CN116201496A

CN116201496A - Self-positioning perforating tool for downhole oil pipe safety valve

Info

Publication number: CN116201496A
Application number: CN202310174190.8A
Authority: CN
Inventors: ***; 赖伟华; 庞瑞杰; 李江平; 陈仁锦; 周茂勇; 陈钦涛; 蒋砚
Original assignee: Baiqin Energy Technology Huizhou Co ltd
Current assignee: Baiqin Energy Technology Huizhou Co ltd
Priority date: 2023-02-24
Filing date: 2023-02-24
Publication date: 2023-06-02

Abstract

The invention discloses a self-positioning perforating tool for an underground oil pipe safety valve, which belongs to the technical field of oil and gas exploitation equipment, and mainly adopts the technical scheme that the self-positioning perforating tool comprises a fishing head, a holding assembly, a mounting sleeve, a locking block assembly and a self-positioning assembly which are connected from top to bottom, and also comprises a directional rod and a punching head assembly; the self-positioning assembly comprises a main mandrel, a torsion spring and a split bushing, wherein the split bushing is connected with the locking block assembly, and the torsion spring is connected with the split bushing and the main mandrel; a positioning release shear pin which can be sheared when impacted is connected between the main core shaft and the locking block assembly; the main core shaft is provided with a positioning block, and the blundering head assembly is arranged on the main core shaft. According to the invention, the locking block assembly, the self-positioning assembly and the split-type punch head assembly are arranged, so that the punching tool can be positioned more accurately and efficiently, and the tool for completing the punching operation can be taken out conveniently and easily.

Description

Self-positioning perforating tool for downhole oil pipe safety valve

Technical Field

The invention relates to the technical field of oil and gas exploitation equipment, in particular to a self-positioning perforation tool for an underground oil pipe safety valve.

Background

The underground safety valve is one kind of emergency safety device for oil and gas exploitation. By closing the safety valve when the downhole operation is completed, or when unexpected safety accidents, such as blowout and kick, occur, the potential risk can be reduced. However, when the underground safety valve fails and cannot be normally opened or closed, or the hydraulic piston system of the safety valve is not tightly sealed, measures are needed to remedy the leakage.

A common remedy is to run another wire relief valve into the well, which has a smaller outer diameter than the original relief valve, instead of the original relief valve. Because the steel wire safety valve is generally hung in the original safety valve, the normal operation is realized by the hydraulic control system of the original safety valve, and the hydraulic piston hole of the original oil pipe safety valve is broken down by using a perforation tool before the steel wire safety valve is put in, so that the communication between the hydraulic piston hole and the inside of the oil pipe is realized, and the hydraulic pressure support is provided for the steel wire safety valve.

Therefore, referring to fig. 1, in order to facilitate breakdown of the hydraulic piston hole of the original oil pipe relief valve, a top joint 01 is generally disposed on the original relief valve, and a thin wall 03 near the hydraulic piston hole is disposed on the side wall of the relief valve, so as to facilitate the punching operation.

The existing perforating tool mainly adopts a hydraulic perforating mode and a mechanical perforating mode. The hydraulic perforation mode needs to be additionally provided with a pressure pump to provide power, and the risk of operation failure caused by leakage due to damage of a perforation tool sealing element exists; the mechanical perforation mode is generally an inclined plane chute type, namely, the shear pins are sheared by applying external force to start perforation. The mechanical punching mode is simpler and more convenient to operate, but the punch head is not easy to separate from the pipe wall due to the fact that the punch head is clamped on the pipe wall, so that the whole tool is blocked when being taken out, and the requirement on punching and positioning of a punching tool is very high for some safety valves with special piston hole positions, such as oil pipe safety valves with eccentric small piston rod sealing structures, and the existing punching tool is often subjected to error punching due to inaccurate positioning, so that unnecessary loss is caused.

For example, a chinese patent document with an authorized bulletin number of CN108222874B discloses an underground tapping tool, which has a main technical scheme that the underground tapping tool comprises an upper nipple, a middle nipple and a lower nipple connected in sequence from top to bottom, wherein an upper mandrel sleeve is sleeved on an inner wall of the upper nipple near the upper part through a clamping block, an upper mandrel is sleeved in the upper mandrel sleeve, a lower mandrel is arranged below the upper mandrel, and a locking sleeve is sleeved on an inner wall of the upper nipple near the lower part; the periphery of the lower part of the middle nipple is provided with a main clamping block, and the upper end surface of the main clamping block is tightly contacted with the lower end surface of the locking sleeve in a propping way; the lower nipple is hung with a lower mandrel near the upper part through a shear pin; the lower nipple is provided with a positioning block near the outer circumference of the middle part, the upper end surface of the positioning block is positioned by a positioning pin, and the lower nipple is provided with an opening mechanism near the lower part. The structure of the tapping mechanism is that a radial hole is formed in the lower short section near the lower part, an edge block is slidably arranged in the radial hole, the outer edge of the radial hole is of a groove structure, a cover plate is fixed in the groove through countersunk screws, and a spring is arranged between the edge block and the cover plate.

When the tapping tool is used, after the tapping tool is locked on the safety valve, the tapping tool is required to be rotated through external force applied additionally, so that the positioning block is clamped in a corresponding clamping groove of the underground safety valve body, positioning of the tapping mechanism can be achieved, and during operation, the rotation angle and the force are not easy to grasp, so that positioning is inaccurate and efficient, and the tapping tool is inconvenient to use. In addition, the blade block of the tapping tool is easy to be clamped on the side wall of the safety valve after the tapping task is completed, so that the tapping tool is difficult to take out entirely, and unnecessary loss is caused.

In view of this, there is a need for improvements in existing downhole safety valve perforating tools that ensure that the downhole perforating operation is completed successfully.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a self-positioning perforating tool for an underground oil pipe safety valve, which is used for positioning the perforating tool more accurately and efficiently and conveniently and easily taking out the tool for completing the perforating operation.

The invention discloses a self-positioning perforating tool for an underground oil pipe safety valve, which is characterized by comprising a fishing head, a holding assembly, a mounting sleeve, a locking block assembly and a self-positioning assembly which are connected from top to bottom, and further comprising a directional rod and a punch head assembly; the self-positioning assembly comprises a main mandrel, a torsion spring and a split bushing, wherein the split bushing is connected with the locking block assembly, and the torsion spring is connected with the split bushing and the main mandrel; a positioning release shear pin which can be sheared when impacted is connected between the main core shaft and the locking block assembly; the main core shaft is provided with a positioning block, and the blundering head assembly is arranged on the main core shaft.

