CN216406757U

CN216406757U - Hollow milling fishing tool

Info

Publication number: CN216406757U
Application number: CN202123158066.8U
Authority: CN
Inventors: 尚斌; 尚泽元
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-16
Filing date: 2021-12-16
Publication date: 2022-04-29
Anticipated expiration: 2031-12-16

Abstract

The utility model discloses a hollow milling fishing tool, wherein an upper port of a tubular upper joint is connected with a drill rod through threads, a lower port of the upper joint is connected with a barrel through threads, a lower port of the barrel is connected with a milling shoe through threads, a conical valve seat is arranged on the upper part of the inner wall of the barrel, three through holes which incline downwards are radially and uniformly distributed on the barrel wall positioned on the upper part of the conical valve seat, dropped steel balls are matched with the conical valve seat, an annular groove is arranged on the inner wall of the lower end of the barrel, a check ring is matched and arranged through the annular groove, and vertical plates which incline inwards are uniformly distributed on the upper circumferential end surface of the check ring. The utility model has reasonable structure, can salvage the fallen objects at the bottom of the well at one time, shorten the time of salvage and milling operation, improve the efficiency of the casing packer after the well is salvaged and milled by the fallen objects in the well, reduce the metal debris mixed into the drilling fluid after milling, ensure the normal operation of the salvage tool and improve the operation safety of the salvage tool.

Description

Hollow milling fishing tool

Technical Field

The utility model belongs to a tool for fishing underground falling objects and milling casing packer bridge plugs in petroleum drilling engineering operation, and particularly relates to a hollow milling fishing tool.

Background

The following often occur in oil drilling and workover operations: the fallen objects in the well need to be salvaged, and the casing pipe bridge plug after well cementation also needs to be drilled through and then salvaged. The current method for completing the salvage is to grind the underground falling objects or the bridge plugs into fragments by using a flat-bottom grinding shoe and then salvage by using salvage tools such as a salvaging cup while drilling, a strong magnetic salvaging device and the like. The method is labor-consuming and time-consuming, and can cause some fine metal debris to be suspended in the drilling fluid, return to a wellhead and then enter the drilling equipment again, so that the drilling equipment and tools are damaged.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a hollow grinding and milling fishing tool which is reasonable in structure, can be used for fishing the fallen objects at the bottom of a well at one time, shortens the fishing and milling operation time, improves the efficiency of fishing the fallen objects in the well and milling the well-cementing casing packer bridge plug, can reduce metal chips of grinding and milling from being mixed into drilling fluid, ensures the normal operation of the fishing tool, and improves the operation safety of the fishing tool.

The purpose of the utility model is realized as follows: the utility model provides a hollow milling fishing tool, the drilling rod is being passed through threaded connection to the port on the tubulose top connection, the lower port of top connection is passing through threaded connection the barrel, pass through threaded connection milling shoes on the lower port of barrel, the conical valve seat is being set up on the upper portion of barrel inner wall, radial equipartition is setting up the through-hole of three downward sloppings on the barrel wall that is located conical valve seat upper portion, the steel ball that drops cooperatees with the conical valve seat, the annular groove is being set up on the inner wall of barrel lower extreme, the check ring is being installed through the annular groove cooperation, the equipartition is setting up the riser of leanin on the last circumference terminal surface of check ring, upper end at the riser is provided with the cutting blade of incurving.

The lower end of the upper joint is connected with the upper end of the cylinder body, the lower end of the cylinder body is connected with the upper end of the milling shoe, and the middle annular groove is arranged at the joint of the cylinder body and the milling shoe and is used for placing the check ring for preventing underground falling objects entering the cylinder from falling. The upper part of the inner cavity of the cylinder body is provided with a conical surface, the upper part of the conical surface is provided with three through holes with downward inclination of 60 degrees, drilling fluid can flow out of the cylinder body after a ball is thrown down and clamped on the conical surface to block the inner cavity channel, and the circumference of the bottom of the inner cavity of the cylinder body is provided with a groove.

