Power casing tongs

Abstract

The invention belongs to the technical field of petroleum drilling, and particularly relates to a power casing wrench. The power casing tong comprises a combined tong and a moving mechanism, the moving mechanism is arranged to be capable of driving the combined tong to move in the horizontal direction and the vertical direction so that the combined tong can be aligned to a well mouth, and the combined tong comprises a buckle guiding device, a main tong, a buckling device and a back-up tong which are sequentially and coaxially arranged from top to bottom. The buckle guiding device is fixedly connected with the main clamp, the buckling device is fixedly connected with the back-up clamp, the main clamp can axially move relative to the moving mechanism, and the back-up clamp can axially move relative to the main clamp.

Description

Technical Field

[0001] The invention belongs to the technical field of oil drilling, and in particular relates to a power casing tongs. Background Art

[0002] Drilling rig automation technology is an important means to improve the level of drilling rig automation, enhance drilling rig performance, and improve the inherent safety of drilling operations. At present, with the large-scale application of drilling rig automation equipment such as power catwalks and buffer manipulators, the casing operation at the drilling site has realized the automation of casing transportation from the ground to the wellhead on the drilling platform. However, in the process of lowering the casing after lifting it and connecting it with the casing in the wellbore, the site still uses traditional operation methods, requiring multiple drillers to cooperate to complete the casing alignment and centering, and manually operate the casing clamp to buckle it. Improper operation can easily cause accidents such as damage to the buckle and wrong buckle.

[0003] For conventional drilling rig casing lowering operations, the currently used power casing tongs are used to make and break out the casing, and manual assistance is required when the casing is buckled. New drilling rigs are generally equipped with casing straightening platforms, and operators stand on the straightening platforms to manually straighten the casing, which has a poor effect. In conventional casing lowering operations, multiple drillers are required to cooperate to complete the casing straightening and centering, which has the problems of high labor intensity, large number of personnel, high safety risks, and low degree of automation. Summary of the invention

[0004] In view of the above-mentioned technical problems, the present invention aims to provide a power casing tongs, which can solve at least one of the above-mentioned problems.

[0005] According to the present invention, a power casing tongs is provided, comprising a combination tongs and a moving mechanism.

[0006] The moving mechanism is configured to drive the combination clamp to move in the horizontal direction and the vertical direction, so that the combination clamp is aligned with the wellhead.

[0007] The combination pliers include a lock puller, a main pliers, a counter lock and a backup pliers which are coaxially arranged in sequence from top to bottom. The lock puller is fixedly connected to the main pliers, the counter lock and the backup pliers are fixedly connected, the main pliers are configured to be able to move axially relative to the moving mechanism, and the backup pliers are configured to be able to move axially relative to the main pliers.

[0008] In a specific embodiment, the forward latch and the reverse latch of the main pliers are hinged to a connecting rod, the middle position of the connecting rod is set as a rotating pair, and a switching cylinder is arranged above the forward latch and / or the reverse latch of the main pliers, and the telescopic end of the switching cylinder can drive the forward latch and the reverse latch to move up and down.

[0009] In a specific embodiment, a shift cylinder is arranged above the shift pin of the master caliper, and the telescopic end of the shift cylinder can drive the shift pin to move up and down.

[0010] In a specific embodiment, the moving mechanism includes a guide rail arranged in a horizontal direction and a gantry slidably arranged on the guide rail, and a proximity switch is arranged on the gantry. The proximity switch is configured to stop moving when the gantry moves to the point where the combination clamp is aligned with the wellhead.

[0011] In a specific embodiment, the gantry includes a walking leg movably connected to the guide rail, a vertical beam fixedly arranged on the walking leg, and a horizontal beam movably arranged on the vertical beam along the vertical direction, and the combination clamp is connected to the horizontal beam.

[0012] In a specific embodiment, an infrared scanning sensor is provided on the backup tong, and the infrared scanning sensor is configured to scan the positions of the backup tong and the wellhead casing coupling, so that the backup tong clamps the wellhead casing coupling; a torque sensor is provided on the main tong, and the torque sensor is configured to measure the make-up torque, so as to detect whether the make-up is normal; a notch sensor is installed on the jaws of the main tongs, and the notch sensor is configured to measure whether the notch of the jaws is aligned with the opening of the main tongs.

