Wellhead safety clamping plate device

Abstract

The utility model relates to a clamping plate, in particular to a wellhead safety clamping plate device which is used for being matched with a perforating gun to plug a wellhead and comprises a first clamping plate and a second clamping plate. A U-shaped groove matched with the radial section of the small parallel section of the perforating gun in shape is formed in the first clamping plate, and an opening of the U-shaped groove is located in the outer wall of the first clamping plate; one end of the second clamping plate is provided with an arc clamping opening matched with the radial section of the large-diameter section of the perforating gun in shape. The second clamping plate is arranged at the top of the U-shaped groove in the first clamping plate, after the second clamping plate and the first clamping plate are spliced, the small parallel section of the perforating gun is clamped in the U-shaped groove, and the arc bayonet is attached to the outer wall of the large-diameter section of the perforating gun. The well mouth clamping plate solves the problems that an existing well mouth clamping plate can only shield part of a well mouth, and residues in a tool and a perforating gun used in the operation process still possibly fall into a shaft from the unshielded part, and has the advantages of preventing falling objects from falling into the shaft, being capable of limiting rotation of the whole device and being suitable for different types of well mouths.

Description

Technical Field

[0001] The utility model relates to a clamping plate, in particular to a wellhead safety clamping plate device. Background Art

[0002] During on-site construction of oil and gas wells, perforating operations are required. When the perforating section in the well is longer than the length of a single perforating gun, multiple perforating guns need to be combined and connected; when the perforating section is longer than the height of the traveling carriage of the derrick, multiple perforating guns also need to be combined and connected to meet the length of the perforating section.

[0003] The safety card plate is used to connect and disassemble the upper and lower perforating guns. It is stuck in the parallel groove of the joint, so that the perforating gun below the wellhead sits on the safety card plate and does not fall into the oil and gas well. The safety card plate device can also prevent tools such as screwdrivers, wrenches, bolts, etc. used during wellhead perforating construction from falling into the well.

[0004] In order to facilitate the recovery of the gun, the assembled perforating guns need to be disassembled at the wellhead during recovery, and then recovered in sections. However, when disassembling at the wellhead, if the retaining ring used to block the positioning ring in the perforating gun is damaged, or the positioning ring in the perforating gun is damaged, the perforating residue in the perforating gun will inevitably fall out of the perforating gun, and some of the residue will fall into the wellhead, which may cause accidents such as pipe string jamming and pipe string jamming; if there are too many residues falling into the wellhead, or the volume is large, or there are many hard objects, it will also make it difficult to carry out subsequent operations in the wellbore. If it causes blockage in the well, it will also need to be salvaged with special salvage tools, increasing the operation cost.

[0005] In order to prevent this from happening, a safety card is used at the wellhead to block the perforating gun when it is connected and recovered. The structure of the existing safety card is usually as follows: Figure 1 As shown, it includes a long strip of card board, on which a U-shaped groove is opened, and the opening 02 of the U-shaped groove is located at the front end of the long strip of card board. When in use, the perforating gun is inserted into the U-shaped groove through the opening of the U-shaped groove, so that the arc edge 01 of the U-shaped groove abuts against the outer wall of the perforating gun. Because the on-site conditions of oil and gas wells are limited, only simple structures and ease of use can be pursued. This card board can close most of the wellhead, but part of the U-shaped groove is not blocked. Although this part is small, there is still a risk that residues and tools used during operation will fall into the wellbore from the unblocked part. Utility Model Content

[0006] The utility model aims to solve the problem that the existing wellhead clamping plate can only cover part of the wellhead, and the tools used during operation and the residues in the perforating gun may still fall into the wellbore from the uncovered part, and provide a wellhead safety clamping plate device.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A wellhead safety clamping plate device is used to cooperate with a perforating gun to seal a wellhead, comprising a first clamping plate, a U-shaped groove is provided on the first clamping plate, the U-shaped groove is adapted to the radial cross-sectional shape of the small parallel section at the bottom end of the perforating gun, and the opening of the U-shaped groove is located on the outer wall of the first clamping plate; the U-shaped groove is used to clamp with the small parallel section of the perforating gun; the special features thereof are:

[0009] Also includes a second card plate;

[0010] One end of the second clamping plate is provided with an arc clamping port adapted to the radial cross-sectional shape of the large-diameter section at the top end of the perforating gun;

[0011] The second clamping plate is located at the top of the U-shaped groove and is spliced ​​therewith; the arc clamping mouth is fitted with the outer wall of the large diameter section of the perforating gun.

