Automatic cutting device for coiled tubing

Abstract

The utility model discloses an automatic coiled tubing cutting device which comprises a gear device, a motor, a fixing device, a footage plate, a cutting knife, a connecting rod and an anti-falling device, and is characterized in that the gear device consists of a driving gear and a driven gear; the motor is connected with the driving gear and drives the driving gear to rotate, and the driving gear drives the driven gear to rotate. The motor and the driven gear are fixed through a fixing device, and the fixing device is fixed to the coiled tubing. The cutting knife is connected with the driven gear through the connecting rod, and the driven gear rotates to drive the cutting knife to rotate as well. The anti-falling device is fixed on the coiled tubing; and the footage plate is arranged on the fixing device. By using the automatic cutting device for the continuous oil pipe, a cutting operator can be far away from the device and start the motor driving device to operate, the continuous oil pipe cannot fly around in a large range at the moment when the continuous oil pipe is cut, the operation is simple, and the safety of the cutting operator is well ensured.

Description

Technical Field

[0001] This utility model belongs to the field of petroleum and other energy operations, and specifically relates to a device for cutting coiled tubing, particularly an automatic coiled tubing cutting device. Background Technology

[0002] Coiled tubing is a type of tubing made of low-carbon alloy steel, possessing excellent flexibility and also known as flexible tubing. A single roll of coiled tubing can be several kilometers long. Due to its flexibility and length, coiled tubing has a very high yield strength. If cut from the middle or even at a point several meters in, the yield strength is released instantaneously at the point of near-breakage, generating a large amount of uncontrolled breakage force. Consequently, the broken end of the coiled tubing will appear to snap, causing the two sections to fly off haphazardly. The larger the outer diameter of the coiled tubing and the farther the cut point is from the end, the greater the uncontrolled breakage force generated by the yield strength.

[0003] Currently, coiled tubing cutting is primarily a manual operation, with workers holding a rotary cutter and rotating it back and forth to cut the coiled tubing. Due to the flexible nature of coiled tubing, the chaotic force generated when it is about to be cut can strike any unpredictable part of the worker's body, and the cutter may also fly off. Even if the coiled tubing is fixed at both ends at the cutting point, the resulting force can still cause significant shock to the worker's arm, leading to the cutter slipping from their hand. Therefore, there is a significant safety hazard.

[0004] To address the aforementioned problems, this invention provides an automatic coiled tubing cutting device. Once fixed to the coiled tubing, the operator only needs to remotely start the motor, which drives the cutting device to automatically cut the coiled tubing. After the coiled tubing is cut, an anti-detachment device ensures that the cut tubing only oscillates slightly, preventing it from flying around erratically. This cutting device is simple and reliable to operate, and effectively ensures the safety of the cutting personnel. Utility Model Content

[0005] This invention provides an automatic cutting device for cutting continuous tubing.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] An automatic cutting device for coiled tubing includes a gear assembly, a motor, a fixing device, a feed plate, a cutter, a connecting rod, and an anti-detachment device. The gear assembly consists of a driving gear and a driven gear; the motor is connected to the driving gear, driving it to rotate, and the driving gear drives the driven gear to rotate; the motor and driven gear are fixed to the coiled tubing via the fixing device; the cutter is connected to the driven gear via the connecting rod, and the rotation of the driven gear drives the cutter to rotate as well; the anti-detachment device is fixed to the coiled tubing; and the feed plate is mounted on the fixing device.

[0008] The gear assembly can be a parallel gear, a worm gear, or a bevel gear.

[0009] The drive gear has a screw hole for connecting to the motor.

[0010] The driven gear is a two-lobed type. Since the coiled tubing is a single, several-kilometer-long tubing, one end is fixed inside a drum, while the other end is inside the well during operation. Normally, when cutting the coiled tubing, the other end is also inside another drum, making it generally impossible to insert from one end for cutting. Using a two-lobed driven gear, the two lobes are positioned opposite each other in the gear groove of the fixing device, and the two lobes are then joined together by fixing screws to form a single unit. The driven gear has threaded holes for connecting the connecting rod.

[0011] The motor is a power-providing device and can be a hydraulic motor or an electric motor. The motor is connected to the drive gear and drives the drive gear to rotate.