Preferably, the lock block assembly comprises a lock block holder connected with the mounting sleeve, a support leaf spring connected with the lock block holder and a positioning lock block mounted on the lock block holder.

Preferably, the punch head assembly comprises a punch head seat, a punch head and a connecting shear pin, wherein the connecting shear pin is connected between the punch head seat and the punch head.

Preferably, the orientation rod is connected with the fishing head, and a second shearing pin which can be sheared when impacted is connected between the orientation rod and the main core shaft.

Preferably, the holding assembly comprises a front end holder, a shear block, a bump bracket and an expansion cylinder which are connected from top to bottom; a first shearing pin capable of being sheared when impacted is connected between the shearing block and the salvaging head, and a shearing screw capable of being sheared when impacted is connected between the expansion cylinder and the locking block retainer.

Preferably, the holding assembly further comprises a connecting joint and a positioning lug, the positioning lug is movably arranged on the lug support, and the mounting sleeve is provided with a positioning groove; the connecting joint is connected with the salvaging head and the positioning convex block.

Preferably, the fishing head is provided with a mounting hole, the orientation rod comprises a rod body and a connecting cap, the connecting cap is arranged at one end of the rod body, and the connecting cap is arranged in the mounting hole; and a split ring is arranged between the connecting joint and the salvaging head, and the rod body penetrates through the split ring.

Preferably, the orientation rod comprises a rod body and a punching cone, wherein a guide cone surface is arranged on the punching cone, a matching inclined surface is arranged on the punching head seat, and the guide cone surface and the matching inclined surface are arranged in a mutually facing manner.

Preferably, a spring block positioning hole is formed in the main mandrel, and the positioning block is arranged at the spring block positioning hole and is elastically connected with the main mandrel; and the perforating cone is provided with a yielding groove, and the yielding groove corresponds to the elastic block positioning hole.

Preferably, a punch head hole is formed in the main mandrel, and the punch head assembly is mounted at the punch head hole.

The beneficial effects of this application lie in:

firstly, the perforating tool is put into the well by utilizing the steel wire tool, and the perforating function can be realized by continuously shocking the salvaging head, so that compared with hydraulic perforation, the method has the advantages of no need of additionally providing a pressure pump to provide pressure, simpler and more convenient operation and saving operation cost, and avoids the risk of operation failure caused by damage and leakage of a sealing element of the perforating tool in a hydraulic perforation mode;

Secondly, the perforating tool can realize axial and radial bidirectional self-positioning, and the positioning is more accurate. When the oil pipe safety valve enters the top connector of the oil pipe safety valve, the positioning locking block can be hung in the sitting groove, and the axial positioning of the tool can be realized after the positioning locking block is rigidly supported by the expansion cylinder; when the positioning release shear pin is sheared off, the torsion spring resets under the action of self elasticity to drive the main spindle to rotate, meanwhile, the positioning block and the punch head component rotate along with the main spindle, when the positioning block rotates to the positioning groove, the positioning block is clamped in the positioning groove under the action of the elasticity, at the moment, the positions of the main spindle and the punch head component are locked, the corresponding direction of the punch head component only faces the thin wall of the hydraulic piston cavity of the oil pipe safety valve, radial positioning is realized, positioning is more accurate, and false punching is avoided;

finally, after punching, the punch head component of the split structure can shear the connecting shear pin under the action of impact force when the tool is integrally salvaged, and the punch head is discarded, so that the problem that the traditional punch head is difficult to separate when meeting the blockage during underground punching is avoided, and further the situation that the whole tool is taken out to be blocked is caused, and the risk of integral scrapping of the tool caused by local damage of the tool is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

FIG. 1 is a cross-sectional view of a top joint of an oil line safety valve;

FIG. 2 is a schematic diagram of the overall structure of the present invention;

FIG. 3 is a cross-sectional view of the present invention;

FIG. 4 is an enlarged partial schematic view of the portion I of FIG. 3 illustrating the structure of the retention assembly;

FIG. 5 is a cross-sectional view taken along section B-B of FIG. 4, illustrating the attachment of the shear block to the fishing head;

FIG. 6 is an enlarged partial schematic view of portion II of FIG. 3 showing the configuration of the retaining assembly, the locking block assembly and the self-positioning assembly;

FIG. 7 is a schematic view of the construction of the lock block retainer and its attachment and split bushing;

FIG. 8 is a cross-sectional view taken along section C-C of FIG. 6, illustrating the connection of the orientation rod to the primary spindle;

FIG. 9 is an enlarged partial schematic view of portion III of FIG. 3 showing the construction of the self-locating assembly and the punch head assembly;

FIG. 10 is an enlarged partial schematic view at A in FIG. 9 for illustrating the construction of the pin head assembly;

FIG. 11 is a cross-sectional view taken along section D-D of FIG. 9, illustrating the connection of the pin head assembly to the main shaft;

FIG. 12 is a cross-sectional view of the present invention seated on the top joint of the oil line safety valve.

Reference numerals illustrate:

01. a top joint; 011. a seating groove; 02. a drop slot; 03. a thin wall;

1. a fishing head; 11. a mounting hole; 12. pin holes I;

2. a retention assembly; 21. a front end holder; 22. cutting into blocks; 221. a pin hole II; 222. shearing a first pin; 23. a bump bracket; 231. a bump hole; 232. a first fastening hole; 2320. a first set screw; 24. positioning the protruding blocks; 25. an expansion cylinder; 251. cutting the slot; 2510. cutting a screw; 252. a positioning groove; 253. a guide groove; 26. a connection joint; 27. split ring;

3. a directional rod; 31. a shaft; 311. a guide groove; 312. a pin hole III; 32. a connecting cap; 33. a perforating cone; 331. a guiding conical surface; 332. a relief groove;

4. a mounting sleeve; 41. a positioning groove;

5. a lock block assembly; 51. a lock block holder; 511. a locking piece groove; 5111. a leaf spring groove; 512. a leaf spring hole; 513. a mounting groove; 5131. a pin hole; 5132. screw holes; 514. cutting the screw hole; 515. a pin hole IV; 52. a supporting leaf spring; 53. positioning a locking piece; 54. an expansion guide assembly; 541. a set screw; 542. a pressing plate; 543. a guide pin;

6. A self-positioning assembly; 61. a main spindle; 610. a main core hole; 611. a fifth pin hole; 6111. a second shearing pin; 612. guide pin holes; 6121. a lever guide pin; 613. a pin hole is six; 6131. positioning and releasing the shear pin; 6132. a stop step; 614. a spring locking groove; 6141. a spring tightens the nut; 615. a limiting pin; 616. punching a head hole; 6161. an expansion slot; 617. a punch head positioning hole; 618. an impact ramp; 619. a spring block positioning hole; 62. a split bushing; 621. a spring positioning hole; 622. a second fastening hole; 623. a hit inclined plane; 63. a spring sleeve; 631. a third fastening hole; 632. a spring sleeve set screw; 64. a torsion spring; 65. a positioning block; 66. a punch head limiter;

7. a punch head assembly; 71. a punch seat; 711. matching with the inclined plane; 712. a connection hole; 713. a blanking hole; 714. a locking hole; 715. a limit step; 72. punching the punch pin; 721. a connecting pin hole; 722. a pressure release hole; 73. connecting a shear pin; 74. a nut is tightly fixed; 75. and shearing the pin.

