Continuous rotary iron roughneck under-pressure operation system

Abstract

The utility model relates to the technical field of oil and gas drilling and production equipment, in particular to a continuous rotary iron roughneck under-pressure operation system. The continuously-rotating iron roughneck comprises a main tong, the main tong is rotationally connected with a back-up tong through a rotating mechanism, the back-up tong is located below the main tong, the main tong is installed on a first shell, the first shell is elastically connected with the rotating mechanism through at least four elastic assemblies, the back-up tong is installed on a second shell, and the second shell is connected with the rotating mechanism through at least four elastic assemblies. And the second shell is fixedly connected with the slewing mechanism. The elastic assembly of the iron roughneck can compensate the distance change caused by tightening or loosening of a pipe column screw thread, and the elastic assembly can adapt to the angle deviation in the horizontal plane to a certain degree and help to better align a pipe column; according to the iron roughneck, various problems caused by rigid connection of the main clamp and the slewing mechanism are ingeniously solved, the adaptability and the operation efficiency of equipment are improved, the risk of damage to a tubular column is reduced, and the safety and the reliability of workover treatment under pressure are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas drilling equipment, in particular to a continuously rotating iron roughneck and pressure-operated system. Background Art

[0002] When conducting well repair operations under pressure in oil and gas fields, the iron roughneck is a key component of the entire system. The iron roughneck is a device used for the make / break and screw-down operations of drill tool joints. Traditional make / break equipment requires personnel to operate the equipment on the platform of the work machine under pressure. The equipment needs to be pushed during make / break, which is inconvenient to operate, has low efficiency and poses certain safety hazards.

[0003] In recent years, some iron roughnecks capable of continuous rotation have gradually appeared in the market. For example, Chinese invention patent with publication number CN113550703A discloses a continuously rotating multifunctional iron roughneck, or Chinese utility model patent with publication number CN217925764U discloses a small iron roughneck that is easy to operate. In both cases, the back tongs of the iron roughnecks first clamp the lower drill pipe joint, and then the screwing device on the upper part of the tongs body of the iron roughnecks performs the screwing operation. After the screwing operation is completed, the screwing device loosens the drill pipe, and the main tongs of the iron roughnecks clamp the upper drill pipe joint. The main tongs rotate a certain angle under the action of the rotating mechanism to perform the tightening operation.

[0004] However, the main tongs and the slewing mechanism of the existing continuously rotating iron roughnecks are mostly rigidly connected. During the process of upper and lower threading, the distance between the upper and lower pipe strings will change as the pipe string threads are tightened or loosened. The rigid connection between the main tongs and the slewing mechanism lacks an adjustment and compensation device, which can easily cause damage to the pipe string. Moreover, if there is an angle deviation when the upper and lower pipe strings are aligned after the main tongs clamp the upper pipe string, it is also easy to cause damage to the pipe string joint. Utility Model Content

[0005] The utility model aims to overcome the disadvantage that there is no adjustment and compensation device between the main tongs and the rotary mechanism of the existing roughneck, which easily causes damage to the pipe column joint, and provide a continuously rotary roughneck and pressure operation system.

[0006] In a first aspect, the utility model provides a continuously rotating iron roughneck, comprising a main tong, wherein the main tong is rotatably connected to a backup tong via a rotating mechanism, the backup tong is located below the main tong, the main tong is mounted on a first shell, the first shell is elastically connected to the rotating mechanism via at least four elastic components, the backup tong is mounted on a second shell, and the second shell is fixedly connected to the rotating mechanism.

[0007] The utility model provides a continuously rotating iron roughneck, in which the main tongs are mounted on a first housing and elastically connected to a rotating mechanism through at least four elastic components, the elastic components serving as a stroke compensation device, and in the process of the main tongs being screwed up and down, the elastic components compensate for the distance change caused by the tightening or loosening of the pipe string thread; the elastic components also provide a necessary buffering effect, so that the iron roughneck can flexibly adapt to the change in the distance between the upper and lower pipe strings; and the design of using at least four elastic components not only provides the adjustment capability in the vertical direction, but also can adapt to the angle deviation in the horizontal plane to a certain extent, when the main tongs clamp the upper pipe string, if there is an angle deviation with the lower pipe string, these elastic components can provide a slight angle adjustment to help better align the pipe string; the iron roughneck cleverly solves various problems caused by the rigid connection between the main tongs and the rotating mechanism, not only improves the adaptability and operating efficiency of the equipment, but also greatly reduces the risk of pipe string damage, and improves the safety and reliability of well repair operations under pressure.

