Semi-open type high-capacity milling fishing cup with magnetic force

Abstract

The utility model discloses a semi-open type magnetic force high-capacity milling fishing cup which comprises a body, the body is divided into a connecting part and a working part, the connecting part is of a cylindrical structure provided with a center hole, an internal thread connected with a drill collar is arranged in the center hole, the working part is of an inwards-concave cambered surface groove structure, the upper end of the working part is provided with cambered surface magnetic steel, and the lower end of the working part is provided with a magnetic force. A fishing cup is arranged at the middle end of the working part and formed by fixedly connecting a body and an outer barrel, a bottom shell of the outer barrel inclines towards the opening end of the fishing cup, a plurality of flow guide holes are formed in the side wall of the outer barrel, and a milling part is arranged at the lower end of the working part. Through the combination form of the cambered surface magnetic steel, the fishing cup and the milling piece, the milling and fishing integration is realized, the working efficiency is improved, and meanwhile, the diversion hole is formed, so that the fishing cup forms local reverse circulation, the flowing dead zone is reduced, and the flushing and carrying capacity of drilling fluid to underground debris is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fishing for lost objects and milling in workover operations, and specifically relates to a semi-open large-capacity milling fishing cup with magnetism. Background Art

[0002] At present, in workover operations, usually milling is carried out first and then fishing, which requires two trips of drilling. Each trip of drilling takes dozens of hours, is extremely time-consuming, and the tool function structure is single. The prior art CN202531074U discloses a combined milling tool in a casing, which includes a strong magnetic pipe string, a fishing cup while drilling, and an efficient milling shoe; the upper end of the strong magnetic pipe string has an internal thread for connecting with an API casing, the lower end of the strong magnetic pipe string is threadedly connected with a fishing cup while drilling, a tubing is threadedly connected to the lower end of the fishing cup while drilling, and an efficient milling shoe is threadedly connected to the lower end of the tubing. By combining the strong magnetic pipe string, the fishing cup while drilling, and the efficient milling shoe together, milling and fishing integration is realized, and the working efficiency is improved. The problems of the prior art are as follows: the outer surface of its body is a cylindrical surface, the fishing cup space formed by the body and the outer cylinder is narrow, when the volume of the milled chips is large and there are many chips, it is difficult for the chips to enter the cup body, and at the same time the cup body will be quickly filled, so that more lost objects cannot be fished, the fishing efficiency is low, multiple fishing operations are required, the operation is complicated, and the fishing cost is high. Summary of the Invention

[0003] In order to solve the above problems, the utility model provides a semi-open large-capacity milling fishing cup with magnetism, aiming to solve the problem that the fishing cup space is narrow and too many lost objects cannot be fished, and achieve the effects of reducing the fishing cost and improving the fishing efficiency.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme: a semi-open large-capacity milling and fishing cup with magnetism, including a body, the body is divided into a connecting part and a working part, the connecting part is a cylindrical structure with a central hole opened, an internal thread for connecting with a drill collar is arranged in the central hole, the working part is an inner concave arc surface groove structure, an arc-shaped magnetic steel is arranged at the upper end of the working part, a fishing cup is arranged in the middle of the working part, the fishing cup is fixedly connected by the body and an outer cylinder, the bottom shell of the outer cylinder inclines towards the opening end of the fishing cup, and a plurality of diversion holes are opened on the side wall of the outer cylinder, and a milling part is arranged at the lower end of the working part.

[0005] The diversion holes are arranged in a rectangular array and incline towards the opening end of the fishing cup.

[0006] The body is provided with a flow channel hole, the flow channel hole is communicated with the central hole of the connecting part, and penetrates through the working part along the axial direction of the working part until the milling head of the milling part.

[0007] A cover plate is arranged on the flow channel hole, and the length of the cover plate is the same as the axial length of the working part of the body.

