Injection-production valve group skid-mounted device and underground gas storage
By integrating injection and production valve groups onto skids and sharing a single injection and production pipeline, the problem of redundant pressure transmission pipelines in underground gas storage injection and production wells was solved, thereby reducing project costs and improving the safety and reliability of operation and management.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA PETROLEUM & CHEMICAL CORP
- Filing Date
- 2025-04-14
- Publication Date
- 2026-04-17
AI Technical Summary
The existing underground gas storage facilities use two independent pressure transmission pipelines for injection and production wells, resulting in high initial construction investment and high subsequent maintenance costs for surface engineering.
The injection and production valve assembly is skid-mounted, integrating the injection and production pipelines, sharing a single injection and production line. Combined with a mixed-phase flow meter and an emergency shut-off valve, it achieves integration of the injection and production processes, reducing pipeline redundancy.
It reduces project costs, facilitates operation and management, improves safety and reliability, and reduces maintenance costs.
Smart Images
Figure CN224134613U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of natural gas gathering and transmission technology, specifically relating to a skid-mounted injection and production valve assembly and an underground gas storage facility. Background Technology
[0002] For depleted natural gas production wells, they are typically converted into injection-production wells. The wellhead of the injection-production well is connected to the gathering and injection station via a high-pressure pipeline, and to the gathering and injection stations via a low-pressure pipeline, thus serving as an underground gas storage facility. The underground gas storage facility operates in a cyclical mode. During injection, high-pressure natural gas from the gathering and injection station enters the injection-production well through the high-pressure pipeline and is stored in the target formation. During production, low-pressure natural gas collected from the injection-production well enters the gathering station via the low-pressure pipeline. At the gathering station, single-well metering, oil-gas separation, and pre-drying processes are performed. The gas is then transported to the gathering and injection station in dry state. After separation and filtration at the gathering and injection station, it enters the natural gas dehydration treatment unit for dehydration treatment. Once it meets the standards, the qualified natural gas is metered and transported to the gas transmission network, supplementing the gas pipelines and entering the target market to meet seasonal peak demand. As an energy infrastructure integrating seasonal peak shaving, emergency supply, and energy reserves, the underground gas storage facility is the foundation for ensuring a long-term stable supply of natural gas and a major means of resolving periodic gas shortages.
[0003] In existing technologies, injection and production wells in underground gas storage facilities typically use two separate pressure transmission pipelines, resulting in high initial investment in surface engineering and increased labor and equipment costs for subsequent maintenance. Utility Model Content
[0004] The purpose of this application is to provide a skid-mounted injection-production valve assembly and an underground gas storage facility to solve the problem of redundant pressure transmission pipelines in the injection-production wells of the underground gas storage facility, thereby reducing project costs, facilitating operation and management, and ensuring safety and reliability.
[0005] To achieve the above objectives, the first aspect of this application provides a skid-mounted injection / production valve assembly, comprising:
[0006] The gas injection pipeline is equipped with a gas injection inlet, a gas injection control valve, a check valve, and a gas injection outlet connected in sequence.
[0007] The gas extraction pipeline is equipped with a gas extraction inlet, a throttle valve, a gas extraction control valve, and a gas extraction outlet connected in sequence.
[0008] The gas injection inlet and the gas production outlet merge to form an injection-production interface.
[0009] In some embodiments, the injection-production valve assembly skid also includes a mixed-phase flow meter capable of remote online gas-liquid metering without the need for separate gas-liquid separation, the mixed-phase flow meter being connected in series with the gas injection pipeline and the gas production pipeline.
[0010] In some embodiments, the mixed-phase flow meter is a bidirectional gas-liquid flow meter, the gas injection control valve includes a first gas injection control valve and a second gas injection control valve connected in series, the gas sampling control valve includes a first gas sampling control valve and a second gas sampling control valve connected in series, and the mixed-phase flow meter is simultaneously connected in series between the first gas injection control valve and the second gas injection control valve, and between the first gas sampling control valve and the second gas sampling control valve.
