Pressure relief assembly and oil and gas exploitation equipment

Abstract

The utility model discloses a pressure relief assembly and oil and gas exploitation equipment, and belongs to the technical field of oil and gas exploitation, the pressure relief assembly is used for being installed on a main pipeline, the pressure relief assembly comprises a pressure relief pipeline, the pressure relief pipeline comprises a first valve, a second valve and a first connecting piece, and one end of the first valve is used for being connected with the main pipeline through a connecting joint; the other end of the first valve is connected with one end of the second valve through the first connecting piece, a containing cavity is formed between the first valve and the second valve and used for pre-storing liquid, and the hydraulic pressure in the containing cavity is smaller than the pump injection working pressure of the main pipeline. The pressure relief assembly can solve the problems that due to the fact that a valve installed between a manifold and a conveying manifold is affected by high-pressure liquid at present, the service life is short, leakage is prone to being generated, personal safety of workers is threatened, and large adverse effects can be generated on the production rhythm.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil and gas exploitation, and particularly relates to a pressure relief assembly and an oil and gas exploitation device. BACKGROUND

[0002] In the process of oil and gas exploitation, a manifold is usually used to transport fracturing fluid and the like, and the liquid in the manifold is usually transported at high pressure or even super-high pressure. Accordingly, after the fracturing process is completed or in the case of an unexpected situation, a pressure relief manifold is needed to relieve the pressure of the transport manifold.

[0003] At present, the pressure relief manifold is usually connected with the main pipeline such as the transport manifold by a valve and a connecting joint, and when pressure relief is needed, the valve between the two is opened, so that the liquid in the main pipeline can be discharged through the pressure relief manifold to achieve the purpose of pressure relief.

[0004] As described above, since the liquid pressure in the transport manifold is usually relatively high, the opening speed of the valve is directly related to the service life of the valve. During the opening process of the valve, it needs to withstand a huge pressure and is also eroded by the liquid, which makes the service life of the valve relatively short and prone to leakage. Once the valve leaks, it will pose a threat to the personal safety of the workers and will also have a great adverse impact on the production rhythm. CONTENT OF THE INVENTION

[0005] The purpose of the embodiments of the application is to provide a pressure relief assembly and an oil and gas exploitation device to solve the problem that the valve installed between the manifold and the transport manifold is affected by high-pressure liquid, has a short service life, is prone to leakage, thereby posing a threat to the personal safety of the workers and also having a great adverse impact on the production rhythm.

[0006] In a first aspect, the embodiments of the application disclose a pressure relief assembly for being installed in a main pipeline, which comprises a pressure relief pipeline, the pressure relief pipeline comprising a first valve, a second valve and a first connecting piece, one end of the first valve being connected with the main pipeline through a connecting joint, the other end of the first valve being connected with one end of the second valve through the first connecting piece, a containing cavity being formed between the first valve and the second valve, the containing cavity being used to pre-store liquid, and the hydraulic pressure in the containing cavity being less than the pump injection working pressure of the main pipeline.

[0007] In a second aspect, the embodiments of the application disclose an oil and gas exploitation device, which comprises a main pipeline, a connecting joint and the above-mentioned pressure relief assembly, the pressure relief pipeline being connected with the main pipeline through the connecting joint.

[0008] In a third aspect, the embodiments of the application disclose a control method applied to the above-mentioned pressure relief assembly, characterized in that the control method comprises:

[0009] Before pumping begins on the main pipeline, the first valve is opened and the second valve is closed.

[0010] When the liquid pre-stored in the receiving cavity meets the preset pressure, the first valve is closed, wherein the preset pressure is less than the pumping working pressure of the main pipeline;

[0011] When pressure relief is required, open the first valve and the second valve in sequence.

