SU1370226A1 - Double packer for isolating tested interval of a well - Google Patents

Abstract

The invention relates to engineering and geological surveys and allows to increase the reliability of the packer operation by providing synchronous and independent deformation of the distorting elements. The packer includes a hollow body (PC) with radial holes, sealing elements 11, 14 with retaining rings 12, 13, 15, 16. Between the holes on the PC are not

Description

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The clutch 3 is movably mounted, and above and below the holes, on threads 4,5 of the opposite direction - the upper 6 and lower 8 jack nuts with pushrods 21, 22 in the form of cylindrical (P). On the nuts 6, 8 fixed centralizers with directed one towards the other arcuate P 7, 9, the end of which are free. Moreover, P 7 of the centralizer are located on the P / n 9 niDKHei o centralizer with

the possibility of their free ends interacting with axial movement of nuts 6, 8 with coupling surfaces 3 made conical. When the PC rotates, the nuts 6, 8 move synchronously across the PC, moving the pushers 21.22 apart from one another and squeezing. The force from them is transmitted to elements 11, 14, which cover the gap between the PC and the well. To remove the packer, the PC is rotated in the opposite direction. 1 hp f-ly, 1 ill.

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The invention relates to environmental engineering, in particular, to devices for isolating the well being tested and wellbore in the production of a netbot 11a1 nettle; fluid or gas to rocks,

The purpose of the invention is to increase the reliability of the dual packer by ensuring synchronous and independent .1; deformations of its sealing eleg- .rntov.

At h C) is also represented by a double. . packer, cut (on the left side - in the original position, on the right side - in the working floor (genia).

The packer includes a hollow body with radial holes, consisting of a drive pipe 1 and a pipe 2, which are not connected with a coupling 3. The case has threads 4 and 5 of the opposite direction, on which the upper jack-nut 6 is installed with arched spring-wedge 7 and lower jack nut 8 with springs of 9 centralizers. Coupling 3 is made at the ends with conical sections directed towards the center of the base. The springs 7 and 9 of the centralizers are directed towards each other by their free ends and are placed in such a way that the springs 7 fit between the springs 9, i.e. Home — multiple nuts 6 and 8 do not allow turning one relative to another by more than a fraction of a turn. The lower end of the nozzle 2 is closed tightly with a plug 10. The packer also includes the upper sealing element 1 1,

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placed between the rings 12 and 13, and the lower sealing element 14 placed between the rings 15 and 16. Between the washer 17 rigidly mounted on the drive pipe 1 and the ring 12. there is a thrust bearing 18 and between the washer 19 on the nozzle 2 and the ring 16 - a thrust bearing 20. The ring 13 rests on the spring follower 21, and the ring 15 - on the spring follower 22.

Packer works as follows.

A packer on a string of drill pipes that can be reversed is lowered into the well to a predetermined depth, the springs 7 and 9 of the centralizers contacting the walls 23 of the well, and their free ends are located on the outer surfaces of the pipe 1 and pipe 2, jack nuts 6 and 8 as close as possible to each other, the springs 21 and 22 are expanded, and the sealing elements 11 and 14 do not touch the walls 23 of the well (as shown on the left side of the drawing).

Having reached a predetermined depth, rotate the drive pipe T in the direction that allows the movement of the jack nut 6 up and the nut 8 down. If at the same time at the level of the springs of the centralizer of one of the nuts is tight and the nut starts to turn due to insufficient pressing of the springs, then at the contact of its springs with the springs of the other centralizer, the nut is stopped. Both nuts, braked by turning one relative to the other, begin synchronous axial movement along the body, moving away from one another and compressing the springs 21 and 22. The force from the springs is transmitted to the sealing elements 11 and 14, which under the effect of this force increase in diameter and overlap the gap between the package body and the borehole wall (as shown on the right side of the drawing).

When moving the jacking nuts 6 and 8 from each other, the springs 7 and 9 of the centralizers move onto the conical sections of the outer surface of the coupling 3 and press out in the radial direction, increasing their adhesion to the borehole wall during deformation of the sealing elements of the packer.

To remove the packer from its position, the drive pipe 1 is rotated in the opposite direction. In this case the jacking nuts 6 and 8 move one towards the other, shifting the springs 7 and 9 of the centralizers from the coupling 3 and relieving the axial force from the sealing elements, which return to the initial position. After that, the packer is moved to the next depth or removed from the well.

Claims (2)

1. Double packer to isolate the well interval being tested, including a hollow body with radial holes, mounted on the body above and below the radial holes and on the threads of the opposite direction, the upper and lower jack nuts with pushers, nuts fixed centralizers with arc-springs directed towards one another, sealing elements with stop rings and stationary at the ends of the body, stops with sub-supports, characterized in that, in order to increase the reliability of the packer operation by ensuring synchronous and independent deformation, compact They are fitted fixedly mounted on the housing between the radial holes of the coupling, and the oppositely directed ends of the arcuate springs of the centralizers are made free, while the springs of the upper centralizer are placed between the springs of the lower centralizer with the possibility of their free ends interacting with the coupling when axially moving the socket nuts . 2. The double packer according to claim 1, dt is characterized in that the coupling surfaces interacting with the centralizer springs are tapered and the tappets are cylindrical springs.