A device and method for welding a casing collar

Abstract

This invention belongs to the field of oil casing and tubing inspection technology, and specifically relates to an operating device and welding method for welding end plugs of oil casing and tubing. The device includes a base, a foot switch, and an operating table. The base has two parallel outer rails, each with a lifting mechanism movably connected to its end. Between the two outer rails are two parallel inner rails, each movably connected to an active rotation mechanism and a passive rotation mechanism. A drive shaft connects the active and passive rotation mechanisms, and a lifting motor is mounted on the drive shaft. The active rotation mechanism is electrically connected to the foot switch, and the active, passive, and lifting mechanisms are each electrically connected to the operating table. This invention, through the active, passive, and lifting mechanisms, completes the alignment and assembly of the end plug with the oil casing and tubing end, reducing the accuracy issues associated with manual alignment, avoiding deflection after welding, and saving preparation time while reducing safety risks.

Description

Technical Field

[0001] This invention belongs to the field of oil casing and tubing inspection technology, and specifically relates to an operating device and welding method for welding end plugs of oil casing and tubing. Background Technology

[0002] With the technological advancements in high-pressure wells, deep wells, and ultra-deep wells, as well as the complex operating conditions at oil well sites, higher demands are being placed on the performance of oil well tubing. API standards impose stringent requirements on threaded connection strength testing and sealing performance testing. To verify whether the thread performance of the steel tubing meets the requirements of the operating conditions, the laboratory conducts tests on the casing and tubing under combined loads (tension, compression, bending, internal pressure, external pressure, etc.) and different operating environments (water, gas, temperature rise, etc.) to simulate the complex operating conditions of oil well tubing during its downhole service.

[0003] Currently, laboratories primarily use end-plug welding to connect experimental steel pipes to equipment for testing. Automated welding equipment is suitable for welding large-diameter steel pipes under high workloads and for production lines operating for extended periods. However, considering the workload of small-diameter oil casing pipes and laboratory operations, manual arc welding is a more cost-effective method. Traditional welding methods require manual welding of the steel pipe, with one person rotating the pipe and another welding the end-plug connection. Therefore, the welding personnel and the pipe-rotating personnel often cannot achieve synchronization during the welding process, leading to issues such as weld misalignment and incomplete penetration, affecting welding quality and consequently the stability of the experimental process. Furthermore, traditional equipment cannot completely guarantee the alignment of the end-plug and the steel pipe, resulting in a certain degree of deflection at both ends of the experimental steel pipe. This deflection causes the steel pipe to bear some shear force during the experiment and is prone to instability, leading to inaccurate experimental results or even weld breakage and experimental failure. Summary of the Invention

[0004] To address the problems of welding misalignment and incomplete penetration caused by equipment malfunctions in current end plug welding, the present invention aims to provide an operating device and method for welding end plugs on oil casing pipes. This device employs an active rotation mechanism, a passive rotation mechanism, and a lifting mechanism to complete the alignment and assembly of the end plug and the end of the oil casing pipe, reducing the low accuracy of manual alignment and effectively solving the problem of deflection after welding. It reduces safety risks while saving preparation time.

[0005] The technical solution of the present invention is as follows: an operating device for welding end plugs of oil casing pipes, including a base, a foot switch, and an operating table. The base is provided with two parallel outer rails, and lifting mechanisms are movably connected to both ends of the outer rails. Two parallel inner rails are provided between the two outer rails. An active rotating mechanism is movably connected to one end of the inner rails, and a passive rotating mechanism is movably connected to the other end. A transmission shaft is provided between the active rotating mechanism and the passive rotating mechanism. A lifting motor is provided on the transmission shaft. The active rotating mechanism is electrically connected to the foot switch. The active rotating mechanism, the passive rotating mechanism, and the two sets of lifting mechanisms are respectively electrically connected to the operating table.

[0006] The active rotation mechanism includes an active rotation mechanism base, and first casters are respectively provided on both sides of the active rotation mechanism base. The first casters are movably connected to the inner track.

