Coiled tubing shearing system

Abstract

The utility model discloses a coiled tubing shearing system which comprises a coiled tubing shearing device which is composed of a shearing assembly and a shearing driving assembly. The shearing driving assembly comprises an oil cylinder, a piston and a cylinder cover; the piston is arranged in a closed oil cavity formed by the oil cylinder and the cylinder cover, a piston rod of the piston vertically penetrates to the outer side of the oil cylinder, and hydraulic oil channels are formed in the top side of the oil cylinder and the cylinder cover respectively. The shearing assembly comprises an upper shearing plate and a lower shearing plate, the lower shearing plate is fixed at the top end of the piston rod, and the upper shearing plate is fixed above the lower shearing plate; the coiled tubing shearing device is connected with the shearing control system and comprises a three-position four-way reversing valve which is connected with the hydraulic pump station and the two hydraulic oil channels through rubber pipes; according to the coiled tubing shearing system, the cutting speed can be increased, the continuous cutting requirement can be met, hydraulic remote operation can be achieved, the safety risk of high-altitude operation is reduced, the requirement for the number of personnel is reduced, manpower and material resources are saved, and the system flexibly adapts to various construction environments and conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of blowout preventer control, in particular to a continuous tubing shearing system. Background Art

[0002] In oilfield operations, a roll of unthreaded continuous tubing can be several thousand meters long and can replace conventional tubing for a large number of construction and operations. It has the characteristics of small system, fast cycle and low cost. During the use of continuous tubing, it is often necessary to cut it to meet different operational requirements.

[0003] Traditionally, coiled tubing is cut with a cutter. The continuous friction between the cutting tool and the tubing will produce a lot of noise, which will have a great impact on the hearing of the operator. This method requires close operation, and huge stress will be generated at the moment of cutting and breaking, causing the tubing to fly and cause harm to the operator. This method requires the operator to have certain professional skills and experience to ensure the normal cutting.

[0004] In addition, when working in the oil field, the oil pipe needs to be cut continuously and for a long time. When the traditional method is used for continuous cutting, the cutter wears out and needs to be replaced many times. The workers have to work for a long time, which is inefficient. In addition, this cutting method requires multiple people to operate together, which has high requirements for the construction environment.

[0005] Based on this, there is an urgent need to develop an efficient, safe, stable and suspended continuous tubing cutting system and put it into field use, so as to ensure the cutting accuracy and speed and meet the high efficiency requirements of oilfield operations. Utility Model Content

[0006] The utility model aims to provide a continuous tubing shearing system which can solve the above technical problems.

[0007] To this end, the technical solution of the utility model is as follows:

[0008] A coiled tubing shearing system includes a coiled tubing shearer, which is composed of a shearing assembly and a shearing drive assembly; wherein:

[0009] The shear drive assembly includes an oil cylinder, a piston and a cylinder cover; the oil cylinder is a cylindrical cylinder body with a closed top and an opening at the bottom, and a piston rod penetration hole is opened at the center of the top surface, and a first hydraulic oil channel is opened on one side of the top surface; the piston is composed of a piston plate and a piston rod, the piston plate is horizontally inserted in the oil cylinder and sealed with the oil cylinder, so that the inner cavity of the oil cylinder is divided into an upper and lower oil chamber, and the piston rod is vertically fixed at the center of the top surface of the piston plate, and its upper part is penetrated from the piston rod penetration hole to the outside of the oil cylinder; the cylinder cover is sealed at the bottom opening of the oil cylinder, and a second hydraulic oil channel is opened on it;