Detailed Description

Various embodiments of the invention are disclosed in the following drawings, in which details of the practice are set forth in the following description for the purpose of clarity. However, it should be understood that these practical details are not to be taken as limiting the invention. That is, in some embodiments of the invention, these practical details are unnecessary. Moreover, for the sake of simplicity of the drawing, some well-known and conventional structures and elements are shown in the drawings in a simplified schematic manner.

It should be noted that all directional indications such as up, down, left, right, front, and rear … … in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture such as that shown in the drawings, and if the particular posture is changed, the directional indication is changed accordingly.

In addition, the descriptions of the "first", "second", etc. in this application are for descriptive purposes only and are not intended to specifically indicate a sequential or a cis-position, nor are they intended to limit the invention, but are merely intended to distinguish between components or operations described in the same technical term, and are not to be construed as indicating or implying a relative importance or implying that the number of technical features indicated is not necessarily limited. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

For a further understanding of the invention, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:

referring to fig. 2 and 3, for a downhole oil pipe safety valve self-positioning perforating tool disclosed by the invention, the tool comprises a fishing head 1, a holding component 2, a directional rod 3, a mounting sleeve 4, a locking block component 5, a self-positioning component 6 and a punch head component 7, wherein in use, the fishing head 1, the holding component 2, the mounting sleeve 4, the locking block component 5 and the self-positioning component 6 are installed along a central axis from top to bottom, the directional rod 3 penetrates through the inside of the components, the punch head component 7 is installed on the self-positioning component 6, the fishing head 1 is used for connecting a steel wire tool, the operations of descending, beating, fishing and the like are convenient, the holding component 2 is used for limiting the positions of the fishing head 1 and the directional rod 3, the directional rod 3 is used for transmitting perforating force to the punch head component 7, the mounting sleeve 4 is used for mounting and positioning the holding component 2 and the locking block component 5, the locking block component 5 is used for enabling the whole tool to be positioned on a top joint 01 of the oil pipe safety valve, the self-positioning component 6 is used for positioning the punch head component 7, and the punch head 7 is used for directly perforating.

Referring to fig. 2-5, the fishing head 1 is of a solid rod-shaped structure as a whole, one end of the fishing head 1 is provided with a mounting hole 11, the mounting hole 11 is a round blind hole and is arranged coaxially with the fishing head 1, and one end of the directional rod 3 is penetrated in the mounting hole 11; the outer peripheral wall of the fishing head 1, which is close to one end of the mounting hole 11, is provided with threads for connecting and matching with the holding assembly 2; the outer peripheral wall of the fishing head 1 is also provided with a plurality of first pin holes 12, specifically, two groups of first pin holes 12 are arranged, each group of first pin holes 12 is provided with two, and the two groups of first pin holes 12 are oppositely arranged on the outer peripheral wall of the fishing head 1.

Referring to fig. 2 to 6, the holding assembly 2 includes a front end holder 21, a shear block 22, a bump bracket 23, a positioning bump 24, an expansion cylinder 25, a connection joint 26 and a split ring 27, wherein the front end holder 21 is a cylindrical structure with openings at both ends, the front end holder 21 is sleeved on the fishing head 1, a step for matching with the shear block 22 is provided on the inner wall of the front end holder 21, and threads are provided on the inner peripheral wall of the front end holder 21 for connection with the bump bracket 23; the shear block 22 is of a circular arc-shaped sheet structure, the shear block 22 is provided with two shear blocks 22, the two shear blocks 22 are symmetrically arranged on the peripheral wall of the fishing head 1 in a surrounding mode, two pin holes II 221 are formed in each shear block 22, the two pin holes II 221 in each shear block 22 correspond to the two groups of pin holes I12 respectively, a shear pin I222 is arranged in each pin hole I12 and each pin hole II 221 in a penetrating mode, the position of the shear block 22 is limited by the shear pin I222, the shear block 22 is relatively fixed with the fishing head 1, in addition, the shear block 22 is in contact with a step of the front end retainer 21, and therefore the position of the shear block 22 can be limited by the front end retainer 21.

Referring to fig. 4 to 6, the bump bracket 23 is a cylindrical structure having openings at both ends, the bump bracket 23 is provided with threads on an outer circumferential wall near one end thereof, and threads are also provided on an inner circumferential wall near the other end thereof, a portion of the bump bracket 23 having threads on the outer circumferential wall penetrates into the front end holder 21 and is screwed with the front end holder 21, the side wall of the bump bracket 23 is provided with steps near the threads of the outer circumferential wall of the bump bracket 23, the steps of the bump bracket 23 are connected with the end of the front end holder 21 so that the outer circumferential wall of the bump bracket 23 and the outer circumferential wall of the front end holder 21 can be on the same cylindrical surface; a plurality of lug holes 231 are formed in the side wall of the lug support 23, specifically, two lug holes 231 are formed in the lug support 23, the two lug holes 231 are oppositely arranged along the radial direction of the cross section circumference of the lug support 23, each lug hole 231 is internally provided with one positioning lug 24, the lug holes 231 are through holes, and the positioning lugs 24 movably penetrate through the lug holes 231.

Referring to fig. 4, the connection joint 26 is a cylindrical structure with two open ends, the connection joint 26 is provided with threads on the inner peripheral wall near one end thereof, one end of the fishing head 1 provided with the mounting hole 11 penetrates into the connection joint 26, the outer peripheral wall threads of the fishing head 1 are matched with the inner peripheral wall threads of the connection joint 26, the fishing head 1 is fixedly connected with the connection joint 26 by threads, and the directional rod 3 penetrates into the inner ring of the connection joint 26; steps are arranged on the inner wall and the outer wall of the connecting joint 26, split rings 27 are arranged between the steps on the inner wall of the connecting joint 26 and the end part of the fishing head 1, each split ring 27 is of a semicircular annular structure, the two split rings 27 form a circle, the two split rings 27 are arranged on the orientation rod 3 in a surrounding mode, the orientation rod 3 passes through the middle of the circle formed by the two split rings 27, the axial position of the split rings 27 is limited by the end part of the fishing head 1 and the steps of the connecting joint 26, and the split rings 27 are used for limiting the position of the orientation rod 3; the positioning cam 24 is connected to a step on the outer wall of the connection piece 26, so that the connection piece 26 can transmit forces in the axial direction to the cam carrier 23 via the positioning cam 24.

