RU2695734C1 - Reinforced well combined composite seal for conductor and technical pipe string - Google Patents

Abstract

FIELD: mining.SUBSTANCE: borehole combined sealant relates to a sealing downhole device used for sealing of annular gaps between a conductor and a technical pipe string installed in it when working on a shelf. Enhanced sealer comprises housing 3, pusher 7, three-stage seal 11, 12, 15, 16, including first stage – membranes 11, 12 of metal of hard alloys, second stage – double-row chevron seals 15 of polymer materials, third stage – thrust-bearing sealing ring 16 from metal of soft alloys. Membranes 11, 12 are arranged on pusher 7 to interact with conductor 2 and process pipe 1. Seals 15 are fixed on pusher 7, provide its interaction with conductor 2 and pipe 1. Ring 16 is installed in lower groove 13 of pusher 7, fixed by axis 17 and has the possibility of performing three functions. Thrust function provides the thrust of the sealant when body 3 moves relative to pusher 7 with membranes 11, 12. Support function provides support of pusher 7 with seals 15. Sealing function ensures sealing of conductor 2 and pipe 1. Ring 16 on inner edge has chamfer 18 with non-self-braking angle 19 of not less than 23 degrees, and in end part of ring 16 there is groove 21 with conical wall 23 with self-braking angle 24 not more than 5 degrees, providing the possibility of sealing conductor 2 and pipe 1.EFFECT: technical solution makes it possible to improve sealing of conductor and technical pipe, to provide for enhanced operation of seals of combined sealant and to simplify process operations.1 cl, 5 dwg

Description

The invention relates to a sealing downhole device used to seal annular gaps between the conductor and the technical pipe string installed in it when working on the shelf and containing seals of different shapes, types and materials of reinforced action.

A device for sealing annular space at the wellhead containing a cylindrical body, a centralizer of the inner casing in the form of a cylindrical sleeve with through axial channels, sealing unit, RU No. 2560452 C1, EV 33/04, 08/20/2015.

Known use in wellhead equipment for wells of elastic seals containing rubber cuffs of various shapes and sizes, RU№2435931 C1, ЕВВ 33/04, 12/10/2011; RU No. 2162929 C2, ЕВВ 33/04, 02/10/2001.

Known suspension of tubing of wellhead valves with metal-to-metal seals installed in the housing of the pipe head, consisting of a housing, seals, having annulus seals in the form of support, retaining rings and metal cuffs with conical inner and cylindrical outer surfaces, RU No. 2171358 C2, E21B 33/04, 07/27/2001.

A device is known for sealing the annulus of the mouth of an oil and gas producing well between a conductor and a production string, RU No. 2290393 C1, EV 33/04, 03/27/2005.

In known devices for sealing annular space of wells, there are no signs identical to the claimed invention.

Known combined sealant containing a housing, a pusher (force transmission device), metal and polymer seals, support ring, US 2013/0000920 A1 EV 33/035, EV 33/00, EV 33/128, 03/03/2013.

This technical solution is made as the closest analogue of the present invention.

The nearest analog sealant contains chevron seals made of different metal, which are installed by force pressure from above, are flattened, sealing the pipes.

In addition, the seal of the closest analogue, if it is necessary to lift it, cannot be removed for replacement.

In addition, the support ring of the closest analogue performs only the support function.

Other design features for the reliability of sealing during its operation in the closest analogue are not provided.

The present invention is based on the solution of the problem, which allows to increase the reliability of sealing of the conductor and technical pipe, to provide an enhanced mode of operation of the seals of the combined seal and to simplify technological operations.

The technical result of the present invention lies in the reliability of sealing annular gaps between the conductor and the technical pipe by performing a seal with three-stage seals and the design features of each stage, in providing reinforced seals due to the design of the pusher and thrust bearing ring and in simplifying installation operations during installation and lifting the seal due to the structural design of the thrust support sealing ring.

According to the invention, a reinforced combined borehole seal for a conductor and a technical pipe string comprises a housing, a pusher (force transmission device), metal and polymer seals, a support ring.

Seals have three steps.

Each stage of the seal differs in shape, size and material.

The first stage contains membranes from metal of hard alloys. The membranes are located on the pusher.

The pusher is made with conical surfaces for interaction with the housing.

A shear ring is fixed to the body. The housing is located in the upper groove of the pusher.

Membranes provide the interaction of the pusher with the conductor and the technical pipe.

Membranes seal the conductor and technical pipe.

The second stage is made of double-row chevron seals made of polymer materials.

Double row chevron seals mounted on the push rod.

Double-row chevron seals have the ability to interact with the conductor and technical pipe.

The third stage contains a thrust supporting sealing ring.

The thrust bearing sealing ring is made of soft alloy metal.