[0013] In a specific embodiment, the main pliers is connected to the moving mechanism via a spring barrel, the upper end of the spring barrel is hinged to the moving mechanism, and the lower end of the spring barrel is fixedly connected to the main pliers.

[0014] In a specific embodiment, a guide rod is provided at the lower end of the main tongs, the backup tongs are movably connected to the guide rod, a compression spring is sleeved on the guide rod, the upper end of the compression spring is axially abutted against the backup tongs, and the lower end of the compression spring is axially abutted against the guide rod.

[0015] In a specific embodiment, the buckle puller and the buckle matcher both include a fixed body and two clamping rods symmetrically and movably arranged on the fixed body, a first connecting rod is rotatably arranged on the fixed body, the rotation center of the first connecting rod is located on the symmetry line of the two clamping rods, the two ends of the first connecting rod are respectively hinged to the two clamping rods through the second connecting rod, a telescopic cylinder is hinged on one of the clamping rods, and the other end of the telescopic cylinder is connected to the hinge point of the first connecting rod and the second connecting rod.

[0016] In a specific embodiment, a position sensor is provided on the clamp rod, and the position sensor is configured to measure the distance between the two clamp rods, so as to determine whether the buckle puller and the buckle engaging device are closed.

[0017] Compared with the prior art, the advantages of this application are:

[0018] The present invention can realize the automation of automatic centering, buckling and integrated control technology of casing running. No human intervention is required at the equipment handover point, and the entire casing running operation process from the ground to the wellhead is fully automated; the automation degree and safety level of the drilling rig are improved, the safety risk of the operation is reduced, and the labor intensity of the workers is alleviated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be described below with reference to the accompanying drawings.

[0020] Figure 1 A front view of an embodiment of a power casing tong according to the present invention is shown;

[0021] Figure 2 A left side view of an embodiment of a power casing tong according to the present invention is shown;

[0022] Figure 3 It shows a schematic diagram of the structure inside the vertical beam according to the present invention;

[0023] Figure 4 Shows a front view of a button puller according to the present invention;

[0024] Figure 5 Shows a top view of a button puller according to the present invention;

[0025] Figure 6 A top view of a buckle according to the present invention is shown;

[0026] Figure 7 It shows a schematic structural diagram of the main clamp according to the present invention;

[0027] Figure 8 A schematic diagram showing a switching module according to the present invention is shown;

[0028] Fig. 9 shows a schematic diagram of a shift module according to the present invention;

[0029] Fig.10 It shows a schematic structural diagram of a back-up clamp according to the present invention;

[0030] Fig.11 A schematic diagram showing the positions of a torque sensor and an infrared scanning sensor according to the present invention;

[0031] Fig.12 A schematic diagram showing the position of the infrared scanning sensor according to the present invention is shown;

[0032] Fig.13 A schematic diagram of the structure of a notch sensor according to the present invention is shown;

[0033] Fig.14 for Fig.13 Top view of the .

[0034] In the figure: 1. Combination pliers; 2. Moving mechanism; 3. Motor; 4. Speed ​​reducer; 5. Crossbeam; 6. Spring cylinder; 7. Vertical beam; 8. Walking legs; 81. Limit block; 9. Latch guide; 91. Latch guide cylinder; 10. Main pliers; 11. Latch guide; 111. Latch clamp; 12. Back pliers; 13. Guide rail; 14. Gantry; 15. Lead screw; 16. Guide wheel; 19. Position sensor; 20. Pliers teeth; 22. Notch sensor; 23. Infrared scanning sensor; 25. Torque sensor ; 40. Switching module; 41. Connecting rod; 42. Switching cylinder; 43. Forward latch; 44. Reverse latch; 45. Cylinder fixing bracket; 46. Connecting rod fixing bracket; 47. Switching pressure block; 50. Shifting module; 51. Shifting latch; 52. Shifting cylinder; 53. Support; 54. Shifting rod; 61. Fixed body; 62. Clamping rod; 63. First connecting rod; 64. Second connecting rod; 65. Telescopic cylinder; 71. Guide rod; 72. Compression spring; 100. Power casing pliers.

[0035] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0036] The present invention will be described below with reference to the accompanying drawings.

[0037] It should be noted that the directional terms or qualifiers "upper", "lower", "front", "rear", "left", "right", etc. used in this application are all with reference to the drawings to which they are referred. They are not used to limit the absolute positions of the components involved, but can be changed according to specific circumstances.

