Wellhead anti-falling device for oil exploitation

Abstract

The utility model relates to the technical field of petroleum drilling engineering, and discloses a wellhead anti-falling device for petroleum exploitation, which comprises a shell, a cavity is formed in the shell, a positioning sliding rod is fixedly connected to the inner wall of the cavity, a positioning sliding sleeve is slidably connected to the outside of the positioning sliding rod, and the positioning sliding sleeve is fixedly connected to the inner wall of the cavity. A first wedge block is fixedly connected to the bottom of the positioning sliding sleeve, a protective cover plate is connected to the top of the shell in an inserted mode, a second wedge block is movably connected to the interior of the cavity, balls are embedded in the bottom of the second wedge block, a fastening ring is connected to the exterior of the shell in a threaded mode, and a limiting assembly is arranged at the bottom of the fastening ring. According to the wellhead falling object preventing device for oil exploitation, by arranging a quick release structure, the protective cover plate can be conveniently taken down, constructors can conveniently conduct testing and other operations, and the wellhead falling object preventing device has the advantages of effectively preventing objects from falling from a wellhead and being high in sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling engineering technology, specifically to a wellhead anti-falling object device for oil drilling. Background Technology

[0002] A well is a hole drilled using drilling methods. Generally, after drilling to the oil layer, an oil layer casing is run into an oil well, and oil well cement is injected into the annular space between the casing and the well wall to maintain the well wall and seal the oil, gas and water layers. Then, according to the requirements of oilfield development, the oil layer is perforated with a perforating gun to form a channel, and an oil tubing is run into it. Using appropriate flow induction methods, the oil is raised from the bottom of the oil well to the wellhead.

[0003] Currently, when objects fall into the wellhead during oil drilling, it can cause stuck drill bits and damage to downhole instruments and equipment. Therefore, wellhead covers and other protective devices are usually installed at the wellhead to prevent objects from falling into the well. However, existing wellhead anti-falling-object covers are mostly installed using multiple bolts, which results in low installation and disassembly efficiency and poor sealing, causing inconvenience for subsequent well cleaning and maintenance work. Therefore, there is an urgent need for an oil drilling wellhead anti-falling-object device to solve the above problems. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a wellhead anti-falling object device for oil drilling, which has the advantages of high sealing performance and effectively preventing objects from falling into the wellhead. It solves the problems of existing wellhead anti-falling object covers, which are mostly installed by fixing with multiple bolts, resulting in low installation and disassembly efficiency and poor sealing performance.

[0006] (II) Technical Solution

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A wellhead anti-falling object device for oil exploration includes a housing, an internal cavity of the housing, a positioning slide rod fixedly connected to the inner wall of the cavity, a positioning sleeve slidably connected to the outside of the positioning slide rod, a first wedge block fixedly connected to the bottom of the positioning sleeve, a protective cover plate inserted into the top of the housing, a second wedge block movably connected inside the cavity, a ball embedded in the bottom of the second wedge block, a fastening ring threadedly connected to the outside of the housing, and a limit component provided at the bottom of the fastening ring.

[0008] The beneficial effects of this utility model are:

[0009] This oil wellhead protection device, with its quick-release structure, allows for easy removal of the protective cover, facilitating testing and other operations by construction personnel. It effectively prevents objects from falling into the wellhead and offers high sealing performance.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, a sealing gasket is fixedly connected to the top of the housing, and a sealing groove adapted to the sealing gasket is opened inside the protective cover.

[0012] The beneficial effect of adopting the above-mentioned further solution is that the sealing performance of the device is enhanced by the cooperation of the sealing gasket and the sealing groove.

[0013] Furthermore, a return spring is sleeved on the outside of the positioning slide rod, and there are two positioning slide rods inside the positioning sleeve.

[0014] The advantage of adopting the above-mentioned further solution is that the return spring can provide a stable return force, ensuring that the positioning sleeve can automatically return to the initial position, making it easy to remove the protective cover.

[0015] Furthermore, the protective cover plate has a fixing groove inside, the end of the second wedge block away from the ball is in contact with the inclined surface of the first wedge block, and the end of the first wedge block away from the second wedge block is in contact with the inclined surface of the fixing groove.

[0016] The beneficial effect of adopting the above-mentioned further solution is that the protective cover plate is tightly fitted to the shell by the contact between the first wedge block and the inclined surface of the fixing groove, thus ensuring the sealing performance.

[0017] Furthermore, the limiting component includes a limiting shell fixedly connected to the bottom of the fastening ring, a limiting rod slidably connected inside the limiting shell, a limiting groove being formed inside the shell, and the limiting rod being inserted into the limiting groove.

[0018] The beneficial effect of adopting the above-mentioned further solution is that the limiting component can effectively limit the position of the fastening ring and prevent the fastening ring from loosening during use.