The thrust-bearing sealing ring is installed in the lower groove of the pusher and is fixed by the axis.

The axis is mounted on a thrust bearing seal ring.

The third stage has the ability to perform three functions, namely persistent, support and sealing.

The thrust function provides a seal stop when the housing is displaced relative to the pusher with membranes.

The support function provides support for the pusher with chevron seals.

The sealing function provides sealing of the conductor and technical pipe.

In addition, the thrust bearing sealing ring on the inner edge has a chamfer with a non-self-braking angle of at least 23 degrees.

The outer edge of the thrust bearing sealing ring is cylindrical.

In addition, a groove is made in the end part of the thrust bearing sealing ring.

The groove has one wall - cylindrical.

The other wall of the groove is conical with a self-braking angle of not more than 5 degrees, providing the possibility of sealing the conductor and technical pipe.

The applicant has not identified sources containing information on technical solutions identical to the present invention, which allows us to conclude that it meets the criterion of "novelty."

Due to the implementation of the distinguishing features of the invention (in conjunction with the features indicated in the restrictive part of the formula), important new properties of the object are achieved.

The performance of the sealant with three stages of seals: membranes - the first stage, chevron seals - the second stage, the thrust bearing seal ring - the third stage, increases the reliability of sealing the gap between the conductor and the technical pipe.

The design of the pusher, the location of the chevron seals on the pusher and the presence of the thrust bearing sealing ring with three functions provides an enhanced operating mode of the seals of the combined seal.

The implementation of the thrust-bearing sealing ring with non-self-braking and self-braking angles simplifies installation operations during installation and lifting of the seal and increases the reliability of operation.

The applicant is not aware of any publications that would contain information on the influence of the distinguishing features of the invention on the achieved technical result. In this regard, according to the applicant, it can be concluded that the claimed technical solution meets the criterion of "inventive step".

The invention is illustrated by drawings, which depict:

in FIG. 1 - Combined downhole reinforced sealant, cut;

in FIG. 2 - Node A in FIG. one;

in FIG. 3 - Node B in FIG. one;

in FIG. 4 - Node B in FIG. one.

in FIG. 5 - Thrust-bearing sealing ring, a cut along the axis of symmetry.

Technical pipes - 1,

Conductor - 2,

Case - 3,

shear ring (on case 3) - 4.

Lock (in case 3 for interaction with pipes 1) - 5.

The latch (in the housing 3 for interaction with the conductor 2) - 6.

Pusher - 7.

The upper groove (in the pusher 7 for installing the housing 3) - 8.

Conical surface (upper for the interaction of the pusher 7 with the housing 3) - 9,

conical surface (lower for the interaction of the pusher 7 with the housing 3) - 10.

Membrane (for the interaction of the pusher 7 with the pipes 1) - 11,

membrane (for the interaction of the pusher 7 with the conductor 2) - 12.

Lower groove (in pushrod 7) - 13.

Conical surface (pusher 7) - 14.

Chevron seals are double-row (installed on the pusher 7 for interaction with the support-bearing sealing ring 16, pipes 1 and conductor 2) - 15.

Thrust-bearing sealing ring made of soft alloy metal (installed in groove 13) - 16.

The axis (mounted on the ring 16 for fixing the pusher 7) - 17.

Chamfer (on the inner edge of the ring 16) - 18,

not self-braking angle not less than 23 degrees (chamfers 18) - 19.

The cylindrical surface (on the outer edge of the ring 16) is 20.

Groove (in the end of the ring 16) - 21,

cylindrical wall (grooves 21) - 22,

conical wall (grooves 21) - 23,

self-braking angle not more than 5 degrees (conical wall 23) - 24.

The reinforced combined downhole seal for the conductor and the technical pipe string comprises a housing 3, a pusher (force transmission device) 7, metal seals 11, 12, 16 and polymer 15, a support ring.

Seals 11 and 12, 15, 16 have three stages.

Each stage of the seals 11 and 12, 15, 16 differs in shape, size and material.

The first stage contains membranes 11, 12 of metal of hard alloys. Membranes 11, 12 are located on the pusher 7.

The pusher 7 is made with conical surfaces 9, 10 for interaction with the housing 3.

A shear ring 4 is fixed to the housing 3.

The housing 3 is located in the upper groove 8 of the pusher 7.

Membranes 11,12 provide the interaction of the pusher 7 with the conductor 2 and the technical pipe. one.

Membranes 11,12 seal the conductor 2 and the technical pipe 1.

The second stage is made of double-row chevron seals 15 made of polymer materials.

Double-row chevron seals 15 are mounted on the pusher 7.

Double-row chevron seals 15 are able to interact with the conductor 2 and the technical pipe 1.

