A slip

Abstract

The present application belongs to the technical field of oil drilling, and particularly relates to a slip. The slip comprises: a bearing main body; a plurality of slide rails which are uniformly arranged in the bearing main body in a circumferential direction, and are arranged obliquely relative to a central axis of the bearing main body; a tong tooth which is movably arranged on each slide rail; and a telescopic cylinder which is used for driving the tong tooth to move along the slide rail.

Description

Technical Field

[0001] This invention belongs to the field of oil drilling technology, specifically, it relates to a type of slip. Background Technology

[0002] The primary function of slips is to hold and suspend the tubing string during drilling operations, particularly when tripping the drill string. Currently, most slips are manually operated; during tripping, the drilling operator manually lifts the slips and places them into the wellhead to hold the tubing string in place.

[0003] In the existing technology, automatic clamps can be applied to tubing of different sizes, and different sizes of tubing correspond to different clamps. When dealing with tubing of different sizes, the clamps need to be changed, and changing the clamps requires disassembling the entire clamping structure, which is a complicated process.

[0004] Therefore, there is an urgent need to develop a slip that can be used for tubing of different sizes without changing the clamp teeth. Summary of the Invention

[0005] To address the technical problems described above, the present invention aims to provide a slip that can be applied to slips of different sizes of tubing without the need to change the clamp teeth.

[0006] According to the present invention, a kava is provided, comprising:

[0007] The main body of the load-bearing structure;

[0008] Multiple slide rails are evenly arranged circumferentially within the bearing body, and the slide rails are inclined relative to the central axis of the bearing body.

[0009] Movable jaws mounted on each of the slide rails;

[0010] A telescopic cylinder for driving the jaws to move along the slide rail.

[0011] In one specific embodiment, the extension line of the slide rail intersects the central axis of the supporting body.

[0012] In one specific embodiment, the slide rail is configured to gradually approach the central axis of the supporting body from top to bottom.

[0013] In one specific embodiment, a cover plate that can be opened and closed is provided at the upper end of the supporting body.

[0014] In one specific embodiment, the cover plate is constructed in a semi-circular shape, and the two cover plates are hinged together at the upper end of the supporting body.

[0015] In one specific embodiment, a straightening plate is provided on the radially inner side of the cover plate.

[0016] In one specific embodiment, the supporting body includes two semi-cylindrical supporting members, which are detachably connected to each other.

[0017] In one specific embodiment, connecting ears are provided on the contact surfaces of the two carriers, and a connecting shaft is provided inside the connecting ears.

[0018] In one specific embodiment, the connecting ear includes a first connecting ear disposed on the upper part of the carrier and a second connecting ear disposed on the lower part of the carrier. A first connecting shaft and a second connecting shaft are respectively disposed in the first connecting ear and the second connecting ear. The first connecting ear is farther away from the central axis of the carrier body than the second connecting ear.

[0019] In one specific embodiment, each of the jaws corresponds one-to-one with each of the telescopic cylinders.

[0020] Compared with the prior art, the advantages of this application are as follows.

[0021] The clamps of this invention have multiple slide rails evenly arranged along the circumference inside. The slide rails are designed as ramps, and the jaws are movable on the slide rails. With this arrangement, when the clamps on each slide rail move upward along the slide rail, the gap between the clamps increases, thereby enabling the clamping of large-sized tubing. When the clamps on each slide rail move downward along the slide rail, the gap between the clamps decreases, thereby enabling the clamping of small-sized tubing.

[0022] In addition, when clamping small-sized tubing, a few slips on the slide rails move downwards along the slide rails, thus avoiding excessive slips from converging in the middle and interfering with the process, making it suitable for even smaller tubing. Attached Figure Description

[0023] The present invention will now be described with reference to the accompanying drawings.

[0024] Figure 1 A schematic diagram of the internal structure of an embodiment of the Kava proposed according to the present invention is shown;

[0025] Figure 2a A top view of the cover plate of the clapper according to the present invention is shown.

[0026] Figure 2b A front view schematic diagram of the cover plate of the clapper according to the present invention is shown when it is open;

[0027] Figure 3 A schematic diagram of the structure of the slip clamping a small-sized tube column according to the present invention is shown;

[0028] Figure 4This diagram shows a structural schematic of a clamping device for holding a large-sized tubular column according to the present invention.

[0029] Figure 5a A top view of the cover plate of the clapper according to the present invention is shown when it is closed.

[0030] Figure 5b A front view schematic diagram of the cover plate of the kava according to the present invention is shown when it is closed.