[0012] This application provides a pressure relief assembly, which includes a pressure relief pipeline that can be installed on a main pipeline via a connecting joint. In the pressure relief pipeline, a first valve is connected to the main pipeline via the connecting joint, and the first valve is connected to a second valve via a first connector, forming a receiving cavity between the first and second valves. During the operation of the pressure relief assembly disclosed in this application, liquid needs to be pre-stored in the receiving cavity to provide a certain hydraulic pressure. When the main pipeline needs to be depressurized, the liquid in the receiving cavity can provide a balancing effect on the first valve, reducing the erosion pressure on the first valve, significantly reducing the wear of the first valve during each pressure relief process, and extending the service life of the first valve. Simultaneously, the liquid in the receiving cavity can also shorten the time of high pressure applied to the second valve during opening, thereby reducing the erosion rate of the second valve, extending its service life, significantly improving the personal safety of well site personnel, and minimizing the adverse impact on production rhythm due to damage to the pressure relief pipeline. Attached Figure Description

[0013] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0014] Figure 1 This is a schematic diagram of the pressure relief assembly disclosed in the embodiments of this application;

[0015] Figure 2 This is a flowchart of the control method for the pressure relief component disclosed in the embodiments of this application.

[0016] Figure label:

[0017] 110 - First valve, 120 - Second valve, 130 - Third valve

[0018] 210 - Throttling nozzle, 220 - Adjustable throttle valve

[0019] 310 - Reducing diameter connector, 320 - Wing nut

[0020] 400-Connector

[0021] 500-Director Road. Detailed Implementation

[0022] 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, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0024] This application discloses a pressure relief component, which is installed on a delivery pipeline as a branch of the delivery pipeline. When the delivery pipeline needs to be depressurized, the pressure relief component is used to discharge liquid to achieve the purpose of depressurization. Of course, a corresponding pipeline structure can also be connected downstream of the pressure relief component to discharge the liquid to a specific area or container.

[0025] like Figure 1 As shown in the embodiment of this application, the pressure relief assembly includes a pressure relief pipeline, which is installed on the main pipeline 500 via a connecting joint 400. The type of connecting joint 400 can be flexibly adjusted according to the actual situation, such as the number of branch pipelines or devices to be connected on the main pipeline 500. When the connecting joint 400 only needs to connect to an external pressure relief pipeline, it can be a tee. More specifically, the connecting joint 400 can be a T-tee, that is, of the three openings of the connecting joint 400, two openings are parallel to each other, and the orientation of the third opening is perpendicular to the distribution direction of the aforementioned two openings.

[0026] More specifically, the pressure relief pipeline includes a first valve 110, a second valve 120, and a first connector. One end of the first valve 110 is connected to the main pipeline 500 via a connector 400, thereby enabling the entire pressure relief assembly to form a controllable on / off relationship with the main pipeline 500. Simultaneously, the first valve 110 is connected to one end of the second valve 120 via the first connector. In the pressure relief assembly disclosed in this application embodiment, the first connector can specifically be an adapter to achieve a change in diameter or shape structure; alternatively, the first connector can also be a bridging component, used only to provide a connection.

[0027] In one specific embodiment of this application, existing equipment can be modified to obtain the pressure relief assembly with the above-described structure disclosed in the embodiments of this application. As mentioned above, in the current equipment, a valve is typically directly connected to the main pipeline 500 via a connecting joint 400 as a pressure relief structure. Therefore, in one specific embodiment of this application, the valve already connected to the connecting joint 400 of the main pipeline 500 in the current equipment can be directly used as the first valve 110. Based on this, since the first valve 110 is an existing structure, it is not necessary to provide a new valve structure as the first valve 110, thereby reducing modification costs. Moreover, the modification process will not hinder the normal operation of the current equipment, thus improving production efficiency.

[0028] Based on the above, since the pipe diameter of the first valve 110 installed in the equipment cannot be changed, the pipe diameter of the valve 110 may be different from that of the second valve 120 in the pressure relief assembly disclosed in this application embodiment. That is, in a specific embodiment of this application, the pipe diameters of the first valve 110 and the second valve 120 are different. In this case, the first connector may include a reducing connector 310, so that the first valve 110 and the second valve 120 can be connected through the reducing connector 310, thereby ensuring that the valves that can still be used normally on the equipment can continue to work.

