SU883332A1 - Packer - Google Patents

Description

(54) PACKER

The invention relates to oil and gas production (it industry, namely, drilled packers used in the drilling and operation of oil and gas wells.

Known packer, including the barrel, seal, housing with a casing, forming with the housing chamber in which the piston 1.

however, a valve for creating pressure on the seal is permanently installed in the axial channel, and the pressure for the required pressing of the sealer needs to be increased to significant values.

Also known is a packer comprising a barrel, a sealant, a spindle assembly, a housing with windows connected to the barrel, a housing forming an annular chamber with the housing, in which a pusher is installed, which interacts with a saddle, one end of which is installed in the windows of the housing 2.

The disadvantages of the packer is that when the saddle is used repeatedly, the cross sectional area of the packer is not efficiently used. As the working area of the piston, only an insignificant annular area of the cross section is used. It is impossible to unify such packers: it is possible, since in order to provide the required compression of the sealant, it is necessary to increase the pressure of the injected fluid to seal values that exceed the permissible safety limits to seal the different wells;

The purpose of the invention is to increase the pressure on the seal while re-using the seat.

The goal is achieved by the fact that the saddle is made ideally with the lower end of which is spring-loaded relative to the pusher, and the casing of the upper part on the inner surface has a protrusion.

FIG. 1 shows a packer, a general view; in fig. 2 - top (unshakeable), part of the packer in the working position before relieving the pressure of the injected fluid; see 3 - upper part of the packer after pressure relief; in fig. 4 - section aa in figure 1

Packer consists of drillable and indelible parts.

The spacing part includes a housing 1 (FIG. 1) with an axial passage 2 and longitudinal windows 3, a housing 4c with an internal protrusion 5 which forms with the housing 1 an annular chamber 6 communicating with the passageway 2 through the window 3. A circular piston is placed in chamber 6

7 with a seal 8 and a pusher 9, a saddle 10, made in the form of racks with protrusions 11 and 12 at one end and with a recess 13 and an emphasis 14 with a spring 15 at the other. The protrusions 11 of the saddle 10 are placed in the windows 3 and together with the reset plug 16 form a unit for creating a pressure differential, and the projections 12 interact with the casing 4. The saddles of the saddle 10 tightly cover the windows 3 and through the recesses 13 and the spring loaded stops 14 interact with the annular piston 7.

The drilled part of the packer consists of a barrel 17 with mounted horn-cone bushings 18 and 19 mounted on it, between which a compactor 20 is placed, as well as dies 21 and.22. In the sleeve 18 there is a retaining ring 23, which engages with notches 24 on the barrel 1, the lower die 22 is connected to the barrel 17 on the thread and tucked by the shoe 25, which simultaneously holds the saddle 26 for the stopper.

The device works as follows.

The packer is lowered into the well to the desired depth on the string of drill pipe, into which a plug 16 is then thrown and a fluid is pumped. The stopper sits on the protrusions 11 of the seat 10 and overlaps the axial channel 2. The pressure in the pipes increases. The latter acts on the cross-sectional area of the plug 16 and the annular piston 7 by moving them down. In this case, the pusher 9 acts on the top plate 21, which transmits the force to the sleeve 18, which in turn compresses the seal 20. When the pusher 9 is moved downward, the plate 21 breaks and engages the borehole wall. Next, tension the drill pipe string.

The housing 1 with the housing 4, the barrel 17 with the die 22 and the sleeve 19 on it are moved upward and the seal 20 is further compressed, as a result of which the annular space of the well is sealed. The retaining ring 23 thus fixes the seal 20 in the working position, and the die 22 breaks and engages the borehole wall. The saddle struts 10 do not diverge radially due to the positive difference between radially converging forces on the struts covering the windows 3 arising from the pressure in the axial channel and the elastic forces of the springs 15. Then relieve the force of elasticity of the strings 15 overcome by other forces on racks 10 and the last consumption t0 s, freeing the cork 16. After completing the necessary technological operations, B channel 2 of the packer throws the cork, which is pushed with the calculated amount of liquid before landing in the saddle 26.

To remove the untouched portion of the borer packer, the drill pipe string is rotated to the right until it is separated from the portion being drilled and pushed onto the surface.

Due to this design of the assembly to create a pressure drop in the packer, at relatively low pressures, it is possible to significantly increase the pressure on the sealing element, since the packer uses not only the annular area of the piston, but also its axial channel. With

The seat for the dump valve is used repeatedly. This allows a single dimension of its non-dilutable part to fit several sizes of the drilled portions of the packer in accordance with the dimensions of the wells, i.e. unify it.

The positive effect of the use of the packer is achieved by saving money on the production of additional non-reliquable parts for other packer sizes.

Claims (2)

1. USSR author's certificate number 597813, cl. E 21 V 33/12, 1976. 2. USSR author's certificate per application 8 2612472, cl. E 21 V 33/12, 1978. 40 4i 50 FIG. g JL ±.