Automatic hydraulic clamping and slipping protection device and control method for intelligent well repairing operation in oil fields

Abstract

The present invention belongs to the technical field of automatic hydraulic pliers for well repair, and in particular to an automatic hydraulic pliers clamping and slippage protection device and control method for intelligent well repair operations in oil fields, comprising a frame and a protection component installed on the surface of one end of the frame, a guide rod limit seat fixedly installed on the side of the frame, and judging whether the hydraulic pliers back-up pliers are working normally by detecting the torque curve converted by the pressure transmitter and the torque curve trend of the force multiplied by the force arm measured by the first force sensor and the second force sensor, and judging whether the hydraulic pliers back-up pliers are in a slippage state by comparing the pressure difference of the pressure transmitter of the hydraulic motor and the state of deviation of the curve data of the first force sensor and the second force sensor, timely and accurately detecting the abnormal working state of the back-up pliers slippage, and controlling the hydraulic pliers to stop and alarm through the control system to ensure the inherent safety of the equipment during operation.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic hydraulic pliers for well repair, and in particular relates to a clamping and slipping protection device and a control method of automatic hydraulic pliers for intelligent well repair operations in oil fields. Background Art

[0002] Automatic hydraulic tongs have the functions of automatic extension and retraction, automatic buckle making and breaking, and resetting. They replace the original manually operated push-pull hydraulic tongs for buckle making and breaking in well repair rig operations, reducing labor intensity and safety risks. They are widely used in today's well repair operations. During well repair operations, when automatic hydraulic tongs are making and breaking pipe threads, due to factors such as pipe diameter deviation, wear of hydraulic tongs teeth, and misalignment of the jaws with the center of the pipe, the contact between the back-up tongs teeth and the pipe surface is insufficient, the bite force becomes smaller, and the two slip relative to each other. Conventional manually operated hydraulic tongs use a wire rope to end the rope on the derrick. When the back-up tongs slip and the main tongs rotate continuously, the torque is offset by the safety tail rope to ensure the safety of personnel and equipment.

[0003] However, the current automatic make-up and break-out device can no longer use the safety tail rope method, and there is no back-up clamp slippage detection and protection control. During the automatic make-up and break-out process, after the back-up clamp slips, the torque of the break-out rotation on the main clamp will be transmitted to the boom and other non-torsion-bearing parts, causing serious malfunctions and damage to the hydraulic clamp under abnormal working conditions.

[0004] In order to solve the above problems, the present application proposes an automatic hydraulic clamping and slipping protection device and a control method for intelligent well repair operations in oil fields. Summary of the invention

[0005] To solve the problems raised in the above background technology. The present invention provides an automatic hydraulic tongs clamping and slipping protection device and control method for intelligent well repairing operations in oil fields, which determines whether the hydraulic tongs back-up tongs are working normally by detecting the torque curve converted by the pressure transmitter and the torque curve trend of the force multiplied by the force arm measured by the first force sensor and the second force sensor, and determines whether the hydraulic tongs back-up tongs are in a slipping state by comparing the pressure difference of the pressure transmitter of the hydraulic motor and the state of deviation of the curve data of the first force sensor and the second force sensor, timely and accurately detects the abnormal working state of the back-up tongs slipping, controls the hydraulic tongs to stop and alarm through the control system, and ensures the inherent safety of the equipment during operation.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: an automatic hydraulic clamping slip protection device for intelligent well repair operations in oil fields, comprising a frame and a protection component installed on the surface of one end of the frame, and a guide rod limit seat is fixedly installed on the side of the frame.

[0007] The protection assembly comprises a hydraulic pliers main tongs and a hydraulic pliers backup tongs. A hydraulic motor is arranged on the side of the hydraulic pliers main tongs. A pressure transmitter is installed on the surface of the hydraulic motor. A rear guide rod seat is fixedly installed on the tail of the hydraulic pliers main tongs. A backup tongs tail seat is fixedly installed on one end of the hydraulic pliers backup tongs.

[0008] The pressure transmitter is connected to and communicates with the oil inlet and outlet of the hydraulic motor.

[0009] A hydraulic pliers rear guide rod is arranged on the surface of the guide rod limiting seat, and the main pliers of the hydraulic pliers are located above the back pliers of the hydraulic pliers.

[0010] The bottom end of the hydraulic pliers rear guide rod passes through the interior of the back pliers tail seat, and the middle end of the hydraulic pliers rear guide rod passes through the interior of the rear guide rod seat.

[0011] The rear guide rod of the hydraulic pliers is rotatably connected to the guide rod limiting seat, the back pliers tail seat and the rear guide rod seat.