[0012] The fixing device consists of a cylindrical body and two vertical plates. One vertical plate is located at the end of the fixing device used to fix the motor, and is perpendicular to the cylindrical body for fixing the motor. The other vertical plate is located on the same circumference at a 90° angle to the first vertical plate, for fixing the feed plate. The two vertical plates are identical in shape, either fan-shaped or square, and have screw holes. A groove is provided at the end of the fixing device opposite to the end used to fix the motor, and the driven gear is placed in this groove. The fixing device can be a single piece or a two-part type. A single-piece fixing device can be directly inserted from one end of the oil pipe; when it cannot be inserted from one end of the continuous oil pipe, a two-part fixing device is used, with the two parts placed opposite each other on the oil pipe and joined together by fixing screws to form a single unit.

[0013] The feed plate is rectangular, and its width dimension is greater than the feed distance. The feed plate is fixed by a vertical plate at one end of the fixing device. The feed plate is used to rotate the cutter and advance it, thereby allowing the blade to bite and cut the continuous tubing.

[0014] The cutter is used for cutting oil pipes. The cutter holder has a screw hole in the middle, and the handle has a lead screw and evenly distributed planetary gear-shaped rods (called planetary gear rods). The lead screw is connected through a threaded hole in the middle of the cutter holder. The planetary gear rods have a circular outer diameter formed with the handle as the center, and there are at least four planetary gear rods, typically four to six, for example, four, five, or six. The cutter holder has a screw hole on its outward side for connection to a connecting rod. The cutter is connected to the driven gear via the connecting rod.

[0015] The anti-detachment device consists of two fixing clips and a lever hoist, with the two fixing clips connected together by the lever hoist. The fixing clips are fixed to the continuous hydraulic hose, located on one side of the fixing device and the other side of the cutter. The height formed by the suspended section of the lever hoist and the hydraulic hose must not affect the cutting operation of the motor, gear mechanism, and cutter. If the lever hoist is too short, it will become entangled in the operating equipment. After the continuous hydraulic hose is cut, slowly release the lever hoist to separate the two sections of the continuous hydraulic hose.

[0016] The connecting rod is a straight rod or a Z-shaped rod with screws at both ends, connecting the cutter and the driven gear.

[0017] According to this invention, after the self-cutting device is fixed to the coiled tubing, the cutting operator can move away and then start the motor. The motor drives the gear mechanism to operate the cutting device until the coiled tubing is cut. At the moment the coiled tubing is cut, the anti-detachment device prevents the two sections of tubing from flying off in a large area. After cutting, the motor can be turned off. The operation is simple and reliable, and it better ensures the personal safety of the cutting operator. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall assembly structure of the automatic continuous tubing cutting device according to this utility model.

[0019] Figure 2 This is a partial assembly structure schematic diagram of the automatic continuous tubing cutting device according to this utility model from another perspective (where the driven gear is not installed).

[0020] Explanation of reference numerals in the attached figures

[0021] 1. Driving gear; 2. Driven gear; 3. Motor; 4. Fixing device; 5. Feed plate; 6. Cutting blade; 7. Planetary gear rod; 8. Fixing clip; 9. Lever hoist; 10. Connecting rod; 11. Continuous oil pipe; 12. Gear groove. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] Example 1:

[0024] An automatic cutting device for continuous tubing includes a gear assembly, a motor 3, a fixing device 4, a feed plate 5, a cutter 6, a connecting rod 10, and an anti-detachment device.

[0025] The assembly and operation process of the device of this utility model is as follows:

[0026] Device assembly: First, fix the fixing device 4 and the continuous oil pipe 11 together, then fix the driven gear 2 in the groove 12 on the fixing device 4; after connecting the driving gear 1 and the motor 3, fix the motor 3 on the fixing device 4; connect the cutter 6 and the driven gear 2 together with the connecting rod 10; then install the fixing clip 8 of the anti-detachment device and the lever hoist 9, and adjust the length of the suspended chain part of the lever hoist 9. This completes the assembly of the entire device.