[0008] The arc-shaped permanent magnets are at least two pieces. Spacer rings are arranged on both sides of a single arc-shaped permanent magnet, and a permanent magnet pressing plate is arranged on the straight-edge side of the arc-shaped permanent magnet.

[0009] The milling part is a cemented carbide milling head, and the milling head part of the cemented carbide milling head is a serrated structure.

[0010] The beneficial effects of the present utility model are as follows:

[0011] 1) By setting the working part as an inner concave arc-shaped groove structure, the fishing space and fishing capacity of the fishing cup formed by fixing the working part and the outer cylinder are increased. At the same time, the working part is also provided with arc-shaped permanent magnets and milling parts. Adding arc-shaped permanent magnets enables the present utility model to fish both non-magnetic and magnetic dropped objects, and the fishing is more thorough. Adding milling parts realizes the integration of milling and fishing, improving the working efficiency.

[0012] 2) By arranging a number of diversion holes, the aperture of the diversion holes is relatively small and forms an angle with the outer cylinder. During operation, since the annulus in the upper region of the diversion holes is relatively small, the mud in this region will flow at a high speed and have a large kinetic energy, thereby adsorbing the static mud in the diversion holes and driving them to flow together, forming a local reverse circulation in the fishing cup, reducing the flow dead zone, and improving the scouring and carrying capacity of the drilling fluid for the debris at the bottom of the well, further improving the fishing efficiency. Description of the Drawings

[0013] The present utility model will be further described below in conjunction with the drawings;

[0014] Figure 1 is a schematic diagram of the present utility model;

[0015] Figure 2 is a sectional view of the present utility model;

[0016] Figure 3 is Figure 2 the A-A sectional view in

[0017] Figure 4 is a working schematic diagram of the present utility model;

[0018] In the figure: 1, body; 2, central hole; 3, arc-shaped permanent magnet; 4, fishing cup; 5, outer cylinder; 6, diversion hole; 7, flow channel hole; 8, cover plate; 9, spacer ring; 10, permanent magnet pressing plate; 11, cemented carbide milling head. Detailed Embodiments

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments.

[0020] The technical solution of the present utility model will be described in detail below with specific embodiments. These specific embodiments can be combined or replaced according to the actual situation. The same or similar concepts or processes may not be described again in some embodiments. Embodiment

[0021] As Figures 1 to 4 shown, the present utility model provides a semi-open large-capacity milling and fishing cup with magnetism, including a body 1. The body 1 is divided into a connecting part and a working part. The connecting part is a cylindrical structure with a central hole 2. An internal thread for connecting with a drill collar is arranged in the central hole 2. The working part is an inner concave arc-shaped groove structure. An arc-shaped magnet 3 is arranged at the upper end of the working part. A fishing cup 4 is arranged in the middle of the working part. The fishing cup 4 is fixedly connected by a body 1 and an outer cylinder 5. The bottom shell of the outer cylinder 5 inclines towards the opening end of the fishing cup 4. A plurality of diversion holes 6 are arranged on the side wall of the outer cylinder 5. A milling part is arranged at the lower end of the working part. By setting the working part as an inner concave arc-shaped groove structure, the fishing space and fishing capacity of the fishing cup 4 formed by fixing the working part and the outer cylinder 5 are increased. At the same time, the working part is also provided with an arc-shaped magnet 3 and a milling part. Adding the arc-shaped magnet 3 enables the present utility model to fish both non-magnetic and magnetic falling objects, and the fishing is more thorough. Adding the milling part realizes the integration of milling and fishing, improving the working efficiency.

[0022] Specifically, a flow channel hole 7 is arranged on the body 1. The flow channel hole 7 is communicated with the central hole 2 of the connecting part and penetrates through the working part along the axial direction of the working part until the milling head of the milling part. A cover plate 8 is arranged on the flow channel hole 7. The length of the cover plate 8 is the same as the axial length of the working part of the body 1. The drilling fluid flows from the central hole 2 of the connecting part along the flow channel hole 7, flushing the debris of the milling part and the bottom debris back into the fishing cup 4. Since the impact force of the drilling fluid is relatively large, in order to prevent damage to the working part of the body 1, a cover plate 8 is arranged on the flow channel hole 7.