[0012] A first force sensor and a second force sensor are installed inside the back-up caliper tailstock, and an end cover is arranged inside the back-up caliper tailstock.

[0013] As a preferred embodiment of the automatic hydraulic tongs clamping and slip protection device for intelligent well repairing operations in oil fields of the present invention, there are two groups of end covers, and the two groups of end covers are symmetrically distributed on both sides of the back-up tongs tailstock.

[0014] As a preferred embodiment of the automatic hydraulic pliers clamping and slip protection device for intelligent well repairing operations in oil fields of the present invention, the first force sensor and the second force sensor are respectively fixed to the surfaces of the two groups of end covers.

[0015] The present invention also provides a control method for clamping a slip protection device of an automatic hydraulic clamp for intelligent well repairing operation in an oil field, comprising the following steps:

[0016] S1. First, start the make-up or make-up unloading, measure the hydraulic motor oil inlet and return pressure difference through the pressure transmitter, and then calculate the make-up and make-up torque according to the pressure difference torque relationship diagram based on the hydraulic clamp model;

[0017] S2, at this time, the first force sensor and the second force sensor installed on the back-up tongs tailstock detect the force generated during the make-up and make-down process, and the make-up and make-down torque is obtained by multiplying the force and the lever arm. The torque curve obtained by the pressure transmitter through the pressure-torque relationship diagram and the torque curve of the force multiplied by the lever arm measured by the first force sensor and the second force sensor are in a synchronous increase and decrease relationship;

[0018] S3. When the torque curve converted by the pressure transmitter has the same trend as the torque curve of the force multiplied by the force arm measured by the first force sensor and the second force sensor, and the torque data fluctuates between 0 and 25 kN·m, it is determined that the hydraulic tongs back-up tongs are not slipping, that is, they are working normally;

[0019] S4, when the main tongs of the hydraulic tongs drive the back tongs of the hydraulic tongs to rotate through the rear guide rod of the hydraulic tongs until the rear guide rod of the hydraulic tongs abuts against the rear guide rod seat, the rear guide rod of the hydraulic tongs will be restricted in rotation by the guide rod limit seat, at this time, the pressure difference between the inlet and return ports of the make-up or make-out hydraulic motor increases, because the rear guide rod of the hydraulic tongs is restricted in rotation by the guide rod limit seat, the rear guide rod of the hydraulic tongs is applied to the guide rod limit seat, and the first force sensor and the second force sensor are not subjected to the force from the rear guide rod of the hydraulic tongs, and the measured data is 0;

[0020] S5. By comparing the pressure difference of the pressure transmitter of the hydraulic motor and the deviation of the curve data of the first force sensor and the second force sensor, it is determined that the hydraulic pliers are in a hydraulic pliers back-up slipping state, that is, an alarm is issued to shut down.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. By setting the pressure transmitter to be connected to the inlet and outlet of the hydraulic motor, the pressure transmitter can measure the motor inlet and return oil pressure difference, and convert it into the make-up and breakout torque according to the pressure difference torque relationship diagram, and then detect the force generated in the make-up and breakout process through the first force sensor and the second force sensor. When the torque curve converted by the pressure transmitter has the same trend as the torque curve of the force multiplied by the force arm measured by the first force sensor and the second force sensor, and the torque data fluctuates between 0 and 25 KN·m, it is judged that the hydraulic tongs back-up tongs are not slipping, and the abnormal working state of the back-up tongs slipping can be detected in time and accurately;

[0023] 2. The rear guide rod of the hydraulic clamp is limited by setting a rear guide rod seat. When the main clamp of the hydraulic clamp drives the hydraulic clamp back clamp to rotate until the hydraulic clamp rear guide rod and the rear guide rod seat are against each other, the hydraulic clamp rear guide rod will be restricted in rotation by the guide rod limit seat. At this time, the pressure difference between the inlet and return oil ports of the make-up or make-up hydraulic motor increases. Since the rear guide rod of the hydraulic clamp is restricted in rotation by the guide rod limit seat, the rear guide rod of the hydraulic clamp is applied to the guide rod limit seat. The first force sensor and the second force sensor are not subjected to the force from the rear guide rod of the hydraulic clamp. Then, the pressure difference of the pressure transmitter of the hydraulic motor and the curve data of the first force sensor and the second force sensor are compared, that is, the torque curve of the pressure transmitter rises normally, and the torque curves of the first force sensor and the second force sensor are in a lower trend or have no fluctuations, then it is determined that the hydraulic clamp is in a hydraulic clamp back clamp slipping state, that is, an alarm is issued to shut down, and the hydraulic clamp is controlled to shut down and an alarm is issued through the control system to ensure the inherent safety of the equipment during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 For the present invention Figure 1 Schematic diagram of the protection component structure;