[0010] The shearing assembly comprises an upper shearing plate, a first fixed plate, a lower shearing plate, a second fixed plate, a left fixed block, a right fixed block and two guide cylinders; the first fixed plate and the second fixed plate are two vertically arranged U-plates, which are arranged in parallel and their bottom ends are symmetrically fixed on the two side plate surfaces of the connecting boss; the left fixed block and the right fixed block are two vertically arranged strip blocks, which are symmetrically arranged and their bottom ends are respectively fixed on both sides of the top of the inner side plate surface of the second fixed plate; the upper shearing plate is fixed on the two fixed blocks with its shearing blade facing downward; the lower shearing plate is arranged directly below the two fixed blocks with its shearing blade facing upward, and its bottom end is fixed to the top of the piston rod, so that the lower shearing plate and the upper shearing plate are staggered in the horizontal direction; the two guide cylinders are vertically fixed between the first fixed plate and the second fixed plate, and a guide through groove is respectively opened on the side walls on the opposite sides of the two guide cylinders along the movement direction of the lower shearing plate, so that the lower shearing plate is lifted and lowered with the piston rod in a manner that the two sides of its plate surface are embedded in the two guide through grooves.

[0011] Furthermore, the continuous tubing cutting system also includes a shearing control system; the shearing control system includes a three-position four-way reversing valve, on which an oil inlet end, an oil return end, a first oil outlet end and a second oil outlet end are provided; wherein the oil inlet end of the three-position four-way reversing valve is connected to the oil outlet end of the hydraulic pump station through a hose to realize the pumping of the hydraulic oil; its oil return end is connected to the oil return end of the hydraulic pump station through a hose to realize the return of the hydraulic oil, and its first oil outlet end and the second oil outlet end are respectively connected to the first hydraulic oil channel and the second hydraulic oil channel of the continuous tubing cutter through a hose.

[0012] Furthermore, a trapezoidal connecting boss is vertically extended upward from the center line of the top surface of the cylinder, so that the first fixing plate and the second fixing plate are symmetrically fixed on the two side plates of the connecting boss; the piston rod through hole is opened downward in the vertical direction from the center of the top surface of the connecting boss.

[0013] Furthermore, in the piston, a double-track annular groove is provided on the circumferential side wall of the piston plate at intervals, so that a seal is formed between the piston plate and the inner wall of the oil cylinder through a double-track sealing ring provided in the double-track annular groove.

[0014] Furthermore, an inner annular step is provided on the inner wall of the bottom end of the oil cylinder, and an outer annular step matching the aforementioned inner annular step is provided on the outer wall of the top end of the cylinder cover, so that the cylinder cover is inserted into the oil cylinder in a manner that the end face of its outer annular step abuts against the end face of the inner annular step on the oil cylinder; the top end of the cylinder cover forms a seal with the inner wall of the oil cylinder through an annular sealing ring; the cylinder cover is threadedly connected and fixed to the oil cylinder.

[0015] Furthermore, the spacing between the left fixed block and the right fixed block is adapted to the lateral width of the lower shear plate, so that when the lower shear plate moves upward with the piston to perform a shearing action with the upper shear plate, the top end of the lower shear plate is inserted between the left fixed block and the right fixed block.

[0016] Furthermore, a shear plate mounting groove matching the lower shear plate is opened on the top end surface of the piston rod of the piston, so that the bottom end of the lower shear plate is inserted into the shear plate mounting groove and fixed to the piston rod end by screws passing through the movable plug rod and the lower shear plate.

[0017] Furthermore, the shear assembly also includes two positioning plates, which are two vertically arranged strips, which are symmetrically fixed on the opposite side wall surfaces of the left fixed block and the right fixed block, and are located near the edge of the second fixed plate; the spacing between the left fixed block and the right fixed block to the upper shear plate is adapted to the thickness of the lower shear plate, so that when the lower shear plate is inserted between the left fixed block and the right fixed block, both sides of its plate surface are also clamped between the upper shear plate and the two positioning plates.

[0018] Furthermore, a concave step is provided at the top end of the inner plate surface of the first fixing plate, so that the bottom end of the upper shear plate is pressed onto the upper end surface of the concave step.