[0007] The active rotation mechanism base is provided with a first lifting screw in the middle, and an active rotation mechanism roller base is provided at the top of the first lifting screw. A transmission rod is provided at the top of the active rotation mechanism roller base. Two active rotation mechanism rollers are movably connected above the transmission rod. A rotary motor is provided at the drive end of the transmission rod. A first photoelectric sensor receiving device is provided on the side of the active rotation mechanism roller base away from the rotary motor.

[0008] The passive rotation mechanism includes a passive rotation mechanism base, and second casters are respectively provided on both sides of the passive rotation mechanism base. The second casters are movably connected to the inner track.

[0009] The passive rotation mechanism base is provided with a second lifting screw in the middle, and a passive rotation mechanism roller base is provided on the top of the second lifting screw. Two passive rotation mechanism rollers are movably connected to the top of the passive rotation mechanism roller base, and a second photoelectric sensor receiving device is provided on one side of the passive rotation mechanism base.

[0010] The lifting mechanism includes a lifting mechanism base, and third casters are provided on both sides of the lifting mechanism base. The third casters are movably connected to the outer track.

[0011] The lifting mechanism has an electric lead screw in the middle of its base, a motor connected to the bottom side of the electric lead screw, a lifting frame at the top of the electric lead screw, and a photoelectric limit reflector on the side of the lifting frame.

[0012] The top of the support frame is a semi-circular arc.

[0013] A method for welding end plugs of oil casing pipes, using any of the oil casing pipe end plug welding operating devices described above, includes the following steps: S1: Based on the outer diameter of the oil casing pipe end sample, start the lifting motor to drive the transmission shaft to adjust the welding height of the active rotation mechanism and the passive rotation mechanism; S2: The height of the lifting mechanism is adjusted by the motor. When the height is consistent with the height of the active rotation mechanism and the passive rotation mechanism, the operating panel controls the motor to stop working by receiving feedback signals from the photoelectric limit reflector received by the first photoelectric sensor receiving device and the second photoelectric sensor receiving device. S3: Place the end plug on the lifting frame, move the lifting mechanism to bring the bevel of the end plug close to the bevel of the oil casing pipe end sample, and spot weld the end plug to the oil casing pipe end sample to fix it. S4: Remove the lifting mechanism, and the welder uses a foot switch on site to start the rotary motor, which drives the active rotating mechanism rollers to rotate and perform welding.

[0014] The technical advantages of this invention are as follows: 1. This invention employs an active rotation mechanism, a passive rotation mechanism, and a lifting mechanism, which can accurately complete the alignment and assembly of the end plug and the steel pipe, reducing the low accuracy of manual alignment and effectively solving the problem of deflection after welding. This reduces safety risks and saves preparation time. 2. This invention controls the rotary motor via a foot switch, allowing welders to control the welding speed themselves. This solves the problem of asynchronous operation between two people in traditional welding, improving welding quality and thus enhancing the stability of the experimental process. 3. This invention can achieve welding of oil casing end plugs with different pipe diameters and wall thicknesses.

[0015] The following will provide further explanation in conjunction with the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a top view of a welding operation device for the end plug of an oil casing pipe according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the active rotation mechanism of an oil casing pipe end plug welding operation device according to an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the passive rotation mechanism of an oil casing pipe end plug welding operation device according to an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the lifting mechanism of an oil casing pipe end plug welding operation device according to an embodiment of the present invention.

[0020] Reference numerals: 1-Active rotating mechanism, 2-Passive rotating mechanism, 3-Lifting and raising mechanism, 4-Outer rail, 5-Foot switch, 6-Operating panel, 7-Base, 8-Inner rail, 9-Lifting motor, 10-Active rotating mechanism roller, 11-Active rotating mechanism roller base, 12-Transmission rod, 13-First photoelectric sensor receiving device, 14-First lifting screw, 15-First caster, 16-Active rotating mechanism base, 17-Rotating motor, 18-Passive rotating mechanism roller, 19-Passive rotating mechanism roller base, 20-Second photoelectric sensor receiving device, 21-Second lifting screw, 22-Passive rotating mechanism base, 23-Second caster, 23-Lifting frame, 24-Motor, 25-Electric screw, 26-Third caster, 27-Photoelectric limit reflector, 28-Lifting and raising mechanism base. Detailed Implementation

