A new type of automatic anti-falling device for borehole wellhead

Abstract

The utility model discloses a novel automatic anti -falling device of borehole well mouth relates to well drilling equipment technical field, including the fixed box of covering on the upside of well mouth, the central hole of corresponding well mouth is equipped in the middle part of fixed box, two comb tooth shape's slide plates are equipped with in the horizontal sliding of fixed box, the slide plate includes the board strip part and the comb tooth part of being connected in one side of board strip part, and the comb tooth part of two slide plates is opposite, and interlaced sliding inserts, and the middle part of the end of the comb tooth part of two slide plates is equipped with first semicircle groove, the utility model discloses the fixed box with central hole is set in the upside of well mouth, has improved the flatness of well mouth outside, can shelter well mouth through two comb tooth shape's slide plates in the relative interlaced sliding of fixed box, can avoid the tool falling into the well, and can avoid the occurrence of falling object accident, can be encircled in the outside of drill pipe through first semicircle groove, can be fully inserted and form the well mouth center shelter when no drill pipe.

Description

Technical Field

[0001] This utility model relates to the field of drilling equipment technology, and in particular to a novel automatic anti-fall device for borehole wellheads. Background Technology

[0002] In oil drilling engineering, the drilling rig is the main drilling equipment. The wellhead is prone to falling object accidents, such as drill strings, drilling tools, and hand tools falling into the well. These accidents occur when tools are carelessly placed on the rotary table, causing them to collide with the workpiece or fall into the well due to the rotation of the rotary table. In oil drilling, falling objects, whether bolts, crowbars, or drill bits, can easily cause the drill string to jam, damage downhole instruments and equipment, and require significant manpower and resources to retrieve. They also increase the difficulty of the work for the workers. Falling objects inside the wellhead can disrupt normal drilling operations and even cause wellhead safety accidents. Furthermore, working at the exposed wellhead also carries inherent risks for the workers. Utility Model Content

[0003] The purpose of this utility model is to solve at least one of the problems in the prior art mentioned above, and to provide a new type of automatic anti-fall device for borehole wellheads.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A novel automatic fall prevention device for borehole openings includes a fixed box covering the upper side of the wellhead. The fixed box has a central hole corresponding to the wellhead in the middle. Two comb-shaped sliding plates are horizontally slidable inside the fixed box. Each sliding plate includes a slat portion and a comb portion connected to one side of the slat portion. The comb portions of the two sliding plates are opposite to each other and are slidably inserted in an alternating manner. A first semi-circular groove is provided at the middle of the end of the comb portion of each sliding plate.

[0005] Furthermore, the ends of the comb teeth of both slide plates are provided with a second semi-circular groove, and the first semi-circular groove is located in the middle of the second semi-circular groove.

[0006] Furthermore, the fixed box has openings at both ends, and several reinforcing rods are connected between the upper and lower walls of the openings.

[0007] Furthermore, the lower wall of the fixed box is provided with horizontally outward extensions at the four corners, and the extensions are provided with mounting holes.

[0008] Furthermore, the upper wall of the fixed box is provided with a strip-shaped hole, the length of which extends parallel to the sliding direction of the slide plate, and a square post passing through the strip-shaped hole is connected to the upper side of the plate section.

[0009] Furthermore, a vertically movable plate is connected to the upper side of the square column, a positioning column is connected to the lower side of the movable plate, and a number of positioning holes that cooperate with the positioning columns are provided on the upper side of the fixed box.

[0010] Furthermore, an inverted U-shaped handle is connected to the upper side of the movable plate; a blind hole is provided on the upper side of the square column, and a guide column that slides vertically along the blind hole is connected to the lower side of the movable plate, with a spring connecting the guide column and the bottom of the blind hole.

[0011] Furthermore, the positioning holes are arranged along the length of the strip hole, with each strip hole corresponding to three sets of positioning holes, which correspond to the two ends and the middle of the strip hole, respectively.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model uses a fixed box with a central hole set on the upper side of the wellhead, which improves the flatness of the outer side of the wellhead; by having two comb-shaped sliding plates slide relative to each other in the fixed box, the wellhead can be blocked to prevent tools from falling into the well and to prevent falling object accidents; the first semi-circular groove can be wrapped around the outside of the drill rod, and when there is no drill rod, it can be fully inserted to form a central blockage of the wellhead. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] Figure 2 This is a schematic diagram of the fixed box structure of this utility model.

[0015] Figure 3 This is a schematic diagram of the sliding plate and drill rod in the engagement state of this utility model.

[0016] Figure 4 This is an exploded view of the square column and its connecting structure of this utility model.

[0017] Figure 5 This is a schematic diagram of the sliding plate and wellhead of this utility model in a coordinated state.

[0018] Figure 6 This is a schematic diagram showing the state in which the sliding plate of this utility model fully covers the well opening.

