Casing power tongs with back-up tongs

Abstract

The invention discloses a sleeve power tong with a back-up tong, which comprises a back-up tong assembly, a main tong assembly and a hydraulic system, and is characterized in that the back-up tong assembly and the main tong assembly are connected through a connecting mechanism; the connecting mechanism comprises a rear guide rod connecting assembly and two front guide rod connecting assemblies; the two front guide rod connecting assemblies are arranged on the two sides of the front end of the back-up wrench assembly respectively. By arranging the rear adjusting assembly and the front adjusting assembly, the distance between the back-up wrench and the main wrench can be flexibly adjusted on the basis of notification of floating connection between the back-up wrench and the main wrench; a tension spring is arranged between the adapter bracket and the back-up tong bracket, and when the main tong vibrates up and down during working, the tension spring provides upward tension and downward support force, so that the overall stability is improved; and the distance adjusting hydraulic cylinder and the swing hydraulic cylinder are connected with an existing hydraulic system, the structure is compact, the automation degree is high, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic pliers, and in particular to a casing power pliers with a backup pliers. Background Art

[0002] Casing power tongs are special tools for loading and unloading drill pipes, sucker rods, and tubings in oil system drilling and downhole operations. The backup tongs can be used in conjunction with the main tongs to clamp casing couplings. The backup tongs and the main tongs adopt a floating structure to maintain a certain degree of freedom; the main tongs are connected with pins, and the combination of the two tongs is convenient and fast. However, the current connection structure of the backup tongs and the main tongs makes the spacing adjustment cumbersome and inconvenient to operate. Summary of the invention

[0003] The object of the present invention is to provide a casing power tong with a backup tong in view of the deficiencies in the prior art.

[0004] The technical solution of the present invention to solve the above problem is: a casing power tong with a backup tong, comprising a backup tong assembly, a main tong assembly, and a hydraulic system, wherein the backup tong assembly and the main tong assembly are connected via a connecting mechanism;

[0005] The connecting mechanism comprises a rear guide rod connecting assembly and two front guide rod connecting assemblies; the two front guide rod connecting assemblies are respectively arranged on both sides of the front end of the back clamp assembly;

[0006] The rear guide rod connection assembly includes a rear guide rod, a main tong bracket, a back tong bracket, and an adapter bracket. The main tong bracket is fixedly connected to the rear of the main tong assembly, the back tong bracket is fixedly connected to the rear of the back tong assembly, the main tong bracket is connected to the adapter bracket through a rear adjustment assembly, the barrel of the rear guide rod is fixedly connected to the back tong bracket, and the adapter bracket is fixedly connected to the upper end of the floating rod body of the rear guide rod;

[0007] The front guide rod connecting assembly includes a guide rod body, a guide rod spring, a back tongs connecting piece, a front adjustment assembly and a main tongs connecting piece. A guide rod base is provided at the bottom of the guide rod body. The back tongs connecting piece is fixedly connected to the back tongs assembly. A guide hole is provided on the back tongs connecting piece for the guide rod body to pass through. The upper end of the guide rod body passes through the guide hole to connect the front adjustment assembly. The upper end of the front adjustment assembly is fixedly connected to the main tongs connecting piece. The main tongs connecting piece is fixedly connected to the main tongs assembly. The guide rod spring is sleeved on the guide rod body and is located between the guide rod base and the back tongs connecting piece.

[0008] Furthermore, a tension spring is provided between the adapter bracket and the back-up clamp bracket, the upper end of the tension spring is fixedly connected to the adapter bracket, and the lower end is fixedly connected to the back-up clamp bracket; the two ends of the tension spring are respectively threaded sections, the threaded section at the upper end passes through the adapter bracket, and is threadedly connected to the fastening bolts at the upper and lower ends; the threaded section at the lower end passes through the back-up clamp bracket, and is threadedly connected to the fastening bolts at the upper and lower ends.