[0012] Furthermore, a counter-torque hole is provided on the first clamping plate, and the counter-torque hole is arranged corresponding to the threaded hole of the connecting flange on the wellhead.

[0013] Furthermore, the first clamping plate is a circular structure with a U-shaped groove, and the center of the arc edge of the U-shaped groove coincides with the center of the first clamping plate;

[0014] The second clamping plate is a plate-shaped structure with an arc-shaped edge, and the arc-shaped clamping opening is located at an end of the second clamping plate away from the arc-shaped edge;

[0015] The projection of the arc-shaped edge of the second clamping plate in the vertical direction and the projection of the outer wall of the first clamping plate in the vertical direction form a circle.

[0016] Furthermore, an anti-torque booster rod cannula is arranged on the top of the first clamping plate along the radial direction corresponding to the perforating gun.

[0017] Furthermore, the inner diameter of the torque booster rod tube is 40 mm.

[0018] Furthermore, two positioning pins are provided on the bottom surface of the second clamping plate, and outer walls of the two positioning pins are respectively abutted against two side walls of the U-shaped groove.

[0019] Furthermore, the anti-torque hole is a waist hole, and the anti-torque hole is arranged along the radial direction of the first clamping plate.

[0020] Furthermore, two first handles are symmetrically arranged on the outer wall of the first clamping plate on both sides of the center line of the U-shaped groove.

[0021] Furthermore, a second handle is connected to one end of the top of the second clamping plate close to the arc-shaped edge.

[0022] Furthermore, chamfers are provided at the intersections of the two side walls of the U-shaped groove and the outer wall of the first clamping plate.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] (1) The utility model provides a wellhead safety clamping plate device, which realizes the overall sealing of the wellhead by cooperating the U-shaped groove on the first clamping plate with the small parallel section of the perforating gun, and the arc clamping mouth on the second clamping plate with the large diameter section of the perforating gun. In this way, when the perforating gun is disassembled in sections at the wellhead, even if there is falling objects, they will be blocked by the first clamping plate and the second clamping plate to prevent them from falling into the wellbore, thereby ensuring mining safety.

[0025] (2) The utility model provides a wellhead safety cardboard device, in which an anti-torque hole and an anti-torque booster rod insert are provided on the first cardboard. The anti-torque hole is used to cooperate with a wellhead provided with a connecting flange, while the anti-torque booster rod insert is suitable for a wellhead without a connecting flange. The anti-torque hole corresponds to the threaded hole of the connecting flange, and the bolt is screwed into the threaded hole of the connecting flange through the anti-torque hole. In this way, when the perforating gun is disassembled, the bolt cooperates with the anti-torque hole to limit the rotation of the entire device; the booster rod can be inserted into the anti-torque booster rod insert, and the rotation of the entire device is limited by fixing the position of the booster rod. The utility model has a simple structure and can be applied to different types of wellheads, with strong versatility.

[0026] (3) The utility model provides a wellhead safety clamping plate device, in which the anti-torque hole is designed as a waist hole, and the anti-torque hole is arranged along the radial direction of the first clamping plate, so that it can adapt to connecting flanges of different sizes and specifications, thereby improving versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of an existing safety card board;

[0028] Figure 2 This is a structural schematic diagram of an embodiment of the wellhead safety clamp device of the utility model in a use state;

[0029] Figure 3 A top view of the first clamping plate in the embodiment of the utility model;

[0030] Figure 4 for Figure 3 A front view of the invention (without showing the anti-torque booster rod cannula);

[0031] Figure 5 A top view of the second clamping plate in the embodiment of the utility model;

[0032] Figure 6 for Figure 5 Front view of .

[0033] The following are the descriptions of the reference numerals:

[0034] 01-arc edge, 02-opening, 1-first clamping plate, 11-anti-torque hole, 12-U-shaped groove; 2-second clamping plate, 21-arc bayonet, 22-locating pin; 3-perforating gun, 4-first handle, 5-second handle, 6-anti-torque booster rod insertion tube. DETAILED DESCRIPTION

