RU200883U1 - BOREHOLE SWIVEL - Google Patents

Abstract

The proposed utility model relates to the oil industry and can be used when drilling directional and horizontal wells. The downhole swivel consists of an upper and a lower mandrel, rotatably connected to each other. On the upper core without the possibility of mutual rotation, there is a support with internal slots made from below. The lower core in the upper part is rigidly connected to the body. The upper bearing is installed between the housing and the upper core, and the lower bearing is installed between the housing and the support. A piston with external slots made in its upper part is movably mounted on the upper core under the support. The piston is made with the possibility of axial movement inside the lower core without the possibility of mutual rotation. The bearings are made of ceramic material and the upper bearing is located on the outside of the tool. The technical result is achieved - increasing the reliability and service life of the downhole swivel due to the design of the bearing support. 2 wp f-ly, 2 dwg

Description

The proposed utility model relates to the oil industry and can be used when drilling directional and horizontal wells.

Known borehole swivel, which includes a barrel in the form of a shaft with a through hole, a tapered thrust protrusion mounted on the barrel with a thrust ring made of antifriction material that acts as a sliding bearing and a joint seal, at one end and an external connecting thread at the other end, with a housing in in the form of a sleeve with an internal thread at one end and an external thread at the other end, a thrust sliding bearing made of antifriction material in the form of a figured ring with internal surfaces interacting with the barrel and body, a nut with an internal thread and a tapered thrust surface on the internal shoulder for interaction with a thrust ring and connections to the housing assembly with a thrust sliding bearing and a barrel with a thrust ring installed on it, and the nut is fixed from unscrewing with the housing by locking screws and is sealed with the barrel and the housing by O-rings (according to patent RU2428556, class E21B 17/0 5, publ. 10.09.11).

The disadvantage of this solution is the impossibility of fixing the body and the shaft of the swivel to transmit rotation in the well.

Known rotary tool for use in a wellbore, which contains a tool body and a mandrel, which can move in the axial direction relative to the tool body. The tool also includes a locking member movable between a first position in which the mandrel is rotationally movable relative to the tool body and a second position in which the mandrel and the tool body are rotationally connected. The locking element is made with the ability to move between the first and second positions in response to mechanical axial force and rotational force on the mandrel (according to patent US20200141202, class E21B 31/00, E21B 17/07, E21B 43/10, E21B 17/05, publ . 07.05.20).

The disadvantage of this solution is that the bearing arrangement only takes the load in one axial direction.

As a prototype, a rotary sub is taken, which includes a first cylindrical body, including a part of the sleeve having one or more teeth, and a second cylindrical body partially located inside the part of the sleeve. The bodies are positioned to rotate relative to each other. The sub also includes a slide sleeve having one or more teeth intermeshing with the first teeth that can be axially movable between the disengaged and engaged positions, in one embodiment, due to a pressure drop across the sub. In addition, the present invention provides methods for starting the tool, in particular, for installing and hanging bushings and screens (according to patent US8191639, class E21B 23/04, publ. 05.06.12).

The disadvantage of this solution is the inability to lubricate the bearing, which can lead to overheating and destruction. Also, the design and materials of the bearing arrangement are not disclosed.

The technical result to be achieved by the proposed utility model is to increase the reliability and service life of the downhole swivel due to the design of the bearing support.

The specified technical result is achieved in that the downhole swivel consists of upper and lower cores connected to each other for rotation, on the upper core without the possibility of mutual rotation there is a support with internal slots made from below, the lower core in the upper part is rigidly connected to the body, between the body and the upper core is installed the upper bearing, and between the housing and the support - the lower bearing, on the upper core under the support is movably mounted a piston with external splines made in its upper part, the piston is made with the possibility of axial movement inside the lower core without the possibility of mutual rotation, and differs in that that the bearings are made of ceramic material and the upper bearing is located on the outside of the tool.

In addition, the piston can be secured with shear pins.

In addition, radial grooves can be made on the bearing bushes.

The proposed utility model is illustrated by the following drawings:

FIG. 1 - downhole swivel, the upper and lower cores are not fixed;

FIG. 2 - downhole swivel, upper and lower cores are fixed.

The downhole swivel (Fig. 1) consists of an upper core 1 and a lower core 2, connected to each other for rotation. On the upper core 1 there is a support 3 with internal slots made from below 4. The support 3 is fixed against rotation on the upper core 1 by a key 5. The lower core 2 in the upper part is rigidly connected to the housing 6. Between the housing 6 and the upper core 1 there is an upper bearing 7, consisting of bushings 8 and 9, fastened with bolts 10. Between the housing 6 and the support 3 is a lower bearing 11, consisting of bushings 12 and 13, fastened with bolts 14. On the upper core 1 under the support 3, a piston 15 is movably mounted with external splines 16. The piston 15 is made with the possibility of axial movement inside the lower core 2 and is fixed against rotation by keys 17.

Piston 15 is fixed with shear pins 18.

On the bushings 8, 9 of the bearing 7 and on the bushings 12, 13 of the bearing 10, radial grooves 19 and 20 are made, respectively.

Application.

In horizontal wells, the distance reach of the pipe weight is often insufficient to overcome the lateral loading frictional forces and obtain a bottom completion assembly at the total depth. To facilitate driving the assembly to the overall depth, it is necessary to overcome the frictional stress by rotating. But it is often impossible or undesirable to rotate a bottom-ended assembly to avoid damaging complex and delicate instruments.

The swivel is used for running the drill string into directional and horizontal wells when running requires that the lower part under the swivel remains stationary, and the upper part rotates to ensure lowering.

During running, the drill pipes connected to the upper swivel core 1 have the ability to rotate, while minimal or zero torque will be transmitted to the lower core 2 with the assembly connected to it.

To activate the rotation of the lower assembly, it is necessary to move the piston 15 upward, creating an excess pressure under it, while the pins 18 are sheared off. The outer splines 16 of the piston 15 engage with the inner splines 4 of the support 3. This ensures a rigid connection between the upper core 1 and the lower core 2, as a result of which it becomes possible to transmit torque to the lower assembly.

Ceramic bearings ensure reliable operation. Advantages of ceramic bearing materials:

low coefficient of friction;

high mechanical compressive strength up to 1990 MPa;

wear / abrasion resistance - Rockwell hardness 45H out of 82;

corrosion resistance;

high strength and impact resistance;

low thermal conductivity, can withstand temperatures up to 800 ° C

Placing the main bearing on the outside of the swivel allows the drilling fluids to lubricate and cool the bearing during operation. Radial grooves 19, 20, made in bushings 8, 9, 12, 13, improve the circulation of the solution through the bearings. This significantly increases bearing life, allowing longer continuous swivel operation.

Thus, the solutions used in the utility model increase the operational reliability and service life of the downhole swivel and contribute to the achievement of the technical result.

Claims (3)

1. Downhole swivel, consisting of upper and lower cores connected to each other with the possibility of rotation, on the upper core without the possibility of mutual rotation, a support with internal slots made from below is installed, the lower core in the upper part is rigidly connected to the body, between the body and the upper core is installed the upper bearing, and between the housing and the support - the lower bearing, a piston with external splines made in its upper part is movably mounted on the upper core under the support, the piston is made with the possibility of axial movement inside the lower core without the possibility of mutual rotation, and characterized in that the bearings are made made of ceramic material, and the upper bearing is located on the outside of the swivel. 2. A downhole swivel according to claim 1, characterized in that the piston is fixed with shear pins. 3. A downhole swivel according to claim 1, characterized in that radial grooves are made on the bearing bushings.

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