Remote automatic power tong hydraulic system and power tong device

Abstract

The invention relates to the technical field of drilling wellhead operation equipment, in particular to a remote automatic power tong hydraulic system and a power tong device.The remote automatic power tong hydraulic system comprises a clamping oil cylinder used for controlling a power tong jaw to clamp a tubular column, a rotary motor used for controlling the power tong jaw to rotate to unscrew the tubular column, and a moving oil cylinder used for driving a power tong to move front and back; the lifting oil cylinder is used for driving the power tongs to lift; the clamping oil cylinder and the rotary motor are arranged in parallel, so that the power tong jaw rotates and clamps the tubular column at the same time; a hydraulic circuit used for controlling the clamping oil cylinder and the rotary motor comprises a first electromagnetic directional valve and a second electromagnetic directional valve, and the first electromagnetic directional valve and the second electromagnetic directional valve are arranged in parallel so as to control the rotating speed of the rotary motor.

Description

Technical Field

[0001] The invention relates to the technical field of drilling wellhead operation equipment, and in particular to a remote automated power tongs hydraulic system and a power tongs device. Background Art

[0002] Hydraulic power tongs are an automated tool used to unscrew and remove threads on drill pipes or tubing columns during drilling. During the drilling process, the work of unscrewing and removing threads becomes more frequent, and the workload of the hydraulic power tongs increases accordingly.

[0003] Traditional hydraulic power tongs still require operators to operate at close range at the hole mouth. At the same time, because the position of the thread that needs to be unscrewed in the pipe column is usually not fixed when unscrewing and removing the pipe column, the position of the power tongs must be manually adjusted to unscrew the thread, which is labor-intensive. In addition, the working environment at the hole mouth is generally poor, the safety factor is low, and danger is prone to occur.

[0004] In order to better improve safety and reduce the labor intensity of operators, a remote automated power tongs hydraulic system and a power tongs device are urgently needed, which can realize the remote control and operation of the power tongs and have the function of manual control. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a remote automated power tong hydraulic system and a power tong device, which solve the technical problem that the prior power tongs cannot fully automatically make-up and make-out of the pipe string.

[0007] (II) Technical solution

[0008] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0009] A remote automated power tong hydraulic system, comprising: a clamping cylinder for controlling the power tong jaws to clamp a pipe string, a rotary motor for controlling the power tong jaws to rotate and unscrew the pipe string, a moving cylinder for driving the power tongs to move forward and backward, and a lifting cylinder for driving the power tongs to move up and down;

[0010] The clamping cylinder and the rotary motor are arranged in parallel so that the power tong jaws rotate and clamp the pipe string at the same time;

[0011] The hydraulic circuit for controlling the clamping cylinder and the rotary motor comprises a first electromagnetic reversing valve and a second electromagnetic reversing valve, wherein the first electromagnetic reversing valve and the second electromagnetic reversing valve are arranged in parallel to control the rotation speed of the rotary motor.

[0012] The hydraulic circuit of the mobile oil cylinder includes a proportional directional valve and a third electromagnetic reversing valve; the proportional directional valve is connected to the oil inlet circuit and is used to control the moving speed of the mobile oil cylinder;

[0013] The third electromagnetic reversing valve is connected to the oil inlet circuit and the oil return circuit, and is used to control the movement of the moving cylinder.

[0014] The hydraulic circuit of the mobile oil cylinder further includes a first hydraulic lock, which is connected between the third electromagnetic reversing valve and the mobile oil cylinder;

[0015] When the third electromagnetic reversing valve is in the middle position, the first hydraulic lock locks the oil return circuit, so that the mobile cylinder remains stationary under load; when the third electromagnetic reversing valve is in the left position or the right position, the first hydraulic lock controls the oil inlet circuit to open, so that the mobile cylinder can move.

[0016] The hydraulic circuit of the mobile oil cylinder includes an automatic control state and a manual control state, the proportional directional valve is connected in parallel with a ball valve, and the ball valve is connected to the oil inlet circuit;

[0017] The movable oil cylinder is in the automatic control state, the ball valve is closed, and the proportional directional valve is opened;

[0018] When the movable oil cylinder is in manual control state, the ball valve is opened and the proportional directional valve is closed.

[0019] The hydraulic circuit of the moving oil cylinder further comprises a pressure reducing valve, which is connected to an oil inlet circuit and is used to adjust the oil inlet circuit pressure of the hydraulic circuit of the moving oil cylinder to a pressure required by the hydraulic circuit.