[0019] Furthermore, a limiting ring is fixedly connected to the outside of the limiting rod, a limiting spring is sleeved on the outside of the limiting rod, and a pull ring is fixedly connected to the end of the limiting rod away from the limiting groove.

[0020] The beneficial effect of adopting the above-mentioned further solution is that the setting of the limiting ring and the limiting spring can provide a stable limiting force, ensuring the stable insertion of the limiting rod in the limiting groove.

[0021] Furthermore, a handle is fixedly connected to the top of the protective cover, and four base plates distributed in a circular pattern are fixedly connected to the side wall of the housing. A limiting groove is opened inside the housing, and a limiting slider that is slidably connected inside the limiting groove is fixedly connected to the side wall of the second wedge block.

[0022] The advantage of adopting the above-mentioned further solution is that the handle design facilitates the installation and removal of the protective cover. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0025] Figure 3 This utility model Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 This utility model Figure 2 Enlarged view of section B in the middle.

[0027] In the diagram: 1. Housing; 2. Cavity; 3. Positioning slide rod; 4. Positioning slide sleeve; 5. First wedge block; 6. Protective cover plate; 7. Second wedge block; 8. Ball bearing; 9. Fastening ring; 10. Sealing gasket; 11. Sealing groove; 12. Return spring; 13. Limiting shell; 14. Limiting rod; 15. Limiting ring; 16. Limiting spring; 17. Pull ring; 18. Handle; 19. Base plate. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In the embodiments, by Figure 1-4 The invention discloses a wellhead anti-falling object device for oil wells. The device includes a housing 1, with a cavity 2 inside the housing 1. A positioning slide rod 3 is fixedly connected to the inner wall of the cavity 2. A positioning sleeve 4 is slidably connected to the outside of the positioning slide rod 3. A first wedge block 5 is fixedly connected to the bottom of the positioning sleeve 4. A protective cover plate 6 is inserted into the top of the housing 1. A second wedge block 7 is movably connected inside the cavity 2. A ball bearing 8 is embedded in the bottom of the second wedge block 7. A fastening ring 9 is threaded onto the outside of the housing 1. A fixing groove is provided inside the protective cover plate 6. The end of the second wedge block 7 away from the ball bearing 8 contacts the inclined surface of the first wedge block 5, and the end of the first wedge block 5 away from the second wedge block 7 contacts the inclined surface of the fixing groove.

[0030] In this embodiment, in actual use, a limiting groove is provided inside the housing 1. A limiting slider is fixedly connected to the side wall of the second wedge block 7 and slidably connected inside the limiting groove. The cooperation between the limiting groove and the limiting slider can effectively limit the sliding of the second wedge block 7 and prevent the second wedge block 7 from deviating during the sliding process. The outer side of the housing 1 is provided with threads, and friction grooves are provided on the side wall of the fastening ring 9 to facilitate manual rotation of the fastening ring 9 to adjust its lifting and lowering movement. By moving the fastening ring 9 upward to abut against the ball 8, the second wedge block 7 is pushed away from the first wedge block 5. By the first wedge block 5 contacting the inclined surface of the fixing groove, the protective cover plate 6 is tightly fitted to the housing 1.

[0031] It should be noted that there are four first wedge blocks 5, which are distributed in a circle inside the housing 1. A sealing gasket 10 is fixedly connected to the top of the housing 1. A sealing groove 11 that matches the sealing gasket 10 is opened inside the protective cover plate 6. The protective cover plate 6 fits into the housing 1. Through the cooperation of the sealing gasket 10 and the sealing groove 11, the sealing performance of the device is enhanced, effectively preventing excessive external impurities from entering the oil well, and further improving the safety and reliability of the device.

[0032] Specifically, refer to Figure 3 The positioning slide rod 3 is fitted with a return spring 12. There are two positioning slide rods 3 inside the positioning slide sleeve 4. The return spring 12 can provide a stable return force. When the fastening ring 9 moves downward, the return spring 12 ensures that the positioning slide sleeve 4 can automatically return to the initial position, thereby removing the first wedge block 5 from the limiting state of the protective cover plate 6, making it easy to remove the protective cover plate 6.

[0033] Specifically, refer to Figure 3 The bottom of the fastening ring 9 is provided with a limiting component, which includes a limiting shell 13 fixedly connected to the bottom of the fastening ring 9. A limiting rod 14 is slidably connected inside the limiting shell 13. A limiting groove is opened inside the shell 1. The limiting rod 14 is inserted into the limiting groove. A limiting ring 15 is fixedly connected to the outside of the limiting rod 14. A limiting spring 16 is sleeved on the outside of the limiting rod 14. A pull ring 17 is fixedly connected to the end of the limiting rod 14 away from the limiting groove.

