A gripping device for tubular string running operations

Abstract

The application provides a clamping device for pipe string single operation, which comprises a tubular body, a first through hole in the body, left and right wing plates arranged on both sides of the first end of the body, and first and second turning plates arranged on the left and right wing plates respectively, and the sides of the first and second turning plates adjacent to each other are configured as symmetrical semicircular surfaces, so that the first and second turning plates jointly form a second through hole communicating with the first through hole. Wherein, the first and second turning plates can be turned on the left and right wing plates, so that the second through hole has a first state of clamping the pipe body and hindering the pipe body from passing through the first and second through holes and a second state of allowing the pipe body to pass through the first and second through holes. The clamping device for pipe string single operation can not only save labor cost, but also improve the reliability of the operation process.

Description

Technical Field

[0001] This invention relates to a clamping device for single-strand tubing operations. Background Technology

[0002] Currently, single-string operation is an essential procedure in oil and gas drilling. Single-string operation refers to connecting multiple tubing strings sequentially above a borehole and placing them into the borehole of the oil well. During this process, clamping equipment needs to be installed on the borehole. This clamping equipment uses a flap to secure the tubing string already placed in the borehole, preventing it from falling to the bottom of the well during the connection process.

[0003] Existing clamping equipment relies on manually controlled flaps, requiring each flap to be opened and closed once for each pipe column to be connected. However, single-pipe column operations typically involve connecting a large number of individual pipe columns, and the flaps require significant external force to open and close. Therefore, existing clamping equipment necessitates multiple workers performing the work for extended periods, resulting in significant time and labor costs.

[0004] In addition, existing clamping devices have poor clamping performance on the tubing, easily causing it to fall prematurely into the bottom of the rat hole. Furthermore, existing clamping devices cannot provide counter-torque to the clamped tubing, causing the clamped tubing to rotate in the same direction under the influence of the connecting tubing when two tubings are connected, which is detrimental to the threaded connection between the tubings. These problems result in low reliability of existing clamping devices. Summary of the Invention

[0005] In view of the technical problems mentioned above, the present invention aims to provide a clamping device for single-column operations. This device can not only save labor costs, but also improve the reliability of the operation process.

[0006] According to the present invention, a clamping device for single-column pipe operation is provided, comprising: a tubular body having a first through hole, and a left wing plate and a right wing plate disposed on both sides of a first end of the body; and a first flap and a second flap respectively disposed on the left wing plate and the right wing plate, wherein the adjacent sides of the first flap and the second flap are constructed as symmetrical semi-circular arc surfaces, such that the first flap and the second flap together form a second through hole communicating with the first through hole.

[0007] The first and second flaps can be flipped on the left and right wing plates, so that the second through hole has a first state that holds the tube body and prevents the tube body from passing through the first and second through holes, and a second state that allows the tube body to pass through the first and second through holes.

[0008] In a preferred embodiment, the system further includes a first flip platform and a second flip platform respectively hinged to the left wing plate and the right wing plate, with the free ends of the first flip platform and the second flip platform respectively connected to the first flip plate and the second flip plate.

[0009] In a preferred embodiment, the left and right wing plates are respectively provided with power generating devices capable of controlling the rotation of the first and second tilting platforms.

[0010] In a preferred embodiment, the first flap and the second flap are respectively formed with the left wing plate and the right wing plate, and the free ends of the first flip platform and the second flip platform extend into the first gap and the second gap and extend to the side of the first flap and the second flap, respectively.

[0011] In a preferred embodiment, at least one positioning element is provided between the first flap and the first tilting table, and between the second flap and the second tilting table.

[0012] In a preferred embodiment, a clamping layer is further provided on the inner wall of the first through hole.

[0013] In a preferred embodiment, a base plate is further provided at the second end of the body, the base plate having a connector for connecting to the oil well rat hole.

[0014] In a preferred embodiment, an elastic element is further provided on the outer wall of the body, and the left wing plate and the right wing plate have a fixed part that is fixedly connected to the base plate and a movable part that is connected to the base plate through the elastic element.

