Energy-gathering cutting and slitting device for metal pipe columns

Abstract

The present invention provides a concentrated energy cutting and slitting device for a metal pipe string, which includes a continuous oil pipe joint, a weak point releaser, a screen gun, a detonator and a detonator connected in sequence from top to bottom; the top of the detonator is fixedly installed in the detonator, and the bottom of the detonator is fixedly connected to a cutting and slitting unit and a detonation transmission unit, there are at least two cutting and slitting units and at least one detonation transmission unit, and the cutting and slitting units and the detonation transmission units are arranged alternately, the detonator is fixedly installed in the topmost cutting and slitting unit, and the tail of the bullet is fixedly installed in the bottommost cutting and slitting unit; the concentrated energy cutting and slitting device for a metal pipe string of the present invention adopts a combination of a detonator and a plurality of cutting and slitting units, and the cutting rope is arranged on one side of the cutting and slitting unit, so as to realize multi-point and fixed-point cutting and slitting operations at different positions within a longer cutting range.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas well pipe string modification / accident handling, relates to metal pipe string cutting, and particularly relates to an energy-gathering cutting and slitting device for metal pipe strings. Background Art

[0002] During oilfield exploitation, it is often encountered that the metal pipe cannot be circulated inside and outside, resulting in the inability to continue subsequent operations. Generally, hydraulic drilling technology or energy-gathering drilling technology is used to perform drilling operations on the pipe, so that the internal and external environments of the metal pipe can be circulated to ensure the normal progress of subsequent operations in the oil and gas field.

[0003] When cutting large-diameter metal tubing, such as 7-inch casing, 5-1 / 2-inch casing, and 4-1 / 2-inch casing, hydraulic drilling generally produces smaller holes and fewer holes, requiring multiple operations to achieve the required drilling area. Furthermore, because it uses coiled tubing, multiple drilling operations increase operating costs and risks, and can easily lead to coiled tubing jams.

[0004] Energy-focused hole-cutting technology can achieve a large number of small-diameter holes at a time. When using existing energy-focused hole-cutting devices to cut large-diameter metal pipes, the following problems exist:

[0005] First, if the cutting range of the metal pipe column is long, it is difficult for the existing energy-gathering hole-opening device to achieve multi-point and fixed-point cutting and slitting at different positions within the long cutting range.

[0006] Second, since the diameter of the hole-opening device itself is relatively large, and other structures are provided in the metal pipe column, the passage left for the hole-opening device is relatively small, resulting in the hole-opening device being unable to pass through the passage in the metal pipe column. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a concentrated energy cutting and slitting device for metal pipes to solve the technical problem that the existing concentrated energy hole opening device is difficult to achieve multi-point and fixed-point cutting and slitting at different positions within a longer cutting range.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A focused energy cutting and slitting device for a metal pipe string comprises a continuous oil pipe joint, a weak point releaser, a screen gun, a detonator and a detonator connected in sequence from top to bottom; the top of the detonator is fixedly installed in the detonator, and the bottom of the detonator is fixedly connected to a cutting and slitting unit and a detonation transmission unit, there are at least two cutting and slitting units and at least one detonation transmission unit, and the cutting and slitting units and the detonation transmission units are arranged alternately, the detonator is fixedly installed in the topmost cutting and slitting unit, and the tail of the bullet is fixedly installed in the bottommost cutting and slitting unit.

[0010] The detonator includes a disconnect joint, the top of which is installed in the detonator, the top of the disconnect joint is fixedly installed in the bottom of the disconnect joint, and the bottom of the detonator joint is fixedly installed in the topmost cutting slit unit; the top and bottom ends of the disconnect joint are open, and the space between the disconnect joint and the top of the detonator joint is a disconnect charge column cavity, in which a disconnect charge column is arranged; the top and bottom ends of the detonator joint are open, and the space in the detonator joint is an explosive charge column cavity, in which an explosive charge column is arranged at the bottom of the explosive charge column cavity; a detonating tube is fixedly installed at the center of the top of the disconnect joint, the top of the detonating cord is fixedly arranged in the detonating tube, and the bottom of the detonating cord passes through the disconnect charge column and the explosive charge column in sequence from top to bottom.