[0009] Furthermore, the upper end of the front adjustment assembly is connected to the first flange, the main clamp connecting piece includes a connecting rod, and a connecting hole is provided on the main clamp assembly. The connecting rod passes through the connecting hole and is fixed at both ends by locking bolts. The lower end of the connecting rod is connected to the second flange, and the first flange and the second flange are connected by multiple bolts and nuts.

[0010] Furthermore, the rear adjustment assembly includes at least two spacing adjustment cylinders.

[0011] Furthermore, the front adjustment component is a spacing adjustment cylinder or an adjustable telescopic rod.

[0012] Furthermore, the back-up tong assembly includes a back-up tong body, a back-up tong jaw frame, a swing jaw assembly and a swing hydraulic cylinder;

[0013] The main clamp assembly includes a hydraulic motor;

[0014] The swing cylinder, hydraulic motor and spacing adjustment cylinder are driven by a hydraulic system, which includes an oil tank, an oil pump, a hydraulic pipeline and a valve group. The hydraulic pipeline includes a main oil inlet pipe and a main oil return pipe. One end of the oil pump is connected to the oil tank and the other end is connected to the main oil inlet pipe. The main oil return pipe is connected to the oil tank.

[0015] The valve group includes a two-way reversing valve, a four-way reversing valve and a six-way reversing valve, the main oil inlet pipe is connected to the inlet of the two-way reversing valve, the first oil outlet pipe of the two-way reversing valve is connected to the three-dimensional oil inlet of the four-way reversing valve, the oil return port of the four-way reversing valve is connected to the main oil return pipeline, each spacing adjusting cylinder is connected in parallel to the first working oil port and the second working oil port of the four-way reversing valve, a flow valve is provided on the parallel pipeline of each spacing adjusting cylinder, the second oil outlet pipe of the two-way reversing valve is connected to the three-dimensional oil inlet of the six-way reversing valve, the oil return port of the six-way reversing valve is connected to the main oil return pipeline, the hydraulic motor is connected to the first working oil port and the second working oil port of the six-way reversing valve, and the swing cylinder is connected to the third working oil port and the fourth working oil port of the six-way reversing valve.

[0016] Furthermore, a flow valve is provided on the parallel pipeline of each spacing regulating cylinder.

[0017] Furthermore, an overflow valve is provided on the main oil return pipe.

[0018] The present invention has the beneficial effects:

[0019] The present invention provides a casing power tong with a backup tong. By arranging a rear adjustment component and a front adjustment component, the distance between the backup tong and the main tong can be flexibly adjusted while realizing a floating connection between the backup tong and the main tong. A tension spring is arranged between the adapter bracket and the backup tong bracket. When the main tong vibrates up and down during operation, the tension force is provided upward and the supporting force is provided downward, thereby improving the overall stability. The distance adjustment hydraulic cylinder and the swing hydraulic cylinder are connected with the existing hydraulic system, with a compact structure, a high degree of automation, and improved work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the casing power tong when it is suspended;

[0021] Figure 2 It is a structural schematic diagram of casing power tongs;

[0022] Figure 3 It is a structural diagram of the hydraulic system;

[0023] In the figure: 1-back-up clamp assembly, 2-main clamp assembly, 3-back-up clamp body, 4-swing hydraulic cylinder, 5-main clamp body, 6-hydraulic motor, 7-rear guide rod connecting assembly, 8-front guide rod connecting assembly;

[0024] 701-rear guide rod, 702-main clamp bracket, 703-back clamp bracket, 704-adapter bracket, 705-distance adjustment cylinder, 706-tension spring;

[0025] 801-guide rod body, 802-guide rod spring, 803-back clamp connector, 804-front adjustment assembly, 805-main clamp connector, 806-guide rod base;

[0026] 901-main oil inlet pipe, 902-main oil return pipe, 903-oil tank, 904-oil pump, 905-two-way reversing valve, 906-four-way reversing valve, 907-six-way reversing valve, 908-flow valve, 909-overflow valve;

[0027] 1001 - first suspension rod, 1002 - second suspension rod, 1003 - first leveling mechanism, 1004 - second leveling mechanism. DETAILED DESCRIPTION

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected 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 by specific circumstances.

