Gas injection and brine discharge integrated mobile equipment structure for salt-cavern gas storage

Abstract

The utility model belongs to the technical field of salt cavern gas storage gas injection and brine discharge equipment, and particularly relates to a salt cavern gas storage gas injection and brine discharge integrated mobile equipment structure. By adopting a vehicle-mounted movable structure and reasonably arranging the brine buffer tank, the brine lifting pump, the basket filter, the medium pipelines, the pipeline valves, the instrument elements and the external interfaces, the whole structure is compact, the transportation is convenient, the function integration is high, and the operation is simple; the device can quickly move and be connected into a gas injection and brine discharge pipeline built at each wellhead site of the salt-cavern gas storage to execute gas injection and brine discharge work, has very high universality and adaptability, and can effectively reduce the equipment cost of gas injection and brine discharge of the salt-cavern gas storage; the device is high in maneuverability, easy to install and maintain, wide in application range, high in safety performance, good in economic benefit and easy to popularize, the occupied space of gas injection and brine discharge facilities of all the reservoirs can be greatly saved, the working efficiency of gas injection and brine discharge is improved, and the purpose of quick production and effectiveness of the salt cavern reservoirs is achieved.

Description

Technical Field

[0001] This utility model belongs to the technical field of gas injection and brine discharge equipment for salt cavern gas storage, specifically relating to an integrated mobile device structure for gas injection and brine discharge in salt cavern gas storage. Background Technology

[0002] Underground gas storage facilities are a crucial component of the natural gas market, playing an irreplaceable role in peak shaving and emergency supply. Salt cavern underground gas storage facilities are caverns formed in thick salt layers or salt domes underground using salt-dissolving mining methods, capable of storing natural gas. They offer advantages such as flexible gas injection and extraction, and high throughput. After the salt cavern is dissolved, it is filled with brine, which needs to be drained through gas injection—this is the initial brine drainage. Initial brine drainage technology is one of the core technologies of salt cavern gas storage, requiring advanced technology. Currently, commonly used gas injection and brine drainage technologies are relatively mature, and safety risks are controllable.

[0003] The gas injection and brine removal cycle for a single cavity is about 3-6 months. Current technology usually involves setting up one gas injection and brine removal device for each well. After the gas injection and brine removal is completed, the device is removed or disassembled and then reinstalled at other wellheads. This approach results in a waste of resources such as equipment, valves, and pipelines, and increases project costs. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an integrated mobile device structure for gas injection and brine discharge in salt cavern gas storage. The structure is compact, easy to move and transport, highly integrated, and easy to operate. It can be quickly connected to the existing gas injection and brine discharge pipelines at each wellhead through multiple external interfaces to perform gas injection and brine discharge work. It has strong versatility and adaptability and can significantly reduce the equipment cost of gas injection and brine discharge in salt cavern gas storage.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A mobile equipment structure for a salt cavern gas storage facility integrating gas injection and brine discharge mainly includes: a mobile transport mechanism 9, an equipment housing 1, a brine buffer tank 2, a brine booster pump 3, a basket filter 4, multiple sets of media pipelines and pipeline valves, instrument components, external interfaces, and an explosion-proof RTU (remote communication) control cabinet 8.

[0007] The medium pipeline includes a brine return pipeline 61. One end of the brine return pipeline 61 is connected to the brine discharge pipeline at the wellhead via an external interface 101, and the other end is connected to the brine disposal facility pipeline via an external interface 103. The middle part of the brine return pipeline 61 is connected to the inlet of the brine buffer tank 2 via a brine inlet buffer tank pipeline 63. A liquid collection bag 23 is installed at the bottom of the brine buffer tank 2. The outlet of the liquid collection bag 23 is connected to the input end of the brine lift pump 3 via a brine outlet buffer tank pipeline 64. The output end of the brine lift pump 3 is connected to the external interface 103 via a brine outlet lift pump pipeline 65.