[0019] Furthermore, an upper lifting assembly is provided on the top of the oil cylinder, and a lower lifting assembly is provided on the bottom surface of the cylinder cover; wherein, the upper lifting assembly is composed of a fixing ring and two first lifting rings; the fixing ring is formed by two lifting hoops connected together, each lifting hoop comprises a semi-annular body adapted to the outer diameter of the oil cylinder, two connecting beams are radially symmetrically extended outward from both ends of the semi-annular body, two connecting screw holes and two lifting ring mounting holes are symmetrically provided on the two connecting beams; the two first lifting rings are respectively mounted on the lifting ring mounting holes on both sides of the fixing ring by bolts; the lower lifting assembly is two second lifting rings symmetrically fixed on the bottom surface of the cylinder cover.

[0020] Compared with the existing technology, the continuous tubing cutting system adopts hydraulic oil control, which can not only speed up the cutting speed and meet the continuous cutting requirements, but also realize hydraulic remote operation and reduce the safety risks of high-altitude operations; at the same time, it has the advantages of reducing the number of personnel required, saving manpower and material resources, less noise and pollution, meeting environmental protection requirements, and flexibly adapting to various construction environments and conditions, and has good market application and promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of a coiled tubing cutter in the coiled tubing cutting system of the utility model;

[0022] Figure 2 It is a side sectional view of a coiled tubing cutter in the coiled tubing cutting system of the utility model;

[0023] Figure 3 It is another side cross-sectional view of the coiled tubing cutter in the coiled tubing cutting system of the utility model;

[0024] Figure 4It is a structural schematic diagram of a shear control system in a continuous tubing shear system of the utility model. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention in any way.

[0026] See also Figure 1 , Figure 2 and Figure 3 The coiled tubing shearing system is composed of a coiled tubing shear and a shearing control system; the coiled tubing shear is composed of a shearing assembly and a shearing drive assembly.

[0027] The shear drive assembly includes a cylinder 6 , a piston 11 and a cylinder cover 12 .

[0028] The oil cylinder 6 is a cylindrical cylinder body with a closed top and an opening at the bottom. In order to facilitate the connection between the oil cylinder 6 and the upper and lower shearing components, a trapezoidal connecting boss is vertically extended upward from the center line position of the top surface of the oil cylinder 6 and is formed to install the shearing component; a piston rod through-hole is axially opened downward from the center of the top surface of the connecting boss and passes through the inner cavity of the oil cylinder 6, and a first hydraulic oil channel is obliquely opened from the side wall of the connecting boss and passes through the inner cavity of the oil cylinder 6.

[0029] The piston 11 is composed of a horizontally arranged piston plate and a piston rod vertically fixed at the center of the top surface of the piston plate; wherein the piston plate is inserted into the oil cylinder 6 from bottom to top, dividing the inner cavity of the oil cylinder 6 into an upper oil cavity and a lower oil cavity, and a double-track annular groove arranged at intervals is opened on the circumferential side wall of the piston plate, so that a seal is formed between the piston plate and the inner wall of the oil cylinder 6 through a double-track sealing ring arranged in the double-track annular groove; the upper part of the piston rod is penetrated from the piston rod penetration hole to the outside of the oil cylinder 6; a shear plate mounting groove is opened on the top end face of the piston rod.

[0030] The cylinder cover 12 is a cylindrical cover body whose outer diameter matches the inner diameter of the oil cylinder 6, so that it can be inserted and fixed at the bottom opening of the oil cylinder 6 to seal the bottom of the oil cylinder 6; a second hydraulic oil channel connecting the lower oil chamber with the outside is axially opened at the center of the cylinder cover 12.