[0029] As shown in the figure, a casing power tong with a backup tong comprises a backup tong assembly, a main tong assembly, and a hydraulic system. The backup tong assembly and the main tong assembly are connected via a connecting mechanism.

[0030] The back-up tong assembly comprises a back-up tong body, a back-up tong jaw frame, a swinging jaw assembly and a swinging hydraulic cylinder. The back-up tong jaw frame is rotatably connected to the back-up tong body. The swinging jaw assembly comprises two swinging jaw bodies. The swinging jaw bodies are arranged in swinging shaft holes on the back-up tong jaw frame through swinging shafts. One end of the swinging hydraulic cylinder is rotatably connected to the back-up tong body, and the other end is rotatably connected to the back-up tong jaw frame.

[0031] The main pliers assembly comprises a main pliers body, a main pliers jaw frame and a main pliers jaw assembly. The main pliers jaw frame is rotatably connected to the main pliers body. The main pliers jaw assembly is connected to the main pliers jaw frame. The main pliers jaw frame is driven by a hydraulic motor through a transmission mechanism.

[0032] The connecting mechanism includes a rear guide rod connecting assembly and two front guide rod connecting assemblies, the rear guide rod connecting assembly includes a rear guide rod, a main tong bracket, a back tong bracket, and an adapter bracket, the main tong bracket is fixedly connected to the rear of the main tong body, the back tong bracket is fixedly connected to the rear of the back tong body, the main tong bracket is connected to the adapter bracket through a rear adjustment assembly, the barrel of the rear guide rod is fixedly connected to the back tong bracket, the adapter bracket is fixedly connected to the upper end of the floating rod body of the rear guide rod, the rear adjustment assembly includes at least two spacing adjustment cylinders, a tension spring is provided between the adapter bracket and the back tong bracket, the upper end of the tension spring is fixedly connected to the adapter bracket, and the lower end is fixedly connected to the back tong bracket. The two ends of the tension spring are respectively threaded sections, the threaded section at the upper end passes through the adapter bracket, and is threadedly connected to the fastening bolts at the upper and lower ends; the threaded section at the lower end passes through the back tong bracket, and is threadedly connected to the fastening bolts at the upper and lower ends. Two front guide rod connection assemblies are respectively arranged on both sides of the front end of the back tong body, the front guide rod connection assembly includes a guide rod body, a guide rod spring, a back tong connection piece, a front adjustment assembly and a main tong connection piece, the guide rod body is provided with a guide rod base at the bottom, the back tong connection piece is fixedly connected to the back tong body, the back tong connection piece is provided with a guide hole for the guide rod body to pass through, the upper end of the guide rod body passes through the guide hole to connect the front adjustment assembly, the upper end of the front adjustment assembly is fixedly connected to the main tong connection piece, the main tong connection piece is fixedly connected to the main tong body, the guide rod spring is sleeved on the guide rod body and is located between the guide rod base and the back tong connection piece. The upper end of the front adjustment assembly is connected to the first flange, the main tong connection piece includes a connecting rod, the main tong body is provided with a connecting hole, the connecting rod passes through the connecting hole and is fixed at both ends by locking bolts, the lower end of the connecting rod is connected to the second flange, and the first flange and the second flange are connected by a plurality of bolts and nuts.

[0033] In one embodiment, the front adjustment component is a spacing adjustment cylinder.

[0034] In another embodiment, the front adjustment component is an adjustable telescopic rod, which includes an outer rod body, an inner rod body and a locking bolt. The inner rod body is slidably connected to the outer rod body, and two locking bolts are symmetrically provided on the side wall of the outer rod body. The locking bolts are threadedly connected to the side wall of the outer rod body. The inner rod body can be locked when tightened, and can be movably adjusted when loosened.