[0011] The cutting slit unit includes a cutting slit shell, in which a detonator joint or a detonating unit is fixedly installed in the top of the cutting slit shell, and a detonating unit or a tail of the bullet is fixedly installed in the bottom of the cutting slit shell; the space inside the cutting slit shell is a cutting slit cavity, and a cutting rope positioning ring is provided in the bottom of one side of the cutting slit cavity, and the cutting rope positioning ring is fixedly installed on the top of the detonating unit or the tail of the bullet; a cutting rope is provided in the other side of the cutting slit cavity, and the top end of the cutting rope is in contact with the detonating charge column or the detonating unit above it, and the bottom end of the cutting rope is in contact with the detonating unit or the tail of the bullet below it, the cutting rope positioning ring is tightly against the bottom of one side of the cutting rope, and the other side of the cutting rope is fixed on the inner wall of the cutting slit shell.

[0012] The present invention also has the following technical features:

[0013] The maximum outer diameter of the energy-gathering cutting and slitting device for the metal pipe column is 30 to 40 mm.

[0014] A pair of disconnect grooves are provided on the outer wall of the disconnect joint, the pair of disconnect grooves are arranged opposite to each other, and the bottom ends of the disconnect grooves and the top ends of the disconnecting medicine columns are located in the same horizontal plane.

[0015] A positioning ring fixing hole is provided in the middle of the cutting rope positioning ring, and a positioning ring mounting screw is provided in the positioning ring fixing hole.

[0016] The central symmetry line of the cross section of the cutting rope is the cutting line, and the angle between the cutting lines of different cutting ropes is α, which is 0° to 60°.

[0017] The weakness releaser includes an upper joint of the weakness releaser, a continuous oil pipe joint is fixedly installed in the top of the upper joint of the weakness releaser, the bottom of the upper joint of the weakness releaser is fixedly installed in the top of the lower joint of the weakness releaser, and the bottom of the lower joint of the weakness releaser is fixedly installed in the screen gun; a plurality of weakness releaser shear pins are installed on the bottom of the upper joint of the weakness releaser, and the plurality of weakness releaser shear pins are evenly distributed along the circumferential direction.

[0018] A pin retaining ring is fixedly provided on the top of the lower joint of the weak point releaser, and the outer end of the shear pin of the weak point releaser is tightly pressed against the inner wall of the pin retaining ring.

[0019] The screen gun comprises a screen gun shell, a weak point releaser is fixedly installed in the top of the screen gun shell, and a detonator is fixedly installed in the bottom of the screen gun shell; a plurality of prototype holes are opened on the screen gun shell.

[0020] The detonator includes a detonator shell, a screen gun is fixedly installed on the top of the detonator shell, and a detonator is fixedly installed in the bottom of the detonator shell; the space inside the detonator shell is a detonator chamber, and a firing pin sleeve and a detonator are arranged in sequence from top to bottom in the detonator chamber, and the firing pin sleeve is movably arranged in the detonator chamber; a firing pin is fixedly installed in the firing pin sleeve, the top of the firing pin extends out of the top of the firing pin sleeve, and the bottom end of the firing pin sleeve extends out of the center of the bottom of the firing pin; a plurality of detonator shear pins are fixedly installed on the firing pin sleeve, and the firing pin is fixedly installed in the firing pin sleeve through the detonator shear pins.

[0021] The explosive transmission unit includes an explosive transmission shell, the top of which is fixedly installed in the adjacent cutting slit shell above it, and the bottom of which is fixedly installed in the adjacent cutting slit shell below it; the space inside the explosive transmission shell is an explosive transmission chamber, in which an explosive column is arranged, the top end of the explosive column is in contact with the adjacent cutting rope above it, and the bottom end of the explosive column is in contact with the adjacent cutting rope below it.