[0020] The hydraulic circuit of the lifting cylinder includes a fourth electromagnetic reversing valve and a two-way throttling speed regulating valve;

[0021] The fourth electromagnetic reversing valve is connected to the oil inlet circuit and the oil return circuit, and is used to control the movement of the lifting cylinder;

[0022] The two-way throttling speed regulating valve is connected between the fourth electromagnetic reversing valve and the lifting cylinder, and the two-way throttling speed regulating valve is used to adjust the moving speed of the lifting cylinder.

[0023] The hydraulic circuit of the lifting cylinder further includes a second hydraulic lock, which is connected between the fourth electromagnetic reversing valve and the two-way throttling speed regulating valve;

[0024] When the fourth electromagnetic reversing valve is in the middle position, the second hydraulic lock locks the oil in the oil circuit between the lifting cylinder and the second hydraulic lock, so that the lifting cylinder remains stationary under load;

[0025] When the fourth electromagnetic reversing valve is in the left position or the right position, the second hydraulic lock controls the oil inlet circuit to open, so that the lifting cylinder can move.

[0026] It also includes a control system, which is used to control the movement strokes of the clamping cylinder, the rotary motor, the moving cylinder and the lifting cylinder.

[0027] A pressure sensor and a pressure gauge are provided on the hydraulic circuit of the clamping oil cylinder and the rotary motor, and the pressure sensor and the pressure gauge are connected to the control system;

[0028] After the pressure sensor detects that the pipeline pressure reaches a preset value, the control system controls the first electromagnetic reversing valve and the second electromagnetic reversing valve to return to the middle position, and the clamping cylinder and the rotary motor stop working.

[0029] A power tongs device, using the remote automated power tongs hydraulic system, comprises: a sliding chassis, a frame body, a lifting mechanism, a power tongs, a driving device and a control device, wherein the power tongs is suspended at the front end of the lifting mechanism, and the lifting mechanism is slidably connected to the frame body; the power tongs and the driving device are connected to the control device;

[0030] The driving device includes a clamping cylinder for controlling the power tongs to clamp the pipe string, a rotary motor for controlling the power tongs to rotate and unscrew the pipe string, a moving cylinder for controlling the frame body to move forward and backward along the sliding base, and a lifting cylinder for controlling the lifting mechanism to move up and down along the frame body.

[0031] (III) Beneficial effects

[0032] The beneficial effects of the present invention are as follows: the present invention provides a remote automated power tongs hydraulic system, which is applied to the power tongs, and realizes remote and fully automated control of the power tongs device through the control system, the hydraulic circuit of the rotary motor, the hydraulic circuit of the clamping cylinder, the hydraulic circuit of the moving cylinder and the hydraulic circuit of the lifting cylinder, and can also realize manual control of the local hydraulic circuit during equipment failure or debugging.

[0033] By connecting the rotary motor and the clamping cylinder of the power tong in parallel, the power tong can automatically and synchronously clamp the pipe string when making up or breaking out the pipe string.

[0034] By setting the first electromagnetic reversing valve and the second electromagnetic reversing valve in parallel, the rotation speed of the rotary motor is increased, thereby increasing the speed of making and breaking the pipe string. At the same time, the rotary motor has a speed regulation function. In the automatic control state, the rotary motor can switch between high-speed rotation and low-speed rotation. In the manual control state, the rotary motor rotates at a low speed, which is safer to use.

[0035] By setting the pressure reducing valve and proportional directional valve, the control accuracy of the mobile cylinder's movement can be improved, the moving speed can be precisely controlled, and the drilling tool can be prevented from being hit or bent. By setting the two-way throttling speed regulating valve to control the moving speed of the lifting cylinder, the adjustment of the lifting cylinder's micro distance can be achieved.

[0036] The hydraulic circuit of the mobile cylinder is also provided with a ball valve, which is arranged in parallel with the proportional directional valve. The ball valve is arranged to realize the switching between automatic control and manual control of the mobile cylinder, so as to avoid the power clamp being unable to move in a fault state, affecting the use of the pipe string or other equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a hydraulic circuit diagram of the remote automated power tongs hydraulic system of the present invention;

[0038] Figure 2 It is a three-dimensional view of the power clamp device of the present invention.