[0019] In the diagram: 1. Fixed box; 2. Center hole; 3. Slide plate; 4. Opening; 5. Reinforcing rod; 6. Mounting hole; 7. Strip hole; 8. Square column; 9. Movable plate; 10. Inverted U-shaped handle; 11. Positioning column; 12. Positioning hole; 13. Blind hole; 14. Guide column; 15. Spring; 31. Slat section; 32. Comb section; 33. Second semicircular groove; 34. First semicircular groove. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0021] Specific embodiment 1 of the novel automatic fall prevention device for borehole wellheads provided by this utility model: Please see Figures 1-6 A new type of automatic anti-fall device for borehole openings includes a fixed box 1 covering the upper side of the wellhead. The fixed box 1 has a central hole 2 corresponding to the wellhead in the middle. The fixed box 1 has a thin box structure. The upper and lower walls of the fixed box 1 are provided with central holes 2, which correspond to the wellhead and have the same diameter.

[0022] There is a vertical gap between the upper and lower walls of the fixing box 1. Both ends of the fixing box 1 are provided with openings 4, and several reinforcing rods 5 are connected between the upper and lower walls at the openings 4. The lower wall of the fixing box 1 is provided with horizontal outward extensions at the four corners, and the extensions are provided with mounting holes 6. The fixing box 1 can be fixed to the upper side of the wellhead by bolts through the mounting holes 6.

[0023] Two comb-shaped sliding plates 3 are horizontally slidable inside the fixed box 1. Each sliding plate 3 includes a slat portion 31 and a comb portion 32 connected to one side of the slat portion 31. The comb portion 32 includes several comb teeth vertically connected to one side of the slat portion 31. The spacing between adjacent comb teeth is the same, and the spacing between adjacent comb teeth is slightly larger than the width of the comb teeth. The smaller the spacing between the comb teeth, the better the shielding effect. Preferably, the spacing between adjacent comb teeth is set to be smaller than the outer diameter of the bolt head used on site, which can achieve a comprehensive anti-falling effect.

[0024] The slat portion 31 faces the opening 4 at the end of the fixed box 1 on the side opposite to the comb tooth portion 32, and the slide plate 3 slides between the upper and lower walls of the fixed box 1. The comb tooth portions 32 of the two slide plates 3 are opposite to each other and are interlocked, and the comb tooth of one slide plate 3 can slide between the two comb teeth of the other slide plate 3.

[0025] Each of the two slide plates 3 has a first semi-circular groove 34 at the center of its comb-tooth portion 32, and a second semi-circular groove 33 at the center of its comb-tooth portion 32. The first semi-circular groove 34 is located in the center of the second semi-circular groove 33. The semi-circular diameter of the second semi-circular groove 33 is the same as the diameter of the wellhead, and the semi-circular diameter of the first semi-circular groove 34 is slightly larger than the outer diameter of the drill pipe. The second semi-circular groove 33 is used to mate with the wellhead and fully release the wellhead; the first semi-circular groove 34 is used to surround the drill pipe, blocking the gap between the drill pipe and the wellhead to prevent objects from falling into the well.

[0026] In this embodiment, two electric telescopic rods are installed at both ends of the fixed box 1, each corresponding to one of the two slide plates 3. The telescopic ends of the electric telescopic rods are connected to the slat portions 31 of their corresponding slide plates 3, driving the slide plates 3 to slide back and forth.

[0027] Specific embodiment 2 of the novel automatic anti-fall device for borehole wellheads provided by this utility model: Please see Figures 1-6The upper wall of the fixed box 1 is provided with a strip-shaped hole 7. The length of the strip-shaped hole 7 extends parallel to the sliding direction of the slide plate 3. There are two strip-shaped holes 7, symmetrically located on both sides of the central hole 2. The two strip-shaped holes 7 correspond to the two slide plates 3 respectively. A square post 8 passing through the strip-shaped hole 7 is connected to the upper side of the slat part 31 of the slide plate 3. The square post 8 extends through the strip-shaped hole 7 to the upper side of the fixed box 1. Moving the square post 8 allows the slide plate 3 to slide in the fixed box 1.

[0028] The upper side of the square column 8 is connected to a vertically lifting movable plate 9. Specifically, the upper side of the square column 8 is provided with a blind hole 13, and the lower side of the movable plate 9 is connected to a guide column 14 that slides vertically along the blind hole 13. A spring 15 is connected between the guide column 14 and the bottom of the blind hole 13. There are two blind holes 13, two guide columns 14 and two springs 15. The spring 15 makes the guide column 14 and the movable plate 9 move downward.

[0029] An inverted U-shaped handle 10 is connected to the upper side of the movable plate 9. By pulling the movable plate 9 upward with the inverted U-shaped handle 10, the guide column 14 can move upward against the elastic force of the spring 15. By moving the movable plate 9 with the inverted U-shaped handle 10, the movable plate 9 drives the square column 8 to move along the strip hole 7, thereby realizing the movement of the slide plate 3 inside the fixed box 1.