[0008] The end of the brine return pipeline 61 near the external interface 101 is connected to the external interface 2 102 via the flushing pipeline 62. The drain outlets of the brine buffer tank 2 and the liquid accumulation bag 23 are both connected to the external interface 4 104 via the drain pipeline 66. The external interface 2 102 and the external interface 4 104 are respectively connected to the flushing facility pipeline and the drain facility pipeline.

[0009] The equipment housing 1 is equipped with a remote communication control cabinet 8 at its bottom. The pipeline valves and instrument components are all electrically connected to the remote communication control cabinet 8, and the equipment housing 1 is mounted on a mobile transportation mechanism 9.

[0010] Preferably, the mobile transport mechanism 9 includes a steel skid 91 fixedly supported at the bottom of the equipment housing 1, and a plurality of moving wheels 92 are installed at the bottom of the steel skid 91.

[0011] Preferably, the pipeline valves include a brine return pipeline ball valve 51, a flushing pipeline ball valve 52, a brine booster pump pipeline ball valve 53, and a sewage discharge pipeline ball valve 54, which are respectively installed on the brine return pipeline 61, the flushing pipeline 62, the brine booster pump pipeline 65, and the sewage discharge pipeline 66.

[0012] Preferably, a brine return pipeline shut-off valve 55 is provided between the brine return pipeline ball valve 51 and the external interface 103; a brine inlet buffer tank pipeline shut-off valve 56 and a brine outlet buffer tank pipeline shut-off valve 57 are respectively installed on the brine inlet buffer tank pipeline 63 and the brine outlet buffer tank pipeline 64; and a sleeve-type drain valve 59 is provided between the sewage discharge pipeline ball valve 54 and the external interface 104.

[0013] Preferably, a basket filter 4 is provided between the brine buffer tank pipeline shut-off valve 57 and the input end of the brine booster pump 3, and a check valve 58 is provided between the output end of the brine booster pump 3 and the booster pump pipeline ball valve 53.

[0014] Preferably, the instrumentation includes a pressure gauge 71 installed on the flushing pipeline 62 and the brine booster pump pipeline 65, and a level gauge and a level transmitter installed inside the brine buffer tank 2.

[0015] Preferably, the top of the brine buffer tank 2 is equipped with multiple breather valves 24, and the top and end of the brine buffer tank 2 are respectively provided with manhole 1 21 and manhole 22.

[0016] Preferably, external interface 101 and external interface 102 are both located on the top of the device housing 1, and external interface 3 103 and external interface 4 104 are respectively located at the lower front and lower rear of the device housing 1.

[0017] Preferably, the explosion-proof RTU (remote communication) control cabinet is connected to the pipeline valves and instrument components through multiple sets of data acquisition interfaces, and the explosion-proof RTU (remote communication) control cabinet is equipped with a data acquisition board, an industrial Ethernet switch and a wireless communication module (4G network card) to read and acquire the pressure, flow, liquid level data of the equipment and the status information of each pipeline valve, and transmit them to the upper station control management system through wired or wireless communication.

[0018] Compared with the prior art, the present invention has the following main advantages:

[0019] 1. This utility model adopts a vehicle-mounted mobile structure. Through the reasonable arrangement of brine buffer tank, brine booster pump, basket filter, various medium pipelines and pipeline valves, instrument components and external interfaces, the overall structure is compact, convenient to transport, highly integrated and easy to operate. It can be quickly moved and connected to the existing gas injection and brine discharge pipelines at each wellhead of the salt cavern gas storage to perform gas injection and brine discharge work. It has strong versatility and adaptability and can effectively reduce the equipment cost of gas injection and brine discharge in salt cavern gas storage.

