A safety valve for oilfield completion

Abstract

This utility model provides a safety valve for oilfield well completion, relating to the field of safety valve technology. It includes a valve body, a lower inner sleeve, and a side inner sleeve. The lower part of the valve body has a lower interface, and the lower inner sleeve is installed inside the lower interface. The right side of the valve body has a side interface, and the side inner sleeve is installed inside the side interface. The upper end of the valve body is covered by an upper cover plate, and an upper housing is fixed to the upper end of the upper cover plate. An upper fixing sleeve is provided at the upper end of the upper housing. A push rod is fitted in the center of the upper housing, and a lower pressure plate is fixed to the lower end of the push rod. The lower end of the lower pressure plate is inserted into a lower pressure column. Multiple sets of fastening bolts are installed between the upper cover plate and the upper part of the valve body, and the lower pressure column is located in the center of the valve body. This utility model features a tight connection between the inlet and outlet interfaces, facilitating disassembly and replacement, making it more convenient and labor-saving. Furthermore, the internal structure safely moves upwards when subjected to pressure exceeding a set value, ensuring a tight seal during the upward movement to prevent leakage, making it safer, tighter, and more reliable.

Description

Technical Field

[0001] This utility model relates to the field of safety valve technology, specifically to a safety valve used for oilfield well completion. Background Technology

[0002] With the advancement of science and technology, social changes, and technological innovation, my country's oil extraction engineering has developed significantly. Currently, domestic oil extraction is mainly based on onshore oil wells. However, oil extracted from offshore platforms is gradually accounting for a larger proportion. Due to the complex geological conditions in my country, many technical problems have not been well resolved. At present, whether drilling in onshore or offshore oil fields, during well completion operations, if the downhole pressure is too high when an emergency pump is stopped, a blowout or spontaneous overflow may occur at any time. To prevent such accidents, the state has stipulated that all oil wells with spontaneous flow or overflow capabilities must be equipped with downhole safety valves during well completion operations.

[0003] The specification of a safety valve for well completion in the prior art (publication number CN212743956U) mentions "lower connector, valve plate, hinge shaft, intermediate connector, plunger, central tube, upper connector, outer spring, inner spring, valve plate fixing sleeve, and torsion spring; characterized in that: the safety valve for well completion is a cylinder with a central hole, the central tube is inserted into the central hole of the upper connector, the central tube with the inner spring passes through the central hole of the intermediate connector, the plunger in the cylinder of the intermediate connector is fitted with an outer spring, the lower part of the upper connector and the upper part of the intermediate connector are connected by threads, the valve plate fixing sleeve is fitted on the central tube and located above the inner spring, the valve plate fixing sleeve is fitted on the lower part of the valve plate intermediate connector and the upper part of the lower connector are connected by threads." However, the inlet and outlet connections of the safety valve in the prior art are not tight, which is prone to leakage, and the internal structures are not airtight, which may lead to leakage at unexpected locations, making it unsafe and impractical. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, a safety valve for oilfield well completion is provided to solve the problems of existing safety valves having loose inlet and outlet connections that are prone to leakage, and internal structures that are not airtight, which may lead to leakage at unexpected locations, making them unsafe and impractical.

[0005] To achieve the above objectives, a safety valve for oilfield well completion is provided, comprising a valve body, a lower inner sleeve, and a side inner sleeve. The lower part of the valve body is provided with a lower interface, and the lower inner sleeve is installed inside the lower interface. The right side of the valve body is provided with a side interface, and the side inner sleeve is installed inside the side interface. The upper end of the valve body is covered with an upper cover plate, and an upper cover is fixed to the upper end of the upper cover plate. An upper fixing sleeve is provided at the upper end of the upper cover. A push rod is sleeved in the center of the upper cover, and a lower pressure plate is fixed to the lower end of the push rod. The lower end of the lower pressure plate is inserted into the lower pressure column.