[0008] Preferably, a mounting ear is provided at a position corresponding to the first shell and the elastic component, and the elastic component includes a sliding rod and a coil spring sleeved on the sliding rod, the sliding rod is passed through the mounting ear, one end of the coil spring abuts against the mounting ear, and the other end of the coil spring abuts against the rotating mechanism.

[0009] With this structural setting, the sliding rod is inserted into the mounting ear, and the mounting ear provides a precise linear guide, ensuring that the main clamp moves along a predetermined vertical path during the distance adjustment process, avoiding lateral displacement and improving movement accuracy; using a spiral spring as an elastic element, its elastic coefficient can be selected according to different specifications of pipe columns and working conditions. By replacing springs with different stiffnesses, the size of the compensation force can be flexibly adjusted to adapt to various operating conditions; at least four elastic components are used, which can be evenly distributed around the first shell, and each elastic component works independently, ensuring that the main clamp is evenly stressed, moves smoothly, and improves working stability; this structural design is simple and clear, easy to process and manufacture, and also convenient for purchasing standard parts, reducing production costs.

[0010] Preferably, a connecting rod is further included, and the sliding rods located on the same side of the first shell are connected to the same connecting rod.

[0011] With this structural arrangement, the sliding rods on the same side of the first shell are connected to the same connecting rod, so that the two elastic components on the same side form a linkage mechanism, which maintains synchronous and equal movement during compression, so that the main pliers maintain a good balance during the adjustment process and avoids tilting or twisting; the introduction of the connecting rod can also form a rigid frame-like structure on both sides of the first shell, for example, thereby enhancing the overall rigidity of the main pliers, maintaining stability even under the action of lateral forces, and helping to prevent unexpected lateral displacement of the main pliers during operation.

[0012] Preferably, the first shell is provided with a through hole for the pipe column to pass through, and a centralizer is installed on a side of the through hole away from the slewing mechanism.

[0013] With this structural setting, the centralizer is installed on the side of the through hole away from the slewing mechanism. When the pipe string is inserted into the iron roughneck, it first passes through the centralizer, which guides the pipe string into the correct axis to achieve pre-alignment and reduce the difficulty of subsequent clamping. Since the pipe string has been pre-aligned by the centralizer, the main clamp can clamp the pipe string faster and more accurately. This improves the clamping efficiency and speeds up the entire make-up and break-out process.

[0014] Preferably, the slewing mechanism is a hydraulic slewing mechanism, and the slewing mechanism is equipped with at least two hydraulic motors.

[0015] The preferred slewing mechanism is a hydraulic slewing mechanism, which can provide more powerful torque, allowing the iron roughneck to easily handle high-strength, large-size pipe string connections.

[0016] Preferably, an overflow cavity is provided in the second shell, and the back-up clamp is installed on both sides of the second shell.

[0017] The oil and gas field environment often contains pollutants such as mud, rock cuttings, and oil. The design of the overflow cavity provides a discharge channel for these pollutants. When taking the oil pipe, it can prevent the sewage in the oil pipe from spraying onto the table, keep the iron drill clean, and is beneficial to the environmental protection of the oil field.

[0018] Preferably, a drain pipe is provided on one side of the second shell, and the drain pipe is connected to the overflow cavity.

[0019] With this structural arrangement, the drain pipe is directly connected to the overflow cavity, which improves the sewage discharge efficiency. Pollutants such as sewage, mud, and rock chips in the overflow cavity sewage bucket can be discharged quickly without accumulating in the cavity.

[0020] Preferably, a door panel is installed on one side of the second shell, and the door panel is hinged to the second shell.

[0021] With this structural setting, the door panel can be easily opened, providing direct access to the interior of the second shell. The staff can directly clean the accumulated mud, rock cuttings and other pollutants to keep the interior clean and extend the service life of the equipment. When the backup clamp or internal pipeline needs to be repaired, the technician can directly open the door panel on site to quickly replace the components and reduce downtime.

[0022] Preferably, a push rod is installed on the second shell, and the push rod is used to drive the door panel to open or close.

