CN216429544U

CN216429544U - Underground fishing tool

Info

Publication number: CN216429544U
Application number: CN202122891403.8U
Authority: CN
Inventors: 鞠小亮; 宋伟; 马玉峰; 牛旭涛; 康长江; 虎鹤; 安东; 马弟邦
Original assignee: Shaanxi Ruiying International Oil And Gas Engineering Technology Service Co ltd
Current assignee: Shaanxi Ruiying International Oil And Gas Engineering Technology Service Co ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-05-03
Anticipated expiration: 2031-11-23

Abstract

The utility model belongs to the technical field of drilling and workover equipment, in particular to an underground fishing tool, which comprises a connecting rod, a male cone and a sliding sleeve; the connecting rod comprises a hollow rod, one end of the hollow rod is provided with an external thread or an internal thread for connecting with the oil rod, and the other end of the hollow rod is provided with an internal thread for connecting with the male cone; the sliding sleeve is a sleeve, the sliding sleeve is sleeved on the connecting rod and the male cone, a slide way is arranged on the sliding sleeve, and the sliding sleeve can slide on the connecting rod and the male cone along the axial direction. The utility model provides a fishing tool, its fishing public awl can be dismantled, need not whole change after public awl damages, only need trade the part that damages can, the effectual salvage cost of having practiced thrift.

Description

Underground fishing tool

Technical Field

The utility model belongs to the technical field of the well drilling and repairing equipment, concretely relates to fishing tool in pit.

Background

In the mechanical production process, due to the reasons of formation sand production, thickened oil, fluid containing wax and the like, pump blockage is easily caused, so that the rod column is broken and released, and great difficulty is brought to workover operation. The male tap is the most common fishing tool for making the inner hole, and the making and fishing can be realized through simple pressurizing and rotating. The general fishing male cone is integrated, fishing threads are easy to damage in the process of fishing and making buckles, tools need to be replaced integrally after the tools are damaged, and fishing cost is increased. In addition, when the male cone buckles the rod column, the rod column is easy to crack, and the phenomena of stoma failure and incapability of fishing are caused.

Disclosure of Invention

An object of the utility model is to provide an underground fishing tool, its simple structure, manufacturing are easy, reduce the cost of salvaging, increase the success rate of salvaging.

The utility model provides a technical scheme of above-mentioned problem is: a downhole fishing tool is characterized in that:

comprises a connecting rod, a male cone and a sliding sleeve;

the connecting rod comprises a hollow rod, one end of the hollow rod is provided with an external thread or an internal thread for connecting with the oil rod, and the other end of the hollow rod is provided with an internal thread for connecting with the male cone;

the sliding sleeve is a sleeve, the sliding sleeve is sleeved on the connecting rod and the male cone, a slide way is arranged on the sliding sleeve, and the sliding sleeve can slide on the connecting rod and the male cone along the axial direction.

Further, when the sliding sleeve slides to the lowest end, the lower end of the sliding sleeve is flush with the lower end of the male cone, or the lower end of the sliding sleeve is longer than the lower end of the male cone.

Furthermore, a limiting mechanism is arranged on the connecting rod and limits the vertical moving distance of the sliding sleeve relative to the connecting rod.

Furthermore, the slide ways are strip-shaped holes symmetrically arranged on the side wall of the sliding sleeve.

Furthermore, the number of the limiting mechanisms is two, and the two limiting mechanisms are respectively positioned on two sides of the connecting rod and respectively correspond to the strip-shaped holes in the side wall of the slideway and extend out of the strip-shaped holes.

Furthermore, the limiting mechanism is composed of two bolts, and the bolts penetrate through the corresponding strip-shaped holes and are fixed on the connecting rod through threaded connection. The bolt can be dismantled, if the sleeve damages, the change of being convenient for.

Furthermore, the limiting mechanism is formed by arranging a circular key groove on the side wall of the connecting rod, a flat key is placed in the circular key groove and then fixed through a countersunk head screw, and the flat key extends out of the strip-shaped hole. The flat key can be dismantled, and intensity is high, if the sleeve damages, is convenient for change.

Furthermore, the limiting mechanism is composed of two polished rods, round holes are formed in the connecting rod, the two polished rods penetrate through the round holes and then are welded to the connecting rod, and the two ends of each polished rod extend into the strip-shaped holes of the sliding sleeves. The mode has simple structure and convenient manufacture.

Furthermore, the inner side of the bottom end of the sliding sleeve is provided with a chamfer, so that a rod column to be salvaged can easily enter the sliding sleeve.

Furthermore, the working part of the male cone is provided with two symmetrical chip grooves.

The utility model has the advantages that:

1) the utility model provides a fishing tool, its fishing public awl can be dismantled, need not whole change after public awl damages, only need trade the part that damages can, the effectual salvage cost of having practiced thrift.

2) The utility model provides a fishing tool is equipped with the sliding sleeve on its connecting rod, and at the public awl knot in-process of making, even the situation that the post of treating salvage ftractures appears, the fishing post is treated to sliding sleeve and public awl meeting chucking, improves the success rate of salvaging.

