SU1571217A1 - Packer - Google Patents

Abstract

The invention relates to the mining industry and is intended to cover the annulus. The goal is to increase the reliability of the packer operation due to the possibility of reducing head losses to overcome hydraulic resistances when the fluid passes through the packer. To do this, the packer is provided with locking elements 18, each of which is made with a protrusion 22 at the end, and the housing 1, the bottom of the supporting sleeve 14 and the saddle 20 with the ball 30 have radial channels for accommodating the locking elements 18 and their projections 22, respectively. cuffs 2, 3, which, to prevent damage to the production string wall, are protected by a casing 5 with a bottom 6. In this case, the distance between the upper end of the glass 14 and the lower end of the casing 5 before lowering the packer into the well, between the upper end of the casing 5 and the lower edge of the working m The collar 3 located above the restrictive collar 4 and between the upper end of the casing 5 and the lower edge of the cuff 4 is determined from the ratio of these distances. The saddle 20 with the ball falls to the bottom of the well. The fluid pressure on the outer and inner surfaces of the bottom 6 of the housing is equalized and allows the spring 17 of the cup 14 to expand. The spring 17 expands and moves the casing 5 up to the stop of its end in the cuff 3. This further increases the effect of pressing the end portion of the spring 17 against the wall of the production string and increases the reliability of sealing the annulus with the sleeve. After these operations, the well is mastered and put into operation. 3 il.

Description

The invention relates to the mining industry, in particular to devices for blocking the annulus of wells. “The purpose of the invention is to increase the reliability of the packer due to the possibility of reducing the pressure loss to overcome hydraulic resistances when passing fluid through the packer.

FIG. 1 shows a packer during transportation to the bottom of a well;

in fig. 2 - the same at the time of packing; in fig. 3 - the same, after packing.

The package includes a housing 1, made in the form of a pipe. Self-sealing workers cuffs 2 and 3 and restrictive cuff 4 are fixed on it. The number of operating and restrictive cuffs can be any: depending on the technical requirements for reliability of sealing the annulus of the well, the reliability of removing the casing from the workers, self-sealing saddles. To prevent damage to the cuffs against the wall of the production string, they are protected by a casing 5 with one 6, a wall 7 with an upper end 8 and a guide sleeve 9 installed with a gap 10.

The casing 5, the housing 1 and the lower limiting cuff 4 form an annular ring 11 chamber 11 hydrodynamically connected by a radial opening 12 to the BHYI of the recess 13 of the tubing string.

Under the restrictive cuff 4 at a distance providing removal of the casing 5 only from the working cuffs 2 and 3, excluding removal from the cuff 4, a supporting cup 14 with an end 15 is installed. In the annular space 16 of the supporting cup 14 a spring 17 is installed which presses the casing 5 into the direction of the self sealing cuffs 2 and 3.

The locking elements 18 supporting the glass 14 is attached to the housing 1. In the cavity 13 at the level of the bottom 19 of the support cup 14 a shear saddle 20 is installed with a hole 21, which in the upper part of the saddle changes from a cylindrical to a cone-shaped one.

The cylindrical protrusions 22 at the ends of the elements 18 are mounted in the channels 23 of the saddle 20 and are secured in the cavity 13 of the packer. A gap 25 is formed between the outer wall of the casing 5 and the inner surface 24 of the production casing to ensure a smooth descent of the packer into the well to its installation site. The end portion 26 of the operating cuff, which is located above the restrictive cuff 4, restricts the movement of the casing 5 under the action of the spring 17 after unpacking the packer.

With the help of sleeves 27, the packer is fixed and installed in the lift column

five

pipes 28. The packer is assembled as follows. A self-sealing cuff 2-4 is fitted with a casing 5, and a spring 17 on the body.

The cup 14 and the saddle 20 are mounted on the body 1 so that the canal in the bottom of the glass and in the saddle are aligned coaxially with the threaded hole 29. Elements 18 with cylindrical lugs 22 the glass and the saddle are attached to the body 1 at a distance of cuffs 5 when unpacking the packer with only the working cuff 23. With the restrictive cuff 4, the casing 5 does not pull off during the unpacking of the packer. The hydrodynamic coupling of the chamber 11 with the cavity of the tubing string is carried out only through the openings 12.