Referring to fig. 6, the extension cylinder 25 is of a cylindrical structure with two open ends, the outer circumferential wall of the extension cylinder 25 near one end thereof is provided with threads, a portion of the outer circumferential wall of the extension cylinder 25 provided with threads penetrates into the bump bracket 23 and is matched with the threads on the inner circumferential wall of the bump bracket 23, so that the extension cylinder 25 is fixedly connected with the bump bracket 23 in threads, the bump bracket 23 is provided with a first fastening hole 232 on the side wall of the portion overlapping with the extension cylinder 25, the first fastening hole 232 is a threaded through hole, a first fastening screw 2320 is arranged in the first fastening hole 232 in a penetrating manner, and the first fastening screw 2320 is connected in the first fastening hole 232 in a threaded manner and is abutted against the extension cylinder 25, so that the relative position between the extension cylinder 25 and the bump bracket 23 can be locked.

Referring to fig. 3 and 6, the installation sleeve 4 is a cylindrical structure with two open ends, the installation sleeve 4 is sleeved on the outer sides of the front end retainer 21, the bump bracket 23 and the expansion cylinder 25 and is in sliding connection with the front end retainer 21 and the bump bracket 23, a positioning groove 41 matched with the positioning bump 24 is formed on the inner wall of the installation sleeve 4, when the bump bracket 23 axially slides to a position corresponding to the positioning groove 41 through the bump hole 231, the positioning bump 24 can enter the positioning groove 41 under the pushing of a step on the outer wall of the connecting joint 26, so that the relative position between the bump bracket 23 and the installation sleeve 4 is locked; the inner peripheral wall of the end, deviating from the fishing head 1, of the mounting sleeve 4 is provided with threads for being connected and matched with the locking block assembly 5.

Referring to fig. 6 to 8, the lock block assembly 5 includes a lock block holder 51, a supporting leaf spring 52, a positioning lock block 53 and an expansion guide assembly 54, wherein the lock block holder 51 is of a cylindrical structure with both ends open, the lock block holder 51 is provided with threads on an outer peripheral wall near one end thereof and threads on an inner peripheral wall near the other end thereof, and one end of the outer peripheral wall of the lock block holder 51 provided with threads penetrates into the mounting sleeve 4 and is in threaded connection with the mounting sleeve 4; the side wall of the lock block holder 51 is provided with a plurality of lock block grooves 511, specifically, the lock block grooves 511 are provided with three, the three lock block grooves 511 are uniformly distributed at equal intervals along the circumferential direction of the outer wall of the lock block holder 51, the lock block grooves 511 penetrate through the side wall of the lock block holder 51, the edge of each lock block groove 511 is provided with a strip-shaped leaf spring groove 5111 along the axial direction, the leaf spring grooves 5111 also penetrate through the side wall of the lock block holder 51, in addition, the side wall of the lock block holder 51 is provided with leaf spring holes 512 the same as the lock block grooves 511 in number, and each leaf spring hole 512 corresponds to one leaf spring groove 5111 along the axial direction.

Referring to fig. 6 to 8, each of the locking piece grooves 511 of the locking piece holder 51 is provided with one of the above-mentioned locking pieces 53, the locking piece 53 is movably inserted into the locking piece groove 511 along the radial direction of the cross-section circumference of the locking piece holder 51, each locking piece 53 is connected with one of the above-mentioned supporting leaf springs 52, the supporting leaf springs 52 are inserted into the leaf spring grooves 5111, one end of each supporting leaf spring is inserted into the leaf spring hole 512, the other end of each supporting leaf spring is clamped with the locking piece 53, the supporting leaf spring 52 has elasticity, and in a free state, an pushing force can be generated on the locking piece 53, so that the locking piece 53 has a tendency to move outwards of the locking piece groove 511; the oil pipe safety valve top connector 01 is internally provided with a seating groove 011 matched with the cross-sectional profile of the positioning locking piece 53, and after the whole perforating tool penetrates into the oil pipe safety valve top connector 01, the positioning locking piece 53 can be matched with the seating groove 011, so that the whole perforating tool can be positioned at the oil pipe safety valve top connector 01.

Referring to fig. 6 to 8, the end of the expansion cylinder 25 facing away from the bump bracket 23 penetrates into the inner ring of the lock block holder 51, and the expansion cylinder 25 is slidably connected with the bump bracket 23, and when the piercing tool is in an initial state of being assembled and not jarred, a distance is provided between the end of the expansion cylinder 25 facing away from the bump bracket 23 and the positioning lock block 53 in the axial direction; the outer wall of the overlapping part of the expansion cylinder 25 and the locking piece retainer 51 is provided with a plurality of shearing grooves 251, the shearing grooves 251 are of blind hole structures, specifically, the shearing grooves 251 are provided with three shearing grooves 251 which are uniformly distributed along the circumferential direction of the outer wall of the locking piece retainer 51 at equal intervals, correspondingly, the side wall of the locking piece retainer 51 is provided with shearing screw holes 514 with the same number as that of the shearing grooves 251, each shearing groove 251 corresponds to one shearing screw hole 514, each shearing screw hole 514 and each shearing groove 251 are internally provided with one shearing screw 2510 in a penetrating way, the shearing screws 2510 are in threaded connection with the shearing screw holes 514 and are arranged in the shearing grooves 251 in a penetrating way, and the shearing screws 2510 limit the relative displacement of the expansion cylinder 25 and the locking piece retainer 51 in the axial direction.

Referring to fig. 6 to 8, the outer wall of the extension cylinder 25 is provided with guide grooves 311 with the same number as that of the supporting leaf springs 52, the guide grooves 311 are elongated sinking grooves and extend along the axial direction, each guide groove 311 corresponds to one supporting leaf spring 52, each supporting leaf spring 52 is clamped in a corresponding guide groove 311, when the extension cylinder 25 slides relative to the locking piece retainer 51, the supporting leaf springs 52 can slide in the guide grooves 311, so that the guide grooves 311 can limit the orientation of the supporting leaf springs 52, the position of the supporting leaf springs 52 is prevented from being deviated, and the elastic supporting effect of the supporting leaf springs 52 on the positioning locking pieces 53 is ensured.