[0038] Figure 1 The structure of the power casing tongs 100 according to the present invention is shown. Figure 1 As shown, the power casing tongs 100 include a combination tongs 1 and a moving mechanism 2, wherein the moving mechanism 2 is configured to drive the combination tongs 1 to move in the horizontal direction and the vertical direction, so that the combination tongs 1 are aligned with the wellhead. Figure 2 As shown, the combination pliers 1 includes a puller 9, a main pliers 10, a counter-lock 11 and a back-up pliers 12 which are coaxially arranged from top to bottom. The puller 9 and the main pliers 10 are fixedly connected, the counter-lock 11 and the back-up pliers 12 are fixedly connected, the main pliers 10 is configured to be able to move axially relative to the moving mechanism 2, and the back-up pliers 12 is configured to be able to move axially relative to the main pliers 10.

[0039] During operation, the moving mechanism 2 drives the combination tongs 1 to move in the horizontal direction, thereby moving the combination tongs 1 to just above the wellhead (not shown).

[0040] Then the moving mechanism 2 drives the combination tongs 1 to move in the vertical direction, so that the backup tongs 12 of the combination tongs 1 clamp the coupling (not shown) of the wellhead casing.

[0041] Afterwards, the casing to be connected (not shown) passes through the lead-in device 9, the main clamp 10 and the buckle device 11 from top to bottom. A funnel-shaped lead-in tube 91 is provided on the lead-in device 9. The lead-in tube 91 can guide the casing to be connected during its downward movement, so that the casing can be automatically centered, so that the casing can smoothly enter the main clamp 10 and the buckle device 11. The buckle device 11 can automatically align the casing to be connected again, so that the lower end of the casing to be connected is aligned with the wellhead casing coupling.

[0042] Subsequently, the main tongs 10 clamp the casing to be connected and drive the casing to rotate, so that the casing to be connected is tightened with the wellhead casing coupling to complete the connection. In the process of the main tongs 10 driving the casing to be connected to the wellhead casing coupling, due to the threaded connection, the main tongs 10 will move downward with the casing to be connected. Therefore, the main tongs 10 are configured to be able to move up and down relative to the moving mechanism 2 and the backup tongs 12, so that the casing can be connected normally.

[0043] According to the present invention, in a specific embodiment, Figure 1 and Figure 2 As shown, the mobile mechanism 2 adopts a frame-type transport frame, and the mobile mechanism 2 includes a guide rail 13 arranged in the horizontal direction and a gantry 14 slidably arranged on the guide rail 13. The guide rail 13 adopts a quick-release type, so as to facilitate the transportation and lifting of the present invention. A proximity switch (not shown) is arranged on the gantry 14, and the proximity switch is configured to stop the gantry 14 from moving when the gantry 14 moves to the point where the combination clamp 1 is aligned with the wellhead.

[0044] In a preferred embodiment, a hoisting pile is welded on the gantry 14 to facilitate transportation and hoisting. An electrical and hydraulic plug interface is provided at the tail of the gantry 14, and the electrical and hydraulic plug interface is transferred to the gantry 14 through a drag chain.

[0045] Furthermore, the gantry 14 includes a walking leg 8 movably connected to the guide rail 13 , a vertical beam 7 fixedly arranged on the walking leg 8 , and a horizontal beam 5 movably arranged on the vertical beam 7 along the vertical direction, and the combination clamp 1 is connected to the horizontal beam 5 .

[0046] Two mutually parallel guide rails 13 are fixedly arranged in the horizontal direction, and a walking leg 8 is arranged on each of the guide rails 13. At the bottom of the walking leg 8, a plurality of limit blocks 81 adapted to the guide rails 13 are arranged along the length direction of the rails 13 to enhance the stability of the walking leg 8. Preferably, the limit blocks 81 and the walking leg 8 are respectively abutted on the upper and lower sides of the guide rails 13, so as to prevent the walking leg 8 from leaving the rails 13.

[0047] In a preferred embodiment, the walking leg 8 and the track 13 cooperate with each other through a gear rack connection, so that they can cooperate with the proximity switch to make the moving position of the walking leg 8 more accurate.