[0006] Furthermore, multiple sets of fastening bolts are installed between the upper cover plate and the upper part of the valve body, and the lower pressure column is located in the center of the valve body, with the lower end of the lower pressure column pressing against the inner port of the lower interface.

[0007] Furthermore, the lower inner sleeve has a first connecting thread on its outer annular surface and a first through hole inside, and the lower inner sleeve is detachably connected to the lower interface.

[0008] Furthermore, the inner sleeve has a second through hole, and the outer circumferential surface of the inner sleeve is provided with a second connecting thread, and the inner sleeve is a detachable structure.

[0009] Furthermore, a lower sleeve hole is provided in the lower part of the valve body, and a lower sealing ring is embedded in the lower sleeve hole. A first sleeve hole is provided in the lower sealing ring, and the lower sealing ring is made of rubber.

[0010] Furthermore, an upper sealing ring is fitted between the upper cover plate and the upper part of the valve body, and an upper recess is opened at the upper part of the upper sealing ring. The lower pressure plate is pressed into the upper recess, and a lower recess is opened at the lower part of the push rod. The upper part of the lower pressure column is fitted into the lower recess, and the upper sealing ring is made of rubber.

[0011] Furthermore, an upper pressure plate is fitted over the middle of the top rod, and a spring is fitted over the lower part of the top rod. The upper end of the spring rests against the upper pressure plate, and the lower end of the spring rests against the lower pressure plate. A pull sleeve is fitted over the upper part of the top rod, and the upper end of the top rod is fixed under the top cover.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. In this utility model, the lower inner sleeve and the lower interface, and the side inner sleeve and the side interface are all installed by threaded engagement, which not only facilitates assembly, disassembly, cleaning, and replacement, but also makes pressure relief safer, more stable, and more reliable.

[0014] 2. The lower sealing ring in this utility model not only ensures a tight connection between the lower pressure column and the lower inner sleeve before the lower pressure column is removed, preventing leakage; at the same time, the upper sealing ring is designed to ensure the tightness between the lower pressure column and the lower pressure plate, so as to ensure greater safety and tightness before pressure relief is required.

[0015] 3. In this utility model, the lower end of the lower pressure plate fixed to the lower part of the top rod is inserted into the upper part of the lower pressure column, and the centers of the upper cover, the top rod and the lower interface are all located on the same axis, so that the lower pressure column, the upper sealing ring and the lower pressure plate can move up and down accurately and stably under high pressure, which is safe and reliable. Attached Figure Description

[0016] Figure 1 This is a front view schematic diagram of an embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of the lower inner sleeve according to an embodiment of the present utility model;

[0018] Figure 3 This is a schematic diagram of the lower sealing ring according to an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the inner sleeve of an embodiment of the present utility model;

[0020] Figure 5 This is a schematic diagram of the upper sealing ring in an embodiment of the present invention.

[0021] In the diagram: 1. Valve body; 10. Lower interface; 11. Top cover; 12. Upper fixing sleeve; 13. Lower sleeve hole; 14. Lower pressure column; 15. Side interface; 16. Upper cover plate; 17. Fastening bolt; 18. Upper cover; 2. Lower inner sleeve; 20. First through hole; 21. First connecting thread; 3. Lower sealing ring; 30. First sleeve hole; 4. Side inner sleeve; 40. Second through hole; 41. Second connecting thread; 5. Push rod; 50. Upper pressure plate; 51. Spring; 52. Lower pressure plate; 53. Pull sleeve; 6. Upper sealing ring; 60. Upper notch; 61. Lower notch. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Specific details, such as particular system structures and technologies, are provided to facilitate a more thorough understanding of the embodiments of the present utility model. The described embodiments are some, but not all, of the embodiments disclosed herein. However, those skilled in the art should understand that the present utility model can also be implemented in other embodiments without these specific details. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0023] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0024] Figure 1 This is a front view schematic diagram of an embodiment of the present utility model. Figure 2 This is a schematic diagram of the lower inner sleeve according to an embodiment of the present utility model. Figure 3 This is a schematic diagram of the lower sealing ring according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the inner sleeve of an embodiment of the present utility model. Figure 5 This is a schematic diagram of the upper sealing ring in an embodiment of the present invention.