[0031] In this embodiment, the inner diameter of the bottom end of the oil cylinder 6 is larger than the inner diameter of the upper side, so that an inner annular step is provided on the inner wall of the bottom end of the oil cylinder 6, and correspondingly, an outer annular step matching the aforementioned inner annular step is provided on the outer wall of the top end of the cylinder cover 12, so that when the cylinder cover 12 is inserted into the oil cylinder 6, the end face of the outer annular step on the cylinder cover 12 abuts against the end face of the inner annular step on the oil cylinder 6, and the cylinder cover 12 forms a seal with the inner wall of the oil cylinder 6 through an annular sealing ring built into an annular groove opened on the outer wall of the top end thereof; a connecting external thread is provided on the outer wall of the cylinder cover 12 located below the outer annular step, and correspondingly, a connecting internal thread matching the connecting external thread is provided on the inner wall of the oil cylinder 6, so that the cylinder cover 12 is threadedly connected and fixed on the oil cylinder 6.

[0032] The shear assembly includes an upper shear plate 1, a first fixing plate 2, a lower shear plate 3, a second fixing plate 10, a left fixing block 7, a right fixing block 13, two positioning plates 8 and two guide cylinders 9; specifically,

[0033] The first fixing plate 2 and the second fixing plate 10 are two vertically arranged U-plates, which are arranged in parallel and symmetrically fixed on the two side plate surfaces of the connecting boss by two bolts;

[0034] The left fixing block 7 and the right fixing block 13 are two vertically arranged strip blocks, which are symmetrically arranged and the bottom ends are respectively fixed to the two sides of the top of the inner plate surface of the second fixing plate 10 by bolts; the upper shear plate 1 is arranged in parallel between the first fixing plate 2 and the second fixing plate 10, and is arranged with its shearing edge facing downward; the two sides of the upper shear plate 1 are respectively fixed to the left fixing block 7 and the right fixing block 13 by bolts;

[0035] The lower shear plate 3 is arranged with its shearing edge facing upward, and its bottom end is inserted into the shear plate mounting groove and fixed to the piston rod end by screws sequentially penetrated on the movable plug rod and the lower shear plate 3; in actual application, the lower shear plate 3 moves upward with the piston 11 and cooperates with the upper shear plate 1 to complete the oil pipe shearing action; wherein, the lateral width of the lower shear plate 3 is adapted to the spacing between the left fixed block 7 and the right fixed block 13, so that when the lower shear plate 3 moves upward to approach the upper shear plate 1, the lower shear plate 3 is clamped between the left fixed block 7 and the right fixed block 13, and the lateral displacement of the lower shear plate 3 is limited by the left fixed block 7 and the right fixed block 13;

[0036] Preferably, both the upper shear plate 1 and the lower shear plate 3 are shear plates with a V-shaped blade structure, which helps to reduce the actual shear closing pressure, increase the shear stress, and improve the shear capacity; at the same time, both are made of 40CrNiMo material to ensure that they can withstand huge shear forces and have excellent mechanical properties and wear resistance to meet most harsh working conditions.

[0037] The two positioning plates 8 are two vertically arranged strip-shaped pieces, which are respectively fixed to the opposite side wall surfaces of the left fixing block 7 and the right fixing block 13 by multiple bolts, and are located near the edge of the second fixing plate 10, and the spacing between the left fixing block 7 and the right fixing block 13 to the upper shear plate 1 is adapted to the thickness of the lower shear plate 3, so that when the lower shear plate 3 is inserted between the left fixing block 7 and the right fixing block 13, its plate surface is also clamped between the upper shear plate 1 and the two positioning plates 8 on both sides, and the lateral movement space of the lower shear plate 3 during the upward movement is limited to avoid position displacement of the lower shear plate 3 when the upper shear plate 1 cooperates with the shearing; wherein, the difference between the left fixing block 7 and the right fixing block 13 is that the positions of the screw holes opened thereon and connected to the positioning plates 8 are different. Specifically, the screw holes on the left fixing block 7 and the right fixing block 13 are axially symmetrically opened on the plate surface near one side of the lower shear plate 3.

