Set of sliding supports for packer. RU patent 2513609.

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

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

It is known blocking a device to the packer, including installed on the stem above and below the sealing element with cones and foundations sliding elements (ES). Operation manual are included in the groove Foundation ledges and groove placed in her stretched elastic ring. The number of re more than four (RF patent for the invention №2223384, IPC EV 33/12, publ. 10.02.2004 year).

The disadvantage of this overlap device is shortness of its use at higher temperatures because the elastic rubber ring loses its original properties, due to what is the destruction of the rings, the return of sliding elements in the original position becomes impossible. Also when returning sliding elements in transport position will be pinched elastic rings intertwined pillars. Pieces of elastic rings will remain in the gap between sliding elements and translation of the packer in transport position will be difficult. In this case, sliding elements in contact with the inner wall of the casing will prevent recovery of the packer from the well.

It is known blocking a device to the packer, including the shaft, seals, guide cone, pusher, cone and installed on the cone four bottom and the top four die that their projections of type dovetail part of the guide slots cone. The lower number of dies is engaged with the pusher, and the top is associated with pins with a bottom is near. Side surfaces of dies angled toward the Central axis of the cone (copyright certificate №670720, IPC EV 33/12, publ. 30.06.1979 year).

In this overlapping device uses the lower and upper dies, the relationship between which is carried out by means of pins, which leads to the complexity of the design of the packer and the reduction of its reliability. Pins are the most fragile part of the design, so their destruction movement of the upper dies after lower dies it will not be possible, therefore, a transition of dies in transport position will be difficult. In addition, there is a possibility of premature operation of dies during the descent of the packer in the hole because the dice are kept folded under the weight of the column of pipes below the packer.

Known packer, containing stem sealing element with cones and subs. With subs hardcoded bushings with internal projections, spring loaded by means of a spring. The device has the stops on the dice that interact conical surfaces. In small packs, with the small size diameters and for cased wells die in thickened part is made with both sides on the lateral surfaces in the form of cut out from a cylindrical pipe cone (RF patent for the invention №2144129, IPC EV 33/12, publ. 10.01.2000,).

The disadvantage of this packer is the complexity of the design of the packer and reducing its reliability due to the presence of the fingers. Fingers are fragile part of the packer, their destruction will lead to the jamming of the dice, because of what the translation of the packer in transport position will be difficult. In addition, dice is between the shank and the base made of refined, which is weakening the body dies, which can lead to the scrapping die in its refined side.

Known packer, including the shaft, sealing element with cones, plates with grooves, subs and strictly related sleeves with tabs on the inner surface for engagement with the dice, the spring stops with the tabs located inside the sleeves. Interacting surfaces of dies and ledges stops are made conic and die installed on the edges of the sleeves and have fingers, and emphasises sleeves - grooves under them (SU patent for the invention №1016484, IPC EV 33/12, publ. 07.05.1983 year).

Known packer, sliding bearing is chosen as a prototype, containing stem sealing element with cones, spring-loaded stops, subs and strictly related sleeves with tabs. Packer is different in that it has a sliding bearing and liner. These supports are placed on the edges of the sleeves. Tab on the sleeves are made with inner grooves, and a shaft sliding bearings with lateral grooves and lateral projections. Shank sliding bearing is placed inside a groove-slim sleeves and is engaged with him side tabs (RF patent for the invention №2105864, IPC EV 33/12, EV 33/06, publ. 27.02.1998 year). The patent owner and the author of the patent №2105864 is IMO.

The General lack of sliding supports renowned packers is the existence of gaps between sliding bearings (dies) in the working position, resulting in large changes in pressure and high temperature may squeezing sealing element in the gap between the sliding bearings (dies), and then, when translating sliding bearings (dice) from operating position to transport position is pulling out parts of the sealing element, resulting hampered the return of sliding bearings (dice) in its original position.