[0011] In some embodiments, the injection-production valve assembly skid also includes an emergency shut-off valve that can automatically shut off the pipeline in the event of overpressure in the injection pipeline or the production pipeline. The emergency shut-off valve is connected in series between the injection control valve and the check valve, and between the throttle valve and the production control valve.
[0012] In some embodiments, the injection-production valve assembly skid also includes an alcohol injection line capable of mixing alcohol liquid into the injection line or the production line, the alcohol injection line being connected in parallel to the injection line and the production line, respectively.
[0013] In some embodiments, the throttle valve includes a first throttle valve and a second throttle valve connected in series, capable of performing staged throttling.
[0014] In some embodiments, the first throttle valve is an electric angle throttle valve, and the second throttle valve is a nozzle sleeve.
[0015] In some embodiments, the gas injection control valve or the gas sampling control valve is an electric ball valve.
[0016] A second aspect of this application provides an underground gas storage facility, including an injection-production well, an injection-production pipeline, and a skid-mounted injection-production valve assembly; the wellhead of the injection-production well is respectively connected to the gas injection outlet and the gas production inlet via pipelines; one end of the injection-production pipeline is connected to the injection-production interface.
[0017] In some embodiments, the maximum flow rate of the injection-production pipeline is not less than 20 × 10⁻⁶. 4 m 3 / d, with a pressure resistance of not less than 16Mpa.
[0018] Compared with the prior art, the beneficial effects of this application are as follows:
[0019] The skid-mounted injection and production valve assembly of this application integrates the injection pipeline and the production pipeline, enabling the injection and production wells of underground gas storage facilities to achieve the injection and production processes using only one set of shared injection and production pipelines. This solves the problem of redundant pressure transmission pipelines for the injection and production wells of underground gas storage facilities, thereby reducing project costs, facilitating operation and management, and ensuring safety and reliability.
[0020] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description
[0021] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:
[0022] Figure 1 This is a structural diagram of an underground gas storage facility according to a specific embodiment of this application.
[0023] Explanation of reference numerals in the attached drawings: 1. Gas injection pipeline; 11. First gas injection control valve; 12. Second gas injection control valve; 13. Check valve; 2. Gas production pipeline; 21. First throttle valve; 22. Second throttle valve; 23. First gas production control valve; 24. Second gas production control valve; 3. Mixed phase flow meter; 4. Emergency shut-off valve; 5. Methanol injection pipeline; 6. Injection-production well; 7. Injection-production line. Detailed Implementation
[0024] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.
[0025] like Figure 1 As shown, a skid-mounted injection / production valve assembly includes:
[0026] The gas injection pipeline 1 is provided with a gas injection inlet, a gas injection control valve, a check valve 13 and a gas injection outlet connected in sequence;
[0027] Gas collection pipeline 2 is equipped with a gas collection inlet, a throttle valve, a gas collection control valve, and a gas collection outlet connected in sequence.
[0028] The gas injection inlet and gas production outlet merge to form the injection-production interface.
[0029] In this application, the injection-production valve assembly skid-mounted, as an integrated injection-production device, has three external interfaces: an injection-production interface, an injection outlet, and a production inlet. When applied to an underground gas storage facility, the injection-production interface is connected to the gas gathering station and the gas gathering and injection station via a shared injection-production pipeline 7. The injection outlet and production inlet are connected to the wellheads of the injection-production wells 6 via pipelines. During injection, high-pressure natural gas from the gas gathering station and the gas gathering and injection station sequentially passes through the injection-production pipeline 7, the injection-production interface, the injection control valve, the check valve 13, and the injection outlet, entering the injection-production well 6 and being stored in the target formation, thus achieving the purpose of utilizing underground space for gas storage. During production, low-pressure natural gas from the injection-production well 6 sequentially passes through the production inlet, the throttle valve, the production control valve, the injection-production interface, and the injection-production pipeline 7 to the gas gathering station and the gas gathering and injection station. The injection control valve is used to open and close the injection pipeline 1, the production control valve is used to open and close the production circuit, and the throttle valve is used to limit the gas flow rate within the production pipeline 2. Because the injection and production valve group skid-mounted adopts an integrated design that combines injection and production, the injection and production processes of the underground gas storage facility share a single injection and production pipeline 7. This solves the problem of redundant pressure transmission pipelines in the injection and production wells 6 of the underground gas storage facility, achieving the effects of reducing project costs, facilitating operation and management, and ensuring safety and reliability.