[0029] In the above embodiments, the valves originally used in the equipment usually have relatively large pipe diameters. Therefore, in order to further reduce the modification cost, the pipe diameter of the second valve 120 can be smaller than that of the first valve 110, which can also reduce the difficulty of opening and closing the second valve 120.

[0030] As mentioned above, valves with relatively smaller pipe diameters are less expensive. Therefore, in newly added pressure relief components, or when the service life of the pressure relief valves originally installed on the equipment is nearing its limit, to reduce the assembly difficulty and spare parts shortage of the pressure relief components, the pipe diameters of the first valve 110 and the second valve 120 can be the same. Of course, the pipe diameters of the two valves can be relatively smaller while meeting the requirements, so that the overall cost of the pressure relief components is relatively low. When the pipe diameters of the first valve 110 and the second valve 120 are the same, the first valve 110 and the second valve 120 can be connected by a nut. More specifically, to further reduce the installation difficulty, the first connecting member can include a wing nut 320, and the first valve 110 and the second valve 120 can be connected by the wing nut 320 to facilitate tightening during installation.

[0031] Of course, the main pipeline 500 and the connecting joint 400, as well as the connecting joint 400 and the first valve 110, also need to be connected to each other using corresponding connectors. Typically, the main pipeline 500 and the connecting joint 400 can be connected by a wing nut 320, and the connecting joint 400 and the first valve 110 can also be connected by a wing nut 320.

[0032] As described above, in the pressure relief assembly disclosed in this application embodiment, a second valve 120 is installed downstream of the first valve 110 via a first connector. Based on this, the first valve 110 and the second valve 120 have the ability to store liquid. Furthermore, in order to further reduce the degree and rate of erosion of the first valve 110 and the second valve 120 by the high-pressure liquid during the pressure relief process, in this application embodiment, a receiving cavity is formed between the first valve 110 and the second valve 120, and the receiving cavity is used to pre-store liquid.

[0033] In other words, during the use of the pressure relief assembly disclosed in this application embodiment, liquid needs to be pre-stored in the receiving cavity of the pressure relief assembly before the main pipeline 500 begins pumping, and the receiving cavity needs to be filled with liquid. That is, before the main pipeline 500 begins pumping, the first valve 110 needs to be opened and the second valve 120 needs to be kept closed to inject liquid at a certain pressure into the receiving cavity. Typically, the liquid in the receiving cavity needs to have a certain pressure; specifically, the hydraulic pressure in the receiving cavity usually needs to reach the MPa level. Of course, the hydraulic pressure in the receiving cavity also needs to be less than the pumping working pressure of the main pipeline 500 to reduce the pressure continuously received by the first valve 110 and the second valve 120.

[0034] When the above technical solution is adopted, since the cavity between the first valve 110 and the second valve 120 is pre-stored with liquid at a certain pressure, when the main pipeline 500 needs to be depressurized, the liquid in the cavity can balance the pressure applied by the main pipeline 500, reduce the pressure on the first valve 110 during the depressurization process, and increase the service life of the first valve 110. At the same time, during the opening of the second valve 120, the liquid in the cavity can also provide a buffering effect for the second valve 120, delaying the time when the high-pressure liquid in the main pipeline 500 acts on the second valve 120, thereby reducing the duration of the second valve 120 bearing the pumping pressure, and extending the service life of the second valve 120 to a certain extent. With the reduced probability of leakage in the first valve 110 and the second valve 120, the degree of threat to the personal safety of the personnel can be greatly reduced, and the well site work can be prevented from being affected by the failure of the pressure relief valve, ensuring that production can proceed normally.

