A new coiled tubing shearing device

Abstract

This utility model relates to a novel continuous tubing shearing device. The lower end of the upper connector is threadedly connected to a conversion connector. An outer slip assembly, a hydraulic cylinder, and an intermediate cylinder are sequentially fitted onto the outer side of the lower end of the conversion connector. The inner side of the lower end of the intermediate cylinder is threadedly fixedly connected to the outer side of the upper end of the intermediate connector. The outer side of the lower end of the intermediate connector is threadedly fixedly connected to the inner side of the upper end of the stator outer cylinder. A screw motor is installed inside the stator outer cylinder. The lower part of the screw motor is threadedly connected to a sealing cylinder via an adapter sleeve. A cutting blade assembly is fixedly installed at the lower end of the sealing cylinder. In this utility model, adjacent outer slips in the outer slip assembly are hinged together, which, in conjunction with the hydraulic cylinder, can stably clamp the tubing. The cutting blade assembly adopts a design with multiple circumferentially distributed cutting blades, powered by the screw motor to complete the cutting operation. This device improves fixing reliability, avoids decreased cutting accuracy and safety accidents, and is easy to operate and highly efficient, suitable for cutting small-diameter tubing.

Description

Technical Field

[0001] This utility model belongs to the field of downhole operation technology, specifically relating to a novel coiled tubing shearing device. Background Technology

[0002] In well workover operations, when downhole tubing is damaged, deformed, or stuck, and conventional methods are ineffective, tubing cutting equipment is needed to cut the faulty section, creating conditions for subsequent operations. Therefore, this equipment is crucial for ensuring workover efficiency. In recent years, coiled tubing workover technology has been widely used due to its ability to reduce workload and simplify procedures, and small-diameter tubing (below 80mm) is also widely used due to its low cost and high pressure resistance. However, existing cutting tools and technologies lack adaptability, stability, and efficiency for these small-diameter tubings, making it difficult to meet the needs of coiled tubing workover operations. Therefore, the development of suitable tools and processes has become an urgent need.

[0003] Existing coiled tubing shearing devices have significant drawbacks: First, the reliability of the device's fixation to the tubing during cutting is insufficient, and vibration or displacement can easily affect the cutting accuracy or even cause safety accidents. Second, the complex structure of the device leads to cumbersome operation, requiring multiple raising and lowering of the tubing string to adjust its position, resulting in low work efficiency. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned deficiencies in the existing technology by providing a novel continuous tubing shearing device, thereby solving the technical problems of insufficient reliability in fixing the tubing during cutting and cumbersome operation due to the complex structure of the device.

[0005] Its technical solution is:

[0006] A novel coiled tubing shearing device includes a working tubing, an upper connector, a conversion connector, an external slip assembly, a hydraulic cylinder, an intermediate cylinder, a plug, an intermediate connector, a stator outer cylinder, a screw motor, an adapter sleeve, a sealing cylinder, a central shaft, a cutter assembly, and a guide shoe. The working tubing is fixedly installed inside the upper connector. The lower end of the upper connector is threadedly connected to the conversion connector. The lower outer side of the conversion connector is sequentially fitted with the external slip assembly, the hydraulic cylinder, and the intermediate cylinder. The middle part of the intermediate cylinder is threadedly connected to the conversion connector. The interior of the conversion connector is a through hole. The plug is fixed inside the through hole at the lower end of the conversion connector by a shearing pin. The lower inner side of the intermediate cylinder is fixedly connected to the upper outer side of the intermediate joint by a thread. The lower outer side of the intermediate joint is fixedly connected to the upper inner side of the stator outer cylinder by a thread. A step is provided in the middle of the inner side of the stator outer cylinder. A screw motor is installed inside the stator outer cylinder on the upper side of the step. The upper part of the screw motor is connected to the intermediate joint. The lower part of the screw motor passes through the step and is threadedly connected to the sealing cylinder through an adapter sleeve. A central shaft is movably installed inside the sealing cylinder. A spring is sleeved on the outer side of the middle section of the central shaft. A cutter assembly is fixedly installed at the lower end of the sealing cylinder. A guide shoe is provided on the lower side of the cutter assembly.