[0035] The swing cylinder, hydraulic motor and spacing adjustment cylinder are driven by a hydraulic system, which includes an oil tank, an oil pump, a hydraulic pipeline and a valve group. The hydraulic pipeline includes a main oil inlet pipe and a main oil return pipe. One end of the oil pump is connected to the oil tank, and the other end is connected to the main oil inlet pipe. The main oil return pipe is connected to the oil tank. The valve group includes a two-way reversing valve, a four-way reversing valve and a six-way reversing valve. The main oil inlet pipe is connected to the inlet of the two-way reversing valve, the first oil outlet pipe of the two-way reversing valve is connected to the three-dimensional oil inlet of the four-way reversing valve, and the oil return port of the four-way reversing valve is connected to the main oil return pipeline. Each spacing adjustment cylinder is connected in parallel to the first working oil port and the second working oil port of the four-way reversing valve. A flow valve is provided on the parallel pipeline of each spacing adjustment cylinder. The four-way reversing valve can control the reversal of the first working oil port and the second working oil port. The second oil outlet pipe of the two-way reversing valve is connected to the three-dimensional oil inlet of the six-way reversing valve, the oil return port of the six-way reversing valve is connected to the main oil return pipeline, the hydraulic motor is connected to the first working oil port and the second working oil port of the six-way reversing valve, and the swing cylinder is connected to the third working oil port and the fourth working oil port of the six-way reversing valve. The six-way reversing valve can be controlled to switch between the first working oil port and the second working oil port, the third working oil port and the fourth working oil port, and can control the reversing of the first working oil port and the second working oil port and the reversing of the third working oil port and the fourth working oil port.

[0036] In one embodiment, a relief valve is provided on the main oil return pipe.

[0037] In one embodiment, the casing power tong is suspended by a suspension mechanism, the suspension mechanism includes a first suspension rod and a second suspension rod, the upper end of the first suspension rod is connected to a wire rope, the first suspension rod and the second suspension rod are connected by a first leveling mechanism, and the lower end of the second suspension rod is connected to the main tong assembly by a second leveling mechanism. The casing power tong is suspended by a wire rope, the wire rope passes through a pulley, and the pulley is slidably connected to the bracket. After the casing power tong is suspended, it is first leveled front and back by the first leveling mechanism, and leveled left and right by the second leveling mechanism, and then the sliding adjustment pulley is moved horizontally to the top of the wellhead.

[0038] After the casing power tongs are moved to the wellhead, the distance between the main tong assembly and the backup tong assembly is adjusted through the hydraulic system, and the two pipes at the wellhead are respectively inserted into the jaw cavities of the backup tong assembly and the main tong assembly. The swing cylinder is first controlled to clamp the lower pipe through the backup tong assembly, and then the main tong jaw assembly clamps the upper pipe. Finally, the hydraulic motor is started to make or break the work.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A casing power tong with a backup tong, characterized in that: It comprises a backup tong assembly, a main tong assembly and a hydraulic system, wherein the backup tong assembly and the main tong assembly are connected via a connecting mechanism; The connecting mechanism comprises a rear guide rod connecting assembly and two front guide rod connecting assemblies; the two front guide rod connecting assemblies are respectively arranged on both sides of the front end of the back clamp assembly; The rear guide rod connection assembly includes a rear guide rod, a main tong bracket, a back tong bracket, and an adapter bracket. The main tong bracket is fixedly connected to the rear of the main tong assembly, the back tong bracket is fixedly connected to the rear of the back tong assembly, the main tong bracket is connected to the adapter bracket through a rear adjustment assembly, the barrel of the rear guide rod is fixedly connected to the back tong bracket, and the adapter bracket is fixedly connected to the upper end of the floating rod body of the rear guide rod; The front guide rod connecting assembly includes a guide rod body, a guide rod spring, a back tongs connecting piece, a front adjustment assembly and a main tongs connecting piece. A guide rod base is provided at the bottom of the guide rod body. The back tongs connecting piece is fixedly connected to the back tongs assembly. A guide hole is provided on the back tongs connecting piece for the guide rod body to pass through. The upper end of the guide rod body passes through the guide hole to connect the front adjustment assembly. The upper end of the front adjustment assembly is fixedly connected to the main tongs connecting piece. The main tongs connecting piece is fixedly connected to the main tongs assembly. The guide rod spring is sleeved on the guide rod body and is located between the guide rod base and the back tongs connecting piece.