[0022] Compared with the prior art, the present invention has the following technical effects:

[0023] (I) The energy-gathering cutting and slitting device for metal pipes of the present invention utilizes a combination of a detonator and multiple cutting and slitting units, capable of performing cutting and slitting operations at multiple different locations. Since the cutting rope is disposed on one side of the cutting and slitting unit, in actual operation, the cutting and slitting unit can only perform cutting and slitting operations at metal pipes that are in close proximity to the cutting rope and are close to the cutting rope, and cannot perform cutting and slitting operations at metal pipes that are far from the cutting rope, thus achieving fixed-point cutting. Through the above-described arrangement, multi-point and fixed-point cutting and slitting operations are achieved at different locations within a relatively long cutting range.

[0024] (II) The energy-gathering cutting and slitting device for metal pipes of the present invention has a maximum outer diameter of 30 to 40 mm and can smoothly enter the interior of the metal pipe through a small water hole to achieve cutting and slitting of large-diameter metal pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1(A) is a schematic structural diagram of the upper half of an energy-gathering cutting and slitting device for a metal pipe column.

[0026] FIG1(B) is a schematic structural diagram of the lower half of the energy-gathering cutting and slitting device for metal pipe columns.

[0027] Figure 2 This is a schematic diagram of the structure of the detonator.

[0028] Figure 3 Schematic diagram of the structure of the cutting slit unit.

[0029] Figure 4 Schematic diagram of the parameters of the cutting slit unit.

[0030] Figure 5 This is a structural diagram of the weakness releaser.

[0031] Figure 6 Schematic diagram of the structure of the shear pin of the weak point releaser.

[0032] Figure 7 Schematic diagram of the structure of the screen gun.

[0033] Figure 8 Schematic diagram of the structure of the detonator.

[0034] Figure 9 This is a structural diagram of the explosive transmission unit.

[0035] Figure 10 This is a structural diagram of the slit position during cutting operation.

[0036] The meanings of the numbers in the figure are: 1-coiled tubing joint, 2-weak point releaser, 3-screen gun, 4-initiator, 5-detonator, 6-cutting slot unit, 7-detonation transmission unit, 8-tail, 9-coiled tubing, 10-effective cutting slot;

[0037] 201- upper joint of weak point release, 202- lower joint of weak point release, 203- shear pin of weak point release, 204- pin retaining ring;

[0038] 301-screen gun housing, 302-prototype aperture;

[0039] 401-detonator housing, 402-detonator chamber, 403-firing pin sleeve, 404-detonator, 405-firing pin, 406-detonator shear pin;

[0040] 501-disconnect connector, 502-detonator connector, 503-disconnect charge column cavity, 504-disconnect charge column, 505-detonating charge column cavity, 506-detonating charge column, 507-detonating tube, 508-detonating cord, 509-disconnect groove;

[0041] 601-cutting slit shell, 602-cutting slit cavity, 603-cutting cable positioning ring, 604-cutting cable, 605-positioning ring fixing hole, 606-positioning ring mounting screw;

[0042] 701-detonating shell, 702-detonating chamber, 703-detonating charge column.

[0043] The specific contents of the present invention are further explained in detail below with reference to the embodiments. DETAILED DESCRIPTION

[0044] It should be noted that, unless otherwise specified, all components and explosives in the present invention are components and explosives known in the art. For example, the disconnecting charge 504, the detonating charge 506 and the booster charge 703 are conventional shaped charges known in the prior art.

[0045] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0046] Example:

[0047] This embodiment provides a focused energy cutting and slitting device for a metal pipe string, as shown in Figures 1(A) and 1(B), comprising a continuous tubing joint 1, a weak point releaser 2, a screen gun 3, a detonator 4, and a detonator 5 connected in sequence from top to bottom. The top of the detonator 5 is fixedly installed in the detonator 4, and the bottom of the detonator 5 is fixedly connected to a cutting and slitting unit 6 and a detonation transmission unit 7. There are at least two cutting and slitting units 6 and at least one detonation transmission unit 7. The cutting and slitting units 6 and the detonation transmission units 7 are arranged alternately. The detonator 5 is fixedly installed in the topmost cutting and slitting unit 6, and the tail 8 is fixedly installed in the bottommost cutting and slitting unit 6.