[0039] [Description of Reference Numerals]

[0040] 11: Clamping cylinder; 12: Rotary motor; 13: First solenoid reversing valve; 14: Second solenoid reversing valve; 15: Pressure sensor; 16: Pressure gauge; 17: Travel switch;

[0041] 21: mobile cylinder; 22: third electromagnetic reversing valve; 23: pressure reducing valve; 24: proportional directional valve; 25: ball valve; 26: first hydraulic lock;

[0042] 31: lifting cylinder; 32: fourth electromagnetic reversing valve; 33: two-way throttling speed regulating valve; 34: second hydraulic lock;

[0043] 41: Oil inlet pressure measuring port; 42: Oil return pressure measuring port; 43: Displacement sensor;

[0044] 5: Sliding chassis;

[0045] 6: Main body of the rack;

[0046] 7: lifting mechanism; 71: first sliding inner frame; 72: second sliding inner frame; 73: pulley;

[0047] 8: power tongs; 81: power tongs jaws;

[0048] 9: Floating mechanism. DETAILED DESCRIPTION

[0049] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0050] The present invention provides a remote automated power tong hydraulic system, which connects a rotary motor 12 and a power tong clamping cylinder 11 in parallel, so that the power tong 8 can automatically and synchronously clamp the pipe column when the pipe column is being made or broken. The control system includes automatic control and manual control. In the automatic control state, the parallel first electromagnetic reversing valve 13 and the second electromagnetic reversing valve 14 are energized at the same time, so that the rotary motor 12 is supplied with oil through the dual oil circuits, and the rotation speed of the rotary motor 12 is increased, thereby increasing the speed of making and breaking the pipe column. When it is necessary to adjust the rotation speed of the rotary motor 12, it is only necessary to adjust the second electromagnetic reversing valve 14 to the middle position, so that the double oil port oil inlet is changed to the single oil port oil inlet, and the rotary motor 12 can be controlled to rotate slowly. At the same time, when the rotary motor 12 is rotating slowly, the power tong 8 can be manually controlled, which is safer for operators to use.

[0051] By setting the pressure reducing valve 23 and the proportional directional valve 24, the control accuracy of the moving action of the moving cylinder 21 is improved, the moving speed is precisely controlled, and the drilling tool is prevented from being hit and bent. By setting the two-way throttling speed regulating valve 33 to control the moving speed of the lifting cylinder 31, the adjustment of the lifting cylinder 31 by a small distance can be realized.

[0052] The hydraulic circuit of the mobile oil cylinder 21 is also provided with a ball valve 25, which is arranged in parallel with the proportional directional valve 24. In the automatic control state, the ball valve 25 is closed, and the proportional directional valve 24 and the third electromagnetic reversing valve 22 are connected in series to achieve precise control of the movement of the mobile oil cylinder 21. If the third electromagnetic reversing valve 22 is in a power-off state, or the proportional directional valve 24 fails, the oil circuit of the proportional directional valve 24 is blocked, and manual operation is required at this time. By opening the ball valve 25, the third electromagnetic reversing valve 22 can be manually controlled to pass oil. This prevents the power tongs 8 from being unable to be retracted in a fault state, affecting the use of the pipe string or other equipment.

[0053] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0054] Embodiment 1:

[0055] See attached Figure 1The embodiment of the present invention provides a remote automated power tong hydraulic system, which is applied to a power tong device, and includes: a control system, which is used to control the clamping cylinder 11 of the power tong jaws 81 to clamp the pipe string, a rotary motor 12 for controlling the power tong jaws 81 to rotate and unscrew the pipe string, a moving cylinder 21 for driving the power tong 8 to move forward and backward, and a lifting cylinder 31 for driving the power tong 8 to move up and down. The control system is used to control the remote automated power tong hydraulic system, including controlling the movement stroke of the above-mentioned actuators (clamping cylinder 11, rotary motor 12, moving cylinder 21 and lifting cylinder 31), and the control form includes automatic control and manual control.

[0056] The clamping cylinder 11 and the rotary motor 12 are arranged in parallel, so that the power tongs 8 automatically and synchronously clamp the pipe string when the power tongs 8 unscrew the pipe string. The hydraulic circuit for controlling the clamping cylinder 11 and the rotary motor 12 includes a first electromagnetic reversing valve 13 and a second electromagnetic reversing valve 14, which are arranged in parallel. The first electromagnetic reversing valve 13 and the second electromagnetic reversing valve 14 simultaneously feed oil, thereby increasing the oil feeding speed of the clamping cylinder 11 and the rotary motor 12, making the rotary motor 12 rotate faster, and making and breaking the pipe string faster.