[0038] The guide cylinder 9 is a cylindrical rod body, and the two guide cylinders 9 are symmetrically arranged between the first fixing plate 2 and the second fixing plate 10, and are arranged close to the lower sides of the first fixing plate 2 and the second fixing plate 10; the two ends of each guide cylinder 9 are respectively vertically fixed on the first fixing plate 2 and the second fixing plate 10; a guide through groove matching the lower shear plate 3 is opened on the side walls on the opposite sides of the two guide cylinders along the movement direction of the lower shear plate 3, so that the two sides of the lower shear plate 3 are embedded in the guide through grooves on the two guide cylinders 9, so that under the limiting guiding action of the two guide cylinders 9, the lower shear plate 3 is prevented from shifting during the shearing process; wherein, the setting position of the two guide cylinders 9 is adapted to the size of the lower shear plate 3, so that when the lower shear plate 3 moves upward to the shearing position matching the upper shear plate 1, its bottom end will not separate from the guide through grooves on the two guide cylinders 9.

[0039] As a preferred technical solution of this embodiment, a concave step is provided on the top of the inner plate surface of the first fixed plate 2, so that the bottom end of the upper shear plate 1 is pressed onto the upper end surface of the concave step, ensuring that the upper shear plate 1 is firmly positioned to avoid positional displacement when cooperating with the lower shear plate 3 to perform the shearing action.

[0040] Since in actual application, the continuous tubing shearer needs to be suspended horizontally in mid-air to shear the tubing, an upper hanging assembly is provided at the top of the oil cylinder 6, and a lower hanging assembly is provided on the bottom surface of the cylinder cover 12; specifically, the upper hanging assembly is composed of a fixing ring 5 and two first hanging rings 4; the fixing ring 5 is formed by two hanging hoops connected together, each hanging hoist includes a semi-annular body adapted to the outer diameter of the oil cylinder 6, two connecting beams are radially symmetrically extended outward from both ends of the semi-annular body, and two connecting screw holes and two hanging ring mounting holes are symmetrically provided on the two connecting beams; when in use, the two hanging hoops are symmetrically arranged on both sides of the oil cylinder 6, and are fixed to the oil cylinder 6 by bolts respectively penetrated through the connecting screw holes on the two connecting beams on each side; then, the two first hanging rings 4 are respectively fixed to the fixing ring 5 by bolts penetrated through the hanging ring mounting holes on the two connecting beams on each side; the lower hanging assembly is two second hanging rings symmetrically fixed on the bottom surface of the cylinder cover 12.

[0041] When used on site in an oil field, the coiled tubing cutter is suspended horizontally in mid-air by ropes respectively passed through two first lifting rings and two second lifting rings, and the suspension height is adapted to the height of the high-position operator, so that the operator can pass the coiled tubing between the upper shear plate 1 and the lower shear plate 3 and control the hydraulic system to drive the shearing action, thereby achieving continuous shearing of any length of the coiled tubing.

[0042] See also Figure 4 The shearing control system includes a three-position four-way reversing valve 16, which is provided with an oil inlet end, an oil return end, a first oil outlet end and a second oil outlet end; wherein, the oil inlet end of the three-position four-way reversing valve 16 is connected to the oil outlet end of the hydraulic pump station through a hose 15 to realize the pumping of the hydraulic oil; its oil return end is connected to the oil return end of the hydraulic pump station through a hose 15 to realize the return of the hydraulic oil, and its first oil outlet end and the second oil outlet end are respectively connected to the first hydraulic oil channel B and the second hydraulic oil channel A of the continuous tubing shearer through a hose 15 to respectively deliver hydraulic oil to the lower oil chamber and the upper oil chamber of the oil cylinder 6 to control the movement direction of the piston in the oil cylinder 6. As a preferred technical solution of this embodiment, a first plug-in quick connector 14 is provided at the end of the hose 15 connected to the first hydraulic oil channel B, and a second plug-in quick connector 17 is provided at the end of the hose 15 connected to the second hydraulic oil channel A to realize quick connection and disconnection and save operation time. Simple operation, good sealing performance, high versatility, compact structure, and reusable