[0048] A vertical beam 7 is fixedly arranged on each walking leg 8, and a cross beam 5 connects two vertical beams 7, and the cross beam 5 can move up and down along the vertical beams 7. Figure 1 and Figure 3 As shown, a motor 3 and a reducer 4 are fixedly arranged at the upper ends of the two vertical beams 7, and the motor 3 and the reducer 4 are connected by a transmission shaft. A lead screw 15 is rotatably arranged in the vertical direction through a guide wheel 16 inside the vertical beam 7, and the lead screw 15 is connected to the reducer 4. The cross beam 5 is arranged on the lead screw 15 by a threaded connection. After the motor 3 is started, the lead screw 15 is driven to rotate through the reducer 4, thereby controlling the cross beam 5 to move in the vertical direction.

[0049] According to the present invention, Figure 1 and Figure 2 As shown, the main pliers 10 is connected to the mobile mechanism 2 through a spring barrel 6, the upper end of the spring barrel 6 is hinged to the mobile mechanism 2, and the lower end of the spring barrel 6 is fixedly connected to the main pliers 10. In a specific embodiment, the spring barrel 6 includes two axially sliding sleeve cylinders, and the two cylinders are connected by a spring, so that the two cylinders can be axially moved and reset. For the convenience of distinction, the two cylinders are named as the first cylinder and the second cylinder, respectively. The upper end of the first cylinder is hinged to the crossbeam 5 of the mobile mechanism 2, and the hinge axis is arranged in the horizontal direction and perpendicular to the track 13. The first cylinder and the second cylinder are slidably sleeved with each other, a spring is arranged between the first cylinder and the second cylinder, the second cylinder is located below the first cylinder, and the lower end of the second cylinder is fixedly connected to the main pliers 10. With this arrangement, when the main tongs 10 drives the casing to be connected to rotate and connect with the wellhead casing coupling, the main tongs 10 can move downward relative to the crossbeam 5, so that the casing to be connected can be smoothly connected with the wellhead casing coupling. After the main tongs 10 releases the casing, the main tongs 10 can be reset under the action of the spring tube 6.

[0050] A guide rod 71 is fixedly provided at the lower part of the main clamp 10. Figure 1As shown, two guide rods 71 ​​are symmetrically arranged on the left and right sides of the lower part of the main tongs 10, and the central axis of the guide rods 71 ​​is arranged in the vertical direction. The backup tongs 12 are movably connected to the guide rods 71, that is, the backup tongs 12 can move up and down along the guide rods 71, and a compression spring 72 is sleeved on the guide rods 71, and the upper end of the compression spring 72 is axially abutted against the backup tongs 12, and the lower end of the compression spring 72 is axially abutted against the guide rods 71. Under this arrangement, when the main tongs 10 drives the casing to be connected to rotate and connect with the wellhead casing coupling, the backup tongs 12 and the wellhead casing coupling are relatively fixed, and the main tongs 10 can move downward relative to the backup tongs 12, so that the casing to be connected is smoothly connected with the wellhead casing coupling.

[0051] According to the present invention, the structures of the buckle puller 9 and the buckle aligner 11 are similar. Figure 4 and Figure 5 It is the front view and top view of the button puller 9, Figure 6 It is a top view of the buckle device 11.

[0052] In a specific embodiment, Figure 4 and Figure 5 As shown, the buckle puller 9 includes a horizontally arranged fixed body 61, combined with Figure 1The central axis of the fixed body 61 is perpendicular to the length direction of the guide rail 13, and two clamping rods 62 are symmetrically arranged on the fixed body 61, and both clamping rods 62 can move along the central axis direction of the fixed body 61. The buckle puller 9 also includes a first connecting rod 63, a second connecting rod 64 and a telescopic oil cylinder 65, wherein a revolving pair is arranged at the middle position of the first connecting rod 63, and the position of the revolving pair is fixed relative to the position of the fixed body 61, the two second connecting rods 64 are respectively hinged at the two ends of the first connecting rod 63, and the ends of the two second connecting rods 64 away from the first connecting rod 63 are respectively hinged to the two clamping rods 62, one end of the telescopic oil cylinder 65 is hinged relative to the fixed body 61, and the other end of the telescopic oil cylinder 65 is hinged at the hinge of the first connecting rod 63 and the second connecting rod 64. A buckle cylinder 91 is fixedly arranged at the upper end of the clamp rod 62. Specifically, the buckle cylinder 91 is constructed in a cone shape as a whole. In this embodiment, the buckle cylinder 91 is divided into two parts of the same shape along the central axis surface, and is fixedly arranged on two clamp rods 62 respectively, forming a left-right symmetrical structure. When the two clamp rods 62 are close to each other, the two clamp rods 62 can drive the two parts of the buckle cylinder 91 to approach each other, forming a buckle cylinder 91 in the shape of a cone. Under this setting, the first connecting rod 63 can be driven to rotate through the extension and contraction of the telescopic cylinder 65, and the two clamp rods 62 can be driven to approach or move away synchronously through the second connecting rod 64, thereby controlling the two parts of the buckle cylinder 91 to engage with each other or move away from each other. When the two parts of the buckle cylinder 91 are away from each other, the buckle cylinder 91 is in an open state with a large diameter, which is conducive to the entry of the sleeve to be connected. After the casing to be connected enters the buckle cylinder 91, when it is necessary to center the main pliers 10, the two parts of the buckle cylinder 91 approach each other and buckle together to form a conical buckle cylinder 91, so that the center axis of the casing to be connected coincides with the center axis of the buckle cylinder 91, thereby realizing the centering of the casing and the main pliers 10, so that the casing to be connected can pass through the main pliers 10 smoothly.