[0027] Figure 3 It is a schematic diagram of the internal partial structure of the guide rod limiting seat in the present invention;

[0028] Figure 4 It is a schematic diagram of a torque curve when the back-up tongs of the hydraulic tongs of the present invention slip;

[0029] Figure 5 It is a schematic diagram of the torque curve when the hydraulic pliers back-up pliers of the present invention are working normally;

[0030] Figure 6 It is a schematic diagram of the pressure-torque relationship of the present invention (when the hydraulic clamp is 25000 KN·m).

[0031] In the figure:

[0032] 1. Frame; 2. Protection assembly; 3. Guide rod limit seat; 301. Rear guide rod of hydraulic clamp; 302. First force sensor; 303. Second force sensor; 4. Main clamp of hydraulic clamp; 5. Back clamp of hydraulic clamp; 401. Hydraulic motor; 402. Pressure transmitter; 403. Rear guide rod seat; 501. Tail seat of back clamp; 502. End cover. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example: Figure 1-Figure 4 As shown, the present invention provides a technical solution, an automatic hydraulic clamping and slip protection device for intelligent well repairing operations in oil fields, comprising a frame 1 and a protection component 2 installed on the surface of one end of the frame 1, and a guide rod limit seat 3 is fixedly installed on the side of the frame 1 to limit the movement range of the guide rod 301 behind the hydraulic clamp.

[0035] The protection component 2 includes a hydraulic pliers main tongs 4 and a hydraulic pliers backup tongs 5. A hydraulic motor 401 is arranged on the side of the hydraulic pliers main tongs 4. A pressure transmitter 402 is installed on the surface of the hydraulic motor 401. A rear guide rod seat 403 is fixedly installed at the tail of the hydraulic pliers main tongs 4. A backup tongs tail seat 501 is fixedly installed at one end of the hydraulic pliers backup tongs 5. The pressure transmitter 402 is connected and communicated with the inlet and outlet oil ports of the hydraulic motor 401. The pressure difference between the inlet and outlet oil ports of the hydraulic motor 401 during the process of making and breaking the buckle is measured, and the torque of the hydraulic pliers during operation is indirectly obtained through the hydraulic pliers torque and pressure conversion table.

[0036] A hydraulic clamp rear guide rod 301 is arranged on the surface of the guide rod limit seat 3, the hydraulic clamp main clamp 4 is located above the hydraulic clamp back clamp 5, the bottom end of the hydraulic clamp rear guide rod 301 passes through the interior of the back clamp tail seat 501, and the middle end of the hydraulic clamp rear guide rod 301 passes through the interior of the rear guide rod seat 403, bearing most of the torque generated in the make-up and breakout, the hydraulic clamp rear guide rod 301 and the guide rod limit seat 3, the back clamp tail seat 501, and the rear guide rod seat 403 are all rotationally connected, the back clamp tail seat 501 is installed with a first force sensor 302 and a second force sensor 303, the back clamp tail seat 501 is provided with an end cover 502, there are two groups of end covers 502, the two groups of end covers 502 are symmetrically distributed on both sides of the back clamp tail seat 501, and the first force sensor 302 and the second force sensor 303 are respectively fixed on the surfaces of the two groups of end covers 502.

[0037] The working principle and use process of the present invention are as follows: first, the make-up or make-up undocking is started, and the inlet and return oil pressure difference of the hydraulic motor 401 is measured by the pressure transmitter 402, and converted into the make-up and make-up torque according to the pressure difference torque relationship diagram related to the 25000KN·m hydraulic pliers product;

[0038] At this time, the first force sensor 302 and the second force sensor 303 installed on the back-up clamp tailstock 501 detect the force generated during the make-up and make-down process, and the make-up and make-down torque is obtained by multiplying the force and the lever arm. The torque curve converted by the pressure transmitter 402 and the torque curve of the force multiplied by the lever arm measured by the first force sensor 302 and the second force sensor 303 are in a synchronous increase and decrease relationship, that is, the torque curve obtained by the pressure transmitter 402 through the pressure conversion relationship diagram and the torque obtained by the force multiplied by the lever arm measured by the first force sensor 302 and the second force sensor 303 are in a synchronous increase and decrease relationship;