Referring to fig. 6 to 8, a plurality of mounting grooves 513 are formed in the outer wall of the overlapping portion of the lock block holder 51 and the extension drum 25, specifically, three mounting grooves 513 are formed, the three mounting grooves 513 are uniformly distributed at equal intervals along the circumferential direction of the outer wall of the lock block holder 51, the mounting grooves 513 are sinking grooves, pin holes 5131 and screw holes 5132 are formed in the bottom surface of the mounting grooves 513, the pin holes 5131 and screw holes 5132 are through holes, in order to limit the sliding movement of the extension drum 25 and the whole holding assembly 2, an extension guide assembly 54 is mounted in each mounting groove 513, the extension guide assembly 54 comprises a set screw 541, a pressing plate 542 and a guide pin 543, the shape of the pressing plate 542 is matched with that of the mounting groove 513, the set screw 541 passes through the pressing plate 542 to be connected in the screw holes 5132 so as to fix the pressing plate 542, the guide pin 543 is penetrated in the pin holes 5131, and the pressing plate 542 is elastically abutted against the guide pin 543.

Referring to fig. 6 to 8, correspondingly, the outer wall of the extension tube 25 is provided with positioning grooves 252 the same as the mounting grooves 513, the positioning grooves 252 are elongated sinking grooves and extend along the axial direction, each positioning groove 252 corresponds to one mounting groove 513, and the guide pins 543 of each extension guide assembly 54 are clamped into one corresponding positioning groove 252, so that when the extension tube 25 slides in the locking piece retainer 51, the guide pins 543 can prevent the extension tube 25 from rotating around the axis, and the whole retaining assembly 2 is limited to slide only along the axial direction, and the retaining assembly 2 is prevented from rotating around the axis.

Referring to fig. 4 to 9, the orientation rod 3 is integrally of a long rod structure and comprises a rod body 31, a connecting cap 32 and a perforating cone 33, wherein the rod body 31 is arranged on the inner ring of the expansion cylinder 25, the bump bracket 23 and the connecting joint 26 in a penetrating manner, one end of the rod body 31 penetrates through the two split rings 27 and penetrates into the mounting hole 11 of the fishing head 1, the connecting cap 32 is arranged at the end part of the rod body 31 in the mounting hole 11, the connecting cap 32 is of a cylindrical structure, the connecting cap 32 and the rod body 31 are coaxially fixed, the diameter of the connecting cap 32 is larger than the diameter of the part of the rod body 31 penetrating into the mounting hole 11, the diameter of the connecting cap 32 is larger than the inner diameter of a circular ring structure formed by the two split rings 27, and the connecting cap 32 is in sliding connection with the inner wall of the mounting hole 11, so that the end part of the rod body 31 can be limited to slide only in the mounting hole 11, and the connection of the orientation rod 3 and the fishing head 1 is ensured.

Referring to fig. 6 to 9, the self-positioning assembly 6 includes a main spindle 61, a split bush 62, a spring housing 63, a torsion spring 64, a positioning block 65 and a blunderbuss head limiter 66, wherein the main spindle 61 is a long shaft of a hollow structure, an inner ring of the main spindle 61 is a main core hole 610, one end of the main spindle 61 penetrates into the lock block retainer 51 and penetrates into the interior of the expansion cylinder 25, the main spindle 61 is slidably connected with the expansion cylinder 25, and a gap for accommodating the expansion cylinder 25 and allowing the expansion cylinder 25 to enter is provided between an outer wall of the main spindle 61 and an inner wall of the lock block retainer 51; the end of the rod body 31 of the orientation rod 3, which is far away from the connecting cap 32, penetrates into the main core hole 610, a guide groove 311 and a pin hole III 312 are formed in the part, which is located in the main core hole 610, of the rod body 31 of the orientation rod 3, the guide groove 311 is a long-strip-shaped sinking groove, the guide groove 311 extends along the length direction of the rod body 31, the pin hole III 312 is a through hole, the pin hole III 312 radially penetrates through the side wall of the rod body 31, correspondingly, a guide pin hole 612 and a pin hole V611 are formed in the side wall of the main core shaft 61, the guide pin hole 612 corresponds to the guide groove 311 in the rod body 31, the pin hole V611 corresponds to the pin hole III 312 in the rod body 31, a rod guide pin 6121 is penetrated into the guide groove 311, the rod guide pin 6121 penetrates through the guide pin hole 612 and is penetrated into the guide groove 311 for preventing the rod body 31 from rotating relative to the main core shaft 61, the shear pin II 6111 is penetrated into the pin hole III 611 and the shear pin II 6111 penetrates through the pin hole III 312, correspondingly, the guide pin hole 612 and the end part of the shear pin II 6111 is located in the pin hole V611 for preventing the axial movement relative to the main core shaft 31.

Referring to fig. 6, a plurality of pin holes six 613 are formed in the outer wall of the main spindle 61, the pin holes six 613 are blind holes, a plurality of pin holes four 515 are correspondingly formed in the side wall of the lock block retainer 51, the pin holes four 515 are through holes, each pin hole six 613 corresponds to one pin hole four 515, a positioning release shear pin 6131 is arranged in each group of corresponding pin holes six 613 and pin holes four 515 in a penetrating manner, and the positioning release shear pins 6131 are used for preventing axial displacement of the main spindle 61 relative to the lock block retainer 51; the outer side of the pin hole six 613 is provided with a stop step 6132, the stop step 6132 is an annular protrusion on the outer wall of the main spindle 61, and the stop step 6132 is used for limiting the movement limit position of the expansion cylinder 25.

Referring to fig. 6 and 7, the split bush 62 is of a semi-cylindrical structure, two split bushes 62 are arranged around the outer wall of the main spindle 61 to form a cylindrical structure with two open ends, threads are arranged on the outer peripheral wall of the split bush 62 close to one end of the split bush 62, the split bush 62 penetrates into the lock block retainer 51 and is in threaded connection with the lock block retainer 51, the split bush 62 is sleeved on the outer wall of the main spindle 61, the split bush 62 and the main spindle 61 can slide relatively when being unconstrained, the opening edge of the end of the split bush 62 penetrating into the lock block retainer 51 is provided with a strike inclined plane 623, the strike inclined plane 623 is of an annular conical surface structure, accordingly, the outer wall of the main spindle 61 is provided with a strike inclined plane 618, the strike inclined plane 618 and the strike inclined plane 623 form annular conical surfaces around the outer wall of the main spindle 61, the strike inclined plane 618 and the strike inclined plane 623 correspond to each other in the axial direction, and when the main spindle 61 moves axially to enable the strike inclined plane 618 to be in contact with the strike inclined plane 623, the split bush 62 can block the position of the main spindle 61, and prevent the main spindle 61 from further falling out of the lock spindle 61 from the inner drum 25.

