SU1502807A1 - Packer - Google Patents

Abstract

The invention relates to the oil and gas industry and improves the reliability of operation by facilitating the removal of the packer with significant pressure drops. On the hollow stem (W) 4 with the pipe 5, the sealing element 3 and the sliding upper 1 and lower 2 supporting units interacting with it are installed. The latter interact respectively with the upper and lower annular protrusions 6, made on W 4. The spline connection W 4 is connected with the possibility of limited axial movement with the upper and lower subs 7 and 8. The latter are rigidly connected with 6 clips installed on W 4 and interacting with the protrusions 9 with radial grooves 12, in which the sectors 13 of the support ring (K) are located 17. At the outer end of the sectors 13, the projections 15 are made in the form of overlapping plates 16. The surfaces of the clips 9 and the sectors 13 of the nodes 1 and 2 and Procedure them response surface member 3 are respectively in the form of concave and convex torus surfaces with a smooth transition into the cylindrical surface of the end portion of element 3 and its middle part. The bearing surfaces of the yoke 9 are formed by a concave torus surface, and the interacting portions of the sectors 13 have a counter surface. In the middle part W 4, additional protrusions 18 are made with the possibility of interacting with K 17 nodes 1 and 2. To remove the packer, a tensile force is applied to the upper sub 7. In this case, one of the clips of the lower 9 moves upwards relative to the upper K 17, the sectors 13 slide along the slots of the holder. As a result, the upper support is removed, and preloading of the upper part of element 3 to the wall of the column is stopped. Subsequent movement of the upper sub 7 is driven by an Ø 4 with nozzle 5, which acts on the lower K 17 and sectors 13. As a result, element 3 is forced to shift and sectors 13 move, and the packer is removed. 1 hp f-ly, 5 ill.

Description

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Fju-immobilization (M has a axial movement with upper and lower transistors 7 and 8, the latter are rigidly connected to those installed on 111 4 and in projections with 6 collars 9 with radial grooves 12, in which the 13 oiTopHoro sectors of the ring are located ( K) 17. At the outer end of the sectors 13 are made — the 15 are pressed in the blade of the overlapping plates 16. The surfaces of the sleeves 9 and the sectors 13 of the nodes 1 and 2 and the associated response surfaces of the element 3 are made respectively in the shape of a concave and convex torus surfaces with floating-} 1st per . In the course of their cylindrical surface of the end portion of element 3 and its middle portion Ono nye surface yoke 9 are formed concave torus surface, and; 1aimodeystv thin portions with them

ceKTdiuui 13 have a counter surface. In the middle part of W 4, additional protrusions 18 are made with the ability to interact with K 17 nodes 1 and 2. To remove the packer, a tensile force is applied to the upper sub 7, while one of the clips (lower) 9 moves upward relative to the upper K 17, sectors 13 slides along the grooves of the circumference. As a result, the upper support is removed, and the preload of the upper part of the element 3 to the wall of the column is stopped. Subsequent movement of the upper sub 7 is driven by an Ø 4 with nozzle 5, which acts on the lower K 17 and sectors 13. As a result, element 3 is forced to shift and sectors 13 move, and the packer is removed. 1 hp f-ly, 5 ill.

The invention relates to the oil and gas industry, namely, equipment for sealing the annulus during the opening of formations and testing of wells.

The purpose of the invention is to increase the reliability of the packer due to the ease of its removal with significant pressure drops.

Figure 1 shows the packer in the transport (initial) position; Fig. 2 is a section A-A in Fig. 1 (the sealing element is not conventionally shown); on fig.Z - section bb in figure 2 (the image is deployed along an arc); figure 4 shows the packer in the working position; figure 5 shows the node I in figure 4.

The packer (Fig. 1) includes upper 1 and lower 2 support units, a sealing element 3, a stem 4 with a nozzle 5, having protrusions 6 and connected by a pit joint with limited axial movement with an upper sub 7. Similarly, the stem 4 through pipe 5 is connected to the lower one by transferring NIKOM 8, Subs 7 h 8 rigidly cocjuintMiLi installed on the stem D and pipe 5 and B) and equipped with BiiicTViuiMH 6 clips 9 using

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nuts 10. The surfaces 11 of the sleeves 9 which are in contact with the sealing element 3 are made in the form of a concave torus surface and have radial grooves 12 of constant section, in which the sectors 13 are located, repeating in their middle part the shape of the bearing surfaces 14 of these grooves, and it is the shape of the part of the ring with a radius equal to the radius of the forming circle of the torus surface. At the outer end of the sectors 13 there are projections 15 extending beyond the torus surface. The protrusions 15 are arranged perpendicular to the packer axis of the plate 16, directed alternately upwards or downwards, and the adjacent protrusions 15 are in contact with each other along the surfaces of the plates 16, forming a sliding solid ring support. The inner ends of the sectors 13 are movably connected to the support rings 17 by means of grooves made therein in contact with the inner shoulders of the support rings 17. The connection provides for gaps that provide partial rotation of the sectors 13 relative to the rings 17, and so: their radial offset. The axis of rotation of the sectors 13 is located in the plane of symmetry of the torus surface, having the possibility of displacement relative to it by a certain amount 1/2 up and down (Fig.5). The support rings 17 are installed with the possibility of interaction with the protrusions 18 of the stem 4 and the nozzle 5 (figure 5) and can be displaced relative to the sleeves 9 by the value 1. The sealing element 3 covers in its middle part the stem 4, and in the end sections contact with the sleeves 9, support rings 17 by sectors 13 and their protrusions 15; The inner surface 19 of the end sections 20 of the sealing element 3 (FIG. 5) is formed by a convex torus surface passing into a cylindrical one. The outer surface of the sealing element 3 is cylindrical and, in the extended position, forms an annular gap with the wall of the casing string.