The ball is thrown through the upper part of the drilling tool, falls on the conical surface in the cylinder through the upper joint, blocks the original drilling fluid circulation channel, and the upper part of the inner conical surface of the cylinder is provided with three through holes, so that the drilling fluid can flow out of the cylinder to establish new circulation after the ball falls to block the channel. The upper circumference of the inner cavity of the milling shoe is provided with a groove, the lower milling surface is a welding triangular polycrystalline cubic boron nitride tooth, the outer circumference of the sleeve milling surface is in a streamline arc shape, the bottom of the sleeve milling surface is in a convex arc shape, the bottom of the inner circumference is in a welding triangular polycrystalline cubic boron nitride tooth, and a hard alloy block is arranged above the inner circumference and is in annular welding. The lower part of the check ring is provided with a circular ring with an opening gap, the upper part of the check ring is provided with a conical cylinder with an opening gap, the blades of the check ring are arranged at intervals with two different thicknesses, and the top ends of the blades are bent inwards to form sharp edges. The lower end of the upper joint is connected with the upper end of the barrel through threads, and the lower end of the barrel is connected with the upper end of the milling shoe through threads. The ball is a solid ball.

When the device is placed on a bottom hole junk or a bridge plug to be salvaged, drilling fluid circulates for a period of time and then throws balls from a drilling tool at a wellhead, so that firstly, rock debris on a well wall enters a cylinder body to block the cylinder body to influence the salvage operation when the drilling tool is lowered; secondly, the drilling fluid changes the flowing direction. The shot stays on the conical surface at the upper part of the inner cavity of the cylinder body, and the original channel of the drilling fluid is blocked, so that the drilling fluid flows out from the three through holes at the upper part, and the circulation of the drilling fluid is reestablished.

And (3) pressurizing the bottom hole falling object or the bridge plug, and then starting milling, wherein the bottom hole falling object or the bridge plug enters the cylinder body from the cavity of the milling shoe, so that the bottom hole falling object can be fished clean, and the rock debris below the bottom hole falling object can be milled together to enter the cylinder body. And then rotating the drilling tool and applying pressure, stopping applying pressure after all the bottom hole falling objects enter the barrel, continuing rotating the drilling tool, cutting the rock debris by the cutting blade at the top of the check ring, and pressing the blades of the check ring to bend inwards due to the fact that the bottom hole falling objects and the rock debris entering the inner cavity of the barrel fall downwards under the action of gravity after the cutting, wherein the thinner blades in the check ring can reduce the inner diameter of the check ring due to the larger bending degree, and bear the weight of the bottom hole falling objects and the rock debris to ensure that the bottom hole falling objects and the rock debris cannot be leaked. For massive bottom hole falling objects, after entering the milling shoe after milling, the large bottom hole falling objects can be clamped in the milling shoe due to the extrusion of the milling surface, the increase of the stress release outer diameter after passing through the milling surface and other reasons, and cannot fall off in the lifting process. And lifting the drilling tool to finish the milling operation.

For the fishing of the bottom hole junk with special requirements, the milling shoes and the check ring can be optimized and improved properly according to the actual situation.

The utility model has reasonable structure, realizes the one-time salvage of the well bottom junk, shortens the time of salvage and milling operation, improves the efficiency of the well bottom junk salvage and milling well cementing casing packer bridge plug, reduces the metal debris of milling to be mixed into the drilling fluid, ensures the normal operation of a salvage tool, and improves the operation safety of the salvage tool.

Drawings

The present invention will be further described with reference to the accompanying drawings, in which fig. 1 is a schematic sectional structure of the present invention, fig. 2 is a schematic sectional structure of a cylinder, fig. 3 is a schematic top view structure of a stop-loop, fig. 4 is a schematic sectional structure of a-a of fig. 3, fig. 5 is a schematic sectional structure of a milling shoe, and fig. 6 is a schematic sectional structure of an upper joint.