[0043] The working principle of the shear control system to control the shearing action of the coiled tubing shear is as follows:

[0044] When shearing is performed, the second hydraulic oil channel A causes the piston 11 to drive the lower shear plate 3 to move toward the direction close to the upper shear plate 1, and then the coiled tubing is cut from the specified position with the cooperation of the upper shear plate 1 and the lower shear plate 3; after the shearing action is completed, the first hydraulic oil channel B flows with oil, causing the piston 11 to drive the lower shear plate 3 to move toward the direction away from the upper shear plate 1, and the coiled tubing shearer returns to its initial state.

[0045] In summary, the shear control system can realize the remote operation of the coiled tubing shear, reduce manpower and material resources, and reduce the probability of personnel accidents.

Claims

1. A coiled tubing shearing system, characterized in that: The invention comprises a continuous tubing shear, which is composed of a shearing assembly and a shearing drive assembly; wherein, The shear drive assembly comprises an oil cylinder (6), a piston (11) and a cylinder cover (12); the oil cylinder (6) is a cylindrical cylinder body with a closed top and an opening at the bottom, and a piston rod penetration hole is provided at the center of the top surface, and a first hydraulic oil passage is provided on one side of the top surface; the piston (11) is composed of a piston plate and a piston rod, the piston plate is horizontally inserted in the oil cylinder (6) and is sealed with the oil cylinder (6), so that the inner cavity of the oil cylinder (6) is divided into an upper and a lower oil chamber, and the piston rod is vertically fixed at the center of the top surface of the piston plate, and its upper part is penetrated from the piston rod penetration hole to the outside of the oil cylinder (6); the cylinder cover (12) is sealed at the bottom opening of the oil cylinder (6), and a second hydraulic oil passage is provided on it; The shearing assembly comprises an upper shearing plate (1), a first fixing plate (2), a lower shearing plate (3), a second fixing plate (10), a left fixing block (7), a right fixing block (13) and two guide cylinders (9); the first fixing plate (2) and the second fixing plate (10) are two vertically arranged U-plates, which are arranged in parallel and their bottom ends are symmetrically fixed on the two side plate surfaces of the connecting boss; the left fixing block (7) and the right fixing block (13) are two vertically arranged strip blocks, which are symmetrically arranged and their bottom ends are respectively fixed on the two sides of the top of the inner side plate surface of the second fixing plate (10); the upper shearing plate (1) is provided with its shearing plate The lower shear plate (3) is arranged directly below the two fixed blocks with its shearing blade facing upward, and its bottom end is fixed to the top of the piston rod, so that the lower shear plate (3) and the upper shear plate (1) are arranged in a transversely offset manner; two guide cylinders (9) are vertically fixed between the first fixed plate (2) and the second fixed plate (10), and a guide through groove is respectively provided on the side walls on the opposite sides of the two guide cylinders (9) along the movement direction of the lower shear plate (3), so that the lower shear plate (3) is lifted and lowered with the piston rod in a manner that the two sides of its plate surface are embedded in the two guide through grooves.

2. The coiled tubing shearing system according to claim 1, characterized in that: It also includes a shearing control system; the shearing control system includes a three-position four-way reversing valve (16), which is provided with an oil inlet end, an oil return end, a first oil outlet end and a second oil outlet end; wherein the oil inlet end of the three-position four-way reversing valve (16) is connected to the oil outlet end of the hydraulic pump station through a rubber hose (15) to realize the pumping of hydraulic oil; the oil return end is connected to the oil return end of the hydraulic pump station through a rubber hose (15) to realize the return of hydraulic oil, and the first oil outlet end and the second oil outlet end are respectively connected to the first hydraulic oil channel and the second hydraulic oil channel of the continuous tubing shear through a rubber hose (15).