[0021] Example 1 like Figure 1 As shown, an operating device for welding end plugs of oil casing pipes includes a base 7, a foot switch 5, and an operating platform 6. The base 7 is provided with two parallel outer rails 4. Lifting and lifting mechanisms 3 are movably connected to both ends of the outer rails 4. Two parallel inner rails 8 are provided between the two outer rails 4. One end of the inner rail 8 is movably connected to an active rotating mechanism 1, and the other end is movably connected to a passive rotating mechanism 2. A transmission shaft 29 is provided between the active rotating mechanism 1 and the passive rotating mechanism 2. A lifting motor 9 is provided on the transmission shaft 29. The active rotating mechanism 1 is electrically connected to the foot switch 5. The active rotating mechanism 1, the passive rotating mechanism 2, and the two sets of lifting and lifting mechanisms 3 are respectively electrically connected to the operating platform 6.

[0022] In practical use, this invention starts the lifting motor 9 according to the outer diameter of the oil casing pipe end sample, driving the transmission shaft 29 to adjust the welding height of the active rotation mechanism 1 and the passive rotation mechanism 2. When the height is consistent with the height of the active rotation mechanism 1 and the passive rotation mechanism 2, the end plug is placed on the lifting mechanism 3. The lifting mechanism 3 is moved to bring the bevel of the end plug close to the bevel of the oil casing pipe end sample, and the end plug is spot welded to the oil casing pipe end sample to fix it. The lifting mechanism 3 is removed, and the welding personnel use the foot switch 5 on site to start the active rotation mechanism 1, which drives the oil casing pipe end sample to rotate and perform welding. This invention uses the active rotation mechanism 1, the passive rotation mechanism 2, and the lifting mechanism 3 to complete the alignment and assembly of the end plug and the oil casing pipe end, reducing the low accuracy of manual alignment, effectively solving the problem of deflection after welding, and saving preparation time while reducing safety risks.

[0023] Example 2 Preferably, based on Example 1, in this example, as Figure 2As shown, the active rotation mechanism includes an active rotation mechanism base 16, and first casters 15 are respectively provided on both sides of the active rotation mechanism base 16. The first casters 15 are movably connected to the inner track 8.

[0024] In actual use, the active rotation mechanism of the present invention includes an active rotation mechanism base 16, and first casters 15 are respectively provided on both sides of the active rotation mechanism base 16. The first casters 15 are movably connected to the inner track 8, which facilitates the adjustment of the active rotation mechanism base 16 on the inner track 8.

[0025] Example 3 Preferably, based on Embodiment 2, in this embodiment, the active rotation mechanism base 16 is provided with a first lifting screw 14 in the middle, the top of the first lifting screw 14 is provided with an active rotation mechanism roller base 11, the top of the active rotation mechanism roller base 11 is provided with a transmission rod 12, two active rotation mechanism rollers 10 are movably connected above the transmission rod 12, the driving end of the transmission rod 12 is provided with a rotary motor 17, and the side of the active rotation mechanism roller base 11 away from the rotary motor 17 is provided with a first photoelectric sensor receiving device 13.

[0026] In actual use, the welder of this invention uses the foot switch 5 to start the rotary motor 17 on site, which drives the transmission rod 12 to rotate the active rotating mechanism roller 10 and perform welding.

[0027] Example 4 Preferably, based on Example 1, in this example, as Figure 3 As shown, the passive rotation mechanism 2 includes a passive rotation mechanism base 22, and second casters 23 are respectively provided on both sides of the passive rotation mechanism base 22. The second casters 23 are movably connected to the inner track 8.

[0028] In actual use, the passive rotation mechanism 2 of the present invention includes a passive rotation mechanism base 22, and second casters 23 are respectively provided on both sides of the passive rotation mechanism base 22. The second casters 23 are movably connected to the inner track 8, which facilitates the adjustment of the passive rotation mechanism base 22 on the inner track 8.