[0053] like Figure 6 As shown, the structure of the buckle 11 is similar to that of the buckle guide 9. The buckle 11 includes a horizontally arranged fixed body 61, combined with Figure 1The central axis of the fixed body 61 is perpendicular to the length direction of the guide rail 13, and two clamping rods 62 are symmetrically arranged on the fixed body 61, and both clamping rods 62 can move along the central axis direction of the fixed body 61. The buckle puller 9 also includes a first connecting rod 63, a second connecting rod 64 and a telescopic cylinder 65, wherein a revolving pair is arranged at the middle position of the first connecting rod 63, and the position of the revolving pair is fixed relative to the position of the fixed body 61, the two second connecting rods 64 are respectively hinged at the two ends of the first connecting rod 63, and the ends of the two second connecting rods 64 away from the first connecting rod 63 are respectively hinged to the two clamping rods 62, one end of the telescopic cylinder 65 is hinged relative to the fixed body 61, and the other end of the telescopic cylinder 65 is hinged at the hinge of the first connecting rod 63 and the second connecting rod 64. A snap clamp 111 is fixedly provided at the end of the clamp rod 62. Specifically, the snap clamp 111 is arc-shaped as a whole. In the present embodiment, the snap clamp 111 includes two semi-arc-shaped parts that are symmetrical on the left and right, and are respectively provided on the two clamp rods 62 to form a bilaterally symmetrical structure. When the two clamp rods 62 are close to each other, the two clamp rods 62 can drive the two parts of the snap clamp 111 to be close to each other, so that the sleeve to be connected is aligned. Under this setting, the first connecting rod 63 can be driven to rotate by the extension and contraction of the telescopic cylinder 65, and the two clamp rods 62 can be driven to be synchronously close or far away by the second connecting rod 64, thereby controlling the two parts of the snap clamp 111 to be mutually engaged or far away. When the two parts of the snap clamp 111 are far away from each other, the snap clamp 111 is in an open state, and the diameter is large, which is conducive to the entry of the sleeve to be connected. After the casing to be connected enters the snap clamp 111, when it is necessary to align the back-up clamp 12, the two parts of the snap clamp 111 are moved closer to each other so that the center axis of the casing to be connected coincides with the center axis of the snap clamp 111, thereby achieving the centering of the casing and the back-up clamp 12, so that the casing to be connected can pass through the back-up clamp 12 smoothly.

[0054] In another preferred embodiment, after the buckle 11 and the buckle guide 9 are closed, the casing to be connected enters the buckle guide, the main pliers, the buckle and the coupling from top to bottom.

[0055] In a preferred embodiment, a position sensor 19 is provided on the clamping rod 62 of the lock puller 9 and the lock pair 11, and the position sensor 19 is configured to measure the distance between the two clamping rods 62, so as to determine whether the lock puller 9 and the lock pair 11 are closed.

[0056] In a preferred embodiment, a pressure sensor is installed on the oil inlet pipeline of the telescopic cylinder 65 of the buckle puller 9 and the buckle coupler 11. The oil pressure in the oil inlet pipeline is detected by the pressure sensor, and the pressure of the telescopic cylinder 65 is thereby known. When the pressure reaches the set value, the pressurization is stopped, thereby judging that the buckle puller 9 and the buckle coupler 11 are closed.

