 1.

[0046] The scheme has simple structure and reasonable design. The valve one 6 is used to further control the on-off of the entire brine discharge operation, which is convenient.

[0047] Embodiment 4

[0048] In the embodiment, the valve three 7 is fixedly installed on the part between the emergency shut-off valve 3 close to one end of the brine discharge pipe column 1 and the flash tank 2.

[0049] The scheme has simple structure and reasonable design. The valve three 7 is used to further control the on-off of the entire brine discharge operation, which is convenient.

[0050] Embodiment 5

[0051] In the embodiment, a low-pressure valve group interval 8 is further included, and the brine discharge port is communicated with the low-pressure valve group interval 8 through a brine conveying pipe column 9.

[0052] The scheme has simple structure and reasonable design. The discharged brine is treated by the low-pressure valve group interval 8 so as to be sent to a set place for treatment.

[0053] Preferably, in the embodiment, the low-pressure valve group interval 8 is communicated with one end of a brine discharge pipe column 21, and the other end of the brine discharge pipe column 21 is used to communicate with a set place.

[0054] In addition, a brine discharge valve 22 is fixedly installed on the brine discharge pipe column 21.

[0055] It should be noted that the low pressure valve group 8 described above uses the prior art, and its specific structure and principle will not be described here.

[0056] Embodiment 6

[0057] In this embodiment, the brine conveying pipe column 9 is fixedly installed with a brine conveying pump 10.

[0058] This scheme has simple structure and reasonable design, and uses the brine conveying pump 10 to provide power for the discharge of brine.

[0059] Embodiment 7

[0060] In this embodiment, the brine conveying pipe column 9 is fixedly installed with a valve four 11 at a position corresponding to the brine conveying pump 10 and the flash tank 2.

[0061] This scheme has simple structure and reasonable design, and uses the valve four 11 to realize the on-off of brine in the brine conveying pipe column 9, which is convenient for operation.

[0062] Embodiment 8

[0063] In this embodiment, one end of the brine discharging pipe column 1 is communicated with the brine conveying pipe column 9 at a position corresponding to the brine conveying pump 10 and the low pressure valve group 8 through a standby pipe column 12, and a valve two 13 is fixedly installed on the standby pipe column 12; a valve five 14 and a valve six 15 are fixedly installed on the brine conveying pipe column 9 at intervals at a position corresponding to the brine conveying pump 10 and the low pressure valve group 8, and the communication position of the standby pipe column 12 and the brine conveying pipe column 9 is located between the valve five 14 and the valve six 15.

[0064] When the flash tank 2 and the brine conveying pipe column 9 fail, the standby pipe column 12 can be used to discharge brine at this time, so as to ensure the normal operation of brine discharging.

[0065] Embodiment 9

[0066] On the basis of the above embodiments, this embodiment further comprises a backwashing pipe column 16 and a water injection pump 17, one end of the backwashing pipe column 16 is communicated with a position between the two emergency shut-off valves 3 of the brine discharging pipe column 1, and the other end is communicated with the outlet of the water injection pump 17.

[0067] After a certain period of time, the brine discharging operation can be closed, and the backwashing pipe column 16 and the water injection pump 17 are started to perform reverse flushing on the entire system.

[0068] Embodiment 10

[0069] On the basis of embodiment 6, this embodiment further comprises a high-pressure valve group 18 fixedly installed on the backwashing pipe column 16; one end of the backwashing pipe column 16 is fixedly installed with a backwashing valve 19, and the other end is fixedly installed with a valve 20, which is located between the backwashing valve 19 and the high-pressure valve group 18.

[0070] The scheme has simple structure and reasonable design, controls the reverse flushing water by the high-pressure valve group 18, and is convenient to operate.

[0071] It should be noted that the high-pressure valve group 18 is prior art, and its specific structure and principle are not described here.

[0072] The working principle of the utility model is as follows:

[0073] During operation, the brine in the salt cavern gas storage is discharged by the brine discharge pipe column 1, and two emergency shut-off valves 3 are used to cut off the brine discharge pipe column 1 in an emergency;

[0074] During the brine discharge process, if natural gas exists in the brine, the flash tank 2 is used for flash evaporation treatment, and the detector 4 detects natural gas and alarms to allow the operator to handle it in time and ensure safety in production;

[0075] The brine discharge operation can be closed regularly, and the backwashing pipe column 16 and the water injection pump 17 are started to backwash the whole system.

[0076] In order to realize the goal of low investment, safety and high efficiency in the construction process of the salt cavern gas storage, in the process of field operation and solving practical problems, the utility model provides a gas injection and brine discharge technology for reducing the risk of natural gas discharge, that is, a new emergency shut-off valve is added to the brine discharge pipe column to improve safety; the discharged brine passes through the flash tank to avoid direct discharge to the brine receiving station; an observation hole is drilled at the bottom of the brine discharge pipe column, and a neutron logging is used to judge the gas-liquid interface in time to avoid over-discharge; wireless pressure transmitters are installed on the brine discharge pipeline, the central pipe column and the buffer tank to remotely view the brine discharge pressure, and when the pressure is abnormal, the system alarms to allow the site to handle it in time.