[0020] 2. The integrated mobile device of this utility model is equipped with an explosion-proof RTU (remote communication) control cabinet. Through the data acquisition board, industrial Ethernet switch and wireless communication module (4G network card) installed inside, it can quickly and efficiently read and collect the pressure, flow, liquid level data of the equipment and the status information of each pipeline valve, and transmit them to the upper station control management system through wired or wireless communication, which facilitates on-site equipment management.

[0021] 3. This utility model is highly mobile, easy to install and maintain, and can significantly save the space occupied by the gas injection and brine discharge facilities in each storage facility, improve the efficiency of gas injection and brine discharge, and achieve the goal of rapid commissioning and effectiveness of salt cavern storage facilities. It has a wide range of applications, high safety performance, good economic benefits, and is easy to promote. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the integrated gas injection and brine discharge mobile device for salt cavern gas storage in this embodiment of the present invention.

[0023] In the diagram: 1-Equipment housing; 2-Brine buffer tank; 21-Manhole 1; 22-Manhole 2; 23-Accumulation bag; 24-Breath valve; 3-Brine booster pump; 4-Basket filter; 51-Brine return pipeline ball valve; 52-Flushing pipeline ball valve; 53-Booster pump pipeline ball valve; 54-Sewage discharge pipeline ball valve; 55-Brine return pipeline shut-off valve; 56-Brine buffer tank inlet pipeline shut-off valve; 57-Brine buffer tank outlet pipeline shut-off valve; 58-Check valve 59-Sleeve-type drain valve; 61-Return brine pipeline; 62-Flushing pipeline; 63-Inlet brine buffer tank pipeline; 64-Outlet brine buffer tank pipeline; 65-Outlet brine booster pump pipeline; 66-Drainage pipeline; 71-Pressure gauge; 8-Remote communication control cabinet; 9-Mobile transportation mechanism; 91-Steel skid seat; 92-Moving wheels; 101-External interface one; 102-External interface two; 103-External interface three; 104-External interface four. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0028] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0029] like Figure 1 As shown, this application provides a structure for an integrated mobile device for gas injection and brine discharge in a salt cavern gas storage facility, which mainly includes: a mobile transport mechanism 9, a housing 1, a brine buffer tank 2, a brine booster pump 3, a basket filter 4, multiple sets of media pipelines and pipeline valves, instrument components, external interfaces, and an explosion-proof RTU (remote communication) control cabinet 8.

[0030] The medium pipeline includes a brine return pipeline 61. One end of the brine return pipeline 61 is connected to the wellhead brine discharge pipeline through an external interface 101, and the other end is connected to the brine disposal facility pipeline through an external interface 103. The middle part of the brine return pipeline 61 is connected to the inlet of the brine buffer tank 2 through a brine inlet buffer tank pipeline 63. A liquid collection bag 23 is installed at the bottom of the brine buffer tank 2. The outlet of the liquid collection bag 23 is connected to the input end of the brine lift pump 3 through a brine outlet buffer tank pipeline 64. The output end of the brine lift pump 3 is connected to the external interface 103 through a brine outlet lift pump pipeline 65.

[0031] The end of the brine return pipeline 61 near the external interface 101 is connected to the external interface 2 102 via the flushing pipeline 62. The drain outlets of the brine buffer tank 2 and the liquid accumulation bag 23 are both connected to the external interface 4 104 via the drain pipeline 66. The external interface 2 102 and the external interface 4 104 are respectively connected to the flushing facility pipeline and the drain facility pipeline.

[0032] Furthermore, the pipeline valves include a brine return pipeline ball valve 51, a flushing pipeline ball valve 52, a brine booster pump pipeline ball valve 53, and a sewage discharge pipeline ball valve 54, which are respectively installed on the brine return pipeline 61, the flushing pipeline 62, the brine booster pump pipeline 65, and the sewage discharge pipeline 66.