[0057] The first electromagnetic reversing valve 13 adopts an O-type middle position function, and the second electromagnetic reversing valve 14 adopts a Y-type middle position function. The first electromagnetic reversing valve 13 and the second electromagnetic reversing valve 14 are both three-position electromagnetic reversing valves. When the first electromagnetic reversing valve 13 and the second electromagnetic reversing valve 14 are in the middle position, the clamping cylinder 11 and the rotary motor 12 stop working. When the first electromagnetic reversing valve 13 and the second electromagnetic reversing valve 14 are in the left position or the right position, the movement direction of the clamping cylinder 11 and the rotary motor 12 is controlled by changing the oil inlet and return paths.

[0058] When the remote automated power tong hydraulic system is in automatic control, the first electromagnetic reversing valve 13 and the second electromagnetic reversing valve 14 are energized at the same time, controlling the rotation of the swing motor 12 to make and break the bend, increasing the oil intake speed of the swing motor 12 and making the rotation speed of the swing motor 12 faster. When the first electromagnetic reversing valve 13 and the second electromagnetic reversing valve 14 are energized, the clamping cylinder 11 synchronously feeds oil to control the power tong 8 to clamp the pipe string.

[0059] By setting the first electromagnetic reversing valve 13 and the second electromagnetic reversing valve 14 in parallel, the rotation speed of the rotary motor 12 can be switched. When it is necessary to control the rotation speed of the power tongs 8 for buckling and unbuckling, the oil intake of the rotary motor 12 is changed by controlling the second electromagnetic reversing valve 14, thereby switching the rotation speed of the rotary motor 12. That is, when it is necessary to switch to high-speed rotation, the first electromagnetic reversing valve 13 and the second electromagnetic reversing valve 14 are energized at the same time, and the first electromagnetic reversing valve 13 and the second electromagnetic reversing valve 14 are adjusted to the left position or the right position at the same time, and the rotary motor 12 is fed with oil through the oil inlet of the first electromagnetic reversing valve 13 and the second electromagnetic reversing valve 14 at the same time. The oil intake speed is faster through the dual oil circuits, and the rotary motor 12 rotates at a high speed. When it is necessary to switch from high-speed rotation to low-speed rotation, the first electromagnetic reversing valve 13 is adjusted to the middle position, the second electromagnetic reversing valve 14 is in the left position or the right position, and the first electromagnetic reversing valve 13 adopts the O-position middle position function, closes one oil circuit, and changes the double oil inlet circuit to a single oil inlet circuit, changes the oil inlet speed of the rotary motor 12, and does not affect the oil return circuit, thereby adjusting the speed of the rotary motor 12. At the same time, in the single oil circuit oil inlet state, the rotary motor 12 has a slow speed, which is more suitable for the working condition that requires manual control of the power clamp 8.

[0060] Furthermore, in order to prevent the power tongs 8 from using excessive force and damaging the pipe column during the automatic make-up and make-out process, a pressure sensor 15 and a pressure gauge 16 are provided on the circuit of the clamping cylinder 11 and the rotary motor 12, which can display the make-up and make-out torque in real time. Before the make-up or make-out operation, the torque required by different drill strings can be set in advance through the control system. After the pressure sensor 15 detects that the pipeline pressure reaches the set value, the first electromagnetic reversing valve 13 and the second electromagnetic reversing valve 14 are controlled to return to the middle position, and the oil supply is stopped to prevent the rotary motor 12 from damaging the drill string coupling.

[0061] The first electromagnetic reversing valve 13 and the second electromagnetic reversing valve 14 adopt a dual control mode of remote electric control and manual control, that is, remote automatic control can be performed, and manual operation in an emergency state can also be achieved.

[0062] The hydraulic circuit of the mobile oil cylinder 21 includes a proportional directional valve 24, a third electromagnetic reversing valve 22 and a first hydraulic lock 26. The proportional directional valve 24 is connected to the oil inlet, and controls the extension and retraction speed of the mobile oil cylinder 21 by controlling the flow of the oil inlet, thereby controlling the moving speed of the power tongs 8. The third electromagnetic reversing valve 22 adopts a three-position electromagnetic reversing valve. The third electromagnetic reversing valve 22 is used to control whether the mobile oil cylinder 21 is extended and retracted, thereby controlling whether the power tongs 8 moves, and controlling the moving direction of the power tongs 8. When the third electromagnetic reversing valve 22 is in the middle position, the mobile oil cylinder 21 stops moving. When the third electromagnetic reversing valve 22 is in the left position or the right position, the extension and retraction of the mobile oil cylinder 21 is controlled by changing the oil inlet and return oil paths, thereby realizing the control of the moving direction of the power tongs 8. In the automatic control state, the precise control of the moving action of the mobile oil cylinder 21 is realized by the combination of the third electromagnetic reversing valve 22 and the proportional directional valve 24.