[0048] like Figure 2 As shown, the detonator 5 includes a disconnect joint 501, the top of which is mounted in the detonator 4, the top of the disconnect joint 501 is fixedly mounted in the bottom of the disconnect joint 501, and the bottom of the detonator joint 502 is fixedly mounted in the topmost cutting and slit unit 6; the top and bottom ends of the disconnect joint 501 are both open, and the space between the disconnect joint 501 and the top of the detonator joint 502 is a disconnect charge cavity 503, and the disconnect charge cavity 503 is a disconnect charge cavity. A disconnect charge column 504 is provided; the top and bottom ends of the detonator joint 502 are open, the space inside the detonator joint 502 is a detonator charge column cavity 505, and a detonator charge column 506 is provided at the bottom of the detonator charge column cavity 505; a detonating tube 507 is fixedly installed at the center of the top of the disconnect joint 501, and the top of the detonating cord 508 is fixedly provided in the detonating tube 507, and the bottom of the detonating cord 508 passes through the disconnect charge column 504 and the detonating charge column 506 from top to bottom in sequence.

[0049] like Figure 3 As shown, the cutting slot unit 6 includes a cutting slot shell 601, in which the detonator joint 502 or the explosive transmission unit 7 is fixedly installed on the top of the cutting slot shell 601, and the explosive transmission unit 7 or the tail 8 is fixedly installed on the bottom of the cutting slot shell 601; the space inside the cutting slot shell 601 is a cutting slot cavity 602, and a cutting rope positioning ring 603 is provided in the bottom of one side of the cutting slot cavity 602, and the cutting rope positioning ring 603 is fixedly installed on the top of the explosive transmission unit 7 or the tail 8; a cutting rope 604 is provided in the other side of the cutting slot cavity 602, the top end of the cutting rope 604 is in contact with the detonator column 506 or the explosive transmission unit 7 above it, and the bottom end of the cutting rope 604 is in contact with the explosive transmission unit 7 or the tail 8 below it, the cutting rope positioning ring 603 is tightly against the bottom of one side of the cutting rope 604, and the other side of the cutting rope 604 is fixed on the inner wall of the cutting slot shell 601.

[0050] In this embodiment, the top surface of the detonating tube 507 is 1 to 2 mm lower than the top surface of the disconnect joint 501 , and the detonating cord 508 is a lead detonating cord.

[0051] In this embodiment, the cutting rope positioning ring 603 is similar to a semicircular ring structure, and the cross-section of the cutting rope 604 is similar to a V-shaped structure. The two ends of one side of the cutting rope 604 are tightly against the cutting rope positioning ring 603, and the other side of the cutting rope 604 is adhered and fixed to the inner wall of the cutting slit shell 601 to ensure that the cutting rope 604 remains stationary during the assembly and construction process to ensure the cutting slit effect.

[0052] In this embodiment, the material of the cutting slot shell 601 is copper or lead-antimony alloy to ensure that the cutting rope 604 forms a jet after explosion.

[0053] In this embodiment, the cutting rope 604 is made of gunpowder known in the prior art, such as RDX and Octogen, and is pressed into the designed size using a roller pressing process.

[0054] As a specific solution of this embodiment, the maximum outer diameter of the energy-focusing cutting and slitting device for the metal pipe column is 30 to 40 mm to ensure that the energy-focusing cutting and slitting device can smoothly enter the interior of the large-diameter metal pipe column.

[0055] As a specific solution of this embodiment, Figure 2 As shown, a pair of disconnect grooves 509 are provided on the outer wall of the disconnect joint 501 , and the pair of disconnect grooves 509 are arranged opposite to each other, and the bottom ends of the disconnect grooves 509 and the top ends of the disconnecting charge 504 are located in the same horizontal plane.

[0056] In this embodiment, the shell thickness at the break groove 509 is 1.5 mm to 2 mm. After the break charge 504 explodes, the break connector 501 can be separated from the break groove 509, and the diameter of the break connector 501 increases by less than 2 mm after separation. The break groove 509 is treated with a high-frequency quenching process to make the break groove 509 brittle and ensure that the flange is as small as possible during separation.