[0031] The reference numerals in the figure are as follows:

[0032] 1. Cover plate; 2. Bearing body; 21. Bearing component; 22. First connecting ear; 23. Second connecting ear; 24. Bearing step; 3. Pipe hole; 4. Straightening plate; 5. Tilting pin; 6. Telescopic cylinder; 7. Guide plate; 8. Jaw; 9. First connecting shaft; 10. Second connecting shaft; 11. Slide rail; 12. Pipe; 100. Locking slip.

[0033] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0034] The invention will now be described with reference to the accompanying drawings.

[0035] It should be noted that the directional terms or qualifiers such as "up" and "down" used in this application are all specific to the referenced [reference]. Figure 1 In other words, they are not used to define the absolute position of the components involved, but can vary depending on the specific circumstances.

[0036] Figure 1 The structure of the Kava 100 according to the present invention is shown. For example... Figure 1 As shown, the Kawa 100 mainly includes a load-bearing body 2, a slide rail 11, a jaw 8, and a telescopic cylinder 6.

[0037] The main body 2 is constructed as a whole and is roughly cylindrical in shape.

[0038] Multiple slide rails 11 are evenly arranged on the inner wall of the support body 2 along the circumferential direction. In this embodiment, the slide rails 11 are fixed to the support body 2 by screws, and the slide rails 11 are inclined relative to the central axis of the support body 2. Furthermore, the extension line of the slide rail 11 in the length direction intersects the central axis of the support body 2.

[0039] The jaws 8 are movably mounted on each slide rail 11, that is, a jaw 8 is movably mounted on each slide rail 11 along its length.

[0040] The telescopic cylinder 6 is used to drive the jaws 8 to move along the slide rail 11.

[0041] In this configuration, since the slide rail 11 is inclined relative to the central axis of the support body 2, when the telescopic cylinder 6 drives the jaws 8 to move along the slide rail 11, the gap between each jaw 8 will change in size, thus making it suitable for tubular columns of different sizes.

[0042] In a specific embodiment, such as Figure 1 , Figure 3 and Figure 4 As shown, six slide rails 11 are evenly spaced along the circumference on the inner wall of the support body 2. Each slide rail 11 is constructed to be inclined relative to the central axis of the support body 2, and the inclination angle of each slide rail 11 is the same, all being shaped to gradually approach the central axis of the support body 2 from top to bottom. That is to say, when the jaws 8 move downward along the slide rails 11, the radial distance between each jaw 8 will gradually decrease. By adjusting the height of the jaws 8 on the slide rails 11, the radial distance between each jaw 8 can be adjusted, thus making it suitable for tubular columns of different sizes.

[0043] Furthermore, each slide rail 11 is equipped with a telescopic cylinder 6, the telescopic end of which is connected to the jaws 8. The telescopic cylinder 6 can drive the jaws 8 to move along the slide rail 11. That is to say, each jaw 8 is individually controlled by a telescopic cylinder 6. Under this configuration, such as Figure 3 As shown, when the radial dimension of the tubing 12 is small, a few jaws 8 move along the slide rail 11. In this embodiment, three of the evenly distributed jaws 8 slide synchronously up and down under the drive of the telescopic cylinder 6, allowing the jaws 8 to slide to a position where they can lock the tubing 12. The few jaws 8 moving closer to the central axis avoid interference between the circumferential sides of adjacent jaws 8, thus allowing the slip 100 to be used with smaller tubing sizes. Figure 4 As shown, when the radial dimension of the tubing 12 is large, all the jaws 8 move along the slide rail 11 and slide together to the outside of the tubing 12 to hold it securely. All the jaws 8 together clamp the tubing 12, resulting in a more secure grip.

[0044] In one specific embodiment, the telescopic cylinder 6 is a hydraulic cylinder. The six telescopic cylinders 6 are controlled by a valve assembly to regulate the internal hydraulic pressure, thereby controlling the movement position of each jaw 8 on the slide rail 11.

[0045] When the jaws 8 of the slip 100 of the present invention slide to the upper part of the slide rail 11, it can accommodate large-sized tubing 12; when the jaws 8 slide to the lower part of the slide rail 11, it can accommodate small-sized tubing 12. In this embodiment, the slip 100 can accommodate tubing ranging from 2-3 / 8 inches to 16 inches without changing the jaws 8.

