SU926238A1 - Hydraulic packer - Google Patents

Description

(54) HYDRAULIC PACKER

I

The invention relates to the oil industry and can be used in testing formations with high formation pressures and in all types of casing repair when it is necessary to install an airtight jumper in the barrel.

A hydraulic packer known for testing formations is known, which includes a housing and a sealing element l.

However, this packer does not allow to divide the annular space in the process of well development.

Also known is a hydraulic packer, which is lowered into the well on pipes, including a hollow body, a metallic sealing element, a spring-loaded check valve with radial channels, a sub and a multiplier with a stepped stem and high pressure chambers 21.

However, the process of sampling the formation with the name of the packer is performed without

annular space packing. As a result of the fact that the annular space is not isolated from the 1FI test piping for gas formations with a high reservoir pressure, the drilling mud in the annular space is degassed, this leads to a drop in pressure suppression of the solution column and entails washing the casing.

The aim of the invention is to provide the possibility of annulus dilution during well completion.

The hemmed goal is achieved by the fact that the stepped multiplier rod

IS is made with radial channels, and c. the packer and the high pressure chamber are provided with annular grooves that communicate during the development period through the radiopathic channels of the valve and the stepped shaft

subpacker zone with a cavity of pipes.

FIG. Figure 1 shows the hydraulic packer. transport position, longitudinal section; in fig. 2 -; hydraulic packer with a packaged sealing element; in fig. 3 - hydraulic packer during the testing of the productive horizon; in fig. 4 - packer sealing element, packed in a casing string after the top of the left-hand sub. The hydraulic packer consists of a multiplicator, made in the form of a low pressure chamber 1, a high pressure chamber 2 with an annular shaft and an installed stepped rod 3 with radial channels 4. With the help of a right-left sub 5 the multiplicator is attached to the duralumin package 6 packer, having an annular groove B. On the body 6 with rings 7 and 8, an add-on element 9, made of an aluminum alloy, is installed. On the sealing element, the crackers 10 and I and the sealing ring 12 are fixed. Between the case and the sealing element there is a single-acting cuff 13 installed. The housing houses a spring-loaded non-return valve 14, made in the form of a glass with through radial channels 15 and a latch 16. The left-right sub is equipped with a non-return valve 17. From the bottom of the devices ends with a guide plug 18. All connections are sealed with a seal ring. The packer is lowered into the well cased with string 19. The hydraulic packer operates as follows. When lowering into the well, the packer is filled with fluid through the shoe, channel 15, annular groove B in body 6, check valve 17, annular groove A of chamber 2 and channels 4 in the multiplier rod. After the device has been lowered to the required depth, a flush is pumped into the tubing and the compressor pipes. Due to the difference in the areas of the rod 3, the multiplier is displaced by the flushing fluid, which allows the pressure in the multiplier to be fed into the cavity under the metal sealing element 9. through the holes in the left-hand. The first sub 5 and the body 6. The sealing element is pressed tightly against the walls of the casing 19 and fixed in it with the help of crackers 10 and 11. The tightness is ensured by the seal KOLYM 12. The pressure under the sealing element is maintained by the single-side cuff 13 action After that, the annular space is supplied with the pressure necessary to raise the upper position of the stepped rod 3. Through the channels through which the pumping and pumping pipes were zagged during descent, productive rqpH30HTa is developed. In this case, the replacement of fluid in the annular space to call for the influx of reservoir fluid occurs through a conventional circulation valve located above the device. Thus, the degassed reservoir fluid does not enter the annular space and c. there can be no pressure drop below the critical level at which the casing is smashed. After the development of the productive horizon is completed, the tubing pipe is given a true rotation, as a result of which the right-left sub 5 turns out of their casing 6. At the same time, dinner 20 unlocking it moves the plug 14 to the extreme upper position in which it is fixed by means of the lock 16. With this, the holes 15 of the plug are blocked, the tubing pipes together with the multiplier and the left-right pe one is lifted to the surface, and a bridge remains in the well, hermetically overlapping the casing section. The use of the proposed packer helps prevent accidents with casing in the process of well development, as it allows to isolate the annulus from the in-pipe to the development of productive horizon. Claims of the invention A hydraulic packer, lowered into the well on pipes, includes a hollow body, a metal sealing element, a spring-loaded non-return valve with radial channels, a sub and a multiplier with a stepped stem and low and high pressure chambers, characterized in that space in the process of development of the well, a stepped stock multiplier is made with

5 9262386

radial channels, and in the case of pa-sources of information,

The kera and high-pressure chambers are taken into account in the examination

veins annular grooves reporting1- USSR Author's Certificate

during the period of development through radialN 5О9710, cl. E 21 V 38/12, 1974.

valve channels and stepped valves 2. USSR Certificate of Authorship

subpacker zone with a cavity of pipes. I 599047, cl. E 21 V 33/12, 1975.

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one

S55

Claims (1)

Claim A hydraulic packer lowered into the borehole on the pipes, including a hollow body, a metal sealing element, a spring-loaded check valve with radial channels, an adapter and a multiplier with a stepped rod and low and high pressure chambers, characterized in that, in order to allow the separation of the annular space in in the process of well development, the stepped rod of the multiplier is made with radial channels, and annular grooves are made in the packer body and high-pressure chamber, communicating the period of development through the radial channels and a stepped valve stem packer area with the cavity tubes.