[0033] Furthermore, a brine return pipeline shut-off valve 55 is provided between the brine return pipeline ball valve 51 and the external interface 103; a brine inlet buffer tank pipeline shut-off valve 56 and a brine outlet buffer tank pipeline shut-off valve 57 are respectively installed on the brine inlet buffer tank pipeline 63 and the brine outlet buffer tank pipeline 64; and a sleeve-type drain valve 59 is provided between the sewage discharge pipeline ball valve 54 and the external interface 104.

[0034] Furthermore, a basket filter 4 is provided between the brine buffer tank pipeline shut-off valve 57 and the input end of the brine booster pump 3, and a check valve 58 is provided between the output end of the brine booster pump 3 and the booster pump pipeline ball valve 53.

[0035] In this embodiment, the brine booster pump 3 is a vertical centrifugal pump, including a pump body, motor, coupling and protective cover, mechanical seal, base, and necessary automatic control devices.

[0036] Furthermore, the instrumentation includes a pressure gauge 71 installed on the flushing pipeline 62 and the brine booster pump pipeline 65, and a level gauge and a level transmitter installed inside the brine buffer tank 2.

[0037] In this embodiment, the pressure gauge 71 is a shock-resistant diaphragm pressure gauge, which can be used to check the pipeline pressure on site; the level transmitter 2 is a magnetic float level transmitter.

[0038] Furthermore, the top of the brine buffer tank 2 is equipped with multiple breather valves 24, and the top and end of the brine buffer tank 2 are respectively provided with manhole one 21 and manhole two 22.

[0039] In this embodiment, the brine buffer tank adopts a horizontal gravity separator. The gas phase is automatically discharged through the breather valve on the top of the brine buffer tank, and the liquid phase is transported to the brine disposal facility (brine collection and transportation station) for further processing after sedimentation and filtration.

[0040] Furthermore, external interface 101 and external interface 102 are both located on the top of the device housing 1, and external interface 3 103 and external interface 4 104 are respectively located on the lower front and lower rear of the device housing 1.

[0041] Furthermore, a remote communication control cabinet 8 is installed at the bottom of the equipment housing 1, and the pipeline valves and instrument components are all electrically connected to the remote communication control cabinet 8, and the equipment housing 1 is mounted on a mobile transport mechanism 9;

[0042] The mobile transport mechanism 9 includes a steel skid base 91 fixedly supported at the bottom of the equipment housing 1, and a plurality of moving wheels 92 are installed at the bottom of the steel skid base 91.

[0043] Furthermore, the explosion-proof RTU (remote communication unit) control cabinet is connected to the pipeline valves and instrument components through multiple sets of data acquisition interfaces. The explosion-proof RTU (remote communication unit) control cabinet is equipped with a data acquisition board, an industrial Ethernet switch and a wireless communication module (4G network card) to read and acquire the pressure, flow, liquid level data of the equipment and the status information of each pipeline valve. The data is then transmitted to the upper station control management system via wired or wireless communication, which facilitates on-site equipment management and ensures the reliable operation of the on-site equipment and the overall system.

[0044] The equipment in this application is prefabricated in the factory and then installed on a vehicle. After a simple connection to the existing gas injection and brine discharge pipeline, it can be put into use quickly. It significantly improves the efficiency and safety of gas injection and brine discharge in salt cavern storage, and can achieve the goal of rapid production and effectiveness of salt cavern storage.

[0045] The specific working principle is as follows:

[0046] 1) In the early stage of gas injection and brine discharge, the saturated brine in the storage is lifted back to the surface wellhead by high-pressure gas injection, and then connected to the brine return pipeline 61 through the wellhead pipeline. After passing through the brine return pipeline shut-off valve 55, it is transported to the brine disposal facility for treatment.

