RU92689U1 - PACKER WITH CABLE INPUT - Google Patents

Abstract

A packer including a shaft, upper and lower sub connected to the shaft, upper and lower brackets located at the ends of the shaft, mated to the corresponding sub, a pipe fixed in the upper and lower brackets and mounted eccentrically relative to the shaft located inside the pipe, an anchor and a sealing an element placed on the pipe, a cable channel located between the shaft and the pipe, and a cable, the cross section of which corresponds to the eccentricity of the shaft and pipe, stationary in the cable channel connected with its upper and lower ends with upper and lower electrical connectors mounted respectively on the upper and lower brackets in the presence of a stabilizing chamber filled with non-conductive fluid, characterized in that a single stabilizing chamber is formed between the upper and lower electrical connectors, shaft and pipe on the upper a sleeve is made to the bracket, forming together with the upper bracket a compensation cavity and having an annular hole connecting the compensation cavity to the outer space and a self-regulating pressure compensator is placed, consisting of two pistons, respectively upper and lower, with o-rings and a spring installed between the upper and lower pistons, located in the compensation cavity, connected to a single stabilizing chamber with a hole made in the upper bracket and connecting a single a stabilizing chamber with an over-piston cavity of the upper piston, and the under-piston cavity of the lower piston is communicated with an annular hole to fill the compensation cavity

Description

The utility model relates to the oil and gas industry and can be used in oil production in a well installation with an electric centrifugal pump.

Known packer containing a hollow barrel, a sealing element and a multifunctional channel located between the barrel and the sealing element and filled with filler, which houses the cable and / or control device, RU No. 56939 U1, ЕВВ 33/12, 2006.09.27.

A device for simultaneous and separate operation of several layers in oil wells, including a sucker rod pump installed inside the pipe string, an electric centrifugal pump with a packer equipped with a channel for cable wiring, RU No. 68584 U1, ЕВВ 43/00, 2007.06.25.

Known packer with a mechanical anchor, including a shaft, sub, connected to the shaft, an anchor with spring loaded crackers and control fingers placed in curly grooves, stops and a sealing element installed between the stops, RU No. 2208128 C1, ЕВВ 33/12, 2003.07.10 .

Known packer, including a shaft, sub connected to the shaft, two brackets located at the ends of the shaft, paired with sub and having longitudinal holes and side holes with seals, a pipe fixed in brackets and mounted eccentrically relative to the shaft located inside the pipe, a mechanical anchor placed on the pipe, with spring loaded crackers and control fingers placed in curly grooves made on the pipe, stops placed on the pipe, sealing element installed between the stop ami, a cable channel located between the shaft and the pipe, with cable entries located in the longitudinal and lateral holes of the brackets with seals, and a cable with a cross section that determines the eccentricity of the shaft and pipe, RU No. 77634 U1, E21B 33/12, 2008.10.27 .

In a well-known downhole installation, an electric centrifugal pump is located below the packer, which requires additional work to seal the cable entries, this complicates the operation and reduces the manufacturability of the packer installation.

Known packer with a cable entry, including a shaft, upper and lower sub connected to the shaft, upper and lower brackets located at the ends of the shaft, interfaced with the corresponding sub, a pipe fixed in the upper and lower brackets and mounted eccentrically relative to the shaft located inside the pipe , an anchor and a sealing element located on the pipe, a cable channel located between the shaft and the pipe, and a cable whose cross section corresponds to the eccentricity of the shaft and pipe placed in the cable Channel fixedly connected with their upper and lower ends with upper and lower electrical connectors mounted respectively on the upper and lower bracket in the presence of a stabilizing chamber filled with electrically non-conductive fluid, RU №82748 U1, E21B 33/12, 2009.05.10.

This technical solution was adopted as the "closest analogue" of this utility model.

In the design of the “closest analogue” packer, two stabilizing chambers are made in the upper and lower brackets, each of which has a pressure compensator installed, respectively, however, their volume is not enough to compensate for thermal expansion of the fluid and hydrostatic compression by the external fluid of the shaft and pipe when the packer is lowered into the well and also in the design of the “closest analogue” packer, two sealing units are provided that divide the cavity between the shaft and the pipe into three cavities (upper, middle and lower), from In the middle there is no pressure compensator, and if it is poured with liquid, then with significant thermal expansion it can inflate the pipe, which will make it impossible for the packer to fit in high-temperature wells, and if air is left in the middle part, then the hydrostatic pressure will deform the pipe and shaft inside this cavity, which will lead to inoperability of the packer when it is planted.

The present utility model is based on the solution of a problem that makes it possible to increase the packer’s performance when operating it with an electric centrifugal pump and to provide reliable pressure compensation when lowering it into the well.