[0030] The movable plate 9 is connected to a positioning post 11 on its lower side. There are two positioning posts 11 on the lower side of the movable plate 9, located at both ends of the movable plate 9 and corresponding to both sides of the strip hole 7. The upper side of the fixed box 1 is provided with several positioning holes 12 that cooperate with the positioning posts 11.

[0031] When the inverted U-shaped handle 10 and the movable plate 9 are pulled upwards, the guide post 14 and the movable plate 9 move upwards against the spring force of the spring 15, causing the positioning post 11 to move out of the positioning hole 12. Then the movable plate 9 and the square post 8 can be moved laterally, causing the slide plate 3 to slide laterally. When the positioning post 11 corresponds to the positioning hole 12, the spring 15 causes the movable plate 9 and the positioning post 11 to move downwards, and the positioning post 11 extends into the positioning hole 12, thereby locking the position of the square post 8. The square post 8 and the slide plate 3 cannot move. By setting multiple positioning holes 12, the slide plate 3 can be locked in different positions.

[0032] The positioning holes 12 are arranged along the length of the strip hole 7, with each strip hole 7 corresponding to three sets of positioning holes 12. The three sets of positioning holes 12 correspond to the two ends and the middle of the strip hole 7, respectively. There are two positioning holes 12 in each set, and the two positioning holes 12 in the same set are symmetrical on both sides of the strip hole 7.

[0033] When the positioning pin 11 mates with a set of positioning holes 12 that are furthest from the center hole 2, the distance between the slat portions 31 of the two slide plates 3 is at its maximum. Figure 5 As shown, the second semicircular groove 33 corresponds to the wellhead and does not affect the wellhead's unobstructed flow; when the positioning pin 11 mates with a set of positioning holes 12 in the middle of the strip hole 7, as... Figure 3As shown, two first semicircular grooves 34 surround the drill pipe, blocking the gap between the outer side of the drill pipe and the wellhead; when the positioning pin 11 mates with a set of positioning holes 12 near the central hole 2, as... Figure 6 As shown, the spacing between the slats 31 of the two slide plates 3 is the smallest, and the comb teeth of the two slide plates 3 are all interlocked, completely covering the well opening.

[0034] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A novel automatic fall prevention device for borehole wellheads, characterized in that, The device includes a fixed box (1) covering the upper side of the wellhead. The fixed box (1) has a central hole (2) corresponding to the wellhead in the middle. Two comb-shaped sliding plates (3) are horizontally slidable inside the fixed box (1). The sliding plates (3) include a slat part (31) and a comb part (32) connected to one side of the slat part (31). The comb parts (32) of the two sliding plates (3) are opposite to each other and are slidably inserted. The middle of the end of the comb parts (32) of the two sliding plates (3) is provided with a first semi-circular groove (34).

2. The novel automatic fall prevention device for borehole wellheads according to claim 1, characterized in that, The comb teeth (32) of both slide plates (3) are provided with a second semi-circular groove (33) at the end, and the first semi-circular groove (34) is located in the middle of the second semi-circular groove (33).

3. The novel automatic fall prevention device for borehole wellheads according to claim 1, characterized in that, The fixed box (1) has openings (4) at both ends, and a number of reinforcing rods (5) are connected between the upper and lower walls at the openings (4).

4. The novel automatic fall prevention device for borehole wellheads according to claim 1, characterized in that, The fixed box (1) has horizontal outward extensions at the four corners of its lower wall, and the extensions have mounting holes (6).

5. The novel automatic fall prevention device for borehole wellheads according to claim 1, characterized in that, The upper wall of the fixed box (1) is provided with a strip hole (7), the length extension direction of the strip hole (7) is parallel to the sliding direction of the slide plate (3), and a square post (8) passing through the strip hole (7) is connected to the upper side of the strip part (31).

6. The novel automatic fall prevention device for borehole wellheads according to claim 5, characterized in that, The upper side of the square column (8) is connected to a vertically lifting movable plate (9), the lower side of the movable plate (9) is connected to a positioning column (11), and the upper side of the fixed box (1) is provided with several positioning holes (12) that cooperate with the positioning column (11).

7. The novel automatic fall prevention device for borehole wellheads according to claim 6, characterized in that, The upper side of the movable plate (9) is connected to an inverted U-shaped handle (10); the upper side of the square column (8) is provided with a blind hole (13), and the lower side of the movable plate (9) is connected to a guide column (14) that slides vertically along the blind hole (13). A spring (15) is connected between the guide column (14) and the bottom of the blind hole (13).

8. The novel automatic fall prevention device for borehole wellheads according to claim 6, characterized in that, The positioning holes (12) are arranged along the length of the strip hole (7), and each strip hole (7) corresponds to three sets of positioning holes (12). The three sets of positioning holes (12) correspond to the two ends and the middle of the strip hole (7), respectively.

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