[0047] 2) In the later stage of gas injection and brine discharge, a two-phase flow of brine and gas may occur. The brine with gas in the storage is lifted to the wellhead by gas pressure and then connected to the brine return pipeline 61 through the wellhead pipeline. After passing through the brine return pipeline ball valve 51 and the brine inlet buffer tank pipeline shut-off valve 56, it enters the brine buffer tank 2. A breather valve 24 is installed on the upper part of the brine buffer tank. The gas phase is vented locally through the breather valve, and the liquid phase enters the liquid collection bag 23. Then, it enters the brine outlet buffer tank pipeline 64 and the brine outlet buffer tank pipeline shut-off valve 57 before entering the basket filter 4 to filter solid impurities in the brine. The qualified brine is lifted by the brine lift pump 3 and then transported to the brine disposal facility for treatment after passing through the brine outlet lift pump pipeline 65, check valve 58 and lift pump pipeline ball valve 53.

[0048] 3) Backwashing process stage: Salt crystals will form on the wellbore, the integrated gas injection and brine discharge equipment of the salt cavern storage, and the surface brine discharge pipeline after long-term immersion in brine, requiring regular flushing. High-pressure brine (pressure ≤1MPa) from external flushing facilities is used to thoroughly flush the wellbore, the integrated gas injection and brine discharge equipment of the salt cavern storage, and the surface brine discharge pipeline through the flushing process interface.

[0049] This application discloses an integrated gas injection and brine discharge mobile device for salt cavern gas storage. Based on the processing capacity of the brine buffer tank and brine booster pump, it can achieve a brine discharge operation pressure of 0.3~1MPa and a discharge flow rate of 30~120m³ / h. 3 With a processing capacity of / h, it can meet the gas injection and brine discharge needs of storage facilities of different volumes.

[0050] Furthermore, all parts of this application that are not described in detail are the same as or implemented using existing technology.

[0051] In summary:

[0052] 1. This utility model adopts a vehicle-mounted mobile structure. Through the reasonable arrangement of brine buffer tank, brine booster pump, basket filter, various medium pipelines and pipeline valves, instrument components and external interfaces, the overall structure is compact, convenient to transport, highly integrated and easy to operate. It can be quickly moved and connected to the existing gas injection and brine discharge pipelines at each wellhead of the salt cavern gas storage to perform gas injection and brine discharge work. It has strong versatility and adaptability and can effectively reduce the equipment cost of gas injection and brine discharge in salt cavern gas storage.

[0053] 2. The integrated mobile device of this utility model is equipped with an explosion-proof RTU (remote communication) control cabinet. Through the data acquisition board, industrial Ethernet switch and wireless communication module (4G network card) installed inside, it can quickly and efficiently read and collect the pressure, flow, liquid level data of the equipment and the status information of each pipeline valve, and transmit them to the upper station control management system through wired or wireless communication, which facilitates on-site equipment management.

[0054] 3. This utility model is highly mobile, easy to install and maintain, and can significantly save the space occupied by the gas injection and brine discharge facilities in each storage facility, improve the efficiency of gas injection and brine discharge, and achieve the goal of rapid commissioning and effectiveness of salt cavern storage facilities. It has a wide range of applications, high safety performance, good economic benefits, and is easy to promote.

[0055] The above embodiments are only used to illustrate the design concept and features of this utility model, and their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. The protection scope of this utility model is not limited to the above embodiments. Therefore, all equivalent changes or modifications made based on the principles and design ideas disclosed in this utility model are within the protection scope of this utility model.