[0057] As a specific solution of this embodiment, Figure 3 As shown, a positioning ring fixing hole 605 is opened in the middle position of the cutting cable positioning ring 603, and a positioning ring mounting screw 606 is arranged in the positioning ring fixing hole 605.

[0058] In this embodiment, the cutting rope positioning ring 603 is fixedly mounted on the top of the explosive transmission unit 7 or the tail 8 by means of the positioning ring mounting screw 606 .

[0059] As a specific solution of this embodiment, Figure 4 As shown, the central symmetry line of the cross section of the cutting rope 604 is the cutting line, and the angle between the cutting lines of different cutting ropes 604 is α, which is 0° to 60°.

[0060] In this embodiment, according to actual construction requirements, the cutting cables 604 of different cutting and slitting units 6 can be coaxially arranged, that is, α is 0°; or non-coaxially arranged, that is, α is not 0°.

[0061] As a specific solution of this embodiment, the number of the cutting and slitting units 6 is six, and the cutting ropes 604 of the six cutting and slitting units 6 are set at different angles, which can achieve 360° all-round cutting.

[0062] As a specific solution of this embodiment, Figure 5 and Figure 6 As shown, the weakness releaser 2 includes a weakness releaser upper joint 201, a coiled tubing joint 1 is fixedly installed in the top of the weakness releaser upper joint 201, the bottom of the weakness releaser upper joint 201 is fixedly installed in the top of the weakness releaser lower joint 202, and the bottom of the weakness releaser lower joint 202 is fixedly installed in the screen gun 3; a plurality of weakness releaser shear pins 203 are installed on the bottom of the weakness releaser upper joint 201, and the plurality of weakness releaser shear pins 203 are evenly distributed along the circumferential direction.

[0063] In this embodiment, the principle of the weakness releaser 2 to achieve weakness release is as follows: after cutting is completed, the coiled tubing 9 is lifted upward. When the upward lifting force is greater than the shear force of the shear pin 203 of the weakness releaser, the shear pin 203 of the weakness releaser is sheared off, and the weakness releaser 2 is disengaged, ensuring that the coiled tubing 9 can be smoothly lifted out of the wellhead.

[0064] In this embodiment, the upper joint 201 of the weakness releaser is a male joint, and the lower joint 202 of the weakness releaser is a female joint. An annular groove of a certain size and depth is provided at the lower end of the upper joint 201 of the weakness releaser, and a joint hole is provided at the upper end of the lower joint 202 of the weakness releaser. When the two are fully connected in place, the position of the joint hole is opposite to the position of the annular groove, and then the shear pin 203 of the weakness releaser is inserted from the joint hole into the annular groove of the upper joint.

[0065] In this embodiment, the shear pins of the weakness releaser are pins with calibrated standard force, and the connection portion between the upper joint 201 of the weakness releaser and the lower joint 202 of the weakness releaser needs to be high-frequency quenched to ensure that the portion has high hardness and strength.

[0066] As a specific solution of this embodiment, Figure 5 and Figure 6 As shown, a pin retaining ring 204 is fixedly provided on the top of the weak point release lower joint 202 , and the outer end of the weak point release shear pin 203 is tightly pressed against the inner wall of the pin retaining ring 204 .

[0067] In this embodiment, the pin retaining ring 204 is connected to the weak point releaser lower joint 202 by means of threads. The pin retaining ring 204 can block the weak point releaser shear pin 203 to prevent the weak point releaser shear pin 203 from falling out of the joint hole.

[0068] As a specific solution of this embodiment, Figure 7 As shown, the screen gun 3 includes a screen gun housing 301 , a weak point releaser 2 is fixedly installed in the top of the screen gun housing 301 , and the bottom of the screen gun housing 301 is fixedly installed in the detonator 4 ; a plurality of prototype holes 302 are opened on the screen gun housing 301 .

