CN221942369U - A downhole tool for reducing torque and preventing wear - Google Patents

Abstract

The utility model discloses a torsion-reducing anti-wear downhole tool, which comprises an upper body and a lower body which are connected with each other, wherein an anti-wear sleeve is sleeved on the upper body, and a ball guide sleeve and balls are arranged between the upper body and the anti-wear sleeve; the outer wall of the wear-resistant sleeve is provided with a plurality of convex centralizing wings, and each centralizing wing is provided with a plurality of universal balls. The utility model converts the original plane friction of the drill rod joint in direct contact with the sleeve into the rolling friction of the universal ball, the sleeve, the ball and the upper body, thereby reducing friction and torque. The tool has the advantages of simple structure, easy replacement of related vulnerable parts, convenient use, reduced rotation torque and furthest prevention of casing wear.

Description

A downhole tool for reducing torque and preventing wear

Technical Field

The utility model relates to the technical field of petroleum and natural gas downhole operations, in particular to a downhole tool for reducing torsion and preventing wear in a large well repair.

Background Art

As oil and gas wells enter the middle and late stages of production, well conditions become more and more complex, and the probability of salvage becomes higher. In the process of conventional salvage operations, measures such as milling cement plugs, packers, and repairing fish tops are involved. Some oil and gas wells in offshore oil fields have large doglegs at the wellbore inclination position. During the milling process, the drill pipe coupling and the casing are in contact and friction at a certain point for a long time, which can easily cause the casing to be worn through by the coupling, resulting in annular pressure and sand production, which brings great safety hazards to subsequent operations. Even worse, it causes the wellbore to be connected with seawater, causing oil spills on the sea surface, and bringing extremely serious environmental accidents to the ecological environment.

In order to prevent the casing from being worn through, anti-wear tools are usually added. Currently, the commonly used anti-wear tools use plane friction inside and transverse and axial rollers on the external anti-wear sleeve, but they have the following disadvantages during use: internal plane friction, after the side force, the anti-wear sleeve is difficult to rotate, resulting in large torque and failure to fully protect the casing; the axial and radial rollers on the anti-wear sleeve collide and fall into the well during the lowering process. Therefore, it is extremely important to design a downhole anti-wear tool for reducing torque during the overhaul of the milling sleeve to prevent safety and environmental risks caused by casing wear.

Utility Model Content

In order to solve the above technical problems, the utility model provides a downhole tool for reducing torque and preventing wear, which can effectively protect the casing from being worn during the overhaul process, thereby maintaining the integrity of the wellbore.

The utility model is realized by adopting the following technical solutions.

A torque-reducing and wear-proof downhole tool comprises an upper body and a lower body connected to each other, wherein an anti-wear sleeve is sleeved on the upper body, and a ball guide sleeve and balls are arranged between the upper body and the anti-wear sleeve; a plurality of protruding straightening wings are arranged on the outer wall of the anti-wear sleeve, and a plurality of universal balls are installed on each straightening wing.

Furthermore, the outer diameter of the middle and lower parts of the upper body is reduced to form a limit platform, and the anti-wear sleeve is arranged on the reduced diameter part of the upper body, and one end of the anti-wear sleeve is against the limit platform, and the other end is against the upper end surface of the lower body.

Furthermore, the lower end of the upper body is threadedly connected to the upper end of the lower body.

Furthermore, the anti-wear sleeve is provided with four righting wings, which are distributed at equal distances along the circumference of the upper body.

Furthermore, each righting wing is provided with two universal balls, and the straight line where the two universal balls are located is parallel to the axis of the upper body.

Furthermore, the universal ball is connected to the righting wing via a thread.

The utility model achieves the following beneficial effects.

The utility model tool can better meet the requirements of reducing torque and preventing wear in the overhaul of milling sleeves and milling sleeves, can prevent sleeve wear to the maximum extent, and reduce the rotation torque. The utility model tool has a simple structure, and the related wearing parts are easy to replace, and is easy to use, reliable in performance, and strong in practicality.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the structure of the utility model;

Fig. 2 is a cross-sectional view of the utility model;

FIG. 3 is a schematic structural diagram of a universal ball transfer device of the present invention.

In the figure: 1. upper body; 2. ball guide sleeve; 3. ball; 4. anti-wear sleeve; 41. righting wing; 5. universal ball; 6. lower body.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

As shown in FIGS. 1 to 3 , a torque-reducing and wear-proof downhole tool comprises an upper body 1 , a ball guide sleeve 2 , balls 3 , an anti-wear sleeve 4 , a universal ball 5 and a lower body 6 .