[0030] Specifically, the injection-production valve assembly skid also includes a miscible flow meter 3 capable of remote online gas-liquid metering without the need for separate gas-liquid separation. The miscible flow meter 3 is connected in series with the injection line 1 and the production line 2. The miscible flow meter 3 provides accurate injection or production metering for the natural gas injection or production process. The injection line 1 and the production line 2 can use the miscible flow meter 3 individually or together. When used together, if the miscible flow meter 3 is connected to the injection line 1 in the forward direction, it is connected to the production line 2 in the reverse direction, and vice versa.
[0031] Furthermore, the mixed-phase flow meter 3 is a bidirectional gas-liquid flow meter. The gas injection control valve includes a first gas injection control valve 11 and a second gas injection control valve 12 connected in series. The gas sampling control valve includes a first gas sampling control valve 23 and a second gas sampling control valve 24 connected in series. The mixed-phase flow meter 3 is connected in series between the first gas injection control valve 11 and the second gas injection control valve 12, and between the first gas sampling control valve 23 and the second gas sampling control valve 24.
[0032] Specifically, the injection and production valve assembly skid also includes an emergency shut-off valve 4 that can automatically shut off the pipeline when the injection pipeline 1 or the production pipeline 2 is overpressurized. The emergency shut-off valve 4 is connected in series between the injection control valve and the check valve 13, as well as between the throttle valve and the production control valve.
[0033] Specifically, the injection-production valve assembly skid also includes an alcohol injection line 5, which can mix alcohol liquid into the injection line 1 or the production line 2. The alcohol injection line 5 is connected in parallel to the injection line 1 and the production line 2, respectively. For low-pressure injection-production wells 6 with an injection-production pipeline 7 longer than 1 km, using a mobile methanol injection device to mix methanol into the injection line 1 or the production line 2 through the alcohol injection line 5 can prevent natural gas from forming hydrates and clogging the pipeline during transportation.
[0034] Specifically, the throttling valve includes a first throttling valve 21 and a second throttling valve 22 connected in series to perform staged throttling. The dual throttling valves can limit the gas flow rate in the gas production pipeline 2 to prevent gas cavitation in the tubing, including the injection and production pipeline 7; at the same time, by adjusting the flow rate of natural gas and controlling its flow rate, it can also prevent the formation of hydrates.
[0035] Furthermore, the first throttle valve 21 is an electric angle throttle valve, and the second throttle valve 22 is a nozzle sleeve. The nozzle sleeve includes various nozzles of different specifications, and the nozzles achieve the function of throttling and reducing the pressure of the gas by changing the flow diameter.
[0036] Specifically, the gas injection control valve or gas extraction control valve is an electric ball valve.
[0037] like Figure 1 As shown, an underground gas storage facility includes an injection-production well 6, an injection-production pipeline 7, and the aforementioned injection-production valve assembly skid-mounted; the wellhead of the injection-production well 6 is respectively connected to the gas injection outlet and the gas production inlet via pipelines; one end of the injection-production pipeline 7 is connected to the injection-production interface.
[0038] The underground gas storage facility of this application adopts the above-mentioned skid-mounted injection and production valve group, so that the injection and production well 6 only needs to use a set of shared injection and production pipelines 7 to realize the gas injection and production processes, thereby solving the problem of redundant pressure transmission pipelines of the injection and production well 6 of the underground gas storage facility, achieving the effects of reducing project costs, facilitating operation and management, and ensuring safety and reliability.
[0039] Specifically, the maximum flow rate of injection-production pipeline 7 shall not be less than 20 × 10⁻⁶. 4 m 3 / d, pressure resistance not less than 16Mpa. The diameter of injection and extraction pipeline 7 needs to meet the maximum flow rate of 20×10 4 m 3 The wall thickness must meet the requirement of withstanding a pressure of 16 MPa.