[0015] In a preferred embodiment, pin mounting grooves are further provided on the left and right wing plates, and the first and second flipping tables are hinged to the left and right wing plates respectively via rotating shafts installed in the mounting grooves.

[0016] In a preferred embodiment, the power generating device is a cylinder. Attached Figure Description

[0017] The present invention will now be described with reference to the accompanying drawings.

[0018] Figure 1 A schematic diagram of a clamping device for single-string operations according to the present invention is shown.

[0019] Figure 2 for Figure 1 The diagram shown is a schematic of the clamping device used for single-column operations in the working state.

[0020] 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

[0021] The invention will now be described with reference to the accompanying drawings.

[0022] Figure 1 A clamping device 100 for single-string operation according to an embodiment of the present invention is shown. Figure 1 As shown, the clamping device 100 for single-section tubing operation includes a body 10. The body 10 is tubular in shape, and a first through hole 15 is formed within the body 10. The first through hole 15 is used to accommodate a single tubing section (not shown).

[0023] like Figure 1 As shown, a left wing plate 20 and a right wing plate 30 are symmetrically arranged on both sides of the first end 11 of the main body 10. A first flap 21 and a second flap 31 are also respectively provided on the left wing plate 20 and the right wing plate 30. The adjacent side surfaces 211 of the first flap 21 and the second flap 31 are constructed as symmetrical semi-circular arc surfaces. Thus, a roughly circular second through hole 25 is formed between the first flap 21 and the second flap 31, and the second through hole 25 communicates with the first through hole 15.

[0024] In this invention, when the first flap 21 and the second flap 31 are in a horizontal state, the diameter of the second through hole 25 is set to be slightly smaller than the diameter of a single tube. It is easy to understand that as the first flap 21 and the second flap 31 rotate from a horizontal state to a vertical state, the diameter of the second through hole 25 gradually increases.

[0025] During the rotation of the first flap 21 and the second flap 31, when the diameter of the second through hole 25 is the same as that of the single tube, the first flap 21 and the second flap 31 will tilt and abut against the single tube, fixing it under the weight of the single tube. When the diameter of the second through hole 25 is larger than the diameter of the single tube, the single tube can pass through the second through hole 25 normally to reach the first through hole 15. Thus, the second through hole 22 has a first state of holding the single tube in place, preventing it from passing through the first through hole 15 and the second through hole 25, and a second state of allowing the single tube to pass through the first through hole 15 and the second through hole 25.

[0026] Figure 2 for Figure 1 As shown Figure 1 The diagram shows a rotating clamping device 100 used for single-strand tubing operations. Figure 2As shown, a first rotating platform 22 and a second rotating platform 32 are respectively provided on the left wing plate 20 and the right wing plate 30. Specifically, a first groove 23 and a second groove 33 are respectively provided on the left wing plate 20 and the right wing plate 30 in a horizontal direction. A rotating shaft 231 is respectively provided in the first groove 23 and the second groove 33. The fixed ends 221 of the first rotating platform 22 and the second rotating platform 32 are respectively connected to the left wing plate 20 and the right wing plate 30 through the rotating shaft 231, thereby enabling the first rotating platform 22 and the second rotating platform 32 to rotate around the rotating shaft 231 in a direction closer to the first end 11 of the body 10.

[0027] Simultaneously, the first flap 21 and the second flap 31 form first gaps 24 and 34 with the left wing plate 22 and the right wing plate 32, respectively. The free ends 222 of the first flip platform 22 and the second flip platform 32 extend into the first gaps 24 and 34, respectively, and extend to the side surfaces 211 of the first flap 20 and the second flap 30. Thus, when the first flip platform 22 and the second flip platform 32 rotate toward the first end 11 of the main body 10, they can drive the first flap 21 and the second flap 31 to rotate synchronously.

[0028] like Figure 1 As shown, power generating devices 26 are respectively provided on the left wing plate 20 and the right wing plate 30. The power generating device 26 is preferably provided with a cylinder. The power generating device 26 can control the rotation of the first tilting platform 22 and the second tilting platform 32, thereby controlling the tilting of the first flip plate 21 and the second flip plate 31.