[0025] Reference Figures 1 to 5As shown, this utility model provides a safety valve for oilfield well completion, including a valve body 1, a lower inner sleeve 2 and a side inner sleeve 4. The lower part of the valve body 1 is provided with a lower interface 10, and the lower inner sleeve 2 is installed in the lower interface 10. The right part of the valve body 1 is provided with a side interface 15, and the side inner sleeve 4 is installed in the side interface 15. The upper end of the valve body 1 is covered with an upper cover plate 16, and the upper end of the upper cover plate 16 is fixed with an upper cover shell 18. The upper end of the upper cover shell 18 is provided with an upper fixing sleeve 12. A top rod 5 is sleeved in the center of the upper cover shell 18, and the lower end of the top rod 5 is fixed with a lower pressure plate 52. The lower end of the lower pressure plate 52 is inserted into the lower pressure column 14.

[0026] In this embodiment, multiple sets of fastening bolts 17 are installed between the upper cover plate 16 and the upper part of the valve body 1, and the lower pressure column 14 is located in the center of the valve body 1, and the lower end of the lower pressure column 14 is pressed against the inner port of the lower interface 10; the outer ring surface of the lower inner sleeve 2 is provided with a first connecting thread 21, and the lower inner sleeve 2 is provided with a first through hole 20, and the lower inner sleeve 2 and the lower interface 10 are detachably connected; the side inner sleeve 4 is provided with a second through hole 40, and the outer ring surface of the side inner sleeve 4 is provided with a second connecting thread 41, and the side inner sleeve 4 is a detachable structure.

[0027] As a preferred embodiment, the lower inner sleeve 2 and the lower interface 10, and the side inner sleeve 4 and the side interface 15 are all connected by threaded engagement in this utility model, which not only facilitates assembly, disassembly, cleaning, and replacement, but also makes pressure relief safer, more stable, and more reliable.

[0028] In this embodiment, a lower sleeve hole 13 is provided in the lower part of the valve body 1, and a lower sealing ring 3 is embedded in the lower sleeve hole 13. The lower sealing ring 3 is made of rubber. An upper sealing ring 6 is sleeved between the upper cover plate 16 and the upper part of the valve body 1. An upper recess 60 is provided in the upper part of the upper sealing ring 6. The lower pressure plate 52 is pressed into the upper recess 60. A lower recess 61 is provided in the lower part of the push rod 5. The upper part of the lower pressure column 14 is sleeved into the lower recess 61. The upper sealing ring 6 is made of rubber.

[0029] As a preferred embodiment, the lower sealing ring 3 in this utility model not only ensures a tight connection between the lower pressure column 14 and the lower inner sleeve 2 before the lower pressure column 14 is removed, preventing leakage; at the same time, the upper sealing ring 6 is provided to ensure the tightness between the lower pressure column 14 and the lower pressure plate 52, so as to ensure greater safety and tightness before pressure relief is required.

[0030] In this embodiment, an upper pressure plate 50 is sleeved in the middle of the push rod 5, and a spring 51 is sleeved in the lower part of the push rod 5. The upper end of the spring 51 rests on the upper pressure plate 50, and the lower end of the spring 51 rests on the lower pressure plate 52. A pull sleeve 53 is sleeved in the upper part of the push rod 5, and the upper end of the push rod 5 is fixed under the top cover 11.

[0031] In a preferred embodiment, the lower end of the lower pressure plate 52, which is fixed to the lower part of the top rod 5, is inserted into the upper part of the lower pressure column 14. Furthermore, the centers of the upper cover 18, the top rod 5, and the lower interface 10 are all located on the same axis, which ensures that the lower pressure column 14, the upper sealing ring 6, and the lower pressure plate 52 move accurately and stably up and down under high pressure, making them safe and reliable.