[0057] like Figure 2 and Figure 7 As shown, a switching module 40 is provided on the main pliers 10, and the switching module 40 can switch the rotation direction of the rotating mechanism in the main pliers 10. Specifically, as Figure 8 As shown, a forward latch 43 and a reverse latch 44 that can move up and down are provided on the main tongs 10. By pressing the forward latch 43 and the reverse latch 44 downward, the rotation direction of the internal rotating mechanism of the main tongs 10 can be switched. This part of the structure is a prior art and will not be described in detail here. The switching module 40 includes a connecting rod 41 provided on the main tongs 10 through a connecting rod fixing frame 46. The connecting rod fixing frame 46 is fixedly connected to the main tongs 10. The connecting rod 41 is hinged to the connecting rod fixing frame 46. The hinge point of the connecting rod 41 and the connecting rod fixing frame 46 is located between the forward latch 43 and the reverse latch 44. The axial ends of the connecting rod 41 are hinged to the forward latch 43 and the reverse latch 44 respectively. By providing the connecting rod 41, when the forward latch 43 is pressed downward, the reverse latch 44 moves upward, and when the reverse latch 44 is pressed downward, the forward latch 43 moves upward. A cylinder fixing frame 45 is also fixedly provided on the master pliers 10 , and two switching cylinders 42 are fixedly provided on the cylinder fixing frame 45 . The two switching cylinders 42 are respectively located above a forward latch 43 and a reverse latch 44 . A switching pressure block 47 for pressing is provided at the telescopic end of the switching cylinder 42 .

[0058] By providing the switching module 40 , the rotation direction of the internal rotating mechanism of the main pliers 10 can be switched without manually pressing the forward latch 43 and the reverse latch 44 , thereby avoiding manual contact and improving safety and automation.

[0059] like Figure 2 As shown, a shift module 50 is provided on the main pliers 10, and the shift module 50 can switch the speed of the rotating mechanism in the main pliers 10 to a high or low gear. Fig. 9 As shown, a shift pin 51 capable of moving up and down is provided on the main pliers 10, and the shift pin 51 can switch gears by moving up and down. This part of the structure is a prior art and will not be described in detail here. The shift module 50 includes a shift cylinder 52 disposed above the shift pin 51 of the main pliers 10, and the telescopic end of the shift cylinder 52 can drive the shift pin 51 to move up and down. Specifically, a support 53 is fixedly provided on the main pliers 10, and the shift cylinder 52 is fixedly provided on the upper part of the support 53. A shift rod 54 is fixedly provided at the telescopic end of the lower end of the shift cylinder 52. The shift rod 54 is connected to the shift pin 51 by a pin shaft connection, and the central axis of the shift cylinder 52 does not coincide with the central axis of the shift pin 51.

[0060] Furthermore, the shift cylinder 52 and the switching cylinder 42 are controlled by explosion-proof electromagnetic reversing valves.

[0061] like Figure 7 and Fig.10As shown, an infrared scanning sensor 23 is provided on the backup clamp 12, and the infrared scanning sensor 23 is configured to scan the position of the wellhead casing collar. Fig.11 and Fig.12 As shown, the transmitting end and the receiving end of the infrared scanning sensor 23 are respectively arranged on both sides of the opening of the back-up clamp 12, and the transmitting end and the receiving end of the infrared scanning sensor 23 are constructed into a vertical strip shape, so that an infrared curtain with a certain height can be emitted, and the receiving end of the infrared scanning sensor 23 receives infrared rays. Adjusting the height of the back-up clamp 12 can change the height of the casing coupling blocking the infrared rays, thereby changing the height of the infrared rays received by the receiving end of the infrared scanning sensor 23. The electrical signal generated by the infrared scanning sensor 23 is transmitted to the motor 3 at the top of the vertical beam 7, and the height of the wellhead casing coupling relative to the back-up clamp 12 is calculated by the height of the casing coupling blocking the infrared rays, and then the electrical signal is fed back to the motor 3. The motor 3 controls the direction and number of turns of rotation according to the electrical signal, and adjusts the height of the back-up clamp 12, so that the back-up clamp 12 can accurately clamp the wellhead casing coupling.