[0069] In this embodiment, the top of the screen gun housing 301 is connected to the weak point release lower joint 202 by a threaded connection, and the bottom of the screen gun housing 301 is connected to the initiator housing 401 by a threaded connection.

[0070] In this embodiment, Figure 7 As shown, the inner diameter of the prototype small hole 302 is no more than 5 mm, which can play a role in sand prevention.

[0071] In this embodiment, a retaining screw is fixedly installed on the top of the screen gun housing 301 to ensure a stable connection between the screen gun housing 301 and the weak point releaser lower connector 202 .

[0072] As a specific solution of this embodiment, Figure 8 As shown, the detonator 4 includes a detonator shell 401, a screen gun 3 is fixedly installed on the top of the detonator shell 401, and a detonator 5 is fixedly installed in the bottom of the detonator shell 401; the space in the detonator shell 401 is a detonator cavity 402, and a firing pin sleeve 403 and a detonator 404 are sequentially arranged in the detonator cavity 402 from top to bottom, and the firing pin sleeve 403 is movably arranged in the detonator cavity 402; a firing pin 405 is fixedly installed in the firing pin sleeve 403, and the top of the firing pin 405 extends out of the top of the firing pin sleeve 403, and the bottom center of the firing pin 405 extends out of the bottom of the firing pin sleeve 403; a plurality of detonator shear pins 406 are fixedly installed on the firing pin sleeve 403, and the firing pin 405 is fixedly installed in the firing pin sleeve 403 through the detonator shear pins 406.

[0073] In this embodiment, after the wellbore is pressurized, the pressure enters the screen gun 3 and the detonator chamber 402 in sequence, and the detonator shear pin 406 is broken under the action of the pressure, and the firing pin 405 strikes and detonates the detonator 404, achieving ignition and detonation.

[0074] As a specific solution of this embodiment, Figure 9As shown, the explosive transmission unit 7 includes an explosive transmission shell 701, the top of the explosive transmission shell 701 is fixedly installed in the adjacent cutting slit shell 601 above it, and the bottom of the explosive transmission shell 701 is fixedly installed in the adjacent cutting slit shell 601 below it; the space inside the explosive transmission shell 701 is an explosive transmission cavity 702, and an explosive column 703 is arranged in the explosive transmission cavity 702, the top end of the explosive column 703 is in contact with the adjacent cutting rope 604 above it, and the bottom end of the explosive column 703 is in contact with the adjacent cutting rope 604 below it.

[0075] In this embodiment, the top and bottom surfaces of the explosive charge column 703 are respectively 2 mm to 3 mm lower than the top and bottom ends of the explosive shell 701 , and the explosive charge column 703 is fixed inside the explosive shell 701 by a retaining spring.

[0076] In this embodiment, the total charge of the disconnecting charge 504, the detonating charge 506, and the booster charge 703 must match the overall strength of the housing of the shaped-charge cutting and slitting device. Excessive charge can cause severe damage and deformation of the housing, significantly increasing and becoming irregular in its outer diameter. This can prevent the tool string from being smoothly pulled out of the wellbore after completion, leading to a possible jam. On the other hand, if the charge is too low, the disconnecting connector 501 cannot be completely disconnected from the disconnecting groove 509, which can also easily lead to a possible jam.

[0077] The working process of the present invention is as follows:

[0078] First, assemble and connect the coiled tubing joint 1, weak point releaser 2, screen gun 3, detonator 4 and detonator 5, cutting and slitting unit 6, detonation transmission unit 7 and tail 8 in sequence. Then connect the coiled tubing 9 to the top of the coiled tubing joint 1. Use the coiled tubing 9 to lower the energy-focused cutting and slitting device to the designed slitting position.

[0079] Second, pressure is applied at the wellhead, and the pressure is transmitted to the detonator 4 along the coiled tubing joint 1, the weakness releaser 2, and the screen gun 3 in sequence, causing the detonator 4 to detonate. The detonation wave generated by the detonation of the detonator 4 propagates downward, detonating the disconnection charge 504. After the disconnection charge 504 is detonated, the disconnection joint 501 is disconnected from the disconnection groove 509. At the same time, the detonation wave propagates to detonate the detonating charge 506, thereby detonating the topmost cutting slit unit 6 connected to the detonator 5, causing the cutting rope 604 to detonate.