Claims

1. A mobile equipment structure for integrated gas injection and brine discharge in a salt cavern gas storage facility, characterized in that: Includes a brine buffer tank (2), a brine booster pump (3), a basket filter (4), multiple media pipelines and corresponding pipeline valves and instrument components located inside the equipment housing (1); The medium pipeline includes a brine return pipeline (61), one end of which is connected to the wellhead brine discharge pipeline via external interface one (101), and the other end is connected to the brine disposal facility pipeline via external interface three (103). The middle part of the brine return pipeline (61) is connected to the inlet of the brine buffer tank (2) via the brine inlet buffer tank pipeline (63). A liquid collection bag (23) is installed at the bottom of the brine buffer tank (2). The outlet of the liquid collection bag (23) is connected to the input end of the brine lift pump (3) via the brine outlet buffer tank pipeline (64). The output end of the brine lift pump (3) is connected to the external interface three (103) via the brine outlet lift pump pipeline (65). The end of the brine return pipeline (61) near the first external interface (101) is connected to the second external interface (102) via the flushing pipeline (62). The drain outlets of the brine buffer tank (2) and the liquid collection bag (23) are both connected to the fourth external interface (104) via the drain pipeline (66). The second external interface (102) and the fourth external interface (104) are respectively connected to the flushing facility pipeline and the drain facility pipeline. The equipment housing (1) is equipped with a remote communication control cabinet (8) at the bottom. The pipeline valves and instrument components are electrically connected to the remote communication control cabinet (8), and the equipment housing (1) is mounted on a mobile transportation mechanism (9).

2. The integrated gas injection and brine discharge mobile device structure for a salt cavern gas storage facility according to claim 1, characterized in that: The mobile transport mechanism (9) includes a steel skid (91) fixedly supported at the bottom of the equipment housing (1), and a plurality of wheels (92) are installed at the bottom of the steel skid (91).

3. The integrated gas injection and brine discharge mobile device structure for a salt cavern gas storage facility according to claim 1, characterized in that: The pipeline valves include a brine return pipeline ball valve (51), a flushing pipeline ball valve (52), a brine booster pump pipeline ball valve (53), and a sewage discharge pipeline ball valve (54) respectively installed on the brine return pipeline (61), the flushing pipeline (62), the brine booster pump pipeline (65), and the sewage discharge pipeline (66).

4. The integrated gas injection and brine discharge mobile device structure for a salt cavern gas storage facility according to claim 3, characterized in that: A brine return pipeline shut-off valve (55) is provided between the ball valve (51) of the brine return pipeline and the external interface three (103). A brine inlet buffer tank pipeline shut-off valve (56) and a brine outlet buffer tank pipeline shut-off valve (57) are respectively installed on the brine inlet buffer tank pipeline (63) and the brine outlet buffer tank pipeline (64). A valve sleeve type drain valve (59) is provided between the ball valve (54) of the drain pipeline and the external interface four (104).

5. The integrated gas injection and brine discharge mobile device structure for a salt cavern gas storage facility according to claim 4, characterized in that: A basket filter (4) is provided between the brine buffer tank pipeline shut-off valve (57) and the input end of the brine booster pump (3), and a check valve (58) is provided between the output end of the brine booster pump (3) and the booster pump pipeline ball valve (53).

6. The integrated gas injection and brine discharge mobile device structure for a salt cavern gas storage facility according to claim 1, characterized in that: The instrumentation includes a pressure gauge (71) installed on the flushing pipeline (62) and the brine booster pump pipeline (65), and a level gauge and a level transmitter installed inside the brine buffer tank (2).

7. The integrated gas injection and brine discharge mobile device structure for a salt cavern gas storage facility according to claim 1, characterized in that: The brine buffer tank (2) is equipped with multiple breathing valves (24) on its top, and manhole one (21) and manhole two (22) are respectively provided on the top and end of the brine buffer tank (2).

8. The integrated gas injection and brine discharge mobile device structure for a salt cavern gas storage facility according to claim 1, characterized in that: External interface one (101) and external interface two (102) are both located on the top of the device housing (1), and external interface three (103) and external interface four (104) are respectively located at the lower front and lower rear of the device housing (1).

9. The integrated gas injection and brine discharge mobile device structure for a salt cavern gas storage facility according to claim 1, characterized in that: The remote communication control cabinet (8) is connected to the pipeline valves and instrument components through multiple sets of data acquisition interfaces, and the remote communication control cabinet (8) is equipped with a data acquisition board, an Ethernet switch and a wireless communication module.

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