[0007] Preferably, the outer clamp assembly includes five outer clamps. The outer clamps have axially distributed anti-slip teeth on their outer sides. The upper end of the inner side of the outer clamp is a conical surface, the lower end is a cylindrical surface, and the side is a flat surface. One lug is provided in the middle of one side of the outer clamp, and two lugs are provided in the middle of the other side. Adjacent outer clamps are hinged together by a pin passing through the lugs.

[0008] Preferably, the cutter assembly includes a lower cylinder and a cutter. The lower cylinder is a hollow cylindrical structure, and multiple cutter grooves are evenly distributed circumferentially in the middle of the lower cylinder. A fixing seat is fixedly provided on the inner side of the cutter groove, and the cutter is movably connected to the inner side of the fixing seat through a pin.

[0009] Preferably, the adapter sleeve includes a shaft body and an annular key. The annular key is fixedly provided at the upper end of the shaft body, and the outer side of the shaft body is provided with external threads. The annular key is connected to the lower end shaft of the screw motor via a key.

[0010] Preferably, the upper connector has a first sealing ring inside, and four first pin holes are evenly distributed on the lower outer circumference of the upper connector. The working oil pipe is fixedly connected to the upper connector by passing through the first pin holes with a fixing pin.

[0011] Preferably, the adapter is a hollow cylindrical structure with unequal diameters. The outer middle part of the adapter has a conical surface, the lower small-diameter cylinder of the adapter has a first vent hole, and the lower part of the lower small-diameter cylinder of the adapter has a second pin hole. The plug is fixedly connected to the adapter by a shear pin passing through the second pin hole.

[0012] Preferably, the hydraulic cylinder is a hollow cylinder body at the bottom, sleeved on the outer side of the small-diameter cylinder body below the conversion joint. The hydraulic cylinder is located inside the intermediate cylinder, and the upper part of the inner side of the intermediate cylinder is provided with multiple second sealing grooves. A second sealing ring is provided between the hydraulic cylinder and the intermediate cylinder.

[0013] Preferably, the intermediate connector is a cylindrical structure with an internal cavity at the upper end. The outer side of the intermediate connector is provided with a boss. A first through hole is opened at the center of the bottom of the intermediate connector for the upper shaft of the screw motor to pass through. The upper shaft is limited by a nut to prevent it from falling off. Several first liquid passage holes for liquid flow are also opened around the first through hole.

[0014] Preferably, a second liquid passage hole is provided on the step inside the stator outer cylinder, and a third liquid passage hole is provided on the upper part of the sealing cylinder.

[0015] The beneficial effects of this utility model are:

[0016] The new coiled tubing shearing device employing the above-mentioned technical solution significantly improves the reliability of its fixation. In the external slip assembly, the outer slips have axial anti-slip teeth on their outer side and a conical surface at the upper inner end. Adjacent external slips are hinged together via pins and lugs. Combined with the hydraulic cylinder, this provides stable clamping of the tubing, effectively preventing a decrease in cutting accuracy due to vibration or displacement during cutting, reducing the risk of safety accidents, and offering simple operation and high efficiency. The various components of the device are connected by threads, resulting in a rational structural design that eliminates the need for repeated tubing string adjustments. The cutter assembly features multiple circumferentially distributed cutters, which, combined with the power provided by the screw motor, efficiently complete the cutting operation, greatly improving well workover efficiency. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the coiled tubing shearing device of this utility model;

[0018] Figure 2 This is a perspective view of the external locking component of this utility model;

[0019] Figure 3 This is a perspective view of the adapter sleeve of this utility model;

[0020] Figure 4 This is a perspective view of the cutting blade assembly of this utility model;