[0046] Furthermore, in this embodiment, when the size of the tubing 12 is less than 5 inches, such as Figure 3As shown, three clamping teeth 8, arbitrarily distributed circumferentially, can be synchronously clamped under the control of the valve assembly. When the tubing 12 is less than 5 inches, the three clamping teeth 8, arbitrarily controlled to slide synchronously up and down, slide the clamping teeth 8 to a position where they can clamp the tubing 12. At this time, the driving force of the telescopic cylinder 6 is released, and the tubing 12 slides downward under its own weight. At the same time, it drives the three clamping teeth 8 clamping the tubing 12 to slide downward. Since the slide rail 11 of the clamping teeth 8 is designed as a ramp, the closer the distance between the three clamping teeth 8 is when the clamping teeth 8 slide downward, the tighter the clamping teeth 8 clamp the tubing 12, ultimately making the clamping teeth 8 clamp the tubing 12 and prevent it from sliding. When the tubing string 12 does not need to be held by the slip 100, the hoisting system of the drilling rig lifts the tubing string 12. The clamping friction between the tubing string 12 and the jaw 8 causes the jaw 8 to begin to slide upward. As the jaw 8 slides upward, the clamping force between the tubing string 12 and the jaw 8 continuously decreases, and the corresponding friction between the tubing string 12 and the jaw 8 also continuously decreases. When the friction between the tubing string 12 and the jaw 8 is insufficient to support the downward gravity of the jaw 8 itself, the telescopic cylinder 6, under the control of the valve group, simultaneously pushes the three clamping jaws 8 upward until the jaw 8 is completely disengaged from the tubing string 12, and the distance between the three clamping jaws 8 is greater than the outer diameter of the female coupling of the tubing string 12. Finally, the coupling of the tubing string 12 is lifted or lowered until it passes over the jaw 8.

[0047] When the size of the tubing string 12 is greater than or equal to 5 inches, the six clamping teeth 8 clamp synchronously under the control of the valve assembly. For example... Figure 4 As shown, when the tubing 12 is greater than or equal to 5 inches, the telescopic cylinders 6 of the six jaws 8 slide up and down synchronously, so that the jaws 8 slide to a position where they can clamp the tubing 12. At this time, the driving force of the telescopic cylinders 6 is released, and the tubing 12 slides down under its own weight. At the same time, it drives the six jaws 8 that are clamping the tubing 12 to slide down. Since the slide rail 11 of the jaws 8 is designed as a ramp, the closer the distance between the six jaws 8 is when the jaws 8 slide down, the tighter the jaws 8 clamp the tubing 12. Finally, the jaws 8 of the hydraulic slip clamps clamp the tubing 12 and prevent it from sliding. When the tubing string 12 does not need to be held in place by the slips 100, the hoisting system of the drilling rig lifts the tubing string 12. The clamping friction between the tubing string 12 and the jaws 8 causes the jaws 8 to begin to slide upward. As the jaws 8 slide upward, the clamping force between the tubing string 12 and the jaws 8 continuously decreases, and the corresponding friction between the tubing string 12 and the jaws 8 also continuously decreases. When the friction between the tubing string 12 and the jaws 8 is insufficient to support the downward gravity of the jaws 8 themselves, the telescopic cylinder 6, under the control of the valve group, simultaneously pushes the six clamping jaws 8 upward until the jaws 8 are completely disengaged from the tubing string 12, and the distance between the six clamping jaws 8 is greater than the outer diameter of the female coupling of the tubing string 12. Finally, the coupling of the tubing string 12 is lifted or lowered until it passes over the jaws 8.

[0048] According to a preferred embodiment of the present invention, the slide rail 11 is configured to gradually approach the central axis of the support body 2 from top to bottom. In this configuration, after the jaws 8 clamp the tube column 12, under the influence of the tube column 12's gravity and the friction between the tube column 12 and the jaws 8, the tube column 12 provides a downward force to the jaws 8. After the jaws 8 move downward along the slide rail 11, the radial distance between each jaw 8 further decreases, thereby clamping the tube column 12 more securely. Even if the telescopic cylinder 6 fails, the tube column 12 will not detach from the jaws 8 and fall.

[0049] In one specific embodiment, guide plates 7 are provided on the left and right sides of the slide rail 11, and jaws 8 are located between the two guide plates 7. The guide plates 7 can restrict the movement of jaws 8 in the left and right directions, thereby guiding jaws 8.

[0050] In this embodiment, the telescopic cylinder 6 is parallel to the slide rail 11, one end of the telescopic cylinder 6 is connected to the bearing body 2, and the other end is connected to the jaws 8.

[0051] In a preferred embodiment, an openable and closable cover plate 1 is provided at the upper end of the supporting body 2. After opening the cover plate 1, the interior of the slip 100 can be inspected.

[0052] In one specific embodiment, the cover plate 1 is constructed in a semi-circular shape, and the two cover plates 1 are hinged to the upper end of the supporting body 2.