The technical result of the invention is to increase the reliability of a design of sliding bearings, providing simplicity and ease of Assembly, namely the installation of sliding bearings in packer, ensuring a reliable seal the annular space between the wall of the casing columns and case packer, ensuring a guaranteed return sliding bearings in original position and as a consequence, ensuring reliable translation of the packer from operating position to transport position.

The technical result is achieved by:

- set of sliding bearings comprises bearings the first and second type, the base and the leg which is executed in the form of cut hollow cylinders, truncated at the sides with the formation of the same on both sides of flat surfaces, the external cylindrical surface of the leg and basis is made with the transition to the appropriate flat surface, this flat surface bottom sliding bearings of the first type is made with a transition to visors, and on both sides of the bottom of the sliding bearing second type has a response figured sample under canopies;

- visors sliding bearings of the first type is made of the acute-angled or trapezoidal or curved;

in response figured sample sliding bearings of the second type are made sharp, or trapezoidal, or curved;

- shank and foot sliding bearings of the first and the second type is placed inside the casing packer, external conical surface sliding bearings of the first and the second type is in interaction with the rest of the packer and the internal conic surface of the base, sliding bearings of the first and the second type is in cooperation with the cone of the packer and the internal cylindrical surface sliding bearings of the first and second type with rod packer.

The execution grounds and legs in the form of cut hollow cylinders, truncated at the sides with the formation of the same on both sides of flat surfaces, improves the design of dies and provides its ergonomics, and also simplifies the build process, namely the setting sliding bearings in packer.

The presence of peaks and response figure samples with sharp, or trapezoidal, or rounded shape, on both sides of the bottom respectively sliding bearings of the first type, and the second type reduces the gap between the casing and sliding bearings the first and second type when they are cast into position, prevents leaking seal of the packer and the introduction of mechanical impurities between sliding bearings of the first and second due to the exclusion of the education side of the cross-cutting gap between inward sliding bearings the first and second type in the working position.

Figure 1 shows the front view of sliding bearings of the first type. To clarify design figure 2 shows a 3D-model of sliding bearings of the first type from the outside. To clarify design figure 3 shows a 3D-model of the rear view sliding bearings of the first type. To clarify design figure 4 presents 3D-model of the rear view sliding bearings of the second type. To clarify design figure 5 presents 3D-model of sliding bearings of the second type from the outside.

Set of sliding bearings packer consists of the supports of the first and second type, set packer with alternating between them. Sliding bearing packer first (figure 1, figure 2, figure 3) and the second type (figure 4, figure 5) performed in the form of a symmetrical cut on the lateral surface of a cylindrical pipe. Sliding bearing packer first and second type contain shank 1, leg 2 and 3 basis (figure 1, figure 4). Shank 1 has an external conical surface 4 (figure 2, figure 5), the external cylindrical surface 5, the lateral surface of 6, 7 (figure 3, figure 4). Leg 2 has an external cylindrical surface 8 (figure 2, figure 5), the lateral surface of the 9, 10 (figure 3, figure 4). The Foundation has 3 external cylindrical surface of 11 (figure 2, figure 5), the internal conic surface of 12 (figure 3, figure 4), and the lateral surface of 13, 14. Inside the die has an internal cylindrical surface of 15, which interact with the rod of packer (figures not shown). External conical surface 4 (figure 2, figure 5) shank 1, parallel internal conic surface of 12 (figure 3, figure 4) the founding 3 made with the transition to the external cylindrical surface 8 (figure 2 figure 5) 2 legs. Leg 2 and base 3 made in the form of cut hollow cylinders, truncated at the sides with the formation of the same on both sides of flat surfaces (16, 17 and 18, 19 (figure 1, figure 5). The external cylindrical surface of 5, 11, respectively shank 1 and founding 3 performed with a transition to a flat surface, 16, 17 and 18, 19 (figure 1, figure 4). This flat surface 18, 19 bottom 3 sliding bearings of the first type is made with a transition to visors 20, 21 (figure 1, figure 2, figure 3). Visors 20, 21 can have acute or trapezoidal, or rounded shape. On both sides of the bottom 3 sliding bearings of the second type are made response figured sampling 22 (figure 4) under canopies 20, 21 (1) in the form of a sample. Response figured sampling 22 can have acute or trapezoidal, or rounded shape.