[0032] This invention effectively solves the problems of existing safety valves where the inlet and outlet connections are not tight, leading to easy leakage, and the internal structures are not airtight, potentially causing leakage at unexpected locations, making them unsafe and impractical. This invention features tight inlet and outlet connections, facilitating disassembly and replacement, making it more convenient and hassle-free. Furthermore, the internal structure safely moves upwards when subjected to pressure exceeding the set value, ensuring airtightness during the upward movement to prevent leakage, making it safer, tighter, and more reliable.

[0033] The above embodiments are used to explain and illustrate the present utility model, and not to limit the utility model. Any modifications and changes made to the present utility model within the spirit and scope of the claims should be included within the protection scope of the present utility model.

Claims

1. A safety valve for oilfield well completion, characterized in that: The valve body (1) includes a lower inner sleeve (2) and a side inner sleeve (4). The lower part of the valve body (1) is provided with a lower interface (10), and the lower inner sleeve (2) is installed in the lower interface (10). The right side of the valve body (1) is provided with a side interface (15), and the side inner sleeve (4) is installed in the side interface (15). The upper end of the valve body (1) is covered with an upper cover plate (16), and the upper end of the upper cover plate (16) is fixed with an upper cover shell (18). The upper end of the upper cover shell (18) is provided with an upper fixing sleeve (12). A top rod (5) is sleeved in the center of the upper cover shell (18), and the lower end of the top rod (5) is fixed with a lower pressure plate (52). The lower end of the lower pressure plate (52) is inserted into the lower pressure column (14).

2. A safety valve for oilfield well completion according to claim 1, characterized in that, Multiple sets of fastening bolts (17) are installed between the upper cover plate (16) and the upper part of the valve body (1), and the lower pressure column (14) is located in the center of the valve body (1), and the lower end of the lower pressure column (14) is pressed against the inner port of the lower interface (10).

3. A safety valve for oilfield well completion according to claim 1, characterized in that, The lower inner sleeve (2) has a first connecting thread (21) on its outer ring surface, and a first through hole (20) is provided inside the lower inner sleeve (2). The lower inner sleeve (2) and the lower interface (10) are connected separately.

4. A safety valve for oilfield well completion according to claim 1, characterized in that, The inner sleeve (4) has a second through hole (40) and a second connecting thread (41) on its outer ring surface. The inner sleeve (4) is a detachable structure.

5. A safety valve for oilfield well completion according to claim 1, characterized in that, The valve body (1) has a lower sleeve hole (13) in the lower part, and a lower sealing ring (3) is fitted in the lower sleeve hole (13). The lower sealing ring (3) has a first sleeve hole (30) in the lower sealing ring (3), and the lower sealing ring (3) is made of rubber.

6. A safety valve for oilfield well completion according to claim 1, characterized in that, An upper sealing ring (6) is fitted between the upper cover plate (16) and the upper part of the valve body (1), and an upper recess (60) is opened on the upper part of the upper sealing ring (6). The lower pressure plate (52) is pressed into the upper recess (60), and a lower recess (61) is opened on the lower part of the push rod (5). The upper part of the lower pressure column (14) is fitted into the lower recess (61), and the upper sealing ring (6) is made of rubber.

7. A safety valve for oilfield well completion according to claim 1, characterized in that, The top rod (5) is fitted with an upper pressure plate (50) in the middle, and a spring (51) is fitted on the lower part of the top rod (5). The upper end of the spring (51) rests on the upper pressure plate (50), and the lower end of the spring (51) rests on the lower pressure plate (52). A pull sleeve (53) is fitted on the upper part of the top rod (5), and the upper end of the top rod (5) is fixed under the top cover (11).

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