[0023] In the second aspect, the utility model provides a pressure-operating system, comprising a power catwalk, a pipe lifting device, a tabletop manipulator, and a pressure-operating machine; the power catwalk is arranged on one side of the pressure-operating machine; the pipe lifting device is connected to the pressure-operating machine, and the pipe lifting device is used to pick up and deliver pipe strings between the power catwalk and the pressure-operating machine; the tabletop manipulator is installed on the pressure-operating machine, and the tabletop manipulator is used to switch the pipe string between a vertical state and an inclined state; the pressure-operating machine is used to disassemble or install the pipe string in the wellbore under the pressure state; and it also includes the above-mentioned continuously rotating iron driller, and the continuously rotating iron driller is installed on the pressure-operating machine.

[0024] The utility model provides a pressure operation system, in which the continuously rotating iron roughneck can flexibly adapt to the change of the distance between the upper and lower pipe strings, and the elastic component can provide a small angle adjustment to help better align the pipe string, which ingeniously solves various problems caused by the rigid connection between the main clamp and the rotating mechanism, not only improves the adaptability and operating efficiency of the equipment, but also greatly reduces the risk of pipe string damage, and improves the safety and reliability of pressure well repair operations.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] 1. The continuously rotating iron roughneck provided by the utility model has a main tong installed on a first housing and elastically connected to a rotating mechanism through at least four elastic components. The elastic components act as a stroke compensation device. During the process of the main tong being screwed up and down, the elastic components compensate for the distance change caused by the tightening or loosening of the pipe string thread. The elastic components also provide a necessary buffering effect, so that the iron roughneck can flexibly adapt to the change in the distance between the upper and lower pipe strings.

[0027] 2. The continuously rotating iron roughneck provided by the utility model uses a design of at least four elastic components, which not only provides the ability to adjust in the vertical direction, but also can adapt to the angle deviation in the horizontal plane to a certain extent. When the main tongs clamp the upper pipe string, if there is an angle deviation with the lower pipe string, these elastic components can provide a slight angle adjustment to help better align the pipe string;

[0028] 3. The continuously rotating iron roughneck provided by the utility model ingeniously solves various problems caused by the rigid connection between the main tongs and the rotating mechanism, which not only improves the adaptability and operating efficiency of the equipment, but also greatly reduces the risk of pipe column damage and improves the safety and reliability of well repair operations under pressure.

[0029] 4. The pressure-operating system provided by the utility model has a continuously rotating iron roughneck that can flexibly adapt to changes in the distance between the upper and lower pipe strings, and the elastic component can provide slight angle adjustments to help better align the pipe string, which ingeniously solves various problems caused by the rigid connection between the main clamp and the rotating mechanism, not only improving the adaptability and operating efficiency of the equipment, but also greatly reducing the risk of pipe string damage, and improving the safety and reliability of pressure-operated well repair operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of a continuously rotating iron roughneck.

[0031] Figure 2 for Figure 1 Left view of .

[0032] Figure 3 for Figure 1 Right view of .

[0033] Figure 4 for Figure 3 Section view along AA direction.

[0034] Figure 5 It is a schematic diagram of the elastic component structure.

[0035] Figure 6 It is a schematic diagram of the first shell structure.

[0036] Figure 7 It is a schematic diagram of the second shell structure.

[0037] Figure 8 This is a schematic diagram of the structure after the door panel is installed on the second shell.

[0038] Markings in the figure:

[0039] 1-main clamp, 2-slewing mechanism, 21-hydraulic motor, 3-back clamp, 4-elastic component, 41-sliding rod, 42-coil spring, 5-connecting rod, 6-stabilizer, 7-door plate, 100-first shell, 101-mounting ear, 102-through hole, 200-second shell, 201-overflow cavity, 202-drain pipe, 203-push rod. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0041] In the description of the specific embodiments of the present invention, unless otherwise specified, the terms indicating the orientation or position relationship such as "upper", "lower", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product / equipment / device of the utility model is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the utility model or simplifying the description in the specific embodiments, so that technicians can quickly understand the scheme, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0042] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the solution of the utility model.

[0043] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0044] In addition, in the description of the embodiments of the present invention, "several", "multiple" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0045] In addition, in the description of the technical solution of the utility model, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication of two components.