[0039] When the torque curve converted by the pressure transmitter 402 has the same trend as the torque curve of the force multiplied by the force arm measured by the first force sensor 302 and the second force sensor 303 and the torque data fluctuates between 0 and 25 kN·m, it is determined that the hydraulic tongs back-up tongs 5 ​​are not slipping, that is, they are working normally;

[0040] When the main hydraulic clamp 4 drives the hydraulic clamp backup clamp 5 to rotate through the hydraulic clamp rear guide rod 301 until the hydraulic clamp rear guide rod and the rear guide rod seat are against each other, the hydraulic clamp rear guide rod 301 will be restricted from rotating by the guide rod limit seat 3. At this time, the pressure difference between the oil inlet and return ports of the make-up or make-out hydraulic motor 401 increases. Since the hydraulic clamp rear guide rod 301 is restricted from rotating by the guide rod limit seat 3, the hydraulic clamp rear guide rod 301 is applied to the guide rod limit seat 3. The first force sensor 302 and the second force sensor 303 are not subjected to the force from the hydraulic clamp rear guide rod 301, and the measured data is 0.

[0041] By comparing the pressure difference of the pressure transmitter 402 of the hydraulic motor 401 and the deviation of the curve data of the first force sensor 302 and the second force sensor 303, it is determined that the hydraulic tongs are in a slipping state of the hydraulic tongs back tongs 5, that is, an alarm is issued to shut down.

[0042] The present invention also provides a control method for clamping a slip protection device of an automatic hydraulic clamp for intelligent well repairing operation in an oil field, comprising the following steps:

[0043] S1, first, make-up or make-off is started, and the oil inlet and return pressure difference of the hydraulic motor 401 is measured by the pressure transmitter 402, and converted into the make-up and make-off torque according to the pressure difference torque relationship diagram;

[0044] S2, at this time, the first force sensor 302 and the second force sensor 303 installed on the back-up clamp tailstock 501 detect the force generated during the make-up and make-down process, and the make-up and make-down torque is obtained by multiplying the force and the lever arm. The torque curve converted by the pressure transmitter 402 and the torque curve of the force multiplied by the lever arm measured by the first force sensor 302 and the second force sensor 303 are in a synchronous increase and decrease relationship;

[0045] S3. When the torque curve calculated by the pressure transmitter 402 has the same trend as the torque curve of the force multiplied by the force arm measured by the first force sensor 302 and the second force sensor 303 and the torque data fluctuates between 0 and 25 kN·m, it is determined that the hydraulic tongs back-up tongs 5 ​​are not slipping, that is, they are working normally;

[0046] S4, when the main hydraulic tongs 4 drives the hydraulic tongs back-up tongs 5 ​​to rotate through the hydraulic tongs rear guide rod 301 until the hydraulic tongs rear guide rod and the rear guide rod seat are against each other, the hydraulic tongs rear guide rod 301 will be restricted from rotating by the guide rod limit seat 3, at this time, the pressure difference between the oil inlet and return ports of the make-up or make-out hydraulic motor 401 increases, because the hydraulic tongs rear guide rod 301 is restricted from rotating by the guide rod limit seat 3, the hydraulic tongs rear guide rod 301 is applied to the guide rod limit seat 3, the first force sensor 302 and the second force sensor 303 are not subjected to the force from the hydraulic tongs rear guide rod 301, and the measured data is 0;

[0047] S5. By comparing the pressure difference of the pressure transmitter 402 of the hydraulic motor 401 and the deviation of the curve data of the first force sensor 302 and the second force sensor 303, it is determined that the hydraulic pliers are in a state where the hydraulic pliers back-up pliers 5 slip, that is, an alarm is issued to shut down.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic hydraulic clamping and slipping protection device for intelligent well repairing in oil fields, comprising a frame (1) and a protection component (2) mounted on a surface of one end of the frame (1), characterized in that: A guide rod limit seat (3) is fixedly mounted on the side of the frame (1); the protection assembly (2) comprises a hydraulic pliers main tong (4) and a hydraulic pliers backup tong (5); a hydraulic motor (401) is arranged on the side of the hydraulic pliers main tong (4); a pressure transmitter (402) is mounted on the surface of the hydraulic motor (401); a rear guide rod seat (403) is fixedly mounted on the tail of the hydraulic pliers main tong (4); a backup tong tail seat (501) is fixedly mounted on one end of the hydraulic pliers backup tong (5); a first force sensor (302) and a second force sensor (303) are mounted inside the backup tong tail seat (501); the pressure transmitter (402) measures the oil inlet and return pressure difference of the hydraulic motor (401); and the first force sensor (302) and the second force sensor (303) detect the force generated during the make-up and break-out process; By detecting the torque curve converted by the pressure transmitter and the torque curve trend of the force multiplied by the force arm measured by the first force sensor and the second force sensor, it is determined whether the hydraulic pliers back-up tongs are working normally. By comparing the pressure difference of the pressure transmitter of the hydraulic motor and the deviation of the curve data of the first force sensor and the second force sensor, it is determined whether the hydraulic pliers back-up tongs are in a slipping state.