[0029] In this invention, the power generating device 26 is connected to a controller (not shown) via a transmission line, which allows remote control of the first flap 21 and the second flap 31. This avoids workers operating the device on-site during single-column work, thus reducing safety risks for workers.

[0030] In a preferred embodiment, at least one positioning element 28 is further provided between the first flip plate 21 and the first tilting table 22. The positioning element 28 includes a boss 281 disposed on the first tilting table 22 and a cylinder 282 disposed on the first flip plate 21. The boss 281 can extend into the cylinder 282, causing the boss 281 and the cylinder 282 to engage, thereby fixing and limiting the first flip plate 21. This ensures that the relative position of the first flip plate 21 and the first tilting table 22 remains constant during repeated tilting processes, which helps improve the control accuracy of the clamping device 100 for single-column operations.

[0031] like Figure 1As shown, in a preferred embodiment, a clamping layer 151 is further provided on the inner wall of the first through hole 15. The clamping layer 151 can increase the friction between the tubing and the inner wall of the first through hole 15, thereby providing a counter-torque for the rotation of the tubing and preventing the tubing from rotating in the first through hole 15. With this arrangement, it is possible to effectively prevent the tubing located above the second through hole 25 (i.e., the side away from the first through hole 15) from rotating and causing the tubing below the second through hole 25 (i.e., the side close to the first through hole 15) to rotate, thereby facilitating the connection of the two tubing located above and below the second through hole 25 together by rotation using threads.

[0032] like Figure 1 As shown, a base plate 50 is also provided at the second end 12 of the main body 10. The base plate 50 has a connector 51 that connects to the well hole. The connector 51 is preferably a flange. The clamping device 100 for single-string tubing operation can be detachably connected to the well hole via the connector 51.

[0033] like Figure 1 As shown, an elastic element 60 is also provided on the outer wall of the main body 10. Simultaneously, a semi-cylindrical arc plate 65 is fitted onto the outer wall of the elastic element 60. The left wing plate 20 and the right wing plate 30 are connected to the base plate 50 via the elastic element 60 and the arc plate 65. Specifically, the left wing plate 20 and the right wing plate 30 have a fixed portion that is fixedly connected to the base plate 50 via the arc plate 65, and a movable portion that is connected to the base plate 50 via the elastic element 60.

[0034] When the first flap 21 and the second flap 31 abut against the tube column to clamp and fix it, the tube column will exert a vertically downward pressure on the first flap 21 and the second flap 31 under the action of gravity. Under this pressure, the elastic element 60 will elastically deform, causing the movable parts of the left wing plate 20 and the right wing plate 30 to move downward. At this time, since the fixed parts of the left wing plate 20 and the right wing plate 30 remain in the vertical direction and do not move, the entire left wing plate 20 and the right wing plate 30 will be in a slightly tilted state, thereby causing the second through hole 25 to be in a slightly tilted state.

[0035] Since the tubing inside the second through-hole 25 is always in a vertical position, the inclined second through-hole 25 exerts a squeezing effect on the tubing. Through this structure, the weight of the tubing can be converted into a squeezing force of the second through-hole 25 on the tubing, thereby further increasing the clamping effect of the second through-hole 25 on the tubing.

[0036] When the tubing needs to move within the second through hole 25, simply adjust the power generating device 26 to increase the diameter of the second through hole 25. At this time, under the combined action of the power generating device 26 and the elastic element 60, the left wing plate 20 and the right wing plate 30 will return to a horizontal state.

[0037] The following is a brief description of the operation of the clamping device 100 for single-column operation according to the present invention.

[0038] When single-string operations are required, the base plate 50 is first fixed to the wellbore's rat hole via connector 51. Then, a crane is used to lower the first tubing string into the rat hole. Subsequently, the power generator 26 controls the rotation of the first flap 21 and the second flap 31, causing them to abut against the tubing string. At this point, under the weight of the tubing string, the first flap 21 and the second flap 31 will be tilted, further securing the tubing string.

