RU2763160C1 - Tool for installing the annular seal in a pipe column - Google Patents

Abstract

FIELD: mining industry.

SUBSTANCE: invention relates to a tool for installing an annular seal in a pipe column. The tool contains a core, a housing mounted on the core and kept from falling out by a sleeve, which interacts with the counter surface of the casing hanger by its the contact surface. In the lower part of the housing, located below the edge of the annular seal, there is at least one node of the spring-loaded finger, made with the possibility of holding the annular seal, including the finger. The axis of the finger is located in a plane perpendicular to the axis of the tool. The upper part of the annular seal installed in the tool is covered by a casing fixed to the housing in such a way that the lower edge of the casing protrudes beyond the lower edge of the housing in contact with the edge of the annular seal. The sleeve is made with external grooves on the outer surface with the possibility of moving the elements of the spring-loaded finger assembly along them and sinking or extending the finger when fixing the annular seal in the tool.

EFFECT: reliability of the annular seal attachment in the tool increases and the probability of loss of the annular seal decreases during the descent/ascent of the annular seal.

5 cl, 4 dwg

Description

Technology area

The invention relates to the oil and gas industry and can be used in the design of a tool for installing an annular seal in a pipe string in a well on the shelf.

Prior art

From the existing state of the art, there is a known assembly for attaching an annular seal and a protective sleeve (RF patent No. 2724002, publ. 06/18/2020), containing an end part of a running tool and an end part of an annular seal or a protective sleeve for connecting to each other; a collet installed on the outer surface of the upper section of the end part of the triggering tool in an annular recess and representing a body and fixing petals with bulges at the ends, an annular element having an internal threaded profile and an external protrusion mounted on the lower section of the end part of the triggering tool in the cavity formed an end part of an annular seal or a protective sleeve and a groove on the outer surface of the end part of the running tool; a sliding sleeve located in a groove made in an annular element; shear elements located in the sliding sleeve.

The disadvantage of this technical solution is the insufficient reliability of fastening the annular seal or the protective sleeve in the tool when lowering / lifting the annular seal or protective sleeve.

The essence of the invention

The problem solved by the present invention is the problem of increasing the reliability of fastening the annular seal or the protective sleeve in the tool when lowering / lifting the annular seal or the protective sleeve.

The technical result is to increase the reliability of fastening the annular seal in the tool and to reduce the likelihood of loss of the annular seal when running / lifting the annular seal.

The technical result is achieved by the fact that the fastening of the annular seal or the protective sleeve in the tool is carried out by means of spring-loaded pins located radially, the tool has a casing that limits the movement in the horizontal direction of the annular seal when lowering / lifting the annular seal.

The following is one, but not the only, embodiment of a tool for installing an annular seal.

Brief Description of Drawings

The essence of the invention is illustrated by drawings.

FIG. 1 shows a tool for installing an annular seal, general view.

FIG. 2 shows view A, a diagram of fixing the annular seal in the tool.

FIG. 3 is a view of the spring-loaded pin assembly as the annular seal is secured to the tool.

FIG. 4 is a view of the spring-loaded pin assembly as the annular seal is unlocked in the tool.

Detailed description of the invention

The tool is part of the subsea casing head system toolkit and is designed to install a metal-to-metal annular seal or a non-metallic annular seal on subsea casinghead system.

FIG. 1 shows a tool for installing an annular seal, general view.

The tool consists of:

1 - core;

2 - case;

3 - casing;

4, 20 - spring-loaded pin assembly;

5, 8 - groove;

6 - persistent surface;

7 - bushing;

9 - annular seal;

10, 15 - chamfer;

11 - shoulder;

12 - cover;

13 - spring;

14 - flat;

16 - finger body;

17 - finger;

18 - spring;

19 - stopper;

21 - shear screw.

A housing 2 is installed on the core 1 and is kept from falling out by a sleeve 7. On the housing 2, the casing 3 is attached in such a way that the lower edge of the casing 3 slightly protrudes beyond the contour of the casing 2, in the lower part of the casing 2 there are at least one assembly of the spring-loaded pin 4 and 20 , the sleeve 7 has grooves 5 and 8, into which, when it is moved, the elements of the spring-loaded pin assembly 4 and 20 move, the contact surface 6 interacts with the counter surface of the casing string suspension.

FIG. 2 shows view A, a diagram of fixing the annular seal in the tool.

When installing the annular seal 9, the tool is lowered onto the annular seal 9, the chamfer 10, made on the annular seal 9, interacts with the chamfer 15 made on the pin 17, pushing the pin 17 and the body of the pin 16 into the body of the body 2, compressing the springs 13 and 18. When further lowering of the tool due to the action of the previously compressed springs 13 and 18, the annular seal 9 is fixed in the tool in which the flat 14, made on the pin 17, interacts with the shoulder 11 made in the annular seal 9, ensuring the fixation of the annular seal 9 in the axial direction. In this case, the casing 3 interacts somewhat with the upper part of the annular seal 9 along the outer diameter.