[0035] In one specific embodiment of this application, both the first valve 110 and the second valve 120 can be gate valves. In another embodiment, both the first valve 110 and the second valve 120 are plug valves. This improves the smoothness of opening and closing of the first valve 110 and the second valve 120, preventing the large shear force generated by the high-pressure liquid on the valves from significantly hindering the opening and closing process. Furthermore, the plug valves open and close relatively quickly, thereby reducing the time the high-pressure liquid acts on the first valve 110 and the second valve 120, and extending their service life.

[0036] This application provides a pressure relief assembly, which includes a pressure relief pipeline, and the pressure relief pipeline can be installed on the main pipeline 500 via a connecting joint 400. In the pressure relief pipeline, a first valve 110 is connected to the main pipeline 500 via the connecting joint 400, and the first valve 110 is connected to a second valve 120 via a first connector, so that a receiving cavity can be formed between the first valve 110 and the second valve 120. Meanwhile, during the operation of the pressure relief assembly disclosed in this application embodiment, liquid needs to be pre-stored in the receiving cavity to ensure a certain hydraulic pressure. When the main pipeline 500 needs to be depressurized, the liquid in the receiving cavity can provide a balancing effect for the first valve 110, reducing the erosion pressure on the first valve 110, significantly reducing the wear of the first valve 110 during each pressure relief process, and extending the service life of the first valve 110. At the same time, the liquid in the receiving cavity can also shorten the time of high pressure on the second valve 120 during the opening process, thereby reducing the erosion rate of the second valve 120, extending the service life of the second valve 120, significantly improving the personal safety of the well site personnel, and minimizing the adverse impact on the production rhythm caused by damage to the pressure relief pipeline.

[0037] As described above, when pressure relief is required, the first valve 110 must be opened first, followed by the second valve 120. Since opening the second valve 120 also takes time, the pressure upstream of the second valve 120 gradually increases due to the influence of the liquid in the main pipeline 500, eventually reaching the pumping operating pressure of the main pipeline 500. This causes the second valve 120 to be subjected to high pressure erosion in a short period. Therefore, although the service life of the first valve 110 and the second valve 120 in the pressure relief assembly disclosed in this application embodiment is significantly increased compared to the service life of current pressure relief valves, As the pressure relief assembly is used for longer periods and the number of pressure relief cycles increases, the second valve 120 may leak. Therefore, to prevent leakage from the second valve 120 from hindering the production process, the pressure relief assembly disclosed in this application includes a third valve 130 in the pressure relief pipeline. The third valve 130 is connected to the end of the second valve 120 away from the first connector; that is, the third valve 130 is located downstream of the second valve 120. Similarly, the diameter of the third valve 130 can be the same as that of the second valve 120 to reduce the difficulty of obtaining spare parts and to simplify the connection between the second valve 120 and the third valve 130. As mentioned above, both the first valve 110 and the second valve 120 can be plug valves. Similarly, to improve the opening and closing efficiency of the third valve 130 and reduce the time the high-pressure liquid acts on the third valve 130, the third valve 130 can also be a plug valve.

[0038] Furthermore, during the use of the pressure relief assembly disclosed in this application embodiment, if the second valve 120 does not malfunction, that is, if the second valve 120 can be reliably opened and closed, then before the main pipeline 500 starts pumping, K can still use the receiving cavity between the first valve 110 and the second valve 120 to pre-store liquid. When pressure relief is required, the third valve 130 is opened first to ensure that the downstream of the second valve 120 is unobstructed. Then, the first valve 110 is opened to balance the pressure upstream and downstream of the first valve 110. Finally, the second valve 120 is opened to complete the pressure relief work.

[0039] If the second valve 120 malfunctions, i.e., if the second valve 120 leaks, the third valve 130 can be used as a backup sealing device to ensure that the pressure relief assembly, the main pipeline 500, and the entire oil and gas extraction equipment can continue to work normally for a period of time. Therefore, it is not necessary to immediately stop work and production when the second valve 120 malfunctions, so as to ensure the personal safety of the staff.