[0029] Example 5 Preferably, based on embodiment 4, in this embodiment, the passive rotation mechanism base 22 is provided with a second lifting screw 21 in the middle, the top of the second lifting screw 21 is provided with a passive rotation mechanism roller base 19, the top of the passive rotation mechanism roller base 19 is movably connected with two passive rotation mechanism rollers 18, and a second photoelectric sensor receiving device 20 is provided on one side of the passive rotation mechanism base 22.

[0030] In actual use, the passive rotating mechanism roller base 19 of the present invention has two passive rotating mechanism rollers 18 movably connected to its top. When the rotating motor 17 starts and drives the transmission rod 12 to make the active rotating mechanism roller 10 rotate, the passive rotating mechanism roller 18 rotates at the same time, driving the oil casing pipe end to rotate and perform welding.

[0031] Example 6 Preferably, based on Example 4, in this example, as Figure 4 As shown, the lifting mechanism 3 includes a lifting mechanism base 28, and third casters 26 are respectively provided on both sides of the lifting mechanism base 28. The third casters 26 are movably connected to the outer track 4.

[0032] In actual use, the lifting mechanism 3 of the present invention includes a lifting mechanism base 28, and third casters 26 are respectively provided on both sides of the lifting mechanism base 28. The third casters 26 are movably connected to the outer track 4, which facilitates the adjustment of the lifting mechanism base 28 on the outer track 4.

[0033] Example 7 Preferably, based on embodiment 6, in this embodiment, the base 28 of the lifting mechanism is provided with an electric lead screw 25 in the middle, the bottom side of the electric lead screw 25 is connected to a motor 24, the top of the electric lead screw 25 is provided with a lifting frame 23, and the side of the lifting frame 23 is provided with a photoelectric limiting reflector 27.

[0034] In actual use, the height of the lifting mechanism 3 is adjusted by the motor 24. When the height is consistent with the height of the active rotating mechanism 1 and the passive rotating mechanism 2, the operating table 6 controls the motor 24 to stop working by receiving the feedback signal from the photoelectric limit reflector 27 received by the first photoelectric sensor receiving device 13 and the second photoelectric sensor receiving device 20. The adjustment is quick and accurate.

[0035] Example 8 Preferably, based on embodiment 7, in this embodiment, the top of the lifting frame 23 is semi-circular.

[0036] In actual use, the top of the lifting frame 23 of the present invention is semi-circular, which facilitates the lifting of the oil casing pipe end.