[0021] In the diagram: 1. Working oil pipe; 2. Upper connector; 3. Adapter connector; 4. External slip assembly; 5. Hydraulic cylinder; 6. Intermediate cylinder; 7. Plug; 8. Intermediate connector; 9. Stator outer cylinder; 10. Screw motor; 11. Adapter sleeve; 12. Sealing cylinder; 13. Central shaft; 14. Cutter assembly; 15. Guide shoe; 16. First sealing ring; 17. Fixing pin; 18. Second sealing ring; 19. First through hole; 20. Shearing pin; 21. Third fluid passage hole; 22. Spring; 23. Damaged oil pipe; 24. Sleeve; 41. External slip; 42. Pin; 43. Shaft lug; 111. Shaft body; 112. Annular key; 141. Lower cylinder; 142. Fixing seat; 143. Cutter; 144. Cutter groove. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] like Figures 1 to 4 As shown, a continuous tubing shearing device includes a working tubing 1, an upper connector 2, a conversion connector 3, an external slip assembly 4, a hydraulic cylinder 5, an intermediate cylinder 6, a plug 7, an intermediate connector 8, a stator outer cylinder 9, a screw motor 10, an adapter sleeve 11, a sealing cylinder 12, a central shaft 13, a cutter assembly 14, and a guide shoe 15. The working tubing 1 is fixedly installed inside the upper connector 2. The lower end of the upper connector 2 is threadedly connected to the conversion connector 3. The outer slip assembly 4, the hydraulic cylinder 5, and the intermediate cylinder 6 are sequentially fitted onto the outer side of the lower end of the conversion connector 3. The middle part of the intermediate cylinder 6 is threadedly connected to the conversion connector 3. The interior of the conversion connector 3 is a through hole. The plug 7 is fixed to the through hole at the lower end of the conversion connector 3 by a shearing pin 20. Inside, the lower inner side of the intermediate cylinder 6 is fixedly connected to the upper outer side of the intermediate connector 8 by a thread. The lower outer side of the intermediate connector 8 is fixedly connected to the upper inner side of the stator outer cylinder 9 by a thread. A step is provided in the middle of the inner side of the stator outer cylinder 9. A screw motor 10 is provided inside the stator outer cylinder 9 on the upper side of the step. The upper part of the screw motor 10 is connected to the intermediate connector 8. The lower part of the screw motor 10 passes through the step and is threadedly connected to the sealing cylinder 12 through the adapter sleeve 11. A central shaft 13 is movably provided inside the sealing cylinder 12. A spring 22 is sleeved on the outer side of the middle section of the central shaft 13. A cutter assembly 14 is fixedly installed at the lower end of the sealing cylinder 12. A guide shoe 15 is provided on the lower side of the cutter assembly 14.

[0024] The aforementioned outer slip assembly 4 includes five outer slips 41. The outer slips 41 have axially distributed anti-slip teeth on their outer sides. The upper end of the inner side of the outer slip 41 is a conical surface, the lower end is a cylindrical surface, and the side is a flat surface. One lug 43 is provided in the middle of one side of the outer slip 41, and two lugs 43 are provided in the middle of the other side. Adjacent outer slips 41 are connected by a hinge through a pin 42 passing through the lugs 43.

[0025] The aforementioned cutter assembly 14 includes a lower cylinder 141 and cutters 143. The lower cylinder 141 is a hollow cylindrical structure. Multiple cutter grooves 144 are evenly distributed around the center of the lower cylinder 141. A fixing seat 142 is fixedly provided on the inner side of the cutter groove 144. The cutters 143 are movably connected to the inner side of the fixing seat 142 through a pin. The number of cutters 143 is 3.

[0026] The aforementioned adapter sleeve 11 includes a shaft body 111 and an annular key 112. The annular key 112 is fixedly provided at the upper end of the shaft body 111, and the outer side of the shaft body 111 is provided with an external thread. The annular key 112 is connected to the lower end shaft of the screw motor 10 via a key.

[0027] The upper connector 2 is provided with a first sealing ring 16 inside. Four first pin holes are evenly distributed on the lower outer circumference of the upper connector 2. The working oil pipe 1 is fixedly connected to the upper connector 2 through the first pin holes by a fixing pin 17.

[0028] The aforementioned adapter 3 is a hollow cylindrical structure with unequal diameters. The outer middle part of the adapter 3 has a conical surface. The lower small-diameter cylinder of the adapter 3 has a first vent hole 19 in the middle part. The lower part of the lower small-diameter cylinder of the adapter 3 has a second pin hole. The plug 7 is fixedly connected to the adapter 3 by passing a shear pin 20 through the second pin hole.

