RU2817926C1 - Mechanical packer with protection against impurity - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to equipment for oil and gas industry and is intended for long-term tight separation of casing string intervals during development and operation of oil, gas and injection wells, in particular for protection of mechanical packers from mechanical impurities. Disclosed is a downhole mechanical packer with an impurity protection unit, comprising a rod, in the upper part of which there is a sub, unit of protection against impurity, upper mechanical anchor consisting of upper housing, upper dies pressed by upper spring through stop, upper cone, load regulator mechanism located inside the casing connected to the middle housing, lower mechanical anchor consisting of lower housing with lower dies pressed to rod by lower spring, lower cone, planks retained on lower housing by tires by means of screws, sealing elements. At the same time the unit of protection against impurity includes a movable bushing with a collar and is placed in the upper part of the downhole mechanical packer. Collar in its upper part has a conical projection and a straight surface, which interact with the corresponding conical groove and a straight thrust surface in the lower part of the sub. In the lower part of the collar there is a projection which interacts with the inner projection of the upper housing. Movable bushing has a constant outer diameter, which corresponds to the inner diameter of the collar, and is placed on the rod between the straight thrust surface of the adapter and the upper part of the upper housing.

EFFECT: ensuring elimination of collar squeezing and pulling out during operation of mechanical packer, uniform compression of collar in volume and attachment of collar in place of engagement during operation of mechanical packer.

1 cl, 2 dwg

Description

The invention relates to equipment for the oil and gas production industry and is intended for long-term hermetic isolation of casing intervals during the development and operation of oil, gas and injection wells, in particular for the protection of mechanical packers from mechanical impurities.

A known mechanical packer contains a sub, a rod with a groove on the outer surface, sealing elements, cones placed above and below the sealing elements, installed with the ability to interact with the corresponding upper and lower radial sliding supports, spring-loaded through the upper and lower stops, located respectively in the upper and lower lower casings, spring-loaded split cone, upper mechanical anchor, consisting of an upper

housings with spring-loaded upper dies, a lower mechanical anchor, consisting of a lower housing with spring-loaded lower dies and strips, a cone connected to the lower casing, a retainer. A support sleeve with a sealing collar is installed between the sub and the upper body of the upper mechanical anchor (patent No. 191401, IPC E21B 33/129, published 08/05/2019).

The disadvantages of the known mechanical packer are uneven compression of the cuff by volume, squeezing and tearing out of the cuff, and lack of fastening of the cuff at the point of engagement during packer operation.

A well known mechanical well packer, selected as a prototype, contains a sub, a rod, sealing elements, a mechanical anchor, a load control mechanism, and a sleeve with a cuff installed between the sub and the body of the mechanical anchor. The bushing is connected to the sub and has a stepped outer surface. There is a conical transition between the upper and lower stages. The cuff is located on the lower stage of the bushing, has an internal conical surface that interacts with the conical transition of the bushing, and is installed with the ability to move to the upper stage of the bushing. The load regulator mechanism contains a locking element installed with the ability to interact with the outer protrusion of the rod (patent No. 2739175, MPK E21B 33/12, E21B 33/1208, published 12/21/2020).

The disadvantages of the known mechanical packer are uneven compression of the cuff by volume, squeezing and tearing out of the cuff, and lack of fastening of the cuff at the engagement point during packer operation.

The objective of the invention is to maintain full functioning and protect the mechanical packer from being sprinkled with mechanical impurities during its operation in the well.

The technical result is the elimination of squeezing and tearing out of the cuff during operation of a mechanical packer with a dust protection unit, uniform compression of the cuff by volume and fastening of the cuff at the point of engagement during operation of a mechanical packer with a dust protection unit.

The elimination of squeezing and tearing out of the collar during operation of a mechanical packer with an anti-sprinkling unit is achieved by the fact that the movable sleeve has a constant outer diameter, which corresponds to the internal diameter of the collar, and is placed on the rod between the straight thrust surface of the sub and the upper part of the body.

Uniform compression of the cuff throughout the entire volume and fastening of the cuff at the point of engagement during operation of a mechanical packer with a dust protection unit is achieved by the fact that the lower part of the sub has a conical groove and a straight thrust surface, which interact with the conical protrusion of the cuff and the straight surface of the cuff, respectively, in the lower part of the cuff has a protrusion that interacts with the inner protrusion of the upper body.

Figure 1 shows a diagram of a mechanical packer with a dust protection unit.

In fig. 2. shows a diagram of the unit for protecting the mechanical packer from being sprinkled with mechanical impurities during its operation in the well.

The numbers in the figures indicate: 1 - rod; 2 - sub; 3 - upper body; 4 - upper dies; 5 - upper spring; 6 - stop; 7 - upper cone; 8 - radial protrusion; 9 - load regulator mechanism; 10 - casing; 11 - middle body; 12 - sealing elements; 13 - lower cone; 14 - lower body; 15 - lower dies; 16 - lower spring; 17 - strips; 18 - tires; 19 - screws; 20 - clamp; 21 - groove; 22 - dust protection unit; 23 - cuff; 24 - conical protrusion; 25 - straight surface; 26 - protrusion; 27 - conical groove; 28 - straight thrust surface; 29 - internal protrusion; 30 - movable bushing; 31 - inner collar.