Packer works as follows.

The packer in the layout with the lower-lying bark is descended on the tubing to the desired depth, and is produced for coring. The packer allows the transmission of a cool 1DI moment by the downstream device in the stretched and compressed positions. A compressive load on the weight of the pipes is then transferred to the packer. In this position, the lower sub 8 together with the yoke 9 (lower) is fixed relative to the walls of the casing 21, and the lower support ring 17 under the action of the sealing element 3 is displaced downward by 1, moving the sectors 13 that move along the grooves on the tore portion of the yoke 9. In this case, the inner end of the sectors moves along an arc by an amount equal to the displacement of the support ring, which corresponds to the rotation of sector 13 by the angle aC (Fig. 5). The outer end of each sector, together with the protrusions 15, extends beyond the packer by an amount, thus providing an overlap of the annular gap of the well. The radial movement of the protrusions 15 leads to their divergence relative to each other. The formation of gaps between adjacent protrusions 13 around the circumference does not occur, since this discrepancy is compensated for by sliding the perpendicular surfaces of these projections along the perpendicular plane of the packer.

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Simultaneously with the divergence of the sectors 13, the sealing element 3 is pressed against the wall of the casing 21. The holder 9 (upper) is displaced axially relative to the upper support ring 17, providing the upper ring gap with the projections 15 of the sectors 13 and pressing the upper part of the sealing element 3 to the wall of the casing columns 21; Further axial compression of the sealing element 3 leads to the complete filling of the annular space between the sliding supports by the deformed explanatory element, which ensures the reliability of holding the pressure differential both from top to bottom and bottom to top.

Removing a packer is as follows. By wedging, the packer is in a compressed state after removing an axial compressive load. The application of a tensile force to the upper sub 7 causes the upper collar 9 rigidly connected with it to move upwards relative to the upper support ring 17, since the latter is held by the protrusion 18 of the rod 4, the sectors 13 slide along the grooves of the ferrule, resulting in the upper sliding the support is removed, the preload of the upper part of the sealing element 3 is stopped against the wall of the casing 21. In the process of further movement of the upper sub 7 upwardly, the rod 4 is also driven with the pipe 5, which tvuet on the lower cam ring 17 and the sectors 13, tending to move them up, while the bottom sub 8 together with the lower yoke 9, the armature is held. As a result, the sealing element 3 is forced to move by the projections 15 of the sectors 13 relative to the walls of the casing 21, the sectors 13 slide along the grooves of the lower casing 9, the lower part of the sealing element is compressed against the walls of the well, the packer is removed. In the future, the packer can be rearranged to another interval of the well or raised to the surface.

Claims (2)

1. Packer, containing halogen hollow stem with annular protrusions in its top It and the lower parts, which are movably mounted on the rod, the sealing element and the upper supporting unit cooperating with it, which interacts with the upper annular protrusion of the rod, and the lower sliding supporting node, which interacts with the annular protrusion in the lower part of the rod, including the holder with radial grooves and supporting a ring with sectors connected to it with the possibility of rotation relative to it, located in the grooves of the holder with the possibility of interaction with its supporting surfaces and having protrusions in the outer ends e vakschih overlap one another the plates and the upper and lower subs connected to the support units, characterized in that, in order An increase reliability of the packer due to facilitate its stripping with  significant pressure drops, the lower support assembly is mounted on the rod with the possibility of axial displacement neither relative to it, the surfaces of the clips and sectors of the upper and lower supporting assemblies and the interacting ones: the counter surfaces of the sealing element are made in the form of concave and pressure torus surfaces, respectively, with a smooth transition into the cylindrical surface from the end section of the sealing element to its middle part , the bearing surfaces of the cage are formed by a concave torus surface, the interacting sectors of the sectors have a counter surface, and the stem in the middle part has an additional s projections adapted to cooperate with a ring-tion supports the upper and lower support assemblies. 2. Packer pop.1, characterized in that the sectors are connected to the support ring with the possibility of radial displacement relative to. it, and the axis of rotation of the sectors is located in the plane of symmetry of the torus surfaces of the cage and sectors, while the upper support node is made sliding like the bottom. Ug.3 FIG. Compiled by L.Farukshin Editor V. Bugrenkova Tehred L.Oliynyk Proofreader N.Borisova Order 5062/44 Circulation iiU VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Fm.5 Subscription