2. A casing power tong with a backup tong as claimed in claim 1, characterized in that: A tension spring is provided between the adapter bracket and the back-up clamp bracket, the upper end of the tension spring is fixedly connected to the adapter bracket, and the lower end is fixedly connected to the back-up clamp bracket; the two ends of the tension spring are respectively threaded sections, the threaded section at the upper end passes through the adapter bracket, and is threadedly connected to the fastening bolts at the upper and lower ends; the threaded section at the lower end passes through the back-up clamp bracket, and is threadedly connected to the fastening bolts at the upper and lower ends.

3. A casing power tong with a backup tong as claimed in claim 1, characterized in that: The upper end of the front adjustment assembly is connected to the first flange, the main pliers connecting piece includes a connecting rod, a connecting hole is provided on the main pliers assembly, the connecting rod passes through the connecting hole and is fixed at both ends by locking bolts, the lower end of the connecting rod is connected to the second flange, and the first flange and the second flange are connected by multiple bolts and nuts.

4. A casing power tong with a backup tong as claimed in claim 1, characterized in that: The rear adjustment assembly includes at least two spacing adjustment cylinders.

5. A casing power tong with a backup tong as claimed in claim 4, characterized in that: The front adjustment component is a spacing adjustment cylinder or an adjustable telescopic rod.

6. A casing power tong with a backup tong as claimed in claim 4 or 5, characterized in that: The back-up tong assembly comprises a back-up tong body, a back-up tong jaw frame, a swing jaw assembly and a swing hydraulic cylinder; The main clamp assembly includes a hydraulic motor; The swing cylinder, hydraulic motor and spacing adjustment cylinder are driven by a hydraulic system, which includes an oil tank, an oil pump, a hydraulic pipeline and a valve group. The hydraulic pipeline includes a main oil inlet pipe and a main oil return pipe. One end of the oil pump is connected to the oil tank and the other end is connected to the main oil inlet pipe. The main oil return pipe is connected to the oil tank. The valve group includes a two-way reversing valve, a four-way reversing valve and a six-way reversing valve, the main oil inlet pipe is connected to the inlet of the two-way reversing valve, the first oil outlet pipe of the two-way reversing valve is connected to the three-dimensional oil inlet of the four-way reversing valve, the oil return port of the four-way reversing valve is connected to the main oil return pipeline, each spacing adjusting cylinder is connected in parallel to the first working oil port and the second working oil port of the four-way reversing valve, a flow valve is provided on the parallel pipeline of each spacing adjusting cylinder, the second oil outlet pipe of the two-way reversing valve is connected to the three-dimensional oil inlet of the six-way reversing valve, the oil return port of the six-way reversing valve is connected to the main oil return pipeline, the hydraulic motor is connected to the first working oil port and the second working oil port of the six-way reversing valve, and the swing cylinder is connected to the third working oil port and the fourth working oil port of the six-way reversing valve.

7. A casing power tong with a backup tong as claimed in claim 6, characterized in that: A flow valve is arranged on the parallel pipeline of each spacing regulating cylinder.

8. The casing power tong with backup tongs according to claim 6, characterized in that: The main oil return pipe is provided with an overflow valve.

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