A mechanical packer with an anti-dust protection unit (Fig. 1) contains a rod 1, in the upper part of which there is a sub 2 and an upper mechanical anchor, consisting of an upper body 3, upper rams 4, pressed by an upper spring 5 through a stop 6. The upper part of the rod 1 through sub 2 it is connected to the pipe string (not shown in the figure). The upper cone 7 is located under the upper mechanical anchor. There is a radial protrusion 8 on the inner surface of the rod 1. The load regulator mechanism 9 is located inside the casing 10, connected to the middle housing 11. The load regulator mechanism 9 can be made in the form of rings or a collet mechanism, consisting of an internal collar of the collet and an external collar of the rod. Above and/or below the sealing elements 12 can be placed cones (not shown in the figure), installed with the ability to interact with the corresponding upper and lower radial sliding supports, spring-loaded through the upper and lower stops.

In the lower part of the rod 1 there is a lower mechanical anchor, consisting of a lower cone 13, a lower housing 14, lower rams 15, pressed to the rod 1 by a lower spring 16, strips 17, held on the lower housing 14 by tires 18 using screws 19. In the lower part Rod 1 has a lock 20, the end of which is located in groove 21 of rod 1.

The dust protection unit 22 (Fig. 2) of the mechanical packer is located in the upper part of the mechanical packer and includes the lower part of the sub 2, a cuff 23, a movable sleeve 30 and the upper part of the upper body 3. The cuff 23 in the upper part has a conical protrusion 24, a straight surface 25, which interact with the conical groove 27 and the straight thrust surface 28 of the sub 2, respectively, and ensure uniform compression of the cuff 23 throughout the entire volume and fastening of the cuff 23 at the point of engagement during operation of a mechanical packer with a dust protection unit. The cuff 23 in the lower part has a protrusion 26, which interacts with the inner protrusion 29 of the upper housing 3. The upper housing 3 has an internal collar 31.

The movable sleeve 30 has a constant outer diameter, which corresponds to the inner diameter of the cuff 23, and is located on the rod 1 between the straight thrust surface 28 of the sub 2 and the upper part of the upper body 3 and serves to prevent squeezing and tearing out of the cuff 23 when operating a mechanical packer with a protection unit against sprinkling, as well as limiting the movement of the upper body 3, which, when moving the mechanical packer with a sprinkling protection unit from

transport into the working position rests with the inner shoulder 31 against the movable sleeve 30.

A mechanical packer with a dust protection unit operates as follows.

A mechanical packer with a dust protection unit is lowered into the well on a pipe string to the required depth. During hoisting operations, the strips 17 of the lower mechanical anchor are constantly pressed against the walls of the production string. A mechanical packer with a dust protection unit is installed in the well without resting on the bottom in a known manner by means of axial movements of the pipe string on which it is lowered into the well.

First, the lower mechanical anchor is activated. The lower cone 13 (Fig. 1), in contact with the lower rams 15, compressing the lower spring 16, will move the lower rams 15 in the radial direction until they engage with the walls of the production string. Next, the sealing elements 12 are compressed until they come into contact with the walls of the production string, sealing the sub-packer zone. When rod 1 moves downward and a certain value of the axial compressive load created by the weight of the pipe string is triggered, the load regulator mechanism 9, made in the form of rings or a collet mechanism, is activated and the upper mechanical anchor is installed. The radial protrusion 8 of the rod 1, when the rod 1 moves downwards, will move the upper cone 7 in the radial direction until it comes into contact with the upper rams 4. With the further movement of the rod 1 downwards and the creation of a certain compressive axial load on the mechanical packer with an anti-dust protection unit, the upper rams 4 interact with an upper cone 7, move apart radially and engage with the walls of the production string. In this case, the upper dies 4 through the upper housing 3 transmit force to compress the cuff 23 (Fig. 2). The upper body 3 rests against the movable sleeve 30 with the inner flange 31 and the sealing collar 23 is compressed, blocking the annular space above the upper mechanical anchor, thereby protecting the packer

mechanical from sprinkling with mechanical impurities during operation. Thus, the mechanical packer with the dust protection unit is moved to the working position.

The mechanical packer with a dust protection unit is transferred to the transport position by tensioning the pipe string. In this case, rod 1 moves upward relative to the upper and lower mechanical anchors. As a result, the cuff 23 and the sealing elements 12 take their original shape, and the upper 4 and lower 15 rams, respectively, the upper and lower mechanical anchors, transition to the transport position.

The claimed invention makes it possible to maintain full functioning and ensure protection of the mechanical packer during its operation in the well, to eliminate squeezing and tearing out of the cuff when operating a mechanical packer with an anti-dust protection unit, to evenly compress the cuff in volume and to secure the cuff at the point of engagement when operating a mechanical packer with the unit protection against powdering.

Claims (1)

A mechanical well packer with an anti-sprinkling unit containing a rod, in the upper part of which a sub, an anti-spilling unit, an upper mechanical anchor consisting of an upper body, upper rams pressed by an upper spring through a stop, an upper cone, a load regulator mechanism, are sequentially placed in the upper part of which. located inside the casing connected to the middle body, a lower mechanical anchor consisting of a lower casing with lower dies pressed to the rod by a lower spring, a lower cone, strips held on the lower casing by tires using screws, sealing elements, and a dust protection unit includes a movable sleeve with a collar and is placed in the upper part of a mechanical well packer, characterized in that the collar in its upper part has a conical protrusion and a straight surface, which interact with the corresponding conical groove and a straight thrust surface in the lower part of the sub, in the lower part of the collar a protrusion is made that interacts with the inner protrusion of the upper body, while the movable sleeve has a constant outer diameter, which corresponds to the inner diameter of the cuff, and is placed on the rod between the straight thrust surface of the sub and the upper part of the upper body.