The technical result of this utility model consists in the implementation of a single stabilizing chamber between the upper and lower electrical connectors, the shaft and the pipe, provided that non-conductive fluid is introduced into it, as well as in the placement of a sleeve forming the compensation cavity on the upper bracket and the installation of a self-regulating pressure compensator, consisting of two pistons and a spring between them, provided that the compensation chamber communicates from the upper side with a stabilizing chamber, from the lower side with the outer anstvom and retaining air inside it.

According to a utility model, this problem is solved due to the fact that the packer includes a shaft, upper and lower sub connected to the shaft.

The packer includes upper and lower brackets located at the ends of the shaft and paired with the corresponding sub.

The packer includes a pipe mounted in the upper and lower brackets and mounted eccentrically relative to the shaft. The shaft is located inside the pipe.

The packer includes an anchor and a sealing element located on the pipe.

The packer includes a cable channel located between the shaft and the pipe, and a cable, the cross section of which corresponds to the eccentricity of the shaft and pipe, stationary in the cable channel, connected with its upper and lower ends to the upper and lower electrical connectors. Electrical connectors are mounted on the upper and lower brackets.

The packer provides for the presence of a stabilizing chamber filled with non-conductive fluid (the “closest analogue” has two of them - the upper and the lower).

A single stabilizing chamber is formed between the upper and lower electrical connectors, the shaft and the pipe. A single stabilizing chamber is filled with a non-conductive fluid.

A sleeve is made on the upper bracket, forming, together with the upper bracket, a compensation cavity and having an annular hole connecting the compensation cavity to the outer space.

A self-adjusting pressure compensator is located on the upper bracket.

The self-regulating pressure compensator consists of upper and lower pistons with o-rings and a spring. A spring is installed between the upper and lower pistons.

The upper, lower pistons and the spring are located in the compensation cavity, which is connected to a single stabilizing chamber through the hole. The hole is made in the upper bracket and connects a single stabilizing chamber with the above-piston cavity of the upper piston.

The piston cavity of the lower piston is communicated with an annular hole to fill the compensation cavity with borehole fluid, while the air left between the upper and lower pistons acts as an additional spring.

The applicant has not identified sources containing information about the technical solution that is identical to the characteristics given in the formula of this utility model, this determines, according to the applicant, the utility model meets the criterion of “novelty”.

The essence of the utility model is illustrated by drawings, which depict:

figure 1 - Packer with cable entry (section).

figure 2 - Node And figure 1.

figure 3 - Node B in figure 1.

Packer contains:

Val - 1.

Upper sub (connected to shaft 1) - 2.

Lower sub (connected to shaft 1) - 3.

Upper bracket (paired with sub 2) - 4.

The sleeve (on the bracket 4) - 5,

compensation cavity (in the sleeve 5) - 6,

annular hole (in the sleeve 5) - 7.

Self-adjusting pressure compensator (on bracket 4) - 8.

The upper piston (compensator 8 in the cavity 6) - 9,

O-rings (piston 9) - 10,

supra-piston cavity (piston 9) - 11,

hole (in bracket 4 on the piston side 9) - 12.

The lower piston (compensator 8 in the cavity 6) - 13,

O-rings (piston 13) - 14,

the piston cavity (piston 13) - 15.

The spring (between pistons 9 and 13) is 16.

The bottom bracket (paired with a sub 3) - 17.

Pipe (fixed in brackets 4 and 17) - 18.

Anchor (on pipe 18) - 19.

Sealing element (on pipe 18) - 20.

Cable channel (between shaft 1 and pipe 18) - 21.

Cable (in channel 21) - 22.

The upper electrical connector (on bracket 2) is 23.

Bottom electrical connector (on bracket 17) - 24.

A single stabilizing chamber (between connectors 23, 24, shaft 1 and pipe 18) is 25.

The packer includes a shaft 1, upper 2 and lower 3 sub, upper 4 and lower 17 brackets, pipe 18, anchor 19, sealing element 20, cable channel 21 and cable 22.

The upper 2 and lower 3 sub are connected to the shaft 1.

The upper 4 and lower 17 brackets are located at the ends of the shaft 1 and are paired with the upper 2 and lower 3 sub.

The pipe 18 is fixed in the upper 4 and lower 17 brackets and mounted eccentrically relative to the shaft 1 located inside it.

Anchor 19 and sealing element 20 are placed on the pipe 18.

Cable channel 21 is placed between the shaft 1 and the pipe 18.

Cable 22 is placed in the cable channel 21 stationary. The cross section of the cable 22 corresponds to the eccentricity of the shaft 1 and pipe 18. Cable 22 is connected by the upper and lower ends to the upper 23 and lower 24 electrical connectors. The upper 23 and lower 24 electrical connectors are installed, respectively, on the upper 4 and lower 17 brackets.

