RU2513609C1 - Set of sliding supports for packer - Google Patents

Abstract

FIELD: oil and gas industry.SUBSTANCE: invention relates to oil and gas industry and can be used in packers for protection of the packer sealing element from rubber flowing into an annular gap between the casing wall and the packer body. A set of sliding supports for the packer consists of supports of the first and second type installed with alternation. Sliding supports for the packer of the first and second type are made as a cylindrical tube cut symmetrically at its lateral surfaces; they contain a liner, a leg and a base. The liner has the outer conic surface, the inner cylindrical surface and lateral surfaces. The leg has the outer cylindrical surface and lateral surfaces. The base has the outer cylindrical surface, the inner conic surface and lateral surfaces. Inside the ram there is the inner cylindrical surface. The outer conic surface of the liner parallel to the conic surface of the base is made with transition to the outer cylindrical surface of the leg. The leg and the base are made as a cut hollow cylinder truncated at sides thus forming similar flat surfaces at both sides. The outer cylindrical surface of the tailpiece and base respectively are made with transition to flat surfaces. At that the flat surfaces of the lower base part for the sliding support of the first type are made with transition into shield. At both sides of the base lower part for the sliding support of the second type there are matching shapes for shield made as a recess.EFFECT: improving reliability of sliding support structure, ensuring simple and convenient assembly at installing supports to the packer, providing reliable sealing of annular space between the casing wall and the packer body, ensuring guaranteed return of the packer sliding supports into initial position.4 cl, 5 dwg

Description

The invention relates to the oil and gas industry and can be used in packers to protect the packer sealing element from leakage of rubber into the annular gap between the casing wall and the packer body.

Known overlapping device to the packer, including mounted on the rod above and below the sealing element with cones and bases, sliding elements (RE). REs have protrusions included in the recess of the base and a groove with an elastic ring placed in it with tension. The number of REs is more than four (RF patent for the invention No. 2223384, IPC ЕВВ 33/12, publ. 02/10/2004).

The disadvantage of this overlapping device is the difficulty of its use at elevated temperatures, because the rubber of the elastic ring loses its original properties, as a result of which the ring is destroyed, and it becomes impossible to return the sliding elements to their original position. Also, when the sliding elements return to the transport position, the elastic ring will be pinched by the locking supports. The pieces of the elastic ring will remain in the gap between the sliding elements and the transfer of the packer to the transport position will be difficult. In this case, the sliding elements in contact with the inner wall of the casing, will prevent the extraction of the packer from the well.

It is known to close the device to the packer, including a barrel, a sealant, a guide cone, a pusher, a cone and four lower and four upper dies mounted on the cone, which with their dovetail protrusions enter the guide grooves of the cone. The bottom row of dies is engaged with the pusher, and the top is connected to the pins with the bottom row. The lateral surfaces of the dies are made at an angle to the central axis of the cone (copyright certificate No. 670720, IPC Е21В 33/12, publ. 06/30/1979).

This overlapping device uses the lower and upper dies, the relationship between which is carried out with the help of pins, which leads to a complication of the design of the packer and a decrease in its reliability. The pins are the most fragile part of the structure, therefore, when they are destroyed, the movement of the upper dies after the lower dies will be impossible, thus, the transition of the dies into the transport position will be difficult. In addition, there is the possibility of premature operation of the dies during the descent of the packer into the well due to the fact that the dies are kept folded under the influence of the weight of the pipe string below the packer.

Known packer containing a rod, a sealing element with cones and sub. Bushings with internal protrusions spring-loaded by means of a spring are rigidly connected to the sub. The device has stops with dies interacting with conical surfaces. In small-sized packers with small diameters and for cased wells, the dies in the thickened part are made on both sides along the lateral surfaces in the form of a cone cut from a cylindrical pipe (RF patent for the invention No. 2144129, IPC ЕВВ 33/12, publ. 10.01.2000, )

A disadvantage of the known packer is the complexity of the design of the packer and a decrease in its reliability due to the presence of fingers. Fingers are a fragile part of the packer, their destruction will entail jamming of the dies, which will make it difficult to transfer the packer to the transport position. In addition, the plate between the shank and the base is made refined, due to which there is a weakening of the body of the plate, which can lead to fracture of the plate in its refined part.

Known packer, including the barrel, the sealing element with cones, dies with grooves, sub and rigidly connected bushings with protrusions on the inner surface for engagement with the dies, spring-loaded stops with protrusions located inside the bushings. The interacting surfaces of the dies and protrusions of the stops are conical, and the dies are mounted on the protrusions of the bushings and have fingers, and the stops of the bushings have grooves for them (SU patent for invention No. 1016484, IPC ЕВВ 33/12, publ. 07.05.1983).