[0039] Once the first tubing is fixed within the second through hole 25, the second tubing can be connected to the first tubing via threads. During the rotation of the second tubing, the jaw layer 151 on the inner wall of the first through hole 15 provides counter-torque to the first tubing, preventing it from rotating with the second tubing and thus affecting the normal connection between the tubing.

[0040] Once the second tube column is connected, the power generator 26 controls the first flap 21 and the second flap 31 to rotate in opposite directions, so that the first flap 21 and the second flap 31 no longer abut against the tube column. At this point, the second tube column can be lowered normally to the second through hole 25. The power generator 26 then re-secures the second tube column. The third tube column can then be installed on the second tube column.

[0041] Repeat this installation process until all individual tubing columns are installed. Once all individual tubing columns are installed, the clamping device 100 for individual tubing column operations can be removed. The entire individual tubing column operation is now complete.

[0042] 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 clamping device for single-strand tubing operation, comprising: A tubular body (10) having a first through hole (15) inside, and a left wing plate (20) and a right wing plate (30) provided on both sides of the first end of the body, and, A first flap (21) and a second flap (31) are respectively installed on the left wing plate and the right wing plate. The adjacent side surfaces (211) of the first flap and the second flap are constructed as symmetrical semi-circular arc surfaces, so that the first flap and the second flap together form a second through hole (25) that is connected to the first through hole. A base plate (50) is provided at the second end of the main body. The base plate has a connector (51) that connects to the oil well rat hole. An elastic element (60) is also provided on the outer wall of the main body. A semi-cylindrical arc plate (65) is also fitted on the outer wall of the elastic element. The left wing plate and the right wing plate are connected to the base plate through the elastic element and the arc plate. The left wing plate and the right wing plate have a fixed part that is fixedly connected to the base plate through the arc plate and a movable part that is connected to the base plate through the elastic element. The first and second flaps are capable of flipping on the left and right wing plates, respectively, so that the second through hole has a first state that holds the tube body and prevents the tube body from passing through the first and second through holes, and a second state that allows the tube body to pass through the first and second through holes. When the first and second flaps abut against the tubular column to clamp and fix it, the tubular column will exert a vertically downward pressure on the first and second flaps under the action of gravity. Under this pressure, the elastic element will elastically deform, causing the movable parts of the left and right wing plates to move downward. At this time, since the fixed parts of the left and right wing plates remain in the vertical direction and do not move, the left and right wing plates will be in a slightly tilted state, which in turn causes the second through hole to be in a slightly tilted state, exerting a squeezing effect on the tubular column. The clamping device for single-column operation also includes a first flipping table (22) and a second flipping table (32) respectively hinged to the left wing plate and the right wing plate. The free ends of the first flipping table and the second flipping table are respectively connected to the first flap plate and the second flap plate. At least one positioning element (28) is also provided between the first flap plate and the first flipping table and between the second flap plate and the second flipping table.

2. The clamping device for single-section tubing operation according to claim 1, characterized in that, Power generating devices (26) capable of controlling the rotation of the first and second tilting platforms are respectively provided on the left and right wing plates.

3. The clamping device for single-strand tubing operation according to claim 2, characterized in that, The first flap and the second flap are respectively formed with the left wing plate and the right wing plate, forming a first gap (24) and a second gap (34). The free ends of the first flipping platform and the second flipping platform extend into the first gap and the second gap respectively and extend to the side of the first flap and the second flap respectively.

4. The clamping device for single-strand tubing operation according to any one of claims 1 to 3, characterized in that, A clamping layer (151) is also provided on the inner wall of the first through hole.

5. The clamping device for single-strand tubing operation according to any one of claims 1 to 3, characterized in that, Pin mounting grooves (23) are provided on the left and right wing plates. The first and second flipping tables are hinged to the left and right wing plates respectively by a rotating shaft (231) installed in the mounting groove.

6. The clamping device for single-strand tubing operation according to claim 2 or 3, characterized in that, The power generating device is a cylinder.

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