[0080] Third, after the cutting rope 604 is detonated, it cooperates with the cutting slit shell 601 to form a metal energy-focused jet, forming an effective cutting gap 10 on the large-diameter metal pipe column. At the same time, the detonation wave detonates the explosive transmission unit 7 connected to the topmost cutting slit unit 6, and detonates the next cutting slit unit 6 until all the cutting slit units 6 are exploded, completing a cutting operation.

[0081] like Figure 10 As shown, during the actual operation, each cutting slit unit 6 can only form an effective cutting gap 10 in a close position and close to the cutting rope 604. According to the different cutting target pipe strings and the different slit sizes, multiple cutting slit units 6 can be selected for connection to ensure that enough effective cutting gaps 10 are formed.

[0082] Fourth, after the cutting operation is completed, the portion above the cut groove 509 or above the weak point release shear pin 203 can be lifted out of the wellhead through the coiled tubing 9, and the remaining residue is left in the well.

Claims

1. A device for cutting and slitting metal pipes, characterized in that: The invention comprises a continuous tubing joint (1), a weak point releaser (2), a screen gun (3), a detonator (4) and a detonator (5) connected in sequence from top to bottom; the top of the detonator (5) is fixedly installed in the detonator (4), the bottom of the detonator (5) is fixedly connected with a cutting slot unit (6) and a detonation transmission unit (7), there are at least two cutting slot units (6), and there is at least one detonation transmission unit (7), the cutting slot units (6) and the detonation transmission unit (7) are arranged alternately, the detonator (5) is fixedly installed in the cutting slot unit (6) at the top, and the tail (8) is fixedly installed in the cutting slot unit (6) at the bottom; The detonator (5) includes a disconnect joint (501), the top of the disconnect joint (501) is installed in the detonator (4), the bottom of the disconnect joint (501) is fixedly installed on the top of the detonator joint (502), and the bottom of the detonator joint (502) is fixedly installed in the topmost cutting slit unit (6); the top and bottom ends of the disconnect joint (501) are both open, and the space between the disconnect joint (501) and the top of the detonator joint (502) is a disconnect charge column cavity (503), and a disconnect charge column cavity (503) is provided. There is a disconnecting charge column (504); the top and bottom ends of the detonator joint (502) are both open, the space inside the detonator joint (502) is a detonating charge column cavity (505), and a detonating charge column (506) is arranged in the bottom of the detonating charge column cavity (505); a detonating tube (507) is fixedly installed at the center of the top of the disconnecting joint (501), the top of the detonating cord (508) is fixedly arranged in the detonating tube (507), and the bottom of the detonating cord (508) passes through the disconnecting charge column (504) and the detonating charge column (506) in sequence from top to bottom; The cutting slot unit (6) comprises a cutting slot shell (601), a detonator connector (502) or a detonation transmission unit (7) is fixedly installed in the top of the cutting slot shell (601), and a detonation transmission unit (7) or a bullet tail (8) is fixedly installed in the bottom of the cutting slot shell (601); the space in the cutting slot shell (601) is a cutting slot cavity (602), and a cutting rope positioning ring (603) is provided in the bottom of one side of the cutting slot cavity (602), and the cutting rope positioning ring (603) is fixedly installed in the cutting slot shell (601). On the top of the explosive transmission unit (7) or the tail (8); a cutting rope (604) is provided in the other side of the cut slit cavity (602), the top of the cutting rope (604) contacts the detonating charge column (506) or the explosive transmission unit (7) above it, the bottom of the cutting rope (604) contacts the explosive transmission unit (7) or the tail (8) below it, the cutting rope positioning ring (603) is tightly against the bottom of one side of the cutting rope (604), and the other side of the cutting rope (604) is fixed on the inner wall of the cut slit shell (601).