Known packer, sliding bearings which are selected as a prototype, containing a rod, a sealing element with cones, spring-loaded stops, sub and rigidly connected with them bushings with protrusions. The packer is characterized in that it has sliding bearings with a shank. These supports are placed on the protrusions of the sleeve. The protrusion of the sleeve is made with internal grooves, and the shank of the sliding support with side grooves and side protrusions. The shank of the sliding support is located inside the groove of the protrusion of the sleeve and is engaged with the lateral protrusions (RF patent for the invention No. 2105864, IPC ЕВВ 33/12, ЕВВ 33/06, publ. 02.27.1998). The patent holder and the author of the patent No. 2105864 is M.M.Nagumanov.

A common drawback of the sliding supports of known packers is the presence of gaps between the sliding supports (dies) in the working position, due to which, under conditions of large pressure drops and high temperatures, it is possible to extrude the sealing element into the gap between the sliding supports (dies), and then, when moving the sliding supports (dies) from the working position to the transport, the parts of the sealing element are torn out, as a result of which it is difficult to return the sliding supports (dies) to their original position.

The technical result of the claimed invention is to increase the reliability of the design of the sliding support, ensuring simplicity and ease of assembly, namely, the installation of sliding supports in the packer, ensuring reliable sealing of the annular space between the casing wall and the packer body, ensuring a guaranteed return of the sliding supports to their original position and, as a result, ensuring a reliable transfer of the packer from the working position to the transport one.

The technical result is achieved in that:

- a set of sliding supports consists of supports of the first and second type, the base and leg of which are made in the form of a cut hollow cylinder, truncated on the sides to form flat surfaces identical on both sides, the outer cylindrical surfaces of the legs and base are made with the transition to the corresponding flat surfaces, when this, the flat surfaces of the lower part of the base of the sliding support of the first type are made with a transition in the visors, and on both sides of the lower part of the base of the sliding support of the second type there is an answer s curly sample under sunshields;

- the visors of the sliding supports of the first type are made acute-angled or trapezoidal or rounded;

- reciprocal shaped samples of sliding supports of the second type are made acute-angled, or trapezoidal, or rounded;

- the shank and the leg of the sliding supports of the first and second type are located inside the packer casing, the outer conical surface of the sliding supports of the first and second type is in interaction with the packer stop, the inner conical surface of the base of the sliding supports of the first and second type is in interaction with the packer cone, and the inner the cylindrical surface of the sliding supports of the first and second type with a packer rod.

The implementation of the base and legs in the form of a cut hollow cylinder, truncated on the sides with the formation of identical flat surfaces on both sides, improves the design of the die and ensures its ergonomics, and also simplifies and facilitates the assembly process, namely the installation of sliding supports in the packer.

The presence of visors and reciprocal shaped samples having an acute-angled, or trapezoidal, or rounded shape, on both sides of the lower part of the base, respectively, of the sliding supports of the first type and the second type reduces the gap between the casing and the sliding supports of the first and second type when they are brought into working position, prevents leakage of the sealing element of the packer, as well as the ingress of mechanical impurities between the sliding supports of the first and second by eliminating the formation of a lateral through gap in inward between the sliding supports of the first and second type in the working position.

1 shows a front view of a sliding support of the first type. To explain the design, Fig. 2 shows a 3D model of a sliding support of the first type from the outside. To explain the design, Fig. 3 shows a 3D model of the rear view of the sliding support of the first type. To explain the design, Fig. 4 shows a 3D model of a rear view of a sliding support of the second type. To explain the design, figure 5 presents a 3D model of a sliding support of the second type from the outside.

The set of sliding packer supports consists of supports of the first and second type, which are installed in the packer with alternating between themselves. The sliding support of the packer of the first (figure 1, figure 2, figure 3) and the second type (figure 4, figure 5) are made in the form of a cylindrical pipe symmetrically cut along the side surfaces. The sliding support of the packer of the first and second type contain a shank 1, a leg 2 and a base 3 (Fig. 1, Fig. 4). The shank 1 has an outer conical surface 4 (figure 2, figure 5), an outer cylindrical surface 5, side surfaces 6, 7 (figure 3, figure 4). Leg 2 has an external cylindrical surface 8 (figure 2, figure 5), side surfaces 9, 10 (figure 3, figure 4). The base 3 has an outer cylindrical surface 11 (FIG. 2, FIG. 5), an inner conical surface 12 (FIG. 3, FIG. 4) and side surfaces 13, 14. Inside the ram there is an inner cylindrical surface 15 in contact with the rod packer (not shown in the figures). The outer conical surface 4 (figure 2, figure 5) of the shank 1, parallel to the inner conical surface 12 (figure 3, figure 4) of the base 3, is made with the transition to the outer cylindrical surface 8 (figure 2 of figure 5) legs 2. Leg 2 and base 3 are made in the form of a cut hollow cylinder, truncated on the sides with the formation of identical flat surfaces 16, 17 and 18, 19 on both sides (Fig. 1, Fig. 5). The outer cylindrical surface 5, 11, respectively, of the shank 1 and the base 3 are made with the transition to a flat surface 16, 17 and 18, 19 (figure 1, figure 4). In this case, the flat surfaces 18, 19 of the lower part of the base 3 of the sliding support of the first type are made with the transition to the visors 20, 21 (Fig. 1, Fig. 2, Fig. 3). Visors 20, 21 may have an acute-angled, or trapezoidal, or rounded shape. On both sides of the lower part of the base 3 of the sliding support of the second type, counter shaped samples 22 (Fig. 4) are made under the visors 20, 21 (Fig. 1) in the form of a sample. The counter shaped samples 22 may have an acute-angled, or trapezoidal, or rounded shape.