[0040] In detail, if the second valve 120 malfunctions and fails to provide a proper seal, the sealing of the cavity between the first valve 110 and the second valve 120 will fail. In this case, if pumping is still required, the cavity between the third valve 130 and the first valve 110 can be used for liquid pre-storage. Specifically, a backup cavity is formed between the first valve 110 and the third valve 130. When the second valve 120 malfunctions and pumping is still required, the backup cavity is used to pre-storage liquid, and the hydraulic pressure in the backup cavity is less than the pumping pressure of the main pipeline 500.

[0041] Of course, the pre-stored hydraulic pressure in the backup containment chamber is basically equivalent to the pre-stored hydraulic pressure in the containment chamber. In one specific embodiment of this application, the hydraulic pressure in the containment chamber can be half of the pumping working pressure in the main pipeline 500. To further reduce the erosion of the first valve 110 by the high-pressure liquid in the main pipeline 500, in another embodiment of this application, the hydraulic pressure in the containment chamber can be 60% to 90% of the pumping working pressure of the main pipeline 500. More specifically, in oil and gas extraction equipment, the pumping working pressure in the main pipeline 500 is usually around 120 MPa. In this case, the pre-stored hydraulic pressure in the containment chamber can be between 90 and 100 MPa. Similarly, when the second valve 120 is abnormal, and liquid is pre-stored using the backup containment chamber, the pre-stored hydraulic pressure in the backup containment chamber can also be between 90 and 100 MPa. More specifically, the pre-stored pressure in the containment chamber and the backup containment chamber can be 20 to 30 MPa lower than the pumping working pressure.

[0042] As described above, if the second valve 120 malfunctions, preventing the containment chamber from forming a proper seal, and pumping is still required, a backup containment chamber formed between the third valve 130 and the first valve 110 can be used for pre-storing liquid. This prevents immediate shutdown in the event of a leak in the second valve 120. However, in actual production, if the second valve 120 malfunctions, shutdown can be flexibly controlled based on the on-site situation. If the shutdown has minimal or no impact on the production rhythm, it can be stopped quickly, and a new second valve 120 replaced. Conversely, if the shutdown has a significant negative impact on the production rhythm, the third valve 130 can be used as a backup, allowing the pressure relief assembly to continue operating. Furthermore, if the third valve 130 is used as a backup to complete the pressure relief work after the second valve 120 malfunctions, a new second valve 120 should be replaced as soon as possible. This restores the safety performance of the pressure relief assembly and prevents further leakage from the third valve 130, which could threaten the safety of on-site personnel.

[0043] Optionally, the pressure relief assembly disclosed in this application also includes a throttling element, which is connected to the end of the second valve 120 opposite to the first valve 110. More specifically, when the pressure relief pipeline includes a third valve 130, the throttling element is installed at the end of the third valve 130 opposite to the second valve 120. In short, the throttling element is installed at the end of each pressure relief pipeline to control the pressure relief flow rate. Specifically, the cross-sectional area of ​​the throttling element is a fixed value, that is, the throttling element is a throttling nozzle 210. During the application of the pressure relief assembly, the inner diameter and other parameters of the throttling nozzle 210 can be flexibly determined according to the pumping pressure and other parameters on site. Alternatively, to improve the flexibility of the pressure relief process, in another embodiment of this application, the throttling element can also be a throttling valve, the diameter of which can be adjusted, thereby flexibly adjusting the pressure relief rate according to the actual working conditions.

[0044] To further enhance the operational flexibility of the pressure relief assembly, in one specific embodiment of this application, multiple pressure relief pipelines can be used, each installed on the main pipeline 500 via a corresponding connecting joint 400. More specifically, the main pipeline 500 may include a first pipe section and a second pipe section, which are interconnected via multiple connecting joints 400. Each connecting joint 400 is correspondingly connected to a pressure relief pipeline. Specifically, one end of the multiple connecting joints 400 is connected to the first pipe section, and the other end is connected to the second pipe section. Any two adjacent connecting joints 400 are interconnected, or a relatively short pipe section may be additionally provided between any two adjacent connecting joints 400. When the first valve 110 in each pressure relief pipeline is closed, the first and second pipe sections can be normally connected, completing the liquid transport process. Accordingly, when the first valve 110 on any pressure relief pipeline is in the open state, and the second valve 120 (and the third valve 130) on the pressure relief pipeline are both in the open state, the pressure relief pipeline can provide pressure relief, so that the liquid remaining in the main pipeline 500 can be discharged through the pressure relief pipeline.