The lower end of the upper body 1 is connected to the upper end of the lower body 6 by a thread, and the upper body 1 and the lower body 6 are detachably connected, and the ball guide sleeve 2, the balls 3, and the anti-wear sleeve 4 can be disassembled and taken out for replacement or maintenance.

The outer diameter of the middle and lower parts of the upper body 1 is reduced to form a limit platform, and the anti-wear sleeve 4 is sleeved on the reduced diameter part of the upper body 1, and after the upper body 1 and the lower body 6 are connected, it is clamped between the limit platform of the upper body 1 and the upper end of the lower body 6 to achieve limit fixation.

A ball guide sleeve 2 and balls 3 are provided between the anti-wear sleeve 4 and the upper body 1. The balls 3 are fixed by the ball guide sleeve 2. The ball guide sleeve 2 can evenly distribute the balls 3 between the anti-wear sleeve 4 and the upper body 1 to prevent the balls 3 from interfering with each other. During the milling process, the ball guide sleeve 2 and the balls 3 can prevent the anti-wear sleeve 4 and the body 1 from wearing each other, and change the plane friction into rolling friction.

A plurality of protruding righting wings 41 are provided on the outer wall of the anti-wear sleeve 4, and a plurality of universal balls 5 are installed on each righting wing 41. Preferably, the anti-wear sleeve 4 is provided with four righting wings 41, and they are evenly distributed along the circumference of the upper body 1; each righting wing 41 is provided with two universal balls 5, and the straight line where the two universal balls 5 are located is parallel to the axis of the upper body 1. More specifically, a mounting groove is formed inwardly on the outer wall of the righting wing 41, and the universal ball 5 is fixed in the mounting groove by a thread, and after the universal ball 5 is installed, part of the sphere of the universal ball 5 protrudes from the mounting groove. The universal ball 5 of the present application is connected to the anti-wear sleeve 4 by a thread, which can facilitate the replacement of the universal ball 5.

The protruding stabilizing wings 41 of the anti-wear sleeve 4 of the present application make the universal ball 5 directly contact with the casing wall, and transform the original plane friction between the drill rod joint and the casing into rolling friction between the universal ball 5 and the casing, thereby reducing friction and torque, and effectively reducing casing wear. At the same time, the ball guide sleeve 2 and the ball 3 are between the anti-wear sleeve 4 and the upper body 1. During operation, the ball 3 is a consumable part that contacts the anti-wear sleeve 4 and the upper body 1, and transforms the original plane friction between the drill rod joint and the casing into rolling friction between the upper body 1 and the ball 3.

Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (6)

1. A torque-reducing and wear-proof downhole tool, comprising an upper body (1) and a lower body (6) connected to each other, characterized in that: an anti-wear sleeve (4) is sleeved on the upper body (1), and a ball guide sleeve (2) and a ball (3) are arranged between the upper body (1) and the anti-wear sleeve (4); a plurality of protruding centralizing wings (41) are arranged on the outer wall of the anti-wear sleeve (4), and a plurality of universal balls (5) are installed on each centralizing wing (41). 2. A torque-reducing and wear-proof downhole tool according to claim 1, characterized in that: the outer diameter of the middle and lower parts of the upper body (1) is reduced to form a limit platform, the anti-wear sleeve (4) is sleeved on the reduced diameter part of the upper body (1), and one end of the anti-wear sleeve (4) abuts against the limit platform, and the other end abuts against the upper end surface of the lower body (6). 3. A torque-reducing and wear-proof downhole tool according to claim 1, characterized in that the lower end of the upper body (1) is threadedly connected to the upper end of the lower body (6). 4. A torque-reducing and wear-resistant downhole tool according to claim 1, characterized in that: the wear-resistant sleeve (4) is provided with four righting wings (41) which are equally spaced along the circumference of the upper body (1). 5. A torsion-reducing and anti-wear downhole tool according to claim 1, characterized in that: each righting wing (41) is provided with two universal balls (5), and the straight line where the two universal balls (5) are located is parallel to the axis of the upper body (1). 6. A torsion-reducing and anti-wear downhole tool according to claim 1, characterized in that the universal ball (5) is connected to the righting wing (41) via a thread.