Referring to fig. 7 and 9, the end of the split bush 62 facing away from the hit inclined surface 623 is provided with a spring positioning hole 621, the spring positioning hole 621 is a blind hole, the torsion spring 64 is sleeved on the main core shaft 61, and one end of the torsion spring 64 penetrates into the spring positioning hole 621 and abuts against the end face of the split bush 62; the outer wall of the main spindle 61 is provided with a spring locking groove 614, the other end of the torsion spring 64 penetrates into the spring locking groove 614, a spring tightening nut 6141 is arranged in the spring locking groove 614, and the end of the torsion spring 64 is fixed in the spring locking groove 614 by the spring tightening nut 6141, so that the torsion spring 64 can exert torsion on the main spindle 61, and the main spindle 61 has a tendency to rotate around an axis relative to the split bushing 62.

Referring to fig. 7 and 9, the spring housing 63 is a cylinder having openings at both ends, the spring housing 63 is sleeved outside the main core 61, a gap is provided between the spring housing 63 and the main core 61, the torsion spring 64 is positioned at the gap between the spring housing 63 and the main core 61, in addition, the spring housing 63 is partially overlapped and sleeved outside the split bush 62, a third fastening hole 631 is provided at the overlapped portion of the spring housing 63 and the split bush 62, correspondingly, a second fastening hole 622 is provided at the overlapped portion of the split bush 62 and the spring housing 63, the second fastening hole 622 corresponds to the third fastening hole 631, a spring housing fastening screw 632 is provided in the third fastening hole 631 and the second fastening hole 622 in a penetrating manner, and the position of the spring housing 63 and the split bush 62 are locked by the spring housing fastening screw 632, so that the spring housing 63 can sufficiently protect the torsion spring 64.

Referring to fig. 9-11, a pin hole 616 is formed on a side wall of the main spindle 61 for mounting the pin assembly 7, the pin hole 616 is a round hole and penetrates into the main spindle 610, a block positioning hole 619 is also formed on a side wall of the main spindle 61, the block positioning hole 619 penetrates into the main spindle 610, the block 65 is mounted in the block positioning hole 619, the block 65 is elastically connected with the main spindle 61 through an elongated elastic plate, when the block 65 is in an unstressed free state, one part of the block 65 penetrates into the block positioning hole 619, the other part of the block 65 protrudes out of the outer wall of the main spindle 61, the main spindle 61 is provided with a limiting pin 615 at the block positioning hole 619, the limiting pin 615 is used for limiting the position of the block 65, the block 65 is prevented from being completely separated from the block positioning hole 619, and when the block 65 is extruded from the outer side of the main spindle 61, the block 65 can be completely retracted into the block positioning hole 619 and restored to the original position after the external force is released.

Referring to fig. 9 to 11, the hole punch 33 is disposed at one end of the shaft 31 facing away from the connection cap 32 and integrally disposed with the shaft 31, the hole punch 33 is disposed in the main core hole 610, the hole punch 33 is provided with a guiding conical surface 331, the guiding conical surface 331 is an inclined plane inclined with respect to the axis, the guiding conical surface 331 faces the punch head hole 616, the guiding conical surface 331 is used for cooperating with the punch head assembly 7 to form a hole punching action, in addition, a sidewall of the hole punch 33 corresponds to the bullet positioning hole 619, a position of the hole punch 33 corresponding to the bullet positioning hole 619 is provided with a yielding groove 332, and when the positioning block 65 is extruded by an external force outside the main core shaft 61, the yielding groove 332 enables the positioning block 65 to fully enter the bullet positioning groove 252.

Referring to fig. 9-11, the punch head assembly 7 includes a punch head 71, a punch head 72, a connecting shear pin 73, a fastening nut 74 and a shear pin 75, the punch head 71 is in a cylindrical structure, the diameter of the punch head 71 is matched with the diameter of a punch head hole 616, the punch head 71 is slidably connected in the punch head hole 616, the end of the punch head 71 facing the outer side of the punch head hole 616 is in an inward contracted truncated cone structure, the punch head 72 is in a cylindrical structure, the diameter of the punch head 72 is the same as the diameter of the truncated cone top surface of the punch head 71, the punch head 72 is mounted on the truncated cone top surface of the punch head 71 and is attached to the punch head 71, the surface of the punch head 72 facing the punch head 71 is provided with a plurality of connecting pin holes 721, the connecting pin holes 721 are blind holes, correspondingly, the punch head 71 is provided with connecting holes 712 the same as the connecting pin holes 721, each connecting pin hole 721 corresponds to one connecting pin hole, the connecting shear pin 73 is arranged in the connecting hole 721 in a penetrating manner, thereby realizing that the punch head 72 is connected with the punch head 72, and the punch head 72 is in a pressure-releasing state of the punch head 72 when the punch head 72 is connected with the punch head 71, and the punch head 72 is in a side wall of the punch head 72, and the punch head 72 is in a risk-down state, and the pressure-releasing structure is connected with the punch head 72; the blanking holes 713 are formed in the side walls of the punch seat 71, the blanking holes 713 are round blind holes, the connecting holes 712 penetrate into the blanking holes 713, and the cut-off connecting shear pins 73 are conveniently taken out of the blanking holes 713.

Referring to fig. 9 to 11, the end of the punch pin seat 71 facing the punch pin 33 is provided with a mating inclined surface 711, the inclination of the mating inclined surface 711 is the same as the inclination of the guide inclined surface 331 of the punch pin 33, the mating inclined surface 711 and the guide inclined surface 331 are arranged to face each other, when the whole directional rod 3 moves axially in the main core hole 610, the directional rod 3 can transmit acting force to the mating inclined surface 711 through the guide inclined surface 331 under the pushing of the punch pin 33, so that the whole punch pin seat 71 is pushed to move outwards of the punch pin hole 616 to form punching action; in addition, the punch pin seat 71 is provided with a locking hole 714 in the radial direction, the locking hole 714 penetrates through the punch pin seat 71, correspondingly, the side wall of the main mandrel 61 is provided with a punch pin positioning hole 617 in the radial direction, the punch pin positioning hole 617 penetrates into the main mandrel 610 and corresponds to the locking hole 714, the shearing pin 75 penetrates into the punch pin positioning hole 617, and part of the shearing pin 75 penetrates into the locking hole 714, the fastening nut 74 is connected with the end part of the shearing pin 75, which is far away from the punch pin seat 71, so that the whole punch pin assembly 7 is locked, and when the punch pin seat 71 is pushed by the punching cone 33, the punch pin seat 71 can shear the shearing pin 75 under the action of external force, so that the punch pin seat 71 is released and can move outwards of the punch pin hole 616.