[0027] Device Operation: Manually rotate the handle of the cutter 6 to make the blade grip the continuous oil pipe 11. Then, the operator moves away from the cutting device and starts the motor 3. The motor 3 drives the drive gear 1 to rotate, which in turn drives the driven gear 2 to rotate. The driven gear 2 drives the cutter 6 to rotate until the continuous oil pipe 11 is cut. Each rotation of the cutter 6 causes the planetary gear rod 7 of the cutter handle to be shifted at a certain angle by the feed plate 5. This angle ensures that when the cutter 6 rotates again, another wheel of the planetary gear rod 7 of the cutter handle is shifted by the feed plate 5. At the same time, the lead screw integrated with the planetary gear rod 7 of the cutter rotates and moves downward, ultimately causing the blade of the cutter 3 to maintain a tight grip on the continuous oil pipe 11. After the continuous oil pipe 11 is cut, turn off the motor 3 as soon as possible. Due to the anti-detachment device, the two sections of the continuous oil pipe only swing slightly. After the swinging stops, slowly release the lever 9 to lower the continuous oil pipe 11 to the ground, remove the automatic continuous oil pipe cutting device, and the cutting is complete.

Claims

1. A coiled tubing automatic cutting device, comprising: The invention relates to a gear device, a motor (3), a fixing device (4), a footage plate (5), a cutting knife (6), a connecting rod (10) and an anti-slip device, wherein the gear device is composed of a driving gear (1) and a driven gear (2); the motor (3) is connected to the driving gear (1) to drive the driving gear (1) to rotate, and the driving gear (1) drives the driven gear (2) to rotate; the driven gear (2) and the motor (3) are fixed by a fixing device (4), and the fixing device (4) is fixed on a coiled tubing (11); the cutting knife (6) is connected to the driven gear (2) by a connecting rod (10), and the rotation of the driven gear (2) drives the cutting knife (6) to rotate as well; the anti-slip device is fixed on the coiled tubing (11); the footage plate (5) is arranged on the fixing device (4).

2. The automatic coiled tubing cutting device according to claim 1 is characterized in that: The fixing device (4) is of integral type or two-piece type; the integral type fixing device is directly inserted into one end of the oil pipe, and the two pieces of the two-piece type fixing device are placed opposite to each other on the oil pipe, and the two pieces are combined to form a whole.

3. The automatic coiled tubing cutting device according to claim 1 or 2, characterized in that: The fixing device (4) is composed of a cylindrical body and two vertical plates, one of which is arranged at one end of the fixing device (4) for fixing the motor (3), the vertical plate is perpendicular to the cylindrical body, and another vertical plate is arranged on the same circumference at 90 degrees as the vertical plate; a gear groove (12) is arranged at the other end of the fixing device (4) opposite to the end of the fixing device (4) for fixing the motor (3), and the driven gear (2) is placed in the groove.

4. The automatic coiled tubing cutting device according to claim 3 is characterized in that: The vertical plate is fan-shaped or square, and is provided with screw holes.

5. The automatic coiled tubing cutting device according to claim 1 is characterized in that: The driven gear (2) is of a two-lobed type, wherein the two lobes of the two-lobed driven gear are oppositely placed in the gear groove (12) of the fixing device, and the two lobes are combined to form a whole.

6. The automatic coiled tubing cutting device according to claim 1, characterized in that: The footage plate (5) is rectangular, and its width direction is larger than the footage distance.

7. The automatic coiled tubing cutting device according to claim 1, characterized in that: The cutter (6) has a screw hole in the middle of the cutter holder, and the cutter handle has a lead screw and is provided with a planetary wheel rod (7).

8. The automatic coiled tubing cutting device according to claim 7, characterized in that: The number of the planetary gear rods (7) is at least 4, and generally 4-6.

9. The automatic coiled tubing cutting device according to claim 1, characterized in that: The anti-slip device is composed of two fixing clips (8) and a lever hoist (9); the fixing clips (8) are fixed on the coiled tubing (11), respectively located on one side of the fixing device (4) and one side of the cutting knife (6); the two fixing clips (8) are connected together through the lever hoist (9).

10. The automatic coiled tubing cutting device according to claim 1, characterized in that: The connecting rod (10) is a straight rod or a Z-shaped rod, with screws at both ends.

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