[0023] Specifically, at least two arc-shaped magnets 3 are provided. A spacer ring 9 is arranged on both sides of a single arc-shaped magnet 3. A magnet pressing plate 10 is arranged on the straight side of the arc-shaped magnet 3. The magnetic property of the arc-shaped magnet 3 is used to adsorb magnetic falling objects, and the position is limited by the magnet pressing plate 10 and the spacer ring 9. At the same time, a plurality of arc-shaped magnets 3 are arranged and separated by the spacer ring 9 to avoid the situation of too large magnetic suction force and easy fracture.

[0024] Specifically, in order to extend the service life of the tool and achieve a better milling effect, the milling part is a cemented carbide milling head 11, and the milling head of the cemented carbide milling head 11 is a serrated structure.

[0025] Specifically, the diversion holes 6 are arranged in a rectangular array and incline towards the opening end of the fishing cup 4. By arranging a plurality of diversion holes 6, the aperture of the diversion holes 6 is relatively small and forms an included angle with the outer cylinder 5. During operation, asFigure 4 As shown, since the annulus in the upper region of the diversion hole 6 is relatively small, the mud in this region will flow at a high speed and have a large kinetic energy, thereby adsorbing the stationary mud in the diversion hole 6 and driving them to flow together, forming a local reverse circulation in the fishing cup 4, reducing the flow dead zone, improving the scouring and carrying capacity of the drilling fluid for the debris at the bottom of the well, and further improving the fishing efficiency.

[0026] In addition to the above preferred embodiments, the present utility model has other implementation manners. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope claimed by the present utility model.

Claims

1. A semi-open large-capacity milling salvage cup with magnetic force, comprising a body (1), wherein the body (1) is divided into a connecting portion and a working portion, wherein the connecting portion is a cylindrical structure with a center hole (2), wherein the center hole (2) is provided with an internal thread connected to a drill collar, wherein: The working part is an inwardly concave arc groove structure, an arc magnetic steel (3) is provided at the upper end of the working part, a scoop cup (4) is provided at the middle end of the working part, the scoop cup (4) is composed of a body (1) and an outer tube (5) fixedly connected, the bottom shell of the outer tube (5) is inclined toward the opening end of the scoop cup (4), a plurality of guide holes (6) are provided on the side wall of the outer tube (5), and a grinding and milling part is provided at the lower end of the working part.

2. A semi-open large-capacity milling salvage cup with magnetic force according to claim 1, characterized in that: The guide holes (6) are arranged in a rectangular array and are inclined towards the opening end of the scoop cup (4).

3. A semi-open large-capacity milling salvage cup with magnetic force according to claim 1, characterized in that: The body (1) is provided with a flow channel hole (7), which is in communication with the central hole (2) of the connection part and penetrates the working part axially to the milling head of the milling part.

4. A semi-open large-capacity milling salvage cup with magnetic force according to claim 3, characterized in that: A cover plate (8) is provided on the flow channel hole (7), and the length of the cover plate (8) is consistent with the axial length of the working part of the body (1).

5. A semi-open large-capacity milling salvage cup with magnetic force according to claim 1, characterized in that: The arc surface magnetic steel (3) is at least two pieces, and a spacer ring (9) is provided on both sides of a single arc surface magnetic steel (3), and a magnetic steel pressure plate (10) is provided on the straight side of the arc surface magnetic steel (3).

6. A semi-open large-capacity milling salvage cup with magnetic force according to claim 1, characterized in that: The milling component is a hard alloy milling head (11), and the milling head of the hard alloy milling head (11) is a sawtooth structure.

Images