[0053] The middle portion of the arc-shaped edge of the cover plate 1 is hinged to the upper end of the supporting body 2. Specifically, the cover plate 1 is hinged to the supporting body 2 via a flip pin 5, the central axis of which is arranged horizontally. Figure 2a and Figure 2b As shown, the cover plate 1 can rotate about the flip pin 5 as the axis of rotation, thereby exposing the internal structure of the slip 100 for easy inspection. Figure 5a and Figure 5b As shown, when the slip 100 is working, the cover plate 1 is closed at the upper end of the supporting body 2. After the two cover plates 1 are closed, they form a ring shape. That is to say, the central part of the closed cover plate 1 forms a tube hole 3 for accommodating the tube 12, so that the tube 12 can be inserted into the slip 100.

[0054] In a preferred embodiment, such as Figure 2a and Figure 5b As shown, a semi-circular ring-shaped straightening plate 4 is provided on the radial inner side of each cover plate 1. When the two cover plates 1 are closed, the straightening plates 4 on the two cover plates 1 form a ring shape, and the circular hole in the middle of the straightening plate 4 is the pipe hole 3.

[0055] In one specific embodiment, the supporting body 2 includes two semi-cylindrical supporting members 21, which are detachably connected to each other.

[0056] like Figure 1 and Figure 2b As shown, the main body 2 is a symmetrical structure composed of two semi-cylindrical support members 21. Connecting ears are provided on the contact surfaces of the two support members 21, and the connecting shaft passes through the connecting ears of the two support members 21 in the vertical direction, thereby connecting the two support members 21 into a whole.

[0057] Specifically, the connecting lugs include a first connecting lug 22 disposed on the upper part of the support member 21 and a second connecting lug 23 disposed on the lower part of the support member 21. A first connecting shaft 9 and a second connecting shaft 10 are respectively disposed in the first connecting lug 22 and the second connecting lug 23. The first connecting lug 22 is farther away from the central axis of the support body 2 than the second connecting lug 23. In this configuration, the positions of the first connecting lug 22 and the second connecting lug 23 are adapted to the inclination direction of the slide rail 11.

[0058] In a preferred embodiment, a bearing step 24 is designed on the outer axial middle part of the bearing body 2. During operation, the slip 100 sits on the upper surface of the turntable of the drilling platform through the bearing step 24 to bear the load, while reducing the height of the slip 100 above the drilling platform to avoid interference with other equipment on the drilling platform.

[0059] In one specific embodiment, the first connecting shaft 9 is located above the bearing step 24, and the second connecting shaft 10 is located below the bearing step 24.

[0060] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0061] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 invention according to the specific circumstances.

[0062] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A type of kava, characterized in that, include: Supporting body (2); Multiple slide rails (11) are evenly arranged circumferentially within the bearing body (2), and the slide rails (11) are inclined relative to the central axis of the bearing body (2); The jaws (8) are movable and mounted on each of the slide rails (11); and Telescopic cylinder (6) for driving the jaws (8) to move along the slide rail (11).

2. The kava according to claim 1, characterized in that, The extension line of the slide rail (11) intersects the central axis of the supporting body (2).

3. The kava according to claim 2, characterized in that, The slide rail (11) is constructed such that it gradually approaches the central axis of the supporting body (2) from top to bottom.

4. The Kava according to any one of claims 1 to 3, characterized in that, A cover plate (1) that can be opened and closed is provided at the upper end of the supporting body (2).

5. The kava according to claim 4, characterized in that, The cover plate (1) is constructed in a semi-circular shape, and the two cover plates (1) are hinged together at the upper end of the supporting body (2).

6. The kava according to claim 5, characterized in that, A straightening plate (4) is provided on the radial inner side of the cover plate (1).

7. The Kawa according to any one of claims 1 to 3, characterized in that, The supporting body (2) includes two semi-cylindrical supporting members (21), which are detachably connected to each other.

8. The kava according to claim 7, characterized in that, Connecting ears are provided on the contact surfaces of the two bearing members (21), and a connecting shaft is provided inside the connecting ears.

9. The kava according to claim 8, characterized in that, The connecting ear includes a first connecting ear (22) disposed on the upper part of the support member (21) and a second connecting ear (23) disposed on the lower part of the support member (21). A first connecting shaft (9) and a second connecting shaft (10) are respectively disposed in the first connecting ear (22) and the second connecting ear (23). The first connecting ear (22) is farther away from the central axis of the support body (2) than the second connecting ear (23).

10. The Kava according to any one of claims 1 to 3, characterized in that, Each of the jaws (8) corresponds one-to-one with each of the telescopic cylinders (6).

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