FIG. 3 is a view of the spring-loaded pin assembly as the annular seal is secured to the tool.

The assembly of the spring-loaded pin 4 and 20 is fixed in the body 2 by a cover 12 having a thread on the outer diameter and a hole for the finger 17. Inside the cover 12, the body of the finger 16 is displaced. Inside the body of the finger 16, the finger 17 and the spring 18 are located, while the finger 17 is limited in movement along the axis of the pin by a stopper 19, located at one end in the groove on the pin 17, the other in the body of the pin 16.

FIG. 4 is a view of the spring-loaded pin assembly as the annular seal is unlocked in the tool.

The sleeve 7 with the contact surface 6 rests on the counter surface of the casing string suspension. When an axial load is applied, the shear screws 21 are destroyed, as a result of which the core 1, and then the body 2 moves downward, while the body of the pin 16 falls into the groove 5 and, due to the force of the spring 13, the body of the finger 16 moves into the groove 5 or 8, made on the bushing 7, the pin 17 moves inside the housing 2 and unlocks the annular seal 9, which is installed on the pipe string, while it becomes possible to move the tool upward without the annular seal 9.

In the RF patent No. 2724002 (publ. 06/18/2020), the annular seal is fastened with a collet installed on the outer surface of the upper section of the end part of the running tool in an annular recess and representing a body and fixing petals with bulges at the ends, the bulges are chamfered on both sides, on the inner surface of the upper section of the end part of the annular seal, an annular profile is made for engaging with the fixing tabs of the collet. Fixation of the annular seal occurs at the moment when, due to the elastic properties of the collet petals, the thickenings at the end of the petals fall into the groove on the inner surface of the annular seal, the contact of the surfaces occurs along the chamfer located on the thickening of the collet lobe. Under the influence of gravity on the thickening of the petal, a force acts perpendicular to the surface of the chamfer on the thickening of the collet petal, i.e. a force that has both horizontal and vertical components. The horizontal component acting on the thickening of the collet lobe causes the collet lobes to compress, which reduces the reliability of the annular seal attachment in the tool and with the loss of the elastic properties of the collet, or with increased dynamic loads on the annular seal at the moment when the end part of the annular seal is displaced together with the collet to stop in the sliding sleeve, there is a possibility of loss of the annular seal due to disengagement of the collet petals and the mating groove on the annular seal. In addition, there are no devices limiting the horizontal movement of the annular seal, which, in the presence of a horizontal component of the disturbing force, can lead to the annular seal moving to the edge of the tool, the load is unevenly distributed on the locking devices, increasing the likelihood of destruction of the most loaded locking device and the likelihood of disengagement of the annular seal. and fixing devices.

Unlike the technical solution presented in the patent of the Russian Federation No. 2724002 (publ. 06/18/2020), in the presented claimed technical solution under the influence of gravity acting on the annular seal 9, in the unit that implements the fastening of the annular seal 9 in the tool, there is no horizontal component of gravity acting on the attachment point, or it is very small, which increases the reliability of the attachment of the annular seal in the device and reduces the likelihood of loss of the annular seal during running-up, in addition, in the proposed technical solution, the tool contains a casing 3, covering the upper part of the annular seals 9 and limiting the horizontal movement of the elements of the annular seal 9, all this makes it possible to achieve the claimed technical result, which consists in increasing the reliability of fastening the annular seal in the tool and reducing the likelihood of loss of the annular seal when running / lifting the annular seal.

Claims (5)

1. A tool for installing an annular seal in a pipe string, containing a core, a housing mounted on the core and kept from falling out by a sleeve that interacts with the contact surface of the casing suspension seals, at least one assembly of a spring-loaded pin is placed, configured to hold an annular seal, including a pin, and the axis of the pin is located in a plane perpendicular to the axis of the tool, and the upper part of the annular seal installed in the tool is enclosed by a casing fixed to the body in this way that the lower edge of the casing protrudes beyond the lower edge of the casing in contact with the edge of the annular seal, the bushing is made with external grooves on the outer surface with the possibility of moving the elements of the spring-loaded pin assembly along them and recessing or extending the finger when fixing the annular seal iya in the instrument. 2. The tool according to claim. 1, characterized in that the finger has a flat, interacting with the counter surface of the annular seal and made in a plane perpendicular to the axis of the tool. 3. The tool according to claim 2, characterized in that the spring-loaded finger assembly consists of a cover, a finger, a finger body, a stopper, two springs, one spring with one edge abutting the cover, the other edge against the finger body, the other spring with one edge abutting into the finger, the other edge - into the body of the finger. 4. The tool according to claim. 3, characterized in that the stroke of the finger is limited by a stopper, one end installed in the body of the finger, the other end kinematically interacting with the counter surfaces of the groove made on the finger. 5. The tool according to claim 4, characterized in that the annular seal is unlocked when the body of the pin is moved into the groove on the bushing.

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