[0046] Example 1

[0047] like Figure 1-Figure 4 As shown, a continuously rotating iron roughneck comprises a main tong 1, which is rotatably connected to a backup tong 3 via a rotating mechanism 2, and the backup tong 3 is located below the main tong 1;

[0048] The main pliers 1 are mounted on the first housing 100, and the first housing 100 is elastically connected to the slewing mechanism 2 through at least four elastic components 4 (for example Figure 1 It shows a situation where four elastic components 4 are provided, the back clamp 3 is installed on the second shell 200 , and the second shell 200 is fixedly connected to the slewing mechanism 2 .

[0049] Specifically, Figure 6 As shown, the first shell 100 may be a rectangular parallelepiped structure with holes on six sides. Figure 1 A through hole 102 is provided in the vertical direction (up and down direction) for the pipe string to pass through, and a centralizer 6 is installed on the side of the through hole 102 away from the slewing mechanism 2. The centralizer 6 of this embodiment can use the oil pipe centralizer commonly used in industrial production. With this structural arrangement, the centralizer 6 is installed on the side of the through hole 102 away from the slewing mechanism 2. When the pipe string is inserted into the iron driller, it first passes through the centralizer 6. The centralizer 6 will guide the pipe string into the correct axis to achieve pre-alignment and reduce the difficulty of subsequent clamping; because the pipe string has been pre-aligned by the centralizer 6, the main clamp 1 can clamp the pipe string faster and more accurately. This improves the clamping efficiency and speeds up the entire make-up and breakout process.

[0050] like Figure 1 , Figure 4 As shown, there are two main pliers 1, which are respectively installed on the left and right sides of the first housing 100. The two main pliers 1 are arranged opposite to each other. The main pliers 1 include a propulsion cylinder and a jaw, and the jaw is installed at the output end of the propulsion cylinder. When the pipe string is between the two main pliers 1, the output end of the propulsion cylinder pushes the jaw through the through holes passing through the left and right sides of the first housing 100. The jaw is in an arc shape as a whole. As the jaw approaches the pipe string, it clamps the pipe string, thereby maintaining the stability of the pipe string.

[0051] The slewing mechanism 2 of this embodiment is a hydraulic slewing mechanism (also called a hydraulic slewing transmission device), which may include, for example, a hydraulic motor, a brake, a reducer, a valve group, and a gear end structure. The hydraulic slewing mechanism transmits torque to the gear box through the hydraulic motor to increase torque and reduce speed, thereby achieving the requirement of low speed and high torque. The slewing mechanism 2 is installed with at least two hydraulic motors 21. Preferably, the slewing mechanism 2 is a hydraulic slewing mechanism, which can provide more powerful torque, so that the iron roughneck can easily handle high-strength and large-size pipe string connections.

[0052] In this embodiment, a mounting ear 101 is provided at a position corresponding to the first housing 100 and the elastic component 4, for example Figure 6 As shown, four mounting ears 101 are installed around the first rectangular parallelepiped housing 100. Figure 1 , Figure 5 As shown, the continuous rotating iron roughneck provided in this embodiment further includes a connecting rod 5, and the elastic component 4 specifically includes a sliding rod 41 and a coil spring 42 sleeved on the sliding rod 41; the sliding rod 41 located on the same side of the first housing 100 is connected to the same connecting rod 5, that is, for example Figure 2 As shown, Figure 2 The two elastic components 4 on the left side of the first housing 100 are connected to the same connecting rod 5; Figure 2 The two elastic components 4 on the right side of the first housing 100 are connected to the same connecting rod 5; the sliding rod 41 is inserted through the mounting ear 101. Figure 1 As shown, after the slide rod 41 passes through the mounting ear 101, the upper end of the slide rod 41 is fixedly connected to the connecting rod 5, and the lower end of the slide rod 41 is fixedly connected to the upper surface of the rotating mechanism 2; one end of the coil spring 42 abuts against the lower surface of the mounting ear 101, and the other end of the coil spring 42 abuts against the upper surface of the rotating mechanism 2.