[0063] The first hydraulic lock 26 is used to lock the oil in the oil return circuit when the third electromagnetic reversing valve 22 of the oil circuit is in the middle position, ensuring that the mobile cylinder 21 is stationary under load, that is, the mobile cylinder 21 stops moving and is in a standby state. When the third electromagnetic reversing valve 22 is in the left or right position, the hydraulic lock is controlled to open the oil inlet circuit to realize the cylinder action.

[0064] The hydraulic circuit of the mobile cylinder 21 also includes a ball valve 25 connected in parallel with the proportional directional valve 24. The ball valve 25 is connected to the oil inlet. If it is in automatic control state, the ball valve 25 is closed, and the proportional directional valve 24 and the third electromagnetic reversing valve 22 are connected in series to achieve precise control of the moving action of the mobile cylinder 21.

[0065] If the third electromagnetic reversing valve 22 is in a power-off state, or the proportional directional valve 24 fails, the oil circuit of the proportional directional valve 24 is blocked, and manual operation is required at this time. By opening the ball valve 25, the third electromagnetic reversing valve 22 can be manually controlled to pass oil, and the moving action of the moving cylinder 21 can be controlled. By setting the ball valve 25, manual operation of the moving cylinder 21 can be realized in an emergency.

[0066] The hydraulic circuit of the mobile oil cylinder 21 also includes a pressure reducing valve 23, which is connected to the oil inlet. The pressure reducing valve 23 is used to adjust the oil inlet pressure of the hydraulic circuit of the mobile oil cylinder 21 to the required pressure of the hydraulic circuit. That is, the oil inlet pressure before the pressure reducing valve 23 is large, and the pressure can be adjusted by the pressure reducing valve 23. By setting the pressure reducing valve 23, the oil outlet pressure can be automatically kept stable. The preset pressure can be set by the control system, and the pressure reducing valve 23 is controlled to be adjusted to the preset pressure.

[0067] Since the mobile oil cylinder 21 controls the power tongs 8 to move forward and backward, there is a possibility of hitting the pipe string. Therefore, the pressure is reduced by setting the pressure reducing valve 23 to prevent the mobile oil cylinder 21 from controlling the power tongs 8 to hit the drill bit. By setting the proportional directional valve 24, the moving speed of the mobile oil cylinder 21 can be more finely controlled. By combining the pressure reducing valve 23 and the proportional directional valve 24, the moving action of the mobile oil cylinder 21 can be accurately controlled.

[0068] Since the position of each pipe coupling will be slightly different during the drilling operation, it is necessary to improve the moving accuracy of the lifting cylinder 31 so that the lifting cylinder 31 can be adjusted by a small distance. The hydraulic circuit of the lifting cylinder 31 includes a fourth electromagnetic reversing valve 32, a second hydraulic lock 34 and a two-way throttling speed regulating valve 33. The fourth electromagnetic reversing valve 32 adopts a three-position electromagnetic reversing valve. The fourth electromagnetic reversing valve 32 is used to adjust the moving direction of the lifting cylinder 31, that is, to adjust the extension and contraction of the lifting cylinder 31. The second hydraulic lock 34 is used to lock the oil return circuit when the fourth electromagnetic reversing valve 32 of the oil circuit is in the middle position, to ensure that the moving cylinder 21 is stationary under load, that is, the moving cylinder 21 stops moving at this time and is in a standby state. When the fourth electromagnetic reversing valve 32 is in the left position or the right position, the oil inlet circuit is controlled to open the one-way valve to realize the cylinder action. The two-way throttle speed regulating valve 33 is used to limit the oil inlet flow and the oil return flow of the fourth electromagnetic reversing valve 32, and adjust the moving speed of the lifting cylinder 31 to achieve the adjustment of the small distance of the lifting cylinder 31. At the same time, since the lifting cylinder 31 controls the power tongs 8 to move slowly up and down along the drilling tool, it is different from the moving cylinder 21 and will not affect the drilling tool. It only needs to consider the lifting and lowering movement accuracy of the power tongs 8. Therefore, the moving speed of the lifting cylinder 31 can be controlled by setting the two-way throttle speed regulating valve 33.