Drawings

FIG. 1 is a schematic diagram of the downhole fishing tool of the present invention;

FIG. 2 is an exploded view of the downhole fishing tool of FIG. 1;

FIG. 3 is a first exemplary diagram of a connecting rod of the present invention;

FIG. 4 is a second exemplary illustration of the connecting rod of the present invention;

FIG. 5 is a third exemplary view of the connecting rod of the present invention;

FIG. 6 is another directional view of FIG. 5;

FIG. 7 is a schematic view of the downhole fishing tool of FIG. 1 with the sliding sleeve moved uppermost;

fig. 8 is a working state diagram of the downhole fishing tool of the present invention.

Wherein: 1-a connecting rod; 2-a male cone; 3, sliding sleeve; 4-strip-shaped holes; 5-bolt; 6-flat bond; 7-a polish rod; 8-chamfering; 9-chip removal groove; 10. a pole to be salvaged; 11. and (4) a baffle ring.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

Referring to fig. 1, 2 and 7, the present invention provides a downhole fishing tool, which comprises a connecting rod 1, a male cone 2 and a sliding sleeve 3; the connecting rod 1 comprises a hollow rod, one end of the hollow rod is provided with an external thread or an internal thread for connecting with a sucker rod or a drill rod, and the other end of the hollow rod is provided with an internal thread for connecting with the male cone 2; the sliding sleeve 3 is a sleeve, the sliding sleeve 3 is sleeved on the connecting rod 1 and the male cone 2, the sliding sleeve 3 is provided with a slideway, and the sliding sleeve 3 can slide on the connecting rod 1 and the male cone 2 along the axial direction. The inner diameter of the sliding sleeve 3 is larger than the outer diameter of the rod string 10 to be salvaged.

As a preferred embodiment of the present invention, when the sliding sleeve 3 slides to the lowest end, the lower end of the sliding sleeve 3 is flush with the lower end of the male cone 2, or the lower end of the sliding sleeve 3 is longer than the lower end of the male cone 2.

As a preferred embodiment of the present invention, the slideway is a strip-shaped hole 4 symmetrically disposed on the side wall of the sliding sleeve 3. The connecting rod 1 is provided with a limiting mechanism which limits the distance of the sliding sleeve 3 moving up and down relative to the connecting rod 1.

Specifically, stop gear's quantity is two, and two stop gear are located 1 both sides of connecting rod respectively, and respectively with the strip hole 4 on the slide lateral wall corresponding to stretch out strip hole 4.

Preferably, referring to fig. 3, the limiting mechanism is two bolts 5, the bolts 5 pass through the corresponding strip-shaped holes 4 and then are fixed on the connecting rod 1 through threaded connection, and the up-and-down movement of the sliding sleeve 3 is limited by the bolts 5. The bolt 5 can be detached, and if the sliding sleeve 3 is damaged, the sliding sleeve 3 is convenient to replace. This mode simple structure, but bolt 5's intensity is lower, and sliding sleeve 3 slides from top to bottom, causes the impact to bolt 5, and its screw is fragile.

Preferably, referring to fig. 4, the limiting mechanism is two polished rods 7, the connecting rod 1 is provided with round holes, the two polished rods 7 are welded on the connecting rod 1 after penetrating through the round holes, two ends of each polished rod 7 extend into the strip-shaped holes 4 of the sliding sleeve 3, and the sliding sleeve 3 is limited by the polished rods 7 in terms of up-and-down movement. This mode simple structure, intensity and stability are higher, but the difficult dismantlement of impaired back of sliding sleeve.

Preferably, referring to fig. 5 and 6, the limiting mechanism is a circular key groove formed in the side wall of the connecting rod 1, the flat key 6 is placed in the circular key groove and then fixed by a countersunk screw, the flat key 6 extends out of the strip-shaped hole 4, and the up-and-down movement of the sliding sleeve 3 is limited by the flat key 6. This mode, easy dismantlement, and intensity is higher.

As a preferred embodiment of the present invention, the connecting rod 1 is provided with a retaining ring 11, the retaining ring 11 can be connected to the connecting rod 1 by a screw thread, and the outer wall of the retaining ring 11 is a tapered surface. The effect of retaining ring 11 is to moving upward of sliding sleeve 3 in-process spacing, prevents to be withstood 3 bottoms of sliding sleeve in-process at the instrument whereabouts, causes the stop gear damage of connecting rod 1 outer wall, also prevents that sliding sleeve 3 and stop gear excessive, frequent striking from causing the slide damage of sliding sleeve 3. The bottom of the baffle ring 11 is the same as the outer diameter width of the sliding sleeve 3, and the bottom of the baffle ring 11 can be provided with a rubber layer for buffering the impact of the sliding sleeve 3 and avoiding damage. The bottom of the baffle ring 11 contacts with the top of the sliding sleeve 3 before the sliding sleeve 3 contacts with the limiting mechanism. The conical surface of the outer wall of the baffle ring 11 enables the baffle ring to form a chamfer angle in the lifting process of the tool, and prevents the edges and corners at the top of the sliding sleeve 3 from calculating the well wall. The baffle ring is connected by threads, and if the baffle ring 11 is damaged, the baffle ring is convenient to replace.