[0053] With this structural setting, the slide bar 41 is inserted into the mounting ear 101, and the mounting ear 101 provides a precise linear guide, ensuring that the main clamp 1 moves along a predetermined vertical path during the distance adjustment process, avoiding lateral displacement and improving the movement accuracy; using a coil spring 42 as an elastic element, its elastic coefficient can be selected according to different specifications of the pipe column and working conditions. By replacing springs with different stiffnesses, the size of the compensation force can be flexibly adjusted to adapt to various operating conditions; at least four elastic components 4 are used, which can be evenly distributed around the first shell 100, and each elastic component 4 works independently, ensuring that the main clamp 1 is evenly stressed and moves smoothly, thereby improving the working stability; this structural design is simple and clear, easy to process and manufacture, and also convenient for purchasing standard parts, reducing production costs. The sliding rod 41 located on the same side of the first housing 100 is connected to the same connecting rod 5, so that the two elastic components 4 on the same side form a linkage mechanism, which maintains synchronous and approximately equal movement during compression, so that the main clamp 1 maintains a good balance during the adjustment process and avoids tilting or twisting; the introduction of the connecting rod 5 can also form a rigid frame-like structure on both sides of the first housing 100, for example, to enhance the overall rigidity of the main clamp 1, and maintain stability even under the action of lateral force, which helps to prevent unexpected lateral displacement of the main clamp 1 during operation.

[0054] The continuously rotating iron roughneck provided in this embodiment has a main tong 1 mounted on a first housing 100 and elastically connected to a rotating mechanism 2 through at least four elastic components 4. The elastic components 4 act as a stroke compensation device. During the process of the main tong 1 being screwed up and down, the elastic components 4 compensate for the distance change caused by the tightening or loosening of the pipe string thread. The elastic components 4 also provide a necessary buffering effect, so that the iron roughneck can flexibly adapt to the change in the distance between the upper and lower pipe strings. Moreover, the design of using at least four elastic components 4 not only provides the adjustment capability in the vertical direction, but also can adapt to the angle deviation in the horizontal plane to a certain extent. When the main tong 1 clamps the upper pipe string, if there is an angle deviation with the lower pipe string, these elastic components 4 can provide a slight angle adjustment to help better align the pipe string. The iron roughneck cleverly solves various problems caused by the rigid connection between the main tong 1 and the rotating mechanism 2, which not only improves the adaptability and operating efficiency of the equipment, but also greatly reduces the risk of pipe string damage, and improves the safety and reliability of well repair operations under pressure.

[0055] Example 2

[0056] Since there are often pollutants such as mud, rock cuttings, and oil in the oil and gas field environment, Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8 As shown, on the basis of Example 1, an overflow cavity 201 is provided in the second housing 200 of the continuously rotating iron roughneck provided in this embodiment, and the backup tongs 3 are installed on both sides of the second housing 200. The design of the overflow cavity 201 provides a discharge channel for these pollutants, for example, when taking out the oil pipe, it can prevent the sewage in the oil pipe from spraying onto the table, keep the iron roughneck clean, and be beneficial to oil field environmental protection.

[0057] like Figure 4 As shown, similar to the main tongs 1, the number of the backup tongs 3 is also two, and the two backup tongs 3 are respectively installed on the left and right sides of the second housing 200, and the two backup tongs 3 are arranged opposite to each other. The backup tongs 3 also include a propulsion cylinder and a jaw, and the jaw is installed at the output end of the propulsion cylinder. When the pipe string is between the two backup tongs 3, the output end of the propulsion cylinder pushes the jaw through the through holes passing through the left and right sides of the second housing 200. The shape of the jaw is an arc as a whole. As the jaw approaches the pipe string, it clamps the pipe string, thereby maintaining the stability of the pipe string.

[0058] Furthermore, a drain pipe 202 is provided on one side of the second housing 200, and the drain pipe 202 is connected to the overflow cavity 201. The drain pipe 202 is directly connected to the overflow cavity 201, which improves the sewage discharge efficiency. The sewage, mud, rock debris and other pollutants in the sewage bucket of the overflow cavity 201 can be discharged quickly without accumulating in the cavity.

[0059] Further, a door panel 7 is installed on one side of the second housing 200, and the door panel 7 is hinged to the second housing 200. The second housing 200 is installed with a push rod 203, and the push rod 203 is used to drive the door panel 7 to open or close. Specifically, the push rod 203 can be a hydraulic cylinder, an oil cylinder or a gas cylinder.

[0060] With this structural setting, the door panel 7 can be easily opened, providing a direct access to the interior of the second housing 200. The staff can directly clean the accumulated mud, rock cuttings and other pollutants to keep the interior clean and extend the service life of the equipment. When the back-up clamp 3 or the internal pipeline needs to be repaired, the technician can directly open the door panel 7 on site to quickly replace the components and reduce downtime.