[0062] like Fig.11 As shown, a torque sensor 25 is provided on the main pliers 10 and the backup pliers 12, the first end 251 of the torque sensor 25 is connected to the main pliers 10, and the second end 252 of the torque sensor 25 is connected to the backup pliers 12. The torque sensor 25 can measure the torque of the main pliers 10 relative to the backup pliers 12, thereby measuring the make-up torque, and further detecting whether the make-up is normal.

[0063] like Fig.13 and Fig.14 As shown, the rotating part of the main pliers 10 includes a coaxially arranged large toothed disc 224 and a pliers body 225. The large toothed disc 224 is driven by a power mechanism (not shown) and drives the pliers body 225 to rotate relative to the main body 226 of the main pliers 10. A notch sensor 22 is installed on the internal large toothed disc 224 of the main pliers 10. In this embodiment, the notch sensor 22 includes a notch proximity switch 221, a sensing sheet 223 and a tooth count sensor 222. Among them, the sensing sheet 223 is fixedly arranged on the side of the pliers body 225, and the notch proximity switch 221 is fixedly arranged on the main body 226 of the main pliers 10. When the pliers body 225 and the large toothed disc 224 are rotated to the opening position, the notch proximity switch 221 is aligned with the sensing sheet 223. The tooth count sensor 222 is fixedly arranged on the main body 226 and is located at the same height as the large toothed disc 224, that is, the tooth count sensor 222 is located on the side of the large toothed disc 224. The tooth count sensor 222 measures the number of teeth on the large toothed disc, and the notch proximity switch 221 calibrates the sensing sheet 223 . The two are implemented together to ensure that the notch of the large toothed disc 224 is aligned with the opening of the main pliers 10 .

[0064] In a specific embodiment, Figure 1In the direction of the invention, an electric control box is provided on the back of the crossbeam 5 for controlling various circuits of the present invention.

[0065] In a preferred embodiment, an explosion-proof camera is fixedly installed between the main clamp 10 and the backup clamp 12 to facilitate observation of the buckling state of the casing.

[0066] In a preferred embodiment, both the main tongs 10 and the backup tongs 12 adopt double-jaw climbing clamping.

[0067] The workflow of connecting the casing to be connected and the wellhead casing using the present invention is as follows.

[0068] The power casing tongs 100 are positioned at the wellhead: the walking legs 8 move along the length direction of the guide rails 13. The walking legs 8 are equipped with proximity switches. When approaching the sensing sheet on the rails 13, the walking legs 8 stop moving, so that the combination tongs 1 move to the top of the wellhead to achieve wellhead positioning.

[0069] The power casing pliers 100 automatically connect the coupling: the motor 3 on the crossbeam 5 of the gantry 14 drives the reducer 4, the reducer 4 drives the lead screw 15 to rotate, and the lead screw 15 rotates in coordination with the crossbeam 5, so that the crossbeam 5 drives the combination pliers 1 to move up and down.

[0070] Make-up: The casing to be connected is aligned from top to bottom through the guide 9, and then introduced into the main clamp 10, and passes through the aligner 11. The crossbeam 5 drives the combination clamp 1 to move upward, and the infrared scanning sensor 23 is installed on the upper part of the backup clamp 12 to detect the height of the wellhead casing coupling, so as to automatically adjust the position of the clamp body, so that the backup clamp 12 clamps the wellhead casing coupling, and the jaws 20 in the main clamp 10 clamp the casing body to be connected for rotation and make-up.

[0071] Breaking out: When the main tongs 10 rotates to make up, the torque sensor 25 monitors the torque value in real time. When an abnormal torque value is detected, it means that a wrong buckle has occurred. At this time, the main tongs 10 stops making up and reverses to make up. The main tongs 10 and the backup tongs 12 are loosened, the buckle guide 9 and the buckle counter 11 are automatically opened, and the top drive lifts the casing to be connected. Then, the damage of the casing to be connected is observed. After the observation is completed, the making-up process is restarted.

[0072] The power casing tongs 100 are moved out: the position sensor 19 on the main tongs 10 detects whether the current situation is make-up or make-out, and can judge the make-up and make-out status. After the make-up is detected, the main tongs 10 are controlled to automatically align the notch through the data detected by the notch sensor 22, the main tongs 10 and the backup tongs 12 are automatically released, the buckle guide 9 and the buckle aligner 11 are automatically opened, and the moving mechanism 2 drives the entire combination tongs 1 to automatically move out to a safe position.

