RU142771U1 - PACKER - Google Patents

Abstract

A packer, comprising a housing in the form of an expandable smooth pipe with elastic external seals and a sleeve located below the bottom with an internal polished surface under the nipple, a hydraulic actuator with one or more pistons connected by a hollow rod muffled from below, and with an expanding cone made with an inclination angle of the conical surface 10- 40 ° and the diameter of the base is smaller in magnitude than the difference between the inner diameter of the production string and the double wall thickness of the pipe, characterized in that the expandable pipe with from above and above the sleeve, it is equipped with an extension for the expanding cone inserted into it, rigidly connected to the hydraulic actuator rod, which in turn is made with the possibility of abutment against the upper end of the expandable pipe, the sleeve is equipped with conical expanding upward guides, external transverse pins and an anchor located outside from the upper inwardly spring-loaded dies made with the possibility of longitudinal movement relative to the sleeve and interacting with conical guides in the working position for I fixation relative to the walls of the production casing, and the spring centralizer installed with the possibility of rotation relative to the dies and provided with open brackets from below, made with the possibility of interaction from below with the corresponding sleeve pins in the transport position.

Description

The utility model relates to the oil and gas industry, in particular to devices for separating well cavities.

Known drillable packer containing a landing tool consisting of a hydraulic cylinder with a lower stop, a piston with a sub at the top, the upper and lower rods, the last of which is made with radial channels and rigidly connected through a tip having technological holes, with a perforated nipple, of a sealing assembly including cuff, deformable sleeve and mandrel with an expanding angle at the top, connected at the bottom with a nozzle through a shear ring with a tip and a perforated nipple, which is installed in a mandrel equipped with external cylindrical sections of a shut-off valve and a plug fixed in the nozzle with a retaining ring, the tip being telescopically inserted directly into the deformable sleeve and the lower stop, relative to which the tip is fixed with a shear screw in the transport position, and the shut-off valve is made in the form of a plug with an outer ring sample, hermetically inserted into the tip and fixed by stoppers that are inserted into the technological holes of the tip with air the possibility of limited movement outward when the shear ring is broken and the mandrel passes, as well as with the possibility of interacting in the transport position from the inside with the annular cork sample, and from the outside with the mandrel having an expanding angle of 20-25 ° relative to the axis of the packer and a single cylindrical outer section with the sample, having a conical chamfer at the top, in which there are slots made with the possibility of interaction with the deformable sleeve on the outside and with the conical chamfer of the sample from the inside, while on the mandrel outside from the bottom shear elements ntami fixed sleeve with chamfers at the ends, the outer diameter of which exceeds the outer diameter of the cylindrical portion of the mandrel and the inner cylindrical surface of the deformable sleeve is formed with two-step smaller diameter at the top (patent RU №2395669, E21B 33/12, publ. 07/27/2010).

The disadvantages of this packer are:

- high cost, since the landing tool does not disconnect during the pumping process, that is, to complete the technological operations, the landing tool remains attached to the packer, fluid is pumped through it, which negatively affects the service life of the landing tool, as well as each packer during technological operations require a separate landing tool, which requires several landing tools to carry out similar operations;

- narrow scope, since it is impossible to select the products of the lower layer, since after disconnecting the planting tool, the passage channel is hermetically sealed with a stopper;

- a large resistance to the flow of the pumped liquid due to the small flow area for it, since it is impossible to make it large due to the presence of a large number of parts inserted into each other (sleeve with o-rings on the outside, mandrel, tip, and the tip and mandrel must have sufficient thickness to exclude their destruction during lorning of the sleeve).

There is also known a cutoff system of a formation that is lowered into a well on a pipe string consisting of upper and lower columns, comprising a packer, a pump, a disconnector located above the packer, which can be placed in the well to the depth of the packer installation of the lower pipe string and replace the upper pipe string, and a nipple made on the disconnector, the system comprising a valve block including a shut-off valve and a locking device located in the nipple located on the bottom pipe string in the form of a shank and connected to the device a blade for its installation (removal) equipped with a jar having the ability to install the valve block in the nipple by means of a locking device, disconnected from it and lifted from the well, containing a mounting collet, which is placed with a stop in the entry chamfer of the pipe connecting the installation (removal) device with the lock the device containing a gripping collet located on the end of the nipple, and fixing the collet, spring-loaded with a spring relative to the axis of the valve-shutoff and having the ability to pair with the nipple, the system contains akzhe catcher mechanical impurities formed as a pipe with a partition in the middle and rows of holes in its upper and lower parts and provided in its upper portion a sealing rubber ring (PM patent RU №84456, E21B 43/00, publ. 07/10/2009).