In this case, the distances between the upper end of the support cup 14 and the lower end of the casing 5 charged and prepared for lowering into the well of the packer, between the upper end of the casing 5 and the lower edge of the working self-sealing cuff located above the restrictive cuff 4, as well as the distance between return the end of the casing and the lower edge of the restrictive cuff 4 are determined from the ratio

: one

s

where 1

- the distance between the upper end of the support cup and the lower end of the case, which is charged and prepared for descending into the well of the packer;

12 — distance between the upper end of the casing and the lower edge of the working self-sealing cuff located above the restrictive cuff;

1 - the distance between the upper end of the casing and the lower edge of the limit

cuffs.

f

At 12-1-1, the cover is pulled off only from the working cuffs 2 and 3 (Fig. 2). The cuff 4 remains under the cover. Chamber 11 continuously maintains hydrodynamic coupling with the cavity 13 of the tubing string until the cuff 4 is released with the cover 4. But the release of the cuff 4 can occur only if 1

ten

15

greater than 1, i.e. the ratio D,

one

five

T.chk K; IK in

3

then the limit 25

0

a cuff of 5 HP is released on the cuff. The chamber 11 therefore continuously retains the hydrodynamic structure with the cavity of the tubing.

Packer works as follows.

Before running the packer, the well is pressurized with fluid of the required specific gravity. The assembled packer with cuffs 2-4 is mounted with threaded sleeves 28 into the lift string and lowered into the well to the site of its installation.

After the end of the descent, the mud changes to water. The walls of the well near the packer are cleaned of clay and cement. A shut-off member, a ball 30, is dropped into the well. After the ball 30 has reached the saddle 20, it closes its opening. The pressure in the cavity of the tubing and the cavity 13 of the packer increase. The opening 21 of the shear seat 20 is plugged with the ball 30. The liquid rushes out of the packer cavity 13 through the opening 12 into the chamber 1I. Since the camera. 11 is sealed, the pressure of the fluid in it increases. The resulting pressure acts on the inner wall of the bottom 6 and pulls off the casing 5 only from working self-sealing cuffs 2 and 3, since the distance from the bottom 6 of the casing in its upper position to the end 15 of the cup 14 is sufficient only to remove the casing 5 from the cuff 2 and 3.

The permanent connection by the opening 12 of the cavity of the tubing string and the chamber 11 is not disturbed, since the casing 5 is not removed from the limiting cuff.

After removing the casing 5 from the cuffs 2 5 and 3, the pressure in the cavity of the tubing string is again increased by pumping fluid until the cylindrical projections 22 are cut. Seat 20 together with the ball 30 falls to the bottom hole 0 of the well. Fluid pressures on The outer and inner surfaces of the bottom 6 of the casing 5 are leveled and allow the spring 17 to expand. The spring expands and moves the casing 5 5 up to the stop of its end 8 into the working cuff 3, which further increases the effect of pressing its end portion against the wall of the production casing and increases the reliability of the seal.

0

the metallization of the self-sealing working cuff 3 above the packer space and the work of the packer as a whole. After these operations, the well is mastered and put into operation.

Formula

 A packer, comprising a body with radial holes, on which a self-sealing restrictive cuff and a working cuff above it are placed, a support cup, mounted mainly in the body of the saddle under the valve discharged from the surface, and a casing forming an annular chamber with the restrictive cuff and body; - so that, in order to increase the reliability of the packer due to the possibility of reducing the pressure loss to overcome the hydraulic resistance when the fluid passes through the packer, it is equipped with retaining elements, each of which is made with a protrusion at the end, and the body, the bottom of the support cup and the saddle has radial and coaxially made channels

Holes for accommodating fixing elements and their protrusions, respectively, while the distances between the upper end of the support sleeve and the lower end of the casing before lowering the packer into the well, between the upper end of the casing and the lower edge of the working cuff located above the restrictive cuff, and between the upper end the casing and the lower edge of the cuff cuff are determined from the ratio

15

H

: one

3

where 1

0

five

the distance between the upper end of the support cup and the lower end of the casing before the packer is lowered into the well, m;

the distance between the upper end of the casing and the lower edge of the working cuff, located above the restrictive cuff, m; the distance between the upper end of the casing and the lower edge of the restrictive cuff, m

Fig 2

Figz

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A packer comprising a housing with radial Holes, on which a self-sealing restrictive cuff and a working cuff are placed above it, a support cup mounted concentrically in the housing, a seat under the closure member discharged from the surface and a casing forming an annular chamber with a restrictive cuff and the housing, characterized I mean that, in order to increase the reliability of the packer due to the possibility of reducing the pressure loss to overcome hydraulic resistance when the fluid passes through the packer, it is equipped with wives with fixing elements, each of which is made with a protrusion at the end, and the body, the bottom of the support cup and the saddle have radial and coaxially made channels for placement of the fixing elements and their protrusions, respectively, with the distance between the top * 5 of the end of the support cup and the lower end of the casing before lowering the packer into the well, between the upper end of the casing and the lower edge of the working cuff located above the IQ reading cuff, and between the upper end of the casing and the lower edge of the restrictive cuff from the relation where 1, -g / - the distance between the upper end of the support cup and the lower end of the casing before the descent of the packer into the well, m; - the distance between the upper end of the casing and the lower edge of the working cuff located above the restrictive cuff, m; 1h ~ distance between the upper end of the casing and the lower edge of the restrictive cuff, m Figure 2 Fig.Z