Detailed Description

A hollow milling fishing tool is disclosed, as shown in figure 1, figure 2, figure 3, figure 4, figure 5 and figure 6, an upper port of a tubular upper joint 1 is connected with a drill rod through a thread, a lower port of the upper joint 1 is connected with a barrel body 2 through a thread, a lower port of the barrel body 2 is connected with a milling shoe 4 through a thread, a conical valve seat 7 is arranged at the upper part of the inner wall of the barrel body 2, three downward inclined through holes 6 are radially and uniformly distributed on the wall of the barrel body 2 positioned at the upper part of the conical valve seat 7, a dropped steel ball 5 is matched with the conical valve seat 7, an annular groove 11 is arranged on the inner wall at the lower end of the barrel body 2, a check ring 3 is matched and installed through the annular groove 11, inwards inclined vertical plates 9 are uniformly distributed on the upper circumferential end face of the check ring 3, and an inwards bent cutting blade 10 is arranged at the upper end of the vertical plate 9. The inclined through hole 6 has an axis forming an angle of 60 degrees with the axis of the cylinder 2. The structure of the check ring 3 is a circular ring with an opening gap 12, the upper end surface of the check ring is uniformly provided with vertical plates 9 which incline inwards to form a conical cylinder shape, and the upper end of the check ring is provided with cutting blades 10 which are radially and uniformly arranged. The uniformly distributed vertical plates 9 are thin vertical plates and thick vertical plates which are arranged at intervals in a staggered mode, wherein the thickness of each thin vertical plate is 0.1-2mm, and the thickness of each thick vertical plate is 2-5 mm. The milling shoe 4 is structured in such a way that a milling cylinder 13 is arranged at the lower end of a cylindrical sleeve, the outer wall of the milling cylinder 13 is a streamline conical surface, uniformly distributed triangular polycrystalline cubic boron nitride teeth 14 are welded on the milling surface of the outer wall in the milling cylinder 13 and on the arc surface of the lower end of the milling cylinder 13 in a welding mode, radially and uniformly distributed hard alloy blocks 15 are welded on the upper end of the inner wall of the milling cylinder 13 in a welding mode, and a circular ring groove 8 is arranged at the upper portion of the inner wall of the sleeve. The dropped steel ball 5 is a solid steel ball. The length of the hollow milling fishing tool is 1000mm-10000 mm. The outer diameter range of the milling shoe 4 is 90 mm-480 mm. The outer diameter of the milling shoe 4 is phi 95 mm, phi 105 mm, phi 115 mm, phi 149 mm, phi 165 mm, phi 216 mm, phi 244 mm, phi 311 mm or phi 444 mm.

Claims

1. The utility model provides a hollow milling fishing tool which characterized by: the upper end opening of the tubular upper joint (1) is connected with a drill rod through threads, the lower end opening of the upper joint (1) is connected with a barrel (2) through threads, milling shoes (4) are connected with the lower end opening of the barrel (2) through threads, a conical valve seat (7) is arranged on the upper portion of the inner wall of the barrel (2), three downward-inclined through holes (6) are radially and uniformly distributed on the wall of the barrel (2) on the upper portion of the conical valve seat (7), dropped steel balls (5) are matched with the conical valve seat (7), an annular groove (11) is arranged on the inner wall of the lower end of the barrel (2), a check ring (3) is arranged in a matched mode through the annular groove (11), inwards-inclined vertical plates (9) are uniformly distributed on the end face of the upper circumference of the check ring (3), and inwards-bent cutting blades (10) are arranged on the upper ends of the vertical plates (9).

2. The hollow milling fishing tool of claim 1, wherein: the included angle between the axis of the inclined through hole (6) and the axis of the cylinder body (2) is 60 degrees.

3. The hollow milling fishing tool of claim 1, wherein: the structure of the check ring (3) is a ring with an opening gap (12), the upper end surface of the check ring is uniformly provided with vertical plates (9) which incline inwards to form a conical cylinder shape, and the upper end of the check ring is provided with cutting blades (10) which are uniformly arranged in the radial direction.

4. The hollow milling fishing tool of claim 3, wherein: the uniformly distributed vertical plates (9) are thin vertical plates and thick vertical plates which are arranged at intervals in a staggered mode, wherein the thickness of each thin vertical plate is 0.1-2mm, and the thickness of each thick vertical plate is 2-5 mm.

5. The hollow milling fishing tool of claim 1, wherein: the structure of the milling shoe (4) is that a milling cylinder (13) is arranged at the lower end of a cylindrical sleeve, the outer wall of the milling cylinder (13) is a streamline conical surface, uniformly distributed triangular polycrystalline cubic boron nitride teeth (14) are welded on the milling surface of the outer wall and the arc surface of the lower end of the milling cylinder (13), radially and uniformly distributed hard alloy blocks (15) are welded on the upper end of the inner wall of the milling cylinder (13), and a circular ring groove (8) is arranged at the upper part of the inner wall of the sleeve.

6. The hollow milling fishing tool of claim 1, wherein: the dropped steel balls (5) are solid steel balls.

7. The hollow milling fishing tool of claim 1, wherein: the length of the hollow milling fishing tool is 1000mm-10000 mm.

8. The hollow milling fishing tool of claim 1, wherein: the outer diameter range of the milling shoe (4) is 90 mm-480 mm.

9. The hollow milling fishing tool of claim 1, wherein: the outer diameter of the milling shoe (4) is phi 95 mm, phi 105 mm, phi 115 mm, phi 149 mm, phi 165 mm, phi 216 mm, phi 244 mm, phi 311 mm or phi 444 mm.