The disadvantages of this device are:

- the high cost of both the equipment itself and complex technological operations, due to the structural complexity of all equipment elements and operations;

- low reliability, due to the absence of anchor elements in a packer with an non-expandable case, which, as experience has shown, leads to the “sliding” of the armature from the installation interval in 90% of cases, while the complex valve assembly is directly located in the well fluid stream with abrasive inclusions , which leads to failure of up to 50% of such structures during the first two months of operation;

- a large resistance to the flow of the pumped liquid due to the small flow area for it, since it is impossible to make it large due to the presence of a large number of parts inserted into each other (non-expandable packer with O-rings on the outside, a complex body and valve assembly with many elements, inserted into each other).

The closest is a packer, comprising a housing in the form of an expandable smooth metal pipe with elastic seals and a hydraulic actuator with an expanding cone, characterized in that the elastic seals are placed in annular cylindrical grooves and are made with an outer size of not more than the outer diameter of the pipe, an expanding cone is installed at the lower end hydraulic drive and is made with an angle of inclination of the conical surface of 10-40 ° and a diameter of the base, smaller in size than the difference in the internal diameter of the operational columns and doubled pipe wall thickness, a connecting unit is installed on the lower end of the casing, and the hydraulic actuator rod is equipped with a releasing catch caught on the connecting unit (patent RU No. 2227202, E21B 33/00, published on 04/20/2004).

The disadvantages of this packer are:

- low reliability, due to the lack of anchor elements in a packer with an expandable branch pipe, which, as experience has shown, leads to the “sliding” of the anchor from the installation interval in 40% of cases during the first months, and in 80% within two years;

- a large resistance to the flow of the pumped liquid because of the small flow area for it, since it is impossible to make it large because of the need to make a large thickness at the connecting sleeve (connecting node) with a polished inner surface, since the hydraulic actuator rod rests on its lower end for expanding cone lance.

The technical task of the proposed utility model is to increase the reliability of the installation of the packer due to the presence of the anchor unit and to reduce the resistance to the flow of the pumped liquid due to the increase in the bore due to the exclusion of large axial loads in the connecting sleeve when installing the packer.

The technical problem is solved by a packer, comprising a housing in the form of an expandable smooth pipe with elastic external seals and a sleeve located below the bottom with an internal polished surface under the nipple, a hydraulic actuator with one or more pistons connected by a hollow rod, and with an expanding cone made with an angle of inclination of the conical surface 10 -40 ° and the diameter of the base, smaller in size than the difference between the inner diameter of the production string and double the wall thickness of the pipe.

New is that the expandable pipe from the bottom and above the sleeve is equipped with an extension under the expansion cone inserted into it, which is rigidly connected to the hydraulic actuator rod, which, in turn, is capable of abutting against the upper end of the expandable pipe, the sleeve is equipped with conical, upwardly extending upward guides with transverse pins and an external anchor consisting of upper dies spring-loaded inside, made with the possibility of longitudinal movement relative to the sleeve and interacting with taper guides in the working position for fixing relative to the walls of the well, and a spring centralizer mounted for rotation relative to the dies and provided with open brackets from below, arranged to interact from below with the corresponding bushing pins in the transport position.

In FIG. 1 shows a packer with a partial longitudinal section.

In FIG. 2 shows a section aa (see Fig. 1)

In FIG. 3 shows a section bB (see Fig. 1)

The packer includes a housing in the form of an expandable smooth pipe 1 (Fig. 1) with elastic external seals 2 and a sleeve located below the bottom 3 with an internal polished surface 4 for a nipple (not shown in Fig. 1), a hydraulic actuator 5 with one or more pistons 6 connected hollow muffled from below by a rod 7, and with an expanding cone 8, made with an angle of inclination of the conical surface of 10 ° -40 ° and a diameter of the base B, smaller in size than the difference between the inner diameter of the production string (not shown in Fig. 1) and doubled thickness h ste ki of the nozzle 1. The expandable nozzle 1 from the bottom and above the sleeve 3 is equipped with an extension 9 under which the expanding cone 8 is inserted, connected rigidly to the rod 7 of the hydraulic actuator 5, which in turn is made with the possibility of abutment in the upper end 10 of the expandable nozzle 1. The sleeve 3 is on top equipped with tapering upward extending rails 11, external transverse pins 12 and an anchor 13 arranged externally. Anchor 13 consists of upper dies 14, spring-loaded inward, made with the possibility of longitudinal movement relative to the sleeve 3 and -interaction with the conical guide 11 at the operating position for locking against the walls of the production tubing and spring centralizer 15 mounted rotatably relative to dies 14 and provided with open bottom brackets 16 adapted to engage from below with respective pins 12 of the sleeve 3 in the transport position.