Referring to fig. 9-11, an expansion slot 6161 is formed at the edge of the opening of the outer wall of the main core shaft 61 in the punch head hole 616, the punch head limiter 66 is installed in the expansion slot 6161, the punch head limiter 66 is in a strip-shaped plate structure and is attached to the bottom of the expansion slot 6161, the punch head limiter 66 is fixedly connected with the main core shaft 61 through a screw, one end of the punch head limiter 66 extends into the punch head hole 616, correspondingly, a limiting step 715 is arranged on the outer wall of the punch head seat 71, the limiting step 715 is in a step-shaped structure, the limiting step 715 faces the punch head limiter 66, and when the punch head seat 71 is pushed by the punch cone 33 to move outwards of the punch head hole 616, the limiting step 715 abuts against the punch head limiter 66, so that the punch head seat 71 is prevented from being completely separated from the inside of the punch head hole 616, and the punch head assembly 7 can be reused conveniently after punching.

The implementation principle of the invention is as follows:

the steel wire tool and the assembled self-positioning perforating tool of the oil pipe safety valve are connected and then put into the well, so that the self-positioning perforating tool is put into the top joint 01 of the oil pipe safety valve, and when the positioning locking piece 53 is clamped into the seating groove 011 in the top joint 01, the self-positioning perforating tool is fixed; in the process, the positioning locking piece 53 is in an activated state, the positioning locking piece 53 is pushed by the side wall of the top connector 01 and is kept in a state of being retracted into the locking piece groove 511 until the position of the positioning locking piece 53 reaches the seating groove 011, the supporting leaf spring 52 pushes the positioning locking piece 53 to be blocked into the seating groove 011 outwards towards the locking piece groove 511, and at the moment, the positions of all components of the invention are in a first state as shown in fig. 12;

When the invention is in the first state, the fishing head 1 is jarred downwards, the jarring force is transmitted to the shearing screw 2510 through the shearing pin 222 and the whole holding assembly 2, the shearing screw 2510 is sheared, the whole holding assembly 2 moves downwards along with the fishing head 1, so that the holding assembly 2 slides downwards relative to the mounting sleeve 4 until the expansion cylinder 25 abuts against the stop step 6132 of the main core shaft 61, at the moment, the expansion cylinder 25 is completely inserted into the gap between the locking block retainer 51 and the main core shaft 61, the expansion cylinder 25 forms a rigid supporting effect on the positioning locking block 53, and the perforating tool of the invention is completely seated and hung on the seating groove 011 of the top joint 01 in a rigid supporting mode, and at the moment, the perforating tool is in the second state;

when the invention is in the second state, the expansion cylinder 25 continuously jars the salvage head 1 downwards, the stop step 6132 of the main mandrel 61 is impacted, so that the main mandrel 61 can transmit acting force to the positioning release shearing pin 6131, the positioning release shearing pin 6131 is sheared, the locking between the main mandrel 61 and the locking piece retainer 51 is released, the torsion spring 64 can release elastic potential energy to drive the main mandrel 61 to rotate around the axis, the main mandrel 61 simultaneously drives the directional rod 3, the positioning block 65 and the blunderbuss head assembly 7 to rotate until the positioning block 65 enters the falling groove 02 of the top joint 01 of the oil pipe safety valve, the positioning block 65 is clamped into the falling groove 02 under the action of self elastic force to prevent the continuous rotation of the main mandrel 61, at the moment, the blunderbuss head hole 616 and the blunderbuss head assembly 7 exactly correspond to the thin wall 03 of the hydraulic piston cavity of the oil pipe safety valve, and the self-positioning of the blunderbuss head assembly 7 is realized, and the invention is in the third state at the moment;

When the positioning release shear pin 6131 is cut off, the salvage head 1 and the whole holding assembly 2 continue to move downwards under the action of the impact, the positioning lug 24 on the lug support 23 axially reaches and is inserted into the positioning groove 41 on the side wall of the mounting sleeve 4, so that the position of the holding assembly 2 is locked, then, when the invention is in the third state, the salvage head 1 is continuously impacted downwards, as the positioning lug 24 is inserted into the positioning groove 41, the relative position between the lug support 23 and the mounting sleeve 4 is locked by the positioning lug 24, the impact force born by the salvage head 1 is transmitted to the shear pin one 222, the shear pin one 222 is sheared, the salvage head 1 and the connecting joint 26 slide downwards on the inner rings of the front end retainer 21 and the lug support 23 until the bottom of the mounting hole 11 is abutted with the connecting cap 32 of the orientation rod 3, and the fourth state is achieved at the moment;

when the invention is in the fourth state, the downward jarring salvaging head 1 is continued, the jarring acting force is directly transmitted to the directional rod 3 by the salvaging head 1 and then transmitted to the second shearing pin 6111, the second shearing pin 6111 is sheared, so that the locking between the directional rod 3 and the main core shaft 61 is released, the directional rod 3 moves downward relative to the main core shaft 61 in the main core hole 610, and the guiding conical surface 331 of the punching cone 33 is contacted with the matching inclined surface 711 of the punch head seat 71; continuing to shock the fishing head 1 downwards, transmitting the shock acting force to the punch head seat 71 by the guide conical surface 331 and then to the shearing pin 75, shearing the shearing pin 75, unlocking the punch head seat 71 and the main core shaft 61, enabling the punching cone 33 of the directional rod 3 to push the whole punch head assembly 7 to move outwards of the punch head hole 616, continuing to shock the fishing head 1, and enabling the punching punch head 72 of the punch head assembly 7 to impact the thin wall 03 of the hydraulic piston cavity of the oil pipe safety valve until the thin wall 03 is broken down;

After the thin wall 03 is crashed through, the oil pipe safety valve hydraulic piston cavity is communicated with the inside of the oil pipe to form a channel, the pressure of a hydraulic medium can enter the oil pipe from the oil pipe safety valve hydraulic piston cavity, at the moment, the opening and closing of a steel wire safety valve arranged in the oil pipe safety valve after the control of the pressure of the oil pipe safety valve hydraulic piston cavity can be controlled, and the function of the oil pipe safety valve can be recovered.