[0069] The third electromagnetic reversing valve 22 and the fourth electromagnetic reversing valve 32 adopt two control modes, namely, electric control and manual control, so that they can be remotely automatically controlled or manually operated in an emergency.

[0070] The oil inlet and oil return paths of each hydraulic circuit are provided with an oil inlet pressure measuring port 41 and an oil return pressure measuring port 42, respectively. The pressure measuring ports are used to measure the hydraulic pressure of the oil circuit and feed it back to the control system.

[0071] Embodiment 2:

[0072] A camera is installed on the power tongs head, and the camera is connected to the control system. The operator can observe the position of the pipe coupling and the power tongs head in real time in the driller's room through the camera installed on the power tongs head, so as to fine-tune the height of the power tongs 8.

[0073] Among them, the driller's room is a workshop with integrated control system and display system. The operator can operate the control system and display system in the driller's room, thereby realizing remote control of the remote automated power tongs hydraulic system.

[0074] Embodiment 3:

[0075] The mobile cylinder 21 and the lifting cylinder 31 are provided with a displacement sensor 43, which displays the moving position in real time on a display screen in the driller's room through a digital signal, so that the operator can check the position of the mobile cylinder 21 and the lifting cylinder 31 in real time.

[0076] Embodiment 4:

[0077] A double-travel switch 17 is installed on the power tongs head. The double-travel switch 17 is used to detect the make-up and make-out strokes of the power tongs 8 respectively. The make-up and make-out strokes of each pipe string are fixed and can be set in the control system.

[0078] Embodiment 5:

[0079] See attached Figure 2 The embodiment of the present invention provides a power tong device, which adopts the above remote automated power tong hydraulic system, and includes: a sliding chassis 5, a frame body 6, a lifting mechanism 7, a power tong 8, a driving device and a control device, wherein the power tong 8 is suspended at the front end of the lifting mechanism 7, and the lifting mechanism 7 is slidably connected to the frame body 6. The control device is connected to the control system, and the power tong 8 and the driving device are connected to the control device, so as to realize full automated control of the power tong device.

[0080] The power tongs 8 include a power tong jaw 81 for making and breaking the pipe string. The driving device includes a clamping cylinder 11 for controlling the power tong jaw 81 to clamp the pipe string, a rotary motor 12 for controlling the power tong jaw 81 to rotate and break the pipe string, a moving cylinder 21 for controlling the frame body 6 to move forward and backward along the sliding base 5, and a lifting cylinder 31 for controlling the lifting mechanism 7 to move up and down along the frame body 6.

[0081] The lifting mechanism 7 includes a first sliding inner frame 71 and a second sliding inner frame 72. The second sliding inner frame 72, the first sliding inner frame 71 and the frame body 6 are slidably connected from the inside to the outside. The power tongs 8 are suspended on the front side of the second sliding inner frame 72. The top of the second sliding inner frame 72 is connected to the floating mechanism 9.

[0082] A pulley 73 is provided at the top of the first sliding inner frame 71 , and one end of a steel wire rope (not shown) used to pull the second sliding inner frame 72 is connected to the floating mechanism 9 through the pulley 73 , and the other end of the steel wire rope (not shown) is connected to the frame body 6 .

[0083] The moving cylinder 21 is arranged on both sides of the frame body 6 , the telescopic end of the moving cylinder 21 is connected to the sliding base frame 5 , the connecting end of the moving cylinder 21 is connected to the frame body 6 , and the moving cylinder 21 drives the frame body 6 to slide along the sliding base frame 5 .

[0084] The lifting cylinder 31 is arranged on the rear side of the first sliding inner frame 71 , the connecting end of the lifting cylinder 31 is connected to the frame body 6 , the telescopic end of the lifting cylinder 31 is connected to the first sliding inner frame 71 , and the lifting cylinder 31 drives the first sliding inner frame 71 to slide along the vertical direction of the frame body 6 .

[0085] By controlling the power tong device through the remote automated power tong hydraulic system, remote fully automated control of the power tong device can be achieved.