[0037] Example 9 A method for welding end plugs of oil casing pipes, using any of the oil casing pipe end plug welding operating devices described above, includes the following steps: S1: Based on the outer diameter of the oil casing pipe end sample, start the lifting motor 9 to drive the transmission shaft 29 to adjust the welding height of the active rotation mechanism 1 and the passive rotation mechanism 2. S2: The height of the lifting mechanism 3 is adjusted by the motor 24. When the height is consistent with the height of the active rotating mechanism 1 and the passive rotating mechanism 2, the operating table 6 controls the motor 24 to stop working by receiving the feedback signal of the photoelectric limit reflector 27 received by the first photoelectric sensor receiving device 13 and the second photoelectric sensor receiving device 20. S3: Place the end plug on the lifting frame 23, move the lifting mechanism 3 to bring the bevel of the end plug close to the bevel of the oil casing pipe end sample, and spot weld the end plug to the oil casing pipe end sample to fix it. S4: Remove the lifting mechanism 3, and the welder uses the foot switch 5 on site to start the rotary motor 17, which drives the active rotating mechanism roller 10 to rotate and perform welding.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for welding end plugs to oil casing pipes, characterized in that: The method for welding the end plugs of the casing pipe uses a welding operation device for the end plugs of the casing pipe. The device includes a base (7), a foot switch (5), and an operating table (6). The base (7) is provided with two parallel outer rails (4). Lifting and lifting mechanisms (3) are movably connected to both ends of the outer rails (4). Two parallel inner rails (8) are provided between the two outer rails (4). One end of the inner rail (8) is movably connected to an active rotating mechanism (1), and the other end is movably connected to a passive rotating mechanism (2). A transmission shaft (29) is provided between the active rotating mechanism (1) and the passive rotating mechanism (2). A lifting motor (9) is provided on the transmission shaft (29). The active rotating mechanism (1) is electrically connected to the foot switch (5). The active rotating mechanism (1), the passive rotating mechanism (2), and the two sets of lifting and lifting mechanisms (3) are electrically connected to the operating table (6). The method for welding the end plugs of the casing pipe includes the following steps: S1: Based on the outer diameter of the oil casing pipe end sample, start the lifting motor (9) and drive the transmission shaft (29) to adjust the welding height of the active rotation mechanism (1) and the passive rotation mechanism (2); S2: Adjust the height of the lifting mechanism (3) by the motor (24). When the height is consistent with the height of the active rotating mechanism (1) and the passive rotating mechanism (2), the operating table (6) controls the motor (24) to stop working by receiving the feedback signal of the photoelectric limit reflector (27) received by the first photoelectric sensor receiving device (13) and the second photoelectric sensor receiving device (20). S3: Place the end plug on the lifting frame (23), move the lifting mechanism (3) to bring the end plug bevel close to the bevel of the oil casing pipe end sample, and spot weld the end plug to the oil casing pipe end sample to fix it. S4: Remove the lifting mechanism (3), and the welder uses the foot switch (5) on site to start the rotary motor (17), which drives the active rotating mechanism roller (10) to rotate and perform welding.

2. The method for welding end plugs of oil casing pipes according to claim 1, characterized in that: The active rotation mechanism includes an active rotation mechanism base (16), and first casters (15) are provided on both sides of the active rotation mechanism base (16). The first casters (15) are movably connected to the inner track (8).

3. The method for welding end plugs of an oil casing pipe according to claim 2, characterized in that: The active rotation mechanism base (16) is provided with a first lifting screw (14) in the middle, and an active rotation mechanism roller base (11) is provided at the top of the first lifting screw (14). A transmission rod (12) is provided at the top of the active rotation mechanism roller base (11). Two active rotation mechanism rollers (10) are movably connected above the transmission rod (12). A rotary motor (17) is provided at the driving end of the transmission rod (12). A first photoelectric sensor receiving device (13) is provided on the side of the active rotation mechanism roller base (11) away from the rotary motor (17).

4. The method for welding end plugs of oil casing pipes according to claim 1, characterized in that: The passive rotation mechanism (2) includes a passive rotation mechanism base (22), and second casters are provided on both sides of the passive rotation mechanism base (22). The second casters are movably connected to the inner track (8).

5. The method for welding end plugs of an oil casing pipe according to claim 4, characterized in that: The passive rotation mechanism base (22) is provided with a second lifting screw (21) in the middle, and a passive rotation mechanism roller base (19) is provided on the top of the second lifting screw (21). Two passive rotation mechanism rollers (18) are movably connected to the top of the passive rotation mechanism roller base (19). A second photoelectric sensor receiving device (20) is provided on one side of the passive rotation mechanism base (22).

6. The method for welding end plugs of an oil casing pipe according to claim 1, characterized in that: The lifting mechanism (3) includes a lifting mechanism base (28), and third casters (26) are provided on both sides of the lifting mechanism base (28). The third casters (26) are movably connected to the outer track (4).

7. The method for welding end plugs of an oil casing pipe according to claim 6, characterized in that: The base (28) of the lifting mechanism is provided with an electric screw (25) in the middle. The electric screw (25) is connected to a motor (24) on the bottom side. The electric screw (25) is provided with a lifting frame (23) on the top. The lifting frame (23) is provided with a photoelectric limiting reflector (27) on the side.

8. The method for welding end plugs of oil casing pipes according to claim 7, characterized in that: The top of the support frame (23) is semi-circular.

Images