[0029] The hydraulic cylinder 5 is a hollow cylinder body at the bottom, which is sleeved on the outer side of the small-diameter cylinder body under the conversion joint 3. The hydraulic cylinder 5 is located inside the intermediate cylinder 6. The upper part of the inner side of the intermediate cylinder 6 is provided with multiple second sealing grooves. A second sealing ring 18 is provided between the hydraulic cylinder 5 and the intermediate cylinder 6.

[0030] The aforementioned intermediate connector 8 is a cylindrical structure with an internal cavity at the upper end. The outer side of the intermediate connector 8 is provided with a boss. A first through hole is opened at the bottom center of the intermediate connector 8 for the upper shaft of the screw motor 10 to pass through. The upper shaft is limited by a nut to prevent it from falling off. Several first liquid passage holes for liquid flow are also opened around the first through hole.

[0031] A second liquid passage hole is provided on the step inside the stator outer cylinder 9, and a third liquid passage hole 21 is provided on the upper part of the sealing cylinder 12.

[0032] The working process of this utility model:

[0033] Before going down into the well, the working tubing 1 is fixed to the upper connector 2 using multiple fixing pins 17. Then, by lowering the working tubing 1, the shearing device is lowered into the damaged tubing 23 to be cut and reaches the designed position. The upper end of the working tubing 1 is connected to the surface hydraulic pump, the hydraulic pump is started, and aqueous solution is pumped into the working tubing 1. The pump pressure is controlled to allow the pressurized liquid to pass through the first vent 19 of the conversion connector 3. The liquid enters the cavity of the hydraulic cylinder 5; the pump pressure pushes the hydraulic cylinder 5 upward, which in turn pushes the outer slip 41 in the outer slip assembly 4 upward along the outer conical surface of the conversion joint 3, causing the outer slip 41 to open outward and press against the inner wall of the outer sleeve 24. The pump pressure continues to increase to cut off the shearing pin 20 connecting the plug 7 and the conversion joint 3. The plug 7 falls down, and the pressurized liquid enters the stator outer cylinder 9 through several first liquid passage holes at the bottom of the intermediate joint 8, driving the screw motor 10 to rotate. Subsequently, the pressurized liquid enters the cavity at the lower end of the stator outer cylinder 9 through the second liquid passage hole, and enters the upper end face of the central shaft 13 through the third liquid passage hole 21 at the upper part of the sealing cylinder 12. The pump pressure pushes the central shaft 13 downward, causing the cutter 143 to open outward and press against the inner side of the damaged oil pipe 23. The pump pressure is further increased, and the screw motor 10 drives the cutter 143 to rotate, thereby cutting off the damaged oil pipe 23.

[0034] The above description is merely a preferred embodiment of this utility model. Any person skilled in the art may modify this utility model or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of this utility model are within the scope of protection claimed by this utility model.

Claims

1. A novel coiled tubing shearing device, characterized in that: The system includes a working oil pipe (1), an upper connector (2), a conversion connector (3), an outer slip assembly (4), a hydraulic cylinder (5), an intermediate cylinder (6), a plug (7), an intermediate connector (8), a stator outer cylinder (9), a screw motor (10), an adapter sleeve (11), a sealing cylinder (12), a central shaft (13), a cutter assembly (14), and a guide shoe (15). The working oil pipe (1) is fixedly installed inside the upper connector (2). The lower end of the upper connector (2) is connected to the conversion connector (3) by a thread. The outer slip assembly (4), the hydraulic cylinder (5), and the intermediate cylinder (6) are sequentially fitted on the outer side of the lower end of the conversion connector (3). The middle part of the intermediate cylinder (6) is threadedly connected to the conversion connector (3). The interior of the conversion connector (3) is a through hole. The plug (7) is fixed to the lower end of the conversion connector (3) by a shear pin (20). Inside the through hole, the lower inner side of the intermediate cylinder (6) is fixedly connected to the upper outer side of the intermediate connector (8) by a thread. The lower outer side of the intermediate connector (8) is fixedly connected to the upper inner side of the stator outer cylinder (9) by a thread. The middle of the inner side of the stator outer cylinder (9) is provided with a step. A screw motor (10) is provided inside the stator outer cylinder (9) on the upper side of the step. The upper part of the screw motor (10) is connected to the intermediate connector (8). The lower part of the screw motor (10) passes through the step and is threadedly connected to the sealing cylinder (12) through the adapter sleeve (11). A central shaft (13) is movably provided inside the sealing cylinder (12). A spring (22) is sleeved on the outer side of the middle section of the central shaft (13). A cutter assembly (14) is fixedly installed at the lower end of the sealing cylinder (12). A guide shoe (15) is provided on the lower side of the cutter assembly (14).