[0086] The method for controlling the make-up and break-out of the power tong device by a hydraulic system comprises the following steps:

[0087] Step 1: Control the power clamp 8 to move to the orifice position by moving the oil cylinder 21;

[0088] Step 2: Control the power tongs 8 to move to the pipe string coupling position through the lifting cylinder 31;

[0089] Step 3: The power tong jaws 81 are controlled by the clamping cylinder 11 to clamp the pipe coupling. At the same time, the power tong jaws 81 are controlled to rotate by the rotary motor 12 to make or break the pipe coupling.

[0090] An embodiment of the present invention provides a remote automated power tongs hydraulic system, which is applied to a power tongs device. The system realizes remote and fully automated control of the power tongs device through a control system, a hydraulic circuit of a rotary motor 12, a hydraulic circuit of a clamping cylinder 11, a hydraulic circuit of a moving cylinder 21, and a hydraulic circuit of a lifting cylinder 31, and can also realize manual control of a local hydraulic circuit during equipment failure or debugging.

[0091] By connecting the rotary motor 12 and the power tong clamping cylinder 11 in parallel, the power tong 8 can automatically and synchronously clamp the pipe string when making up or breaking out the pipe string.

[0092] By setting the first electromagnetic reversing valve 13 and the second electromagnetic reversing valve 14 in parallel, the rotation speed of the rotary motor 12 is increased, thereby increasing the speed of making and breaking the pipe string. At the same time, the rotary motor 12 has a speed regulation function. In the automatic control state, the rotary motor 12 can rotate at high speed and low speed. In the manual control state, the rotary motor 12 rotates at low speed, which is safer to use.

[0093] By setting the pressure sensor 15 and the pressure gauge 16, the make-up and break-out torque can be displayed in real time. Before the make-up or break-out operation, the torque required by different drill strings can be set in advance through the control system. After the pressure sensor 15 detects that the pipeline pressure reaches the set value, the first electromagnetic reversing valve 13 and the second electromagnetic reversing valve 14 are controlled to return to the middle position.

[0094] By setting the pressure reducing valve 23 and the proportional directional valve 24, the control accuracy of the moving action of the moving cylinder 21 is improved, the moving speed is precisely controlled, and the drilling tool is prevented from being hit and bent. By setting the two-way throttling speed regulating valve 33 to control the moving speed of the lifting cylinder 31, the adjustment of the lifting cylinder 31 by a small distance can be realized.

[0095] The hydraulic circuit of the mobile cylinder 21 is also provided with a ball valve 25, which is arranged in parallel with the proportional directional valve 24. The ball valve 25 is provided to realize the switching between automatic control and manual control of the mobile cylinder 21, so as to avoid the power clamp 8 being unable to move in a fault state, affecting the use of the pipe string or other equipment.

[0096] By setting up monitoring equipment, the control system and display system are integrated, allowing operators to observe the operating conditions in real time from a distance.

[0097] 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.

[0098] 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 an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0099] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0100] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. 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 representations of the above terms do 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. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0101] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A remote automated power tongs hydraulic system, characterized in that: include: A clamping cylinder (11) for controlling the power tongs jaws (81) to clamp the pipe column, a rotary motor (12) for controlling the power tongs jaws (81) to rotate and unscrew the pipe column, a moving cylinder (21) for driving the power tongs (8) to move forward and backward, and a lifting cylinder (31) for driving the power tongs (8) to move up and down; The clamping cylinder (11) and the rotary motor (12) are arranged in parallel so that the power tongs jaws (81) rotate and clamp the pipe column at the same time; The hydraulic circuit for controlling the clamping cylinder (11) and the rotary motor (12) comprises a first electromagnetic reversing valve (13) and a second electromagnetic reversing valve (14), wherein the first electromagnetic reversing valve (13) and the second electromagnetic reversing valve (14) are arranged in parallel to control the rotation speed of the rotary motor (12).

2. The remote automated power tongs hydraulic system according to claim 1, characterized in that: The hydraulic circuit of the movable oil cylinder (21) comprises a proportional directional valve (24) and a third electromagnetic reversing valve (22); the proportional directional valve (24) is connected to the oil inlet circuit and is used to control the moving speed of the movable oil cylinder (21); The third electromagnetic reversing valve (22) is connected to the oil inlet circuit and the oil return circuit, and is used to control the movement of the moving oil cylinder (21).