[0077] It should be noted that all the electronic components involved in the utility model are prior art, and the above-mentioned components are electrically connected with the controller, and the control circuit between the controller and the components is prior art.

[0078] It is apparent to a person skilled in the art that the present application is not restricted to the details of the foregoing exemplary embodiments, but that the present application can be implemented in other embodiments without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in a descriptive sense only and not for purposes of limitation. The present application is defined by the appended claims rather than by the foregoing description, and all changes and modifications that come within the meaning and range of equivalents of the claims are to be embraced within the scope of the present application. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0079] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment according to the present specification needs to exhibit each and every characteristic listed in the embodiments. The specification can be described in terms of exemplary embodiments, however a single exemplary embodiment can include several independent sub-embodiments. Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment need include every independent sub-embodiment. The specification is intended to be construed as a whole and each embodiment can be combined with other embodiments in a manner understood by those skilled in the art.

[0080] The preferred embodiments of the present application are described above with the purpose not to limit the present application, but to more fully and completely describe it. Accordingly, any modification, equivalent replacement or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A gas injection and brine discharge system for a salt cavern gas storage that can reduce the risk of natural gas discharge, characterized in that: Including the halogen discharge pipe column (1), the flash tank (2) and two emergency shut-off valves (3), one end of the halogen discharge pipe column (1) is communicated with the top of the flash tank (2); The top of the flash tank (2) is provided with a detector (4) for detecting natural gas, and the bottom of the flash tank (2) is provided with a halogen discharge port; Two emergency shut-off valves (3) are fixedly installed on the halogen discharge pipe column (1).

2. The gas injection and brine discharge system capable of reducing the risk of natural gas emission of the salt cavern gas storage according to claim 1, characterized in that: The other end of the halogen discharge pipe column (1) is fixedly installed with a halogen discharge master valve (5).

3. The gas injection and brine discharge system capable of reducing the risk of natural gas emission for a salt cavern gas storage according to claim 1, characterized in that: The halogen discharge pipe column (1) is fixedly installed with valve one (6) corresponding to the part between the two emergency shut-off valves (3).

4. The gas injection and brine discharge system of the salt cavern gas storage that can reduce the risk of natural gas discharge according to claim 1, characterized in that: The halogen discharge pipe column (1) is fixedly installed with valve three (7) corresponding to the part between the emergency shut-off valve (3) close to one end of the halogen discharge pipe column (1) and the flash tank (2).

5. The gas injection and brine discharge system for salt cavern gas storage with reduced risk of natural gas release according to any one of claims 1-4, characterized in that: It also includes a low-pressure valve group (8), and the halogen discharge port is communicated with the low-pressure valve group (8) through a halogen conveying pipe column (9).

6. The gas injection and brine discharge system capable of reducing the risk of natural gas emission of the salt cavern gas storage according to claim 5, characterized in that: The halogen conveying pipe column (9) is fixedly installed with a halogen conveying pump (10).

7. The gas injection and brine discharge system capable of reducing the risk of natural gas emission of the salt cavern gas storage according to claim 6, characterized in that: The halogen conveying pipe column (9) is fixedly installed with valve four (11) corresponding to the part between the halogen conveying pump (10) and the flash tank (2).

8. The gas injection and brine discharge system capable of reducing the risk of natural gas emission of the salt cavern gas storage according to claim 6, characterized in that: One end of the halogen discharge pipe column (1) is communicated with the part between the halogen conveying pump (10) and the low-pressure valve group (8) of the halogen conveying pipe column (9) through a standby pipe column (12), and valve two (13) is fixedly installed on the standby pipe column (12); Valve five (14) and valve six (15) are fixedly installed on the halogen conveying pipe column (9) corresponding to the part between the halogen conveying pump (10) and the low-pressure valve group (8), and the communication between the standby pipe column (12) and the halogen conveying pipe column (9) is located between the valve five (14) and the valve six (15).

9. The gas injection and brine discharge system for salt cavern gas storage with reduced risk of natural gas release according to any one of claims 1-4, characterized in that: It also includes a backwashing pipe column (16) and a water injection pump (17), one end of the backwashing pipe column (16) is communicated with the part between the two emergency shut-off valves (3) of the halogen discharge pipe column (1), and the other end is communicated with the outlet of the water injection pump (17).

10. The gas injection and brine discharge system capable of reducing the risk of natural gas emission of the salt cavern gas storage according to claim 9, characterized in that: It also includes a high-pressure valve group (18), which is fixedly installed on the backwashing pipe column (16); One end of the backwashing pipe column (16) is fixedly installed with a backwashing valve (19), and the other end is fixedly installed with valve seven (20), which is located between the backwashing valve (19) and the high-pressure valve group (18).

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