[0034] In this embodiment, in actual use, the limiting ring 15 and the limiting spring 16 can provide a stable limiting force. The elastic potential energy of the limiting spring 16 ensures the stable insertion of the limiting rod 14 in the limiting groove, preventing the limiting rod 14 from loosening during use. The design of the pull ring 17 facilitates the pulling operation of the limiting rod 14, improving the ease of use of the device. The limiting component can effectively limit the position of the fastening ring 9, preventing the fastening ring 9 from loosening during use, ensuring the fastening performance of the device, and further improving the stability and reliability of the device.

[0035] In this embodiment, in actual use, a handle 18 is fixedly connected to the top of the protective cover 6, and four base plates 19 arranged in a circular pattern are fixedly connected to the side wall of the housing 1. The design of the handle 18 facilitates the installation and disassembly of the protective cover 6, improving the ease of use of the device. Holes are opened inside the base plates 19, and bolts (or drill bits) are set in the holes to fix the base plates 19 to the ground. The setting of the base plates 19 enhances the stability of the housing 1 and ensures the stability of the device during use.

[0036] Working principle:

[0037] By fitting the housing 1 onto the wellhead of the oil well and fixing the base plate 19 to the ground with bolts (or drill nails), by inserting the protective cover 6 into the inside of the housing 1 and manually rotating the fastening ring 9, the fastening ring 9 moves upward to abut against the ball 8, thereby pushing the second wedge block 7 away from the first wedge block 5. By having the first wedge block 5 contact the inclined surface of the fixing groove, the protective cover 6 is limited and fixed while being tightly fitted to the housing 1. The sealing performance of the device is enhanced by the sealing gasket 10 pressing the inner wall of the sealing groove 11.

[0038] Meanwhile, the limiting component can effectively limit the position of the fastening ring 9 to prevent it from loosening during use. When the protective cover plate 6 needs to be removed, the limiting rod 14 is pulled by the pull ring 17, causing the fastening ring 9 to rotate and move downward. The second wedge block 7 slides down under gravity, and the positioning sleeve 4 can be automatically restored to its initial position by the reset spring 12, thereby canceling the limiting state of the first wedge block 5 on the protective cover plate 6, and the protective cover plate 6 can be easily removed.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 said element.

[0040] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wellhead anti-falling object device for oil extraction, comprising a housing (1), characterized in that: The housing (1) has an internal cavity (2). A positioning slide rod (3) is fixedly connected to the inner wall of the cavity (2). A positioning slide sleeve (4) is slidably connected to the outside of the positioning slide rod (3). A first wedge block (5) is fixedly connected to the bottom of the positioning slide sleeve (4). A protective cover plate (6) is inserted into the top of the housing (1). A second wedge block (7) is movably connected inside the cavity (2). A ball bearing (8) is embedded in the bottom of the second wedge block (7). A fastening ring (9) is threadedly connected to the outside of the housing (1). A limit component is provided at the bottom of the fastening ring (9).

2. The wellhead anti-falling object device for oil extraction according to claim 1, characterized in that: A sealing gasket (10) is fixedly connected to the top of the housing (1), and a sealing groove (11) adapted to the sealing gasket (10) is opened inside the protective cover plate (6).

3. The wellhead anti-falling object device for oil extraction according to claim 1, characterized in that: The positioning slide rod (3) is fitted with a return spring (12), and the positioning slide sleeve (4) has two positioning slide rods (3).

4. The wellhead anti-falling object device for oil extraction according to claim 1, characterized in that: The protective cover (6) has a fixing groove inside. The end of the second wedge block (7) away from the ball (8) is in contact with the inclined surface of the first wedge block (5). The end of the first wedge block (5) away from the second wedge block (7) is in contact with the inclined surface of the fixing groove.

5. The wellhead anti-falling object device for oil extraction according to claim 1, characterized in that: The limiting component includes a limiting shell (13) fixedly connected to the bottom of the fastening ring (9), a limiting rod (14) is slidably connected inside the limiting shell (13), a limiting groove is opened inside the shell (1), and the limiting rod (14) is inserted into the limiting groove.

6. The wellhead anti-falling object device for oil extraction according to claim 5, characterized in that: The limiting rod (14) is fixedly connected to the outside of the limiting ring (15), and the limiting rod (14) is sleeved with a limiting spring (16). The end of the limiting rod (14) away from the limiting groove is fixedly connected with a pull ring (17).

7. The wellhead anti-falling object device for oil extraction according to claim 1, characterized in that: The top of the protective cover (6) is fixedly connected to a handle (18), and four base plates (19) are fixedly connected to the side wall of the housing (1) and are distributed in a circular pattern. A limiting groove is opened inside the housing (1), and a limiting slider is fixedly connected to the side wall of the second wedge block (7) and is slidably connected inside the limiting groove.

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