2. The energy-gathering cutting and slitting device for a metal pipe column according to claim 1, characterized in that: The maximum outer diameter of the energy-gathering cutting and slitting device for the metal pipe column is 30 to 40 mm.

3. The energy-gathering cutting and slitting device for a metal pipe column according to claim 1, characterized in that: A pair of disconnection grooves (509) are provided on the outer wall of the disconnection joint (501), and the pair of disconnection grooves (509) are arranged opposite to each other, and the bottom ends of the disconnection grooves (509) and the top ends of the disconnection charge (504) are located in the same horizontal plane.

4. The energy-gathering cutting and slitting device for a metal pipe column according to claim 1, characterized in that: A positioning ring fixing hole (605) is provided in the middle of the cutting rope positioning ring (603), and a positioning ring mounting screw (606) is provided in the positioning ring fixing hole (605).

5. The energy-gathering cutting and slitting device for metal pipes according to claim 1, characterized in that: The central symmetry line of the cross section of the cutting rope (604) is the cutting line, and the angle between the cutting lines of different cutting ropes (604) is α, and α is 0° to 60°.

6. The energy-gathering cutting and slitting device for a metal pipe column according to claim 1, characterized in that: The weakness releaser (2) comprises a weakness releaser upper joint (201), a continuous oil pipe joint (1) is fixedly installed in the top of the weakness releaser upper joint (201), the bottom of the weakness releaser upper joint (201) is fixedly installed in the top of the weakness releaser lower joint (202), and the bottom of the weakness releaser lower joint (202) is fixedly installed in the screen gun (3); a plurality of weakness releaser shear pins (203) are installed on the bottom of the weakness releaser upper joint (201), and the plurality of weakness releaser shear pins (203) are evenly distributed along the circumferential direction.

7. The energy-gathering cutting and slitting device for a metal pipe column according to claim 6, characterized in that: A pin retaining ring (204) is fixedly provided on the top of the weak point releaser lower joint (202), and the outer end of the weak point releaser shear pin (203) is tightly pressed against the inner wall of the pin retaining ring (204).

8. The energy-gathering cutting and slitting device for a metal pipe column according to claim 1, characterized in that: The screen tube gun (3) comprises a screen tube gun housing (301), a weak point releaser (2) is fixedly installed in the top of the screen tube gun housing (301), and the bottom of the screen tube gun housing (301) is fixedly installed in the detonator (4); a plurality of circular small holes (302) are opened on the screen tube gun housing (301).

9. The energy-gathering cutting and slitting device for a metal pipe column according to claim 1, characterized in that: The detonator (4) comprises a detonator shell (401), a screen gun (3) is fixedly installed on the top of the detonator shell (401), and a detonator (5) is fixedly installed in the bottom of the detonator shell (401); the space in the detonator shell (401) is a detonator chamber (402), and a firing pin sleeve (403) and a detonator (404) are arranged in sequence from top to bottom in the detonator chamber (402), and the firing pin sleeve (403) is movably arranged on the detonator. The firing pin (405) is fixedly mounted in the firing pin sleeve (403), the top of the firing pin (405) extends out of the top of the firing pin sleeve (403), and the center of the bottom of the firing pin (405) extends out of the bottom of the firing pin sleeve (403); a plurality of detonator shear pins (406) are fixedly mounted on the firing pin sleeve (403), and the firing pin (405) is fixedly mounted in the firing pin sleeve (403) through the detonator shear pins (406).

10. The energy-gathering cutting and slitting device for a metal pipe column according to claim 1, characterized in that: The explosive transmission unit (7) includes an explosive transmission shell (701), the top of the explosive transmission shell (701) is fixedly installed in the adjacent cutting slit shell (601) above it, and the bottom of the explosive transmission shell (701) is fixedly installed in the adjacent cutting slit shell (601) below it; the space inside the explosive transmission shell (701) is an explosive transmission chamber (702), and an explosive column (703) is arranged in the explosive transmission chamber (702), the top end of the explosive column (703) is in contact with the adjacent cutting rope (604) above it, and the bottom end of the explosive column (703) is in contact with the adjacent cutting rope (604) below it.

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