[0061] Example 3

[0062] The present embodiment provides a pressure-operating system, including a power catwalk, a pipe lifting device, a tabletop manipulator, and a pressure-operating machine. The power catwalk is arranged on one side of the pressure-operating machine, and the power catwalk is used to switch the pipe string between a flat state and an inclined state, and to pick up and send the pipe string between a pipe lifting mechanism and a pipe bearing mechanism; the pipe lifting device is connected to the pressure-operating machine, and the pipe lifting device is used to pick up and send the pipe string between the power catwalk and the pressure-operating machine; the tabletop manipulator is installed on the pressure-operating machine, and the tabletop manipulator is used to straighten the pipe string, so that the pipe string can be switched between a vertical state and an inclined state; the pressure-operating machine The machine is used to remove or install a tubular column in a wellbore under pressure; it also includes the continuously rotating iron roughneck provided in Example 2, which is installed on the pressure-operated machine. The continuously rotating iron roughneck can flexibly adapt to changes in the distance between the upper and lower tubular columns, and the elastic component 4 can provide a slight angle adjustment to help better align the tubular column, which ingeniously solves various problems caused by the rigid connection between the main clamp 1 and the rotating mechanism 2, not only improving the adaptability and operating efficiency of the equipment, but also greatly reducing the risk of tubular column damage, and improving the safety and reliability of pressure well repair operations.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A continuously rotating iron roughneck, comprising a main tong (1), wherein the main tong (1) is rotatably connected to a backup tong (3) via a rotating mechanism (2), wherein the backup tong (3) is located below the main tong (1), and characterized in that: The main tongs (1) are mounted on a first housing (100), the first housing (100) is elastically connected to the slewing mechanism (2) via at least four elastic components (4), the backup tongs (3) are mounted on a second housing (200), and the second housing (200) is fixedly connected to the slewing mechanism (2).

2. A continuously rotating iron roughneck according to claim 1, characterized in that: A mounting ear (101) is provided at a position corresponding to the first shell (100) and the elastic component (4); the elastic component (4) comprises a slide bar (41) and a coil spring (42) sleeved on the slide bar (41); the slide bar (41) is passed through the mounting ear (101); one end of the coil spring (42) abuts against the mounting ear (101); and the other end of the coil spring (42) abuts against the rotating mechanism (2).

3. A continuously rotating iron roughneck according to claim 2, characterized in that: It also comprises a connecting rod (5), and the sliding rods (41) located on the same side of the first shell (100) are connected to the same connecting rod (5).

4. A continuously rotating iron roughneck according to claim 1, characterized in that: The first shell (100) is provided with a through hole (102) for a pipe column to pass through, and a centralizer (6) is installed on a side of the through hole (102) away from the slewing mechanism (2).

5. A continuously rotating iron roughneck according to claim 1, characterized in that: The slewing mechanism (2) is a hydraulic slewing mechanism, and the slewing mechanism (2) is equipped with at least two hydraulic motors (21).

6. A continuously rotating iron roughneck according to claim 1, characterized in that: An overflow cavity (201) is provided in the second shell (200), and the back-up clamp (3) is installed on both sides of the second shell (200).

7. A continuously rotating iron roughneck according to claim 6, characterized in that: A liquid discharge pipe (202) is provided on one side of the second shell (200), and the liquid discharge pipe (202) is connected to the overflow cavity (201).

8. A continuously rotating iron roughneck according to claim 6, characterized in that: A door panel (7) is installed on one side of the second shell (200), and the door panel (7) is hinged to the second shell (200).

9. A continuously rotating iron roughneck according to claim 8, characterized in that: The second housing (200) is provided with a push rod (203), and the push rod (203) is used to drive the door panel (7) to open or close.

10. A pressure operation system, comprising a power catwalk, a pipe lifting device, a tabletop manipulator, and a pressure operation machine; the power catwalk is arranged on one side of the pressure operation machine; the pipe lifting device is connected to the pressure operation machine, and the pipe lifting device is used to pick up and send pipe strings between the power catwalk and the pressure operation machine; the tabletop manipulator is installed on the pressure operation machine, and the tabletop manipulator is used to switch the pipe string between a vertical state and an inclined state; the pressure operation machine is used to remove or install the pipe string in the wellbore under pressure; it is characterized in that It also comprises the continuously rotating iron roughneck as described in any one of claims 1 to 9, wherein the continuously rotating iron roughneck is installed on the belt pressure working machine.

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