[0073] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0074] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0076] Finally, it should be noted that the above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power casing tong, characterized in that: It comprises a combination pliers (1) and a moving mechanism (2). The moving mechanism is configured to be able to drive the combination clamp (1) to move in the horizontal direction and the vertical direction, so that the combination clamp (1) is aligned with the wellhead. The combined pliers (1) comprises a locking device (9), a main pliers (10), a locking device (11) and a backup pliers (12) which are coaxially arranged in sequence from top to bottom; the locking device (9) and the main pliers (10) are fixedly connected; the locking device (11) and the backup pliers (12) are fixedly connected; the main pliers (10) is configured to be able to move axially relative to the moving mechanism (2); and the backup pliers (12) is configured to be able to move axially relative to the main pliers (10).

2. The power casing tongs according to claim 1, characterized in that: The forward latch and the reverse latch of the main pliers (10) are hinged to a connecting rod (41), the middle position of the connecting rod (41) is arranged as a revolving pair, a switching cylinder (42) is arranged above the forward latch and / or the reverse latch of the main pliers (10), and the telescopic end of the switching cylinder (42) can drive the forward latch and the reverse latch to move up and down.

3. The power casing tongs according to claim 1, characterized in that: A shift oil cylinder (52) is arranged above the shift latch (51) of the master caliper (10), and the telescopic end of the shift oil cylinder (52) can drive the shift latch (51) to move up and down.

4. The power casing tongs according to claim 1, characterized in that: The moving mechanism (2) comprises a guide rail (13) arranged in a horizontal direction and a gantry (14) slidably arranged on the guide rail (13); a proximity switch is arranged on the gantry (14); and the proximity switch is configured such that when the gantry (14) moves to the point where the combination tongs (1) are aligned with a wellhead, the gantry (14) stops moving.

5. The power casing tongs according to claim 4, characterized in that: The gantry (14) comprises a walking leg (8) movably connected to a guide rail (13), a vertical beam (7) fixedly arranged on the walking leg (8), and a horizontal beam (5) movably arranged on the vertical beam (7) in a vertical direction, and the combination clamp (1) is connected to the horizontal beam (5).

6. The power casing tongs according to any one of claims 1 to 5, characterized in that: An infrared scanning sensor (23) is arranged on the backup tong (12), and the infrared scanning sensor (23) is configured to scan the positions of the backup tong (12) and the wellhead casing coupling, so that the backup tong (12) clamps the wellhead casing coupling. A torque sensor (25) is arranged on the main tong (10), and the torque sensor (25) is configured to measure the make-up torque, so as to detect whether the make-up is normal. A notch sensor (22) is installed on the jaws (20) of the main tong (10), and the notch sensor (22) is configured to measure whether the notch of the jaws (20) is aligned with the opening of the main tong (10).

7. The power casing tongs according to any one of claims 1 to 5, characterized in that: The main pliers (10) is connected to the moving mechanism (2) via a spring barrel (6); the upper end of the spring barrel (6) is hinged to the moving mechanism (2); and the lower end of the spring barrel (6) is fixedly connected to the main pliers (10).

8. The power casing tongs according to claim 7, characterized in that: A guide rod (71) is provided at the lower end of the main tongs (10), the backup tongs (12) is movably connected to the guide rod (71), a compression spring (72) is sleeved on the guide rod (71), the upper end of the compression spring (72) is axially abutted against the backup tongs (12), and the lower end of the compression spring (72) is axially abutted against the guide rod (71).

9. The power casing tongs according to any one of claims 1 to 5, characterized in that: The buckle puller (9) and the buckle counter (11) both comprise a fixed body (61) and two clamping rods (62) symmetrically and movably arranged on the fixed body (61); a first connecting rod (63) is rotatably arranged on the fixed body (61); the rotation center of the first connecting rod (63) is located on the symmetry line of the two clamping rods (62); the two ends of the first connecting rod (63) are respectively hinged to the two clamping rods (62) through a second connecting rod (64); a telescopic cylinder (65) is hinged to one of the clamping rods (62); the other end of the telescopic cylinder (65) is connected to the hinge point of the first connecting rod (63) and the second connecting rod (64).

10. The power casing tongs according to claim 9, characterized in that: A position sensor (19) is provided on the clamping rod (62), and the position sensor (19) is configured to measure the distance between the two clamping rods (62), thereby determining whether the buckle puller (9) and the buckle engaging device (11) are closed.

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