The third stage contains a thrust supporting sealing ring 16.

The thrust bearing sealing ring 16 is made of soft alloy metal.

The thrust supporting sealing ring 16 is installed in the lower groove 13 of the pusher 7 and fixed by the axis 17.

The axis 17 is mounted on a support supporting sealing ring 16.

The third stage has the ability to perform three functions, namely persistent, support and sealing.

The thrust function provides an emphasis on the seal when the housing 3 is displaced relative to the pusher 7 with the membranes 11, 12.

The support function provides support for the pusher 7 with chevron seals 15.

The sealing function provides sealing of the conductor 2 and technical pipe 1.

In this case, the thrust bearing sealing ring 16 on the inner edge has a chamfer 18 with a non-self-braking angle 19 of at least 23 degrees.

The outer edge of the thrust bearing sealing ring 16 is made of a cylindrical shape 20.

A groove 21 is made in the end part of the support-bearing sealing ring 16.

Groove 21 has one wall - cylindrical 22.

The other wall of the groove 21 is conical 23 with a self-braking angle 24 of not more than 5 degrees, which provides the ability to seal the conductor 2 and the technical pipe 1.

Installation borehole combined seal is as follows. The sealant is lowered into the well on the tool, holding it by the housing 3.

Figure 1 shows the seal when its thrust bearing sealing ring 16 touches the conductor 2.

When the tool is subsequently lowered into the well, the housing 3, through a shear ring 4 on the pusher 7, presses it against the support-bearing sealing ring 16 with a conical surface 14, while deforming and pressing the support-support sealing ring 16 against the technical pipe 1, increasing the pressure on the conductor 2.

When the pressing force exceeds the shear force of the shear ring 4, the housing 3 will begin to move downward relative to the pusher 7 and interact with the conical surface 10, creating an axial load downward and a perpendicular load on the conductor 2, pressing the membrane 12 against the conductor 2.

Further movement of the housing 3 down allows you to start interacting with the conical surface 10 on the pusher 7, transmitting the pressure force perpendicular to the technical pipe 1 to the membrane 11.

The end of the movement of the housing 3 down will be the loss of the latches 5 and 6 into the grooves on the technical pipe 1 and the conductor 2.

The seal is installed.

Moving up the tool is disconnected from the seal and rises to the mouth.

In the process, when the fluid pressure from above is able to overcome the sealing belt from the membranes 11 and 12, chevron seals 15 will work, which will not only seal the gaps between the technical pipe 1 and the conductor 2, but also, moving down to the support-bearing sealing ring 16, will press it harder against the walls of the technical pipe 1 and conductor 2.

The inventive borehole combined seal including three stages of seals: membranes made of hard alloy metal, chevron seals made of polymeric materials and an abutment-support sealing ring made of soft alloy metal with a constructive study of its geometric shapes, is a reliable sealing device of enhanced action.

The proposed "Combined reinforced downhole compactor for the conductor and technical pipe string" can be manufactured industrially, which is confirmed by the design and technological studies of the main strength characteristics in the structural units, and testing of prototypes, studying and substantiating the operating conditions of the proposed technical solution determines according to the applicant, compliance with his criterion of "industrial applicability".

The proposed technical solution allows to increase the reliability of the sealing of the conductor and technical pipes, to provide an enhanced mode of operation of the seals of the combined seal, to simplify technological operations.

Claims (1)

Reinforced combined downhole seal for a conductor and technical pipe string, comprising a housing, a pusher (force transmission device), metal and polymer seals, a support ring, characterized in that the seals have three stages, each stage of which differs in shape, size and material, So the first stage contains membranes made of metal of hard alloys, which are located on the pusher, made with conical surfaces for interaction with the body, with a shear ring mounted on it m, located in the upper groove of the pusher, and ensure the interaction of the pusher with the conductor and the technical pipe, sealing them, the second stage is made of double-row chevron seals made of polymer materials that are mounted on the pusher and can interact with the conductor and the technical pipe, and the third stage contains thrust-bearing sealing ring made of soft alloy metal, which is installed in the lower groove of the pusher and is fixed by an axis fixed to the thrust-bearing sealing ring moreover, the third stage has the ability to perform three functions, namely, persistent, supporting and sealing, while the persistent function provides seal stop when the housing is displaced relative to the pusher with membranes, the support function provides support for the pusher with chevron seals, the sealing function ensures sealing of the conductor and technical pipe in addition, the thrust-bearing sealing ring on the inner edge has a chamfer with a non-self-braking angle of at least 23 degrees, and its outer edge is cylindrical In addition, there is a groove in the end part of the thrust support ring, in which one wall is cylindrical and the other conical with a self-braking angle of not more than 5 degrees, which makes it possible to seal the conductor and the technical pipe.

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