3. The remote automated power tongs hydraulic system according to claim 2, characterized in that: The hydraulic circuit of the movable oil cylinder (21) further comprises a first hydraulic lock (26), wherein the first hydraulic lock (26) is connected between the third electromagnetic reversing valve (22) and the movable oil cylinder (21); When the third electromagnetic reversing valve (22) is in the middle position, the first hydraulic lock (26) locks the oil in the oil return circuit, so that the movable oil cylinder (21) remains stationary under load; when the third electromagnetic reversing valve (22) is in the left position or the right position, the first hydraulic lock (26) controls the oil inlet circuit to open, so that the movable oil cylinder (21) can move.

4. The remote automated power tongs hydraulic system according to claim 3, characterized in that: The hydraulic circuit of the mobile oil cylinder (21) includes an automatic control state and a manual control state, the proportional directional valve (24) is connected in parallel with a ball valve (25), and the ball valve (25) is connected to an oil inlet circuit; When the movable oil cylinder (21) is in an automatic control state, the ball valve (25) is closed and the proportional directional valve (24) is opened; When the moving oil cylinder (21) is in a manual control state, the ball valve (25) is opened and the proportional directional valve (24) is closed.

5. The remote automated power tongs hydraulic system according to claim 3, characterized in that: The hydraulic circuit of the mobile oil cylinder (21) further comprises a pressure reducing valve (23), wherein the pressure reducing valve (23) is connected to an oil inlet circuit, and the pressure reducing valve (23) is used to adjust the oil inlet circuit pressure of the hydraulic circuit of the mobile oil cylinder (21) to a pressure required by the hydraulic circuit.

6. The remote automated power tongs hydraulic system according to claim 1, characterized in that: The hydraulic circuit of the lifting cylinder (31) comprises a fourth electromagnetic reversing valve (32) and a two-way throttling speed regulating valve (33); The fourth electromagnetic reversing valve (32) is connected to the oil inlet circuit and the oil return circuit, and is used to control the movement of the lifting cylinder (31); The two-way throttling speed regulating valve (33) is connected between the fourth electromagnetic reversing valve (32) and the lifting cylinder (31), and the two-way throttling speed regulating valve (33) is used to adjust the moving speed of the lifting cylinder (31).

7. The remote automated power tongs hydraulic system according to claim 6, characterized in that: The hydraulic circuit of the lifting cylinder (31) further comprises a second hydraulic lock (34), wherein the second hydraulic lock (34) is connected between the fourth electromagnetic reversing valve (32) and the two-way throttling speed regulating valve (33); When the fourth electromagnetic reversing valve (32) is in the middle position, the second hydraulic lock (34) locks the oil in the oil circuit between the lifting cylinder (31) and the second hydraulic lock (34), so that the lifting cylinder (31) remains stationary under load; When the fourth electromagnetic reversing valve (32) is in the left position or the right position, the second hydraulic lock (34) controls the oil inlet circuit to open, so that the lifting cylinder (31) can move.

8. The remote automated power tongs hydraulic system according to claim 1, characterized in that: It also includes a control system, which is used to control the movement strokes of the clamping cylinder (11), the rotary motor (12), the moving cylinder (21) and the lifting cylinder (31).

9. The remote automated power tongs hydraulic system according to claim 8, characterized in that: A pressure sensor (15) and a pressure gauge (16) are provided on the hydraulic circuit of the clamping oil cylinder (11) and the rotary motor (12), and the pressure sensor (15) and the pressure gauge (16) are connected to the control system; After the pressure sensor (15) detects that the pipeline pressure reaches a preset value, the control system controls the first electromagnetic reversing valve (13) and the second electromagnetic reversing valve (14) to return to the middle position, and the clamping cylinder (11) and the rotary motor (12) stop working.

10. A power clamp device, characterized in that: The remote automated power tongs hydraulic system according to any one of claims 1 to 9 comprises: a sliding chassis (5), a frame body (6), a lifting mechanism (7), a power tongs (8), a driving device and a control device, wherein the power tongs (8) is suspended at the front end of the lifting mechanism (7), and the lifting mechanism (7) is slidably connected to the frame body (6); the power tongs (8) and the driving device are connected to the control device; The driving device comprises a clamping cylinder (11) for controlling the power tong jaws (81) to clamp a pipe column, a rotary motor (12) for controlling the power tong jaws (81) to rotate and unscrew the pipe column, a moving cylinder (21) for controlling the frame body (6) to move forward and backward along the sliding base (5), and a lifting cylinder (31) for controlling the lifting mechanism (7) to move up and down along the frame body (6).

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