The beneficial effects of the invention are as follows:

firstly, the perforating tool of the invention is put into the well by utilizing the steel wire tool, and the perforating function can be realized by continuously shocking the fishing head 1, compared with hydraulic perforating, the method has the advantages of no need of additionally providing a pressure pump to provide pressure, simpler and more convenient operation and saving operation cost, and avoids the risk of operation failure caused by damage and leakage of the sealing element of the perforating tool in a hydraulic perforating mode.

Secondly, the perforating tool can realize axial and radial bidirectional self-positioning, and the positioning is more accurate. When the oil pipe safety valve enters the top connector 01 of the oil pipe safety valve, the positioning locking piece 53 can be seated and hung in the seating groove 011, and the axial positioning of the tool can be realized after the positioning locking piece 53 is rigidly supported by the expansion cylinder 25; when the positioning release shear pin 6131 is sheared off, the torsion spring 64 resets under the action of self elasticity to drive the main mandrel 61 to rotate, and simultaneously the positioning block 65 and the blunderbuss head assembly 7 rotate along with the main mandrel, when the positioning block 65 rotates to the positioning groove 02, the positioning block 65 is clamped in the positioning groove 02 under the action of the elasticity, and at the moment, the positions of the main mandrel 61 and the blunderbuss head assembly 7 are locked, so that the corresponding direction of the blunderbuss head assembly 7 only faces the thin wall 03 of the oil pipe safety valve hydraulic piston cavity, radial positioning is realized, positioning is more accurate, and error punching is avoided. In addition, the invention can make the top joint 01 of the oil pipe safety valve used together with the oil pipe safety valve into a whole, thereby reducing the leakage points of the oil pipe safety valve.

Finally, after punching, the punch head assembly 7 with a split structure can shear the connecting shear pin 73 under the action of impact force when the whole tool is salvaged, and the punch head 72 is discarded, so that the situation that the traditional punch head 72 is difficult to separate due to blocking when punching in the pit, and the whole tool is taken out to be blocked is avoided, and the risk of scrapping the whole tool caused by local damage of the tool is reduced; in addition, the structure of the intersected pressure release holes 722 is respectively designed on the right upper end face and the side face of the punching punch head 72 which directly participates in punching, so that the risk that the hole is blocked by the punching punch head 72 with a solid structure embedded on the wall of the oil pipe safety valve is reduced, and the flexibility and the success rate of punching of a punching tool are further improved.

The above are merely embodiments of the present invention, and are not intended to limit the present invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the present invention, should be included in the scope of the claims of the present invention.

Claims

1. The self-positioning perforating tool for the underground oil pipe safety valve is characterized by comprising a fishing head (1), a holding assembly (2), a mounting sleeve (4), a locking block assembly (5) and a self-positioning assembly (6) which are connected from top to bottom, and further comprising a directional rod (3) and a punching head assembly (7);

The self-positioning assembly (6) comprises a main mandrel (61), a torsion spring (64) and a split bushing (62), wherein the split bushing (62) is connected with the locking block assembly (5), and the torsion spring (64) is connected with the split bushing (62) and the main mandrel (61); a positioning release shear pin (6131) which can be sheared when impacted is connected between the main core shaft (61) and the locking block assembly (5);

the main spindle (61) is provided with a positioning block (65), and the head assembly (7) is arranged on the main spindle (61).

2. The downhole tubing safety valve self-positioning perforating tool according to claim 1, wherein the locking block assembly (5) comprises a locking block holder (51), a supporting leaf spring (52) and a positioning locking block (53), the locking block holder (51) is connected with the mounting sleeve (4), the positioning locking block (53) is mounted on the locking block holder (51), and the supporting leaf spring (52) is connected with the locking block holder (51) and the positioning locking block (53).

3. The downhole oil pipe safety valve self-positioning perforating tool according to claim 2, characterized in that the punch head assembly (7) comprises a punch head seat (71), a punch head (72) and a connecting shear pin (73), the connecting shear pin (73) being connected between the punch head seat (71) and the punch head (72).

4. A downhole tubing safety valve self-positioning perforating tool according to claim 3, wherein the orientation rod (3) is connected with the fishing head (1), and a shearing pin II (6111) which can be sheared off when impacted is connected between the orientation rod (3) and the main mandrel (61).

5. A downhole tubing safety valve self-positioning perforating tool according to any of claims 1-4, wherein the holding assembly (2) comprises a front end holder (21), a shear block (22), a bump bracket (23) and an expansion cylinder (25) connected from top to bottom;

a first shear pin (222) which can be sheared off when being impacted is connected between the shear block (22) and the salvaging head (1), and a shear screw (2510) which can be sheared off when being impacted is connected between the expansion cylinder (25) and the locking block retainer (51).

6. The downhole oil pipe safety valve self-positioning perforation tool according to claim 5, wherein the holding assembly (2) further comprises a connecting joint (26) and a positioning lug (24), the positioning lug (24) is movably mounted on the lug support (23), and the mounting sleeve (4) is provided with a positioning groove (41); the connecting joint (26) is connected with the fishing head (1) and the positioning lug (24).

7. The downhole oil pipe safety valve self-positioning perforation tool according to claim 6, wherein the fishing head (1) is provided with a mounting hole (11), the directional rod (3) comprises a rod body (31) and a connecting cap (32), the connecting cap (32) is arranged at one end of the rod body (31), and the connecting cap (32) is arranged in the mounting hole (11);

a split ring (27) is arranged between the connecting joint (26) and the fishing head (1), and the rod body (31) penetrates through the split ring (27).

8. The downhole oil pipe safety valve self-positioning perforating tool according to claim 3 or 4, wherein the orientation rod (3) comprises a rod body (31) and a perforating cone (33), a guide cone surface (331) is arranged on the perforating cone (33), a matching inclined surface (711) is arranged on the punch seat (71), and the guide cone surface (331) and the matching inclined surface (711) are arranged in a mutually facing manner.

9. The downhole oil pipe safety valve self-positioning perforating tool according to claim 8, wherein a bullet positioning hole (619) is formed in the main mandrel (61), and the positioning block (65) is installed at the bullet positioning hole (619) and is elastically connected with the main mandrel (61);

and a yielding groove (332) is formed in the punching cone (33), and the yielding groove (332) corresponds to the bullet positioning hole (619).

10. A downhole oil pipe safety valve self-positioning perforating tool according to claim 3 or 4, characterized in that a punch head hole (616) is provided on the main mandrel (61), the punch head assembly (7) being mounted at the punch head hole (616).