[0045] When using the technical solution disclosed in the embodiments of this application, the number of pressure relief pipelines to be opened can be flexibly selected according to the actual situation. For example, when it is necessary to relieve pressure as soon as possible, a relatively large number of pressure relief pipelines can be opened so that the liquid in the main pipeline 500 can be discharged through multiple pressure relief pipelines at the same time. Correspondingly, when the pumping pressure of the main pipeline 500 is relatively low, only the first valve 110 on one pressure relief pipeline can be opened to use one pressure relief pipeline for pressure relief.

[0046] In cases where the pressure relief assembly includes multiple pressure relief lines, at least one of the pressure relief lines may have a throttling device 210, and at least one other pressure relief line may have a throttling device 220. In this case, the pressure relief flexibility of the entire pressure relief assembly is relatively higher.

[0047] Based on the pressure relief components disclosed in any of the above embodiments of this application, this application also discloses an oil and gas extraction device, which includes a main pipeline 500, a connecting joint 400 and any of the above pressure relief components, wherein the pressure relief pipeline in the pressure relief component is connected to the main pipeline 500 through the connecting joint 400.

[0048] Based on the pressure relief component disclosed in any of the above embodiments of this application, this application also discloses a control method applied to the above-mentioned pressure relief component, such as... Figure 2 As shown, the control method disclosed in this application includes:

[0049] S1. Before pumping in the main pipeline 500, open the first valve 110 and close the second valve 120.

[0050] S2. When the liquid pre-stored in the containment cavity meets the preset pressure, close the first valve 110, wherein the preset pressure is less than the pumping working pressure of the main pipeline 500.

[0051] S3. When pressure relief is required, open the first valve 110 and the second valve 120 in sequence.

[0052] As described above, the control method disclosed in this application is applied to the aforementioned pressure relief assembly. The pressure relief pipeline in the assembly is connected to the main pipeline 500 via a connecting joint 400. Before pumping, a pre-stored liquid pressure is placed in the accommodating cavity between the first valve 110 and the second valve 120 in the pressure relief pipeline. This allows the pre-stored liquid in the accommodating cavity to balance the high pressure upstream of the first valve 110 during pressure relief operations, reducing the erosion of the first valve 110 by the high-pressure liquid and increasing its service life. Furthermore, the liquid in the accommodating cavity between the first valve 110 and the second valve 120 also delays the time when the high-pressure liquid in the main pipeline 500 acts on the second valve 120, reducing the duration of the high-pressure liquid's action on the second valve 120 and thus extending its service life. Additionally, the pre-stored pressure can be 60% to 90% of the pumping pressure in the main pipeline 500. More specifically, the difference between the pumping pressure of the main pipeline 500 and the pre-stored pressure can be between 20 and 30 MPa.

[0053] In the above embodiments, the pressure relief assembly may further include a third valve 130, and the third valve 130 is connected to the end of the second valve 120 away from the first connector. In this case, in the control method disclosed in this application embodiment, when pressure relief is required, the third valve 130, the first valve 110 and the second valve 120 are opened in sequence to ensure that the pressure relief work can be carried out normally.

[0054] Based on the above embodiments, when the pressure relief assembly includes a third valve 130, as the working time of the pressure relief assembly increases, the second valve 120 may also be at risk of leakage or other abnormalities. Therefore, in the above embodiments of this application, by adding a third valve 130 downstream of the second valve 120, the third valve 130 can be used as a backup sealing device to ensure that the pressure relief assembly can still be properly sealed when the second valve 120 leaks. Thus, when the second valve 120 leaks, it is not necessary to immediately stop production and a high level of safety can still be ensured on site.