[0035] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] Reference Figure 2-Figure 6 The utility model discloses a wellhead safety cardboard device, which is used to cooperate with a perforating gun 3 to block the wellhead and prevent objects from falling into the wellhead. The perforating gun 3 includes a large diameter section at the top and a small parallel section at the bottom. The radial cross-section of the small parallel section is waist-shaped, including arc edges at both ends and straight edges connecting the ends of the two arc edges. The wellhead safety cardboard device includes a first cardboard 1 and a second cardboard 2. The structure of the first cardboard 1 is as follows: Figure 3 , Figure 4 As shown, the first clamping plate 1 is a circular structure with a U-shaped groove 12. In this embodiment, the diameter of the first clamping plate 1 is 300 mm, the center of the arc edge of the U-shaped groove 12 coincides with the center of the first clamping plate 1, and the shape of the U-shaped groove 12 is adapted to the radial cross-sectional shape of the small parallel section of the perforating gun 3. The opening of the U-shaped groove 12 is located on the outer wall of the first clamping plate 1, so that when in use, the small parallel section of the perforating gun 3 can be inserted into the U-shaped groove 12 through the opening of the U-shaped groove 12 of the first clamping plate 1, so that most of the wellheads can be closed. In order to facilitate the transportation of the first clamping plate 1, two first handles 4 are symmetrically arranged on the outer wall of the first clamping plate 1 on both sides of the center line of the U-shaped groove 12, which can be operated with both hands at the same time during transportation, which is convenient for on-site operators.

[0037] If only the first card plate 1 is set at the wellhead, the problem is the same as that of the existing wellhead card plate, and part of the U-shaped groove 12 is not blocked, so a second card plate 2 is also set at the top position of the U-shaped groove 12 of the first card plate 1. The structure of the second card plate 2 is as follows: Figure 5 , Figure 6 As shown, the second clamping plate 2 is a plate-like structure with an arc-shaped edge, and an arc-shaped bayonet 21 adapted to the radial cross-sectional shape of the large diameter section of the perforating gun 3 is provided at one end away from the arc-shaped edge. Two positioning pins 22 are provided on the bottom surface of the second clamping plate 2, and the outer walls of the two positioning pins 22 are respectively abutted against the two side walls of the U-shaped groove 12. When the first clamping plate 1 and the second clamping plate 2 are spliced ​​in the radial direction, the two positioning pins 22 limit the second clamping plate 2. In order to facilitate the two positioning pins 22 to enter the U-shaped groove 12, chamfers are provided at the intersection of the two side walls of the U-shaped groove 12 and the outer wall of the first clamping plate 1. In order to facilitate picking up and carrying, a second handle 5 is connected to the top of the second clamping plate 2 near the arc-shaped edge.

[0038] When in use, first use the U-shaped groove 12 of the first clamping plate 1 to clamp the small parallel section of the perforating gun 3 at the wellhead, and then splice the second clamping plate 2 with the U-shaped groove 12 of the first clamping plate 1 in the radial direction until the arc clamping port 21 fits the outer wall of the large diameter section of the perforating gun 3, and the second clamping plate 2 is located at the top of the U-shaped groove 12 of the first clamping plate 1, and the two positioning pins 22 are respectively abutted against the two side walls of the U-shaped groove 12, so that the two are spliced ​​together at the wellhead. After splicing, the projection of the arc edge of the second clamping plate 2 in the vertical direction and the projection of the outer wall of the first clamping plate 1 in the vertical direction form a circle, so that the wellhead is completely closed, and the tools used during operation and the residue in the perforating gun 3 will not fall into the wellbore. The perforating gun 3 needs to be rotated when disassembling and assembling, because the small parallel section of the perforating gun 3 is stuck in the U-shaped groove 12 of the first clamping plate 1, and the U-shaped groove 12 acts as a pipe clamp. When disassembling the perforating gun 3, the small parallel section of the perforating gun 3 will transmit a torque to the entire device through the U-shaped groove 12. If the rotation of the device is not restricted, the entire perforating gun 3 will rotate and cannot be disassembled in sections. Therefore, it is necessary to restrict the rotation of the perforating gun 3 by restricting the rotation of the entire device.