2. The novel coiled tubing shearing device according to claim 1, characterized in that: The outer slip assembly (4) includes an outer slip (41), and the number of the outer slips (41) is 5. The outer slips (41) are provided with axially distributed anti-slip teeth on the outer side. The upper end of the inner side of the outer slip (41) is a conical surface, the lower end is a cylindrical surface, and the side is a plane. One lug (43) is provided in the middle of one side of the outer slip (41), and two lugs (43) are provided in the middle of the other side. Adjacent outer slips (41) are connected by a hinge through the lugs (43) via a pin (42).

3. The novel coiled tubing shearing device according to claim 1, characterized in that: The cutter assembly (14) includes a lower cylinder (141) and a cutter (143). The lower cylinder (141) is a hollow cylindrical structure. Multiple cutter grooves (144) are evenly distributed around the middle of the lower cylinder (141). A fixing seat (142) is fixedly provided on the inner side of the cutter groove (144). The cutter (143) is movably connected to the inner side of the fixing seat (142) through a pin.

4. The novel coiled tubing shearing device according to claim 1, characterized in that: The adapter sleeve (11) includes a shaft body (111) and an annular key (112). The annular key (112) is fixedly provided at the upper end of the shaft body (111). The outer side of the shaft body (111) is provided with an external thread. The annular key (112) is connected to the lower end shaft of the screw motor (10) by a key.

5. A novel coiled tubing shearing device according to claim 1, characterized in that: The upper connector (2) is provided with a first sealing ring (16) inside. Four first pin holes are evenly distributed on the lower outer circumference of the upper connector (2). The working oil pipe (1) is fixedly connected to the upper connector (2) through the first pin holes by a fixing pin (17).

6. A novel coiled tubing shearing device according to claim 1, characterized in that: The adapter (3) is a hollow cylindrical structure with unequal diameters. The outer middle part of the adapter (3) is provided with a conical surface. The lower small-diameter cylinder of the adapter (3) is provided with a first vent hole (19). The lower part of the lower small-diameter cylinder of the adapter (3) is provided with a second pin hole. The plug (7) is fixedly connected to the adapter (3) by passing through the second pin hole with a shear pin (20).

7. A novel coiled tubing shearing device according to claim 1, characterized in that: The hydraulic cylinder (5) is a hollow cylinder body at the bottom, which is sleeved on the outer side of the small-diameter cylinder body under the conversion joint (3). The hydraulic cylinder (5) is located inside the intermediate cylinder (6). The upper part of the inner side of the intermediate cylinder (6) is provided with multiple second sealing grooves. A second sealing ring (18) is provided between the hydraulic cylinder (5) and the intermediate cylinder (6).

8. A novel coiled tubing shearing device according to claim 1, characterized in that: The intermediate connector (8) is a cylindrical structure with an internal cavity at the upper end. The intermediate connector (8) has a boss on its outer side. The bottom center of the intermediate connector (8) has a first through hole through which the upper shaft of the screw motor (10) passes. The upper shaft is limited by a nut to prevent it from falling off. Several first liquid passage holes for liquid flow are also provided around the first through hole.

9. A novel coiled tubing shearing device according to claim 1, characterized in that: A second liquid passage hole is provided on the step inside the stator outer cylinder (9), and a third liquid passage hole (21) is provided on the upper part of the sealing cylinder (12).

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