[0040] In some embodiments, during gas injection, high-pressure natural gas from the gathering and injection station enters the injection-production valve assembly skid via the injection-production pipeline 7. The first injection control valve 11 and the second injection control valve 12 are opened, while the first production control valve 23 and the second production control valve 24 are closed. Natural gas sequentially passes through the injection-production interface, the first injection control valve 11, the mixed-phase flow meter 3, the second injection control valve 12, the emergency shut-off valve 4, the check valve 13, and the injection outlet, entering the injection-production well 6 to complete the gas injection.
[0041] In some embodiments, during gas extraction, low-pressure natural gas from injection-production well 6 enters the injection-production valve assembly skid. The first gas extraction control valve 23 and the second gas extraction control valve 24 are opened, while the first gas injection control valve 11 and the second gas injection control valve 12 are closed. Natural gas sequentially passes through the gas extraction inlet, the first throttle valve 21, the second throttle valve 22, the emergency shut-off valve 4, the first gas extraction control valve 23, the mixed-phase flow meter 3, the second gas extraction control valve 24, and the injection-production interface, entering the injection-production pipeline 7 to complete gas extraction. Finally, the natural gas is transported to the gathering and injection station for separation and dehydration treatment before being integrated into the gas transmission network.
[0042] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0045] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A SAGD valve cluster sled, characterized in that, The injection-production valve assembly skid includes: The gas injection pipeline (1) is provided with a gas injection inlet, a gas injection control valve, a check valve (13) and a gas injection outlet connected in sequence. The gas collection pipeline (2) is provided with a gas collection inlet, a throttle valve, a gas collection control valve and a gas collection outlet connected in sequence; The gas injection inlet and the gas production outlet merge to form an injection-production interface.
2. The ICD thief sled of claim 1, wherein, The skid-mounted injection and production valve assembly also includes a mixed-phase flow meter (3) capable of remote online gas-liquid metering without the need for separate gas-liquid separation. The mixed-phase flow meter (3) is connected in series with the gas injection pipeline (1) and the gas production pipeline (2).
3. The SAGD valve cluster sled of claim 2, wherein, The mixed-phase flow meter (3) is a bidirectional gas-liquid flow meter. The gas injection control valve includes a first gas injection control valve (11) and a second gas injection control valve (12) connected in series. The gas sampling control valve includes a first gas sampling control valve (23) and a second gas sampling control valve (24) connected in series. The mixed-phase flow meter (3) is connected in series between the first gas injection control valve (11) and the second gas injection control valve (12), and between the first gas sampling control valve (23) and the second gas sampling control valve (24).
4. The ICD thief sled of claim 1, wherein, The injection and production valve assembly skid also includes an emergency shut-off valve (4) that can automatically shut off the pipeline when the injection pipeline (1) or the production pipeline (2) is overpressurized. The emergency shut-off valve (4) is connected in series between the injection control valve and the check valve (13), and between the throttle valve and the production control valve.
5. The ICD thief sled of claim 1, wherein, The injection and production valve assembly skid also includes an alcohol injection line (5) capable of mixing alcohol liquid into the gas injection line (1) or the gas production line (2), wherein the alcohol injection line (5) is connected in parallel to the gas injection line (1) and the gas production line (2).
6. The ICD thief sled of claim 1, wherein, The throttle valve includes a first throttle valve (21) and a second throttle valve (22) connected in series, capable of performing graded throttling.
7. The skid-mounted injection / production valve assembly according to claim 6, characterized in that, The first throttle valve (21) is an electric angle throttle valve, and the second throttle valve (22) is an air nozzle sleeve.
8. The ICD thief sled of claim 1, wherein, The gas injection control valve or the gas sampling control valve is an electric ball valve.
9. An underground gas storage characterized by, It includes an injection-production well (6), an injection-production pipeline (7), and a skid-mounted injection-production valve assembly according to any one of claims 1 to 8; the wellhead of the injection-production well (6) is respectively connected to the gas injection outlet and the gas production inlet; one end of the injection-production pipeline (7) is connected to the injection-production interface.
10. The underground gas storage reservoir of claim 9, wherein, The maximum flow rate of the injection-production pipeline (7) shall not be less than 20 × 10 4 m 3 / d, with a pressure resistance of not less than 16Mpa.