A set of sliding support packer operates as follows.

Sliding bearings of the first and second type (Fig. 1, Fig. 4) are installed on the packer rod between the cone and the stop (not shown in the figures) with alternating between each other, while the shank 1 and the leg 2 of the sliding supports of the first and second type are inside, and the base 3 is outside the casing (not shown in the figures).

The packer is lowered into the well on the pipe string to the required depth along with other necessary equipment, for example, an anchor (not shown in the figures).

After reaching the required depth of the well, the packer is transferred to the working position in a known manner. In this case, a gradual expansion of the sealing elements of the packer (not shown in the figures) to the diameter of the well, accompanied by the actuation of the sliding supports of the first and second type (Fig. 1, Fig. 4).

The process of extending the sliding supports of the first and second type as the load applied to the packer increases, proceeds as follows. The outer conical surface 4 (FIG. 2, FIG. 5) of the shank 1 located inside the packer casing (not shown in the figures) interacts with the packer stop (not shown in the figures). The inner conical surface 12 (FIG. 3, FIG. 4) of the base 3 interacts with the packer cone (not shown in the figures), and the inner cylindrical surface 15 of the sliding supports with the packer rod (not shown in the figures). The side surfaces 6, 7 of the shank 1 and the side surfaces 13, 14 of the base 3 of the sliding supports of the first type cease to be in contact with the corresponding side surfaces of adjacent sliding supports of the second type. The visors 20, 21 (FIG. 2) of the sliding supports of the first type come out of the figured samples 22 (FIG. 5) of the sliding supports of the second type. The sliding supports of the first and second types are opened and the annular space is sealed. The sizes of the visors 20, 21 and figured samples 22 are selected so that when they are opened, the formation of a gap between the sliding supports of the first and second type is excluded.

After carrying out the necessary work, the packer is transferred (not shown in the figures) to the transport position. Sealing elements (not shown in the figures) take their original form. Sliding bearings return to their original position. In this case, the side surfaces 6, 7 (FIG. 3, FIG. 4) of the shank 1 and the side surfaces 13, 14 of the base 3 of the sliding supports of the first type are again in contact with the corresponding side surfaces of adjacent sliding supports of the second type. The visors 20, 21 of the sliding supports of the first type are included in the reciprocal figured samples 22 of the sliding supports of the second type. Unpacking occurs.

The technical result of the claimed invention is to increase the reliability of the design of the sliding support, ensuring simplicity and ease of assembly when installing the sliding supports in the packer, ensuring reliable sealing of the annular space between the casing wall and the housing of the packer, ensuring a guaranteed return of the sliding supports to their original position and, as a result, ensuring reliable transfer of the packer from the working position to the transport one.

Claims (4)

1. A set of sliding packer supports, comprising sliding supports made in the form of a cylindrical pipe symmetrically cut along the side surfaces, a base having an external cylindrical and internal conical surface, a leg, a shank having an external cylindrical surface and an external conical surface parallel to the inner conical surface of the base made with the transition to the cylindrical surface of the legs, and visors, characterized in that it consists of supports of the first and second type, the base and leg to which are made in the form of a cut hollow cylinder, truncated on the sides with the formation of identical flat surfaces on both sides, the outer cylindrical surfaces of the legs and base are made with the transition to the corresponding flat surfaces, while the flat surfaces of the lower part of the base of the sliding support of the first type are made with the transition into the visors , and on both sides of the lower part of the base of the sliding support of the second type there are reciprocal figured samples for peaks. 2. The kit according to claim 1, characterized in that the visors of the sliding supports of the first type are acute-angled, or trapezoidal, or rounded. 3. The kit according to claim 1, characterized in that the reciprocal figured samples of the sliding supports of the second type are made acute-angled, or trapezoidal, or rounded. 4. The set of sliding supports according to claim 1, characterized in that the shank and the leg of the sliding supports of the first and second type are located inside the packer housing, the outer conical surface of the sliding supports of the first and second type is in cooperation with the packer stop, the inner conical surface of the base of the sliding supports the first and second type is in interaction with the cone of the packer, and the inner cylindrical surface of the sliding supports of the first and second type is with the rod of the packer.

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