[0039] There are two main types of wellheads at present. The first type has a connecting flange, such as a vertical well and a horizontal well; the second type does not have a connecting flange, such as a drilling rig platform. For the first type of wellhead with a connecting flange, an anti-torque hole 11 is provided on the first clamping plate 1. The anti-torque hole 11 corresponds to the threaded hole of the connecting flange on the wellhead. In order to adapt to connecting flanges of different sizes, the anti-torque hole 11 is designed as a waist hole, and the anti-torque hole 11 is arranged along the radial direction of the first clamping plate 1. When in use, the bolt is screwed into the threaded hole of the connecting flange through the anti-torque hole 11. When the perforating gun 3 rotates, the bolt in the anti-torque hole 11 is used to stop the rotation, and no human power is required to limit the rotation of the device, which is convenient and labor-saving. For the second wellhead without connecting flange, an anti-torque booster rod insert 6 is provided at the top of the first clamp 1 corresponding to the radial direction of the perforating gun 3. The inner diameter of the anti-torque booster rod insert 6 is 40 mm, and a booster rod with a diameter of 40 mm can be inserted and the position of the booster rod can be fixed with the help of the railings of the wellhead, so as to limit the rotation of the entire device. The booster rod with a diameter of 40 mm can be made of a standard steel pipe or steel rod, saving processing time. If there is no anti-torque hole 11 and anti-torque booster rod insert 6, the on-site personnel need to use a pipe clamp to limit the rotation. The anti-torque hole 11 and the anti-torque booster rod insert 6 save manpower and tool usage, and reduce the operating cost. If the on-site personnel operate the pipe clamp because the torque is too large and the pipe clamp slips off, the personnel are at risk of slipping and getting injured. The use of the anti-torque hole 11 and the anti-torque booster rod insert 6 can improve the construction safety.

[0040] The embodiments described above are merely descriptions of the specific implementation methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A wellhead safety clamping plate device, used for cooperating with a perforating gun (3) to seal a wellhead, comprising a first clamping plate (1), the first clamping plate (1) being provided with a U-shaped groove (12), the U-shaped groove (12) being adapted to the radial cross-sectional shape of the small parallel section at the bottom end of the perforating gun (3), the opening of the U-shaped groove (12) being located on the outer wall of the first clamping plate (1); the U-shaped groove (12) being used for clamping with the small parallel section of the perforating gun (3); Features: Also includes a second card plate (2); One end of the second clamping plate (2) is provided with an arc clamping socket (21) adapted to the radial cross-sectional shape of the large-diameter section at the top end of the perforating gun (3); The second clamping plate (2) is located at the top of the U-shaped groove (12) and is spliced ​​therewith; the arc clamping mouth (21) is in contact with the outer wall of the large diameter section of the perforating gun (3).

2. The wellhead safety clamp device according to claim 1, characterized in that: A counter-torque hole (11) is provided on the first clamping plate (1), and the counter-torque hole (11) is arranged corresponding to the threaded hole of the connecting flange on the wellhead.

3. The wellhead safety clamp device according to claim 2, characterized in that: The first clamping plate (1) is a circular structure with a U-shaped groove (12), and the center of the arc edge of the U-shaped groove (12) coincides with the center of the first clamping plate (1); The second clamping plate (2) is a plate-like structure with an arc-shaped edge, and the arc-shaped clamping opening (21) is located at an end of the second clamping plate (2) away from the arc-shaped edge; The projection of the arc-shaped edge of the second clamping plate (2) in the vertical direction and the projection of the outer wall of the first clamping plate (1) in the vertical direction form a circle.

4. The wellhead safety clamp device according to claim 3, characterized in that: An anti-torque booster rod insert (6) is arranged on the top of the first clamping plate (1) along a radial direction corresponding to the perforating gun (3).

5. The wellhead safety clamp device according to claim 4, characterized in that: The inner diameter of the torque booster rod insert (6) is 40 mm.

6. The wellhead safety clamp device according to claim 5, characterized in that: Two positioning pins (22) are arranged on the bottom surface of the second clamping plate (2), and the outer walls of the two positioning pins (22) are respectively in contact with the two side walls of the U-shaped groove (12).

7. The wellhead safety clamp device according to claim 6, characterized in that: The anti-torque hole (11) is a waist hole, and the anti-torque hole (11) is arranged along the radial direction of the first clamping plate (1).

8. The wellhead safety clamp device according to claim 7, characterized in that: Two first handles (4) are symmetrically arranged on the outer wall of the first clamping plate (1) on both sides of the center line of the U-shaped groove (12).

9. The wellhead safety clamp device according to claim 8, characterized in that: A second handle (5) is connected to one end of the top of the second clamping plate (2) close to the arc-shaped edge.

10. The wellhead safety clamp device according to claim 6, characterized in that: Chamfers are provided at the intersections of the two side walls of the U-shaped groove (12) and the outer wall of the first clamping plate (1).

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