Preferably, referring to fig. 2, the inner side of the bottom end of the sliding sleeve 3 is provided with a chamfer 8, so that the rod string to be salvaged can easily enter the sliding sleeve 3. The working part of the male cone 2 is provided with two symmetrical chip grooves 9.

The utility model discloses a theory of operation does:

with the fishing tool connecting rod 1 of this application fix go into the well on the sucker rod under, in the public awl 2 stretches into and treats fishing rod post 10, if public awl 2 not with treat fishing rod post 10 coaxial, then the upper end of treating fishing rod post 10 can withstand sliding sleeve 3, sliding sleeve 3 shifts up along the slide, does not influence public awl 2 and moves down. The sucker rod pressurization is rotatory, drives the public awl 2 and realizes making the knot, and public awl 2 is coaxial basically with treating fishing rod post 10 this moment, and sliding sleeve 3 moves down and overlaps on treating fishing rod post 10 along the slide under self gravity, but sliding sleeve 3 inoperative this moment, treats to make the knot success back, lifts fishing tool, takes out the fish that falls. If during the thread making of the male cone 2, treat that fishing rod string 10 ftractures, its external diameter grow continues at this moment and makes the thread, treats that the external diameter on fishing rod string 10 top can contact with 3 inner walls of sliding sleeve, and the fishing rod string 10 is treated to sliding

sleeve

3 and 2 chucking of male cone this moment, lifts fishing tool, takes out the fish that falls. Checking fishing tool, the outside screw thread of 1 one end of discovery connecting rod damages, then changes connecting rod 1, and whole set of instrument can continue to be used for salvaging the junk, if the screw thread of discovery other parts damages, then only need change the part that damages and can restart to salvage, need not to change whole fishing awl.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can still adjust the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some technical features thereof. Therefore, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A downhole fishing tool is characterized in that:

comprises a connecting rod (1), a male cone (2) and a sliding sleeve (3);

the connecting rod (1) comprises a hollow rod, one end of the hollow rod is provided with an external thread or an internal thread, and the other end of the hollow rod is provided with an internal thread which is used for being connected with the male cone (2);

the sliding sleeve (3) is a sleeve, the sliding sleeve (3) is sleeved on the connecting rod (1) and the male cone (2), a slideway is arranged on the sliding sleeve (3), and the sliding sleeve (3) can slide on the connecting rod (1) and the male cone (2) along the axial direction.

2. A downhole fishing tool as claimed in claim 1, wherein:

when the sliding sleeve (3) slides to the lowest end, the lower end of the sliding sleeve (3) is flush with the lower end of the male cone (2), or the lower end of the sliding sleeve (3) is longer than the lower end of the male cone (2).

3. A downhole fishing tool as claimed in claim 2, wherein:

the slide is a strip-shaped hole (4) symmetrically arranged on the side wall of the sliding sleeve (3).

4. A downhole fishing tool as claimed in claim 3, wherein:

the limiting mechanism is arranged on the connecting rod (1) and limits the distance of the sliding sleeve (3) moving up and down relative to the connecting rod (1).

5. A downhole fishing tool as claimed in claim 4, wherein:

the number of the limiting mechanisms is two, the two limiting mechanisms are respectively positioned on two sides of the connecting rod (1), correspond to the strip-shaped holes (4) in the side wall of the slideway and extend out of the strip-shaped holes (4).

6. A downhole fishing tool as claimed in claim 5, wherein:

the limiting mechanism is composed of two bolts (5), and the bolts (5) penetrate through the corresponding strip-shaped holes (4) and are fixed on the connecting rod (1) through threaded connection.

7. A downhole fishing tool as claimed in claim 5, wherein:

the limiting mechanism is characterized in that a circular key groove is formed in the side wall of the connecting rod (1), a flat key (6) is placed in the circular key groove and then fixed through a countersunk head screw, and the flat key (6) extends out of the strip-shaped hole (4).

8. A downhole fishing tool as claimed in claim 5, wherein:

the limiting mechanism is composed of two polished rods (7), round holes are formed in the connecting rod (1), the two polished rods (7) penetrate through the round holes and then are welded to the connecting rod (1), and the two ends of each polished rod (7) stretch into the strip-shaped holes (4) of the sliding sleeves (3).

9. A downhole fishing tool as claimed in any of claims 1-8, wherein:

the inner side of the bottom end of the sliding sleeve (3) is provided with a chamfer (8), so that a rod to be salvaged can easily enter the sliding sleeve (3).

10. A downhole fishing tool as claimed in claim 9, wherein:

the working part of the male cone (2) is provided with two symmetrical chip grooves (9).