[0055] Furthermore, in the control method, if an abnormal situation such as leakage occurs in the second valve 120, causing the sealing of the receiving cavity to fail, and pumping is still required, before pumping is performed in the main pipeline 500, the first valve 110 and the second valve 120 can be opened first, and the third valve 130 can be closed, so as to pre-store liquid in the spare receiving cavity between the first valve 110 and the third valve 130. The pressure of the pre-stored liquid in the spare receiving cavity is the preset pressure.

[0056] Accordingly, when the liquid pre-stored in the backup containment chamber meets the preset pressure, the first valve 110 is closed. If pressure relief is required, the first valve 110 and the third valve 130 are opened sequentially, thus completing the pressure relief operation even if the second valve 120 malfunctions. Of course, after using the third valve 130 for pressure relief, the second valve 120 needs to be replaced promptly to restore the safety of the pressure relief assembly during subsequent use.

[0057] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0058] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A pressure relief assembly for mounting to a main line (500), characterized by, The pressure relief assembly comprises a pressure relief pipeline, the pressure relief pipeline comprises a first valve (110), a second valve (120) and a first connecting piece, one end of the first valve (110) is connected with the main pipeline (500) through a connecting joint (400), the other end of the first valve (110) is connected with one end of the second valve (120) through the first connecting piece, a containing cavity is formed between the first valve (110) and the second valve (120), the containing cavity is used for pre-storing liquid, and the hydraulic pressure in the containing cavity is less than the pump injection working pressure of the main pipeline (500).

2. The pressure relief assembly of claim 1, wherein, The pressure relief pipeline further comprises a third valve (130), the third valve (130) is connected to the end of the second valve (120) away from the first connecting piece, in the case that the second valve (120) is abnormal, the containing cavity fails to seal, and the pump injection work still needs to be carried out, a standby containing cavity is formed between the first valve (110) and the third valve (130), the standby containing cavity is used for pre-storing liquid, and the hydraulic pressure in the standby containing cavity is less than the pump injection working pressure of the main pipeline (500).

3. The pressure relief assembly of claim 2, wherein, The third valve (130) is a plug valve.

4. The pressure relief assembly of claim 1, wherein, The pressure relief pipeline further comprises a throttling piece, the throttling piece is connected to the end of the second valve (120) away from the first valve (110).

5. The pressure relief assembly of claim 4, wherein, The number of the pressure relief pipelines is multiple, and each of the pressure relief pipelines is used to be installed in the main pipeline (500) through the corresponding connecting joint (400).

6. The pressure relief assembly of claim 5, wherein, Among the multiple pressure relief pipelines, the throttling piece of at least one of the pressure relief pipelines is a throttling nozzle (210), and the throttling piece of at least one other of the pressure relief pipelines is an adjustable throttling valve (220).

7. The pressure relief assembly of claim 1, wherein, The hydraulic pressure in the containing cavity is 60% to 90% of the pump injection working pressure of the main pipeline (500).

8. The pressure relief assembly of claim 1, wherein, The first valve (110) and the second valve (120) are both plug valves.

9. The pressure relief assembly of claim 1, wherein, The pipe diameters of the first valve (110) and the second valve (120) are different, the first connecting piece comprises a variable-diameter connecting piece (310), and the first valve (110) and the second valve (120) are connected through the variable-diameter connecting piece (310); Alternatively, the pipe diameters of the first valve (110) and the second valve (120) are the same, the first connecting piece comprises a wing-shaped nut (320), and the first valve (110) and the second valve (120) are connected through the wing-shaped nut.

10. An oil and gas production apparatus, characterized in that, The pressure relief assembly comprises a main pipeline (500), a connecting joint (400) and the pressure relief assembly according to any one of claims 1-9, and the pressure relief pipeline is connected with the main pipeline (500) through the connecting joint (400).

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