For the longitudinal movement of the dies 14, the upper part of the armature 13 can be equipped with one or more internal protrusions 17 (Fig. 2), inserted into the longitudinal groove or longitudinal grooves 18 (Fig. 1, 2 and 3) of the sleeve 3, or the inner surface of the armature 13 is made in in the form of longitudinal one or more grooves (not shown in FIG.) under the longitudinal protrusions (not shown in FIG.) of the sleeve 3. Other technical solutions can also be used to achieve a similar result.

Cone guides 11 (Fig. 1 and 3) for the rams 14 can be made flat (Fig. 3) or other arbitrary shape (not shown in Fig.) For longitudinal sliding along them of the rams 14 (Fig. 1)

The lower part of the armature 13 is rotatably connected to the upper part.

Process seals and connections are shown in FIG. 1, 2 and 3 are conditionally or not shown.

The packer works as follows.

The packer is lowered into the well (not shown in FIG.) On the pipe string 19 until the installation interval. In this case, the cone 8 installed in the extension 9 of the pipe 1 connects to the hydraulic actuator 5, the spring centralizer 15 slides along the walls of the production string, the brackets 16 interact in the transport position with the transverse pins 12 of the sleeve 3, not allowing the dies 14 to interact with the conical guides 11. reaching the installation interval, the pipe string 19 is raised by 0.5-1.5 m., and then lowered with a turn in the direction of the pipe turn 19, the spring centralizer 15 is not rotated and holds the anchor 13 relative to the casing, the pins 12 exit ny of the brackets 16, the anchor 13, during the descent of the packer moves upward relative to the sleeve 3, the ram 14 moving to the operating position, begin to interact with the guide cone 11 interacts with the production string and packer locking relative thereto. The fixation of the packer is controlled by weight reduction on the wellhead weight indicator (not shown in FIG.), Which indicates the successful installation of the packer in the installation interval. To seal the packer inside the pipe string 19 and the rod 7, liquid is pumped into the hydraulic actuator 5 under the pistons 6, which move up together with the rod 7 and the expanding cone 8, while the hydraulic actuator 5, resting against the end face 10, holds the pipe 1 from moving upwards the cone 8 expands (dorn) the pipe 1 hermetically pressing it with seals 2 to the walls of the production string. After completion of the expansion of the pipe 1, the expanding cone leaves it and, together with the hydraulic actuator 5, is removed from the well along the pipe 19 in the pipe string. Since the sleeve 3 is not involved in lorring the nozzle 1 with a cone 8, it can be made thin, significantly increasing the flow area for the fluid flow. And the presence of the anchor 13 eliminates the "sliding" of the packer after installation. After removing the hydraulic actuator 5, a plunger with seals is lowered onto the pipe string (not shown in Fig. 1) into the well, which, having entered inside and interacting with the polished inner surface 4 of sleeve 3, completes the separation of the well into two cavities. After installing the plunger, it is possible to pump liquid and reagents under the packer along the pipe string or into the space above the packer along the annulus, it is also possible to select products from the sub-packer space along the pipe string, eliminating the effect of pressure drop on the over-packer space.

The design of the proposed packer allows to increase the reliability of its installation in the required interval due to the presence of the anchor unit and to reduce the resistance to the flow of the pumped liquid due to the increase in the bore due to the exclusion of large loads in the sleeve when installing the packer.

Claims (1)

A packer, comprising a housing in the form of an expandable smooth pipe with elastic external seals and a sleeve located below the bottom with an internal polished surface under the nipple, a hydraulic actuator with one or more pistons connected by a hollow rod muffled from below, and with an expanding cone made with an inclination angle of the conical surface 10- 40 ° and the diameter of the base is smaller in magnitude than the difference between the inner diameter of the production string and the double wall thickness of the pipe, characterized in that the expandable pipe with from above and above the sleeve, it is equipped with an extension for the expanding cone inserted into it, rigidly connected to the hydraulic actuator rod, which in turn is made with the possibility of abutment against the upper end of the expandable pipe, the sleeve is equipped with conical expanding upward guides, external transverse pins and an anchor located outside from the upper inwardly spring-loaded dies made with the possibility of longitudinal movement relative to the sleeve and interacting with conical guides in the working position for I fixation relative to the walls of the production casing, and the spring centralizer, mounted with the possibility of rotation relative to the dies and provided with open brackets from below, made with the possibility of interaction from below with the corresponding bushing pins in the transport position.