3. The coiled tubing shearing system according to claim 1, characterized in that: A trapezoidal connecting boss is vertically extended upward from the center line of the top surface of the oil cylinder (6), so that the first fixing plate (2) and the second fixing plate (10) are symmetrically fixed on the two side plate surfaces of the connecting boss; and a piston rod through hole is formed by opening downward in the vertical direction from the center of the top surface of the connecting boss.

4. The coiled tubing shearing system according to claim 1, characterized in that: In the piston (11), a double-track annular groove is provided on the circumferential side wall of the piston plate at intervals, so that a seal is formed between the piston plate and the inner wall of the oil cylinder (6) through a double-track sealing ring arranged in the double-track annular groove.

5. The coiled tubing shearing system according to claim 1, characterized in that: An inner annular step is provided on the inner wall of the bottom end of the oil cylinder, and an outer annular step matching the inner annular step is provided on the outer wall of the top end of the cylinder cover (12), so that the cylinder cover (12) is inserted into the oil cylinder (6) in such a way that the end face of the outer annular step abuts against the end face of the inner annular step on the oil cylinder (6); the top end of the cylinder cover (12) forms a seal with the inner wall of the oil cylinder (6) through an annular sealing ring; the cylinder cover (12) is threadedly connected and fixed on the oil cylinder (6).

6. The coiled tubing shearing system according to claim 1, characterized in that: The spacing between the left fixed block (7) and the right fixed block (13) is adapted to the transverse width of the lower shear plate (3), so that when the lower shear plate (3) moves upward with the piston (11) to perform a shearing action with the upper shear plate (1), the top end of the lower shear plate (3) is inserted between the left fixed block (7) and the right fixed block (13).

7. The coiled tubing shearing system according to claim 1, characterized in that: A shear plate mounting groove matching the lower shear plate (3) is provided on the top end surface of the piston rod of the piston (11), so that the bottom end of the lower shear plate (3) is inserted into the shear plate mounting groove and fixed to the rod end of the piston rod by screws passing through the movable plug rod and the lower shear plate (3).

8. The coiled tubing shearing system according to claim 1, characterized in that: The shearing assembly further comprises two positioning plates (8) which are two vertically arranged strip-shaped plates, which are symmetrically fixed on the opposite side wall surfaces of the left fixing block (7) and the right fixing block (13) and are located near the edge of the second fixing plate (10); the distances between the left fixing block (7) and the right fixing block (13) and the upper shearing plate (1) are adapted to the thickness of the lower shearing plate (3), so that when the lower shearing plate (3) is inserted between the left fixing block (7) and the right fixing block (13), both sides of its plate surface are also clamped between the upper shearing plate (1) and the two positioning plates (8) at the same time.

9. The coiled tubing shearing system according to claim 1, characterized in that: A concave step is provided at the top end of the inner plate surface of the first fixed plate (2), so that the bottom end of the upper shear plate (1) is pressed onto the upper end surface of the concave step.

10. The coiled tubing shearing system according to claim 1, characterized in that: An upper hanging assembly is arranged at the top of the oil cylinder (6), and a lower hanging assembly is arranged on the bottom surface of the cylinder cover (12); wherein the upper hanging assembly is composed of a fixing ring (5) and two first hanging rings (4); the fixing ring (5) is formed by two hanging hoops connected together, each hanging hoop comprises a semi-circular body adapted to the outer diameter of the oil cylinder (6), two connecting beams are radially symmetrically extended outward from both ends of the semi-circular body, and two connecting screw holes and two hanging ring mounting holes are symmetrically provided on the two connecting beams; the two first hanging rings (4) are respectively mounted on the hanging ring mounting holes on both sides of the fixing ring (5) by bolts; the lower hanging assembly is two second hanging rings symmetrically fixed on the bottom surface of the cylinder cover (12).

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