2. The automatic hydraulic clamping and slipping protection device for intelligent well repairing in oil fields according to claim 1 is characterized in that: The main hydraulic pliers (4) are located above the backup hydraulic pliers (5).

3. The automatic hydraulic clamping and slipping protection device for intelligent well repairing in oil fields according to claim 1 is characterized in that: The pressure transmitter (402) is connected to and communicates with the oil inlet and outlet of the hydraulic motor (401).

4. The automatic hydraulic clamping and slipping protection device for intelligent well repairing in oil fields according to claim 1 is characterized in that: A hydraulic clamp rear guide rod (301) is provided on the surface of the guide rod limiting seat (3).

5. The automatic hydraulic clamping and slipping protection device for intelligent well repairing in oil fields according to claim 4 is characterized in that: The bottom end of the hydraulic clamp rear guide rod (301) passes through the interior of the back clamp tail seat (501), and the middle end of the hydraulic clamp rear guide rod (301) passes through the interior of the rear guide rod seat (403).

6. The automatic hydraulic clamping and slipping protection device for intelligent well repairing in oil fields according to claim 5 is characterized in that: The hydraulic clamp rear guide rod (301) is rotatably connected to the guide rod limiting seat (3), the back clamp tail seat (501), and the rear guide rod seat (403).

7. The automatic hydraulic clamping and slip protection device for intelligent well repairing in oil fields according to claim 1 is characterized in that: An end cover (502) is provided inside the back clamp tailstock (501).

8. The automatic hydraulic clamping and slipping protection device for intelligent well repairing in oil fields according to claim 7 is characterized in that: There are two groups of end covers (502), and the two groups of end covers (502) are symmetrically distributed on both sides inside the back clamp tailstock (501).

9. The automatic hydraulic clamping and slipping protection device for intelligent well repairing in oil fields according to claim 7 is characterized in that: The first force sensor (302) and the second force sensor (303) are respectively fixed to the surfaces of the two sets of end covers (502).

10. A control method for clamping a slip protection device using automatic hydraulic pliers for intelligent well repairing in oil fields according to any one of claims 1 to 9, comprising the following steps: S1, first, the make-up or make-up undocking is started, and the oil inlet and return pressure difference of the hydraulic motor (401) is measured by the pressure transmitter (402), and converted into the make-up and make-up torque according to the pressure difference torque relationship diagram; S2, at this time, the first force sensor (302) and the second force sensor (303) installed on the back-up clamp tailstock (501) detect the force generated during the make-up and make-down process, and the make-up and make-down torque is obtained by multiplying the force and the lever arm. The torque curve converted by the pressure transmitter (402) and the torque curve of the force multiplied by the lever arm measured by the first force sensor (302) and the second force sensor (303) are in a synchronous increase and decrease relationship; S3. When the torque curve converted by the pressure transmitter (402) has the same trend as the torque curve of the force multiplied by the force arm measured by the first force sensor (302) and the second force sensor (303), and the torque data fluctuates between 0 and 25 kN·m, it is determined that the hydraulic pliers back-up tongs (5) are not slipping, that is, they are working normally; S4, when the main hydraulic tongs (4) drives the hydraulic tongs back-up tongs (5) to rotate through the hydraulic tongs rear guide rod (301) until the hydraulic tongs rear guide rod and the rear guide rod seat are in contact, the hydraulic tongs rear guide rod (301) will be restricted from rotating by the rear guide rod seat (403), and at this time, the pressure difference between the oil inlet and return ports of the make-up or make-out hydraulic motor (401) increases. Since the hydraulic tongs rear guide rod (301) is restricted from rotating by the rear guide rod seat (403), the hydraulic tongs rear guide rod (301) is applied to the rear guide rod seat (403), and the first force sensor (302) and the second force sensor (303) are not subjected to the force from the hydraulic tongs rear guide rod (301), and the measured data is 0; S5. By comparing the pressure difference of the pressure transmitter (402) of the hydraulic motor (401) and the curve data deviation of the first force sensor (302) and the second force sensor (303), it is determined that the hydraulic pliers are in a hydraulic pliers back pliers (5) slipping state, that is, an alarm is issued to stop the machine.

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