Set of sliding bearings packer works as follows.

Sliding bearings of the first and second type (figure 1, figure 4) establish stem seal between the cone and emphasis (figures not shown) with alternating between themselves, with the shank 1 and leg 2 sliding bearings of the first and the second type are inside and outside basis 3 housing (figures not shown).

Packer down in the hole on the column pipe to the required depth, together with other necessary equipment, such as anchor (figures not shown).

After reaching the required depth of the wells produce translations of the packer in the working position in a known way. Thus there is a gradual extension of sealing elements packer (figures not shown) to the diameter of the hole, accompanied by the actuation of sliding bearings of the first and second type (figure 1, figure 4).

The nomination process sliding bearings of the first and second type increases applied in a packer load is as follows. External conical surface 4 (figure 2, figure 5) shank 1, placed inside the casing packer (figures not shown), interacts with an emphasis packer (figures not shown). The internal conic surface of 12 (figure 3, figure 4) grounds 3 interacts with cone packer (figures not shown), and internal cylindrical surface 15 sliding bearings with shaft seal (figures not shown). Lateral surface of 6, 7 shank 1 and side surfaces 13, 14 founding 3 sliding bearings of the first type quit to get in touch with the relevant lateral surfaces of adjacent sliding bearings of the second type. Visors 20, 21 (2) sliding bearings of the first type out of the figure of 22 samples (figure 5) sliding bearings of the second type. There is an opening sliding bearings of the first and second type and to seal the annular space. Dimensions visors 20, 21 and figure 22 samples are selected in such a way that their disclosure was excluded education gap between sliding bearings of the first and second type.

After carrying out of necessary works produce translation packer (figures not shown) in the transport position. Sealing elements (figures not shown) take initial shape. Sliding bearings are transferred to its original position. While the lateral surface of 6, 7 (figure 3, figure 4) shank 1 and side surfaces 13, 14 founding 3 sliding bearings of the first type are again in contact with the relevant lateral surfaces of adjacent sliding bearings of the second type. Visors 20, 21 sliding bearings of the first type are in response figured sampling 22 sliding bearings of the second type. Is raspakirati.

The technical result of the invention is to increase the reliability of a design of sliding bearings, providing simplicity and ease of the Assembly sliding bearings in packer, ensuring a reliable seal the annular space between the wall of the casing and casing packer, ensuring a guaranteed return sliding bearings in original position and, as a consequence, ensuring reliable translation of the packer from operating position to transport position.

1. Set of sliding bearings packer containing sliding bearings made in the form of symmetrically cut on the lateral surface of a cylindrical pipe, the basis of having the external and internal cylindrical conical surface, the foot, shank, with the external cylindrical surface and external conical surface parallel to the internal conic surface of the base, is made with a transition to a cylindrical surface of the leg, and visors, wherein consists of the supports of the first and second type, the base and the leg which is executed in the form of a cut of a hollow cylinder, flattened on the sides to education, equal on both sides of flat surfaces, the external cylindrical surface of the leg and basis is made with the transition to the appropriate flat surface, with the flat surface of the bottom of the sliding bearing of the first type is made with the transition in visors, and on both sides of the bottom of the sliding bearing second type has a response figured sample under canopies.

2. The kit of claim 1, characterized in that visors sliding bearings of the first type is made of the acute-angled, or trapezoidal, or curved.

3. The kit of claim 1, characterized in that the return figured sample sliding bearings of the second type are made sharp, or trapezoidal, or curved.

4. Set of sliding bearings according to claim 1, characterized in that the shank and foot sliding bearings of the first and the second type is placed inside casing packer, external conical surface sliding bearings of the first and the second type is in interaction with the rest of the packer and the internal conic surface of the base, sliding bearings of the first and the second type is in cooperation with the cone of the packer and the internal cylindrical surface sliding bearings of the first and second type with the rod of the packer.