Between the upper 23 and lower 24 electrical connectors, the shaft 1 and the pipe 18, a single stabilizing chamber 25 is formed. A single stabilizing chamber 25 is filled with a non-conductive fluid.

A sleeve 5 is made on the upper bracket 4, forming, together with the upper bracket 4, a compensation cavity 6. The sleeve 5 has an annular hole 7 that connects the compensation cavity 6 to the outer space.

On the upper bracket 4 is placed a self-regulating pressure compensator 8. The self-regulating pressure compensator 8 consists of an upper 9 and a lower 13 pistons and a spring 16. A spring 16 is installed between the upper 9 and the lower 13 pistons.

The upper 9 and lower 13 pistons and spring 16 are located in the compensation cavity 6.

The upper 9 and lower 13 pistons are made with o-rings 10 and 14, respectively.

Compensation cavity 6 is connected to a single stabilizing chamber 25 using an opening 12 made in the upper bracket 4 and connecting a single stabilizing chamber 25 to the over-piston cavity 11 of the upper piston 9.

The under-piston cavity 15 of the lower piston 13 is in communication with the annular hole 7 of the sleeve 5. The annular hole 7 provides filling of the compensation cavity 6 with the borehole fluid. The air left between the upper 9 and lower 13 pistons acts as an additional spring.

The installation of the packer in the well is as follows.

The packer is preparing for the descent in the workshop. A cable 22 is fixedly mounted in the cable channel 21, the ends of which are connected to the upper 23 and lower 24 electrical connectors, respectively.

A non-conductive liquid is poured into a single stabilizing chamber 25.

The packer, together with an electric centrifugal pump (not shown) on the pipes, is lowered into the well.

As the packer descends into the well, as soon as the static fluid pressure exceeds the force of the spring 16, the lower piston 13 will begin to move upward and compress the spring 16 and the air in the compensation cavity 6 between the upper 9 and lower 13 pistons. At the same time, the same pressure will begin to compress the walls of the shaft 1 and pipe 18, reducing the volume of a single stabilizing chamber 25. The upper piston 9 will move to the lower piston 13, compensating for the increasing pressure with a constant difference inherent in the design of the self-regulating pressure compensator 8. The upper 9 and lower 13 pistons simultaneously begin to move synchronously downward, compensating for the pressure.

In this case, the pressure during the descent of the packer into the well is compensated by the upper piston 9, and the hydrostatic pressure generated during the immersion of the packer into the well is compensated by the lower piston 13. The compressed air between the upper 9 and lower 13 pistons and the spring 16 create back pressure for reliable operation of the rubber sealing rings 10 and 14, respectively, and also allows the upper 9 and lower 13 pistons to occupy an intermediate position, which automatically ensures equalization of hydrostatic pressure and thermal pressure extensions.

The packer is lowered during the interaction of its anchor 19 with the production casing to the place of its installation. Anchor 19 is wedged on the walls of the production casing. With further descent of the pipes, the sealing element 20 is compressed by the amount of unloading of the weight of the pipes, ensuring the tightness of the packer.

An electric centrifugal pump is launched and oil is produced.

To remove the packer, they lift the pipes up and the packer automatically takes the transport position.

After lifting the packer, the spring 16 will spread the upper 9 and lower 13 pistons to the initial position.

The implementation of a single stabilizing chamber 25, filling it with a non-conductive fluid and installing a self-regulating pressure compensator 8 with a compensation cavity 6 provide pressure compensation during the descent of the packer into the well and increase its performance.

The presence of the upper 9 and lower 13 pistons allow isolating one medium from another.

The installation of the spring 16 provides the initial position of the upper 9 and lower 13 pistons at the extreme points, when the volume in the single stabilizing chamber 25 is minimal, and the air volume between the upper 9 and lower 13 pistons is maximum, and also creates the initial force of movement of the upper 9 and lower 13 pistons for reliable operation of their o-rings.

The proposed packer with a cable entry was manufactured industrially at the Izmeren factory and the pilot tests determine, according to the applicant, its compliance with the criterion of “industrial applicability”.

Claims (1)

A packer including a shaft, upper and lower sub connected to the shaft, upper and lower brackets located at the ends of the shaft, mated to the corresponding sub, a pipe fixed in the upper and lower brackets and mounted eccentrically relative to the shaft located inside the pipe, an anchor and a sealing an element placed on the pipe, a cable channel located between the shaft and the pipe, and a cable whose cross-section corresponds to the eccentricity of the shaft and pipe, stationary in the cable channel, connected connected with its upper and lower ends with upper and lower electrical connectors mounted respectively on the upper and lower brackets in the presence of a stabilizing chamber filled with non-conductive fluid, characterized in that a single stabilizing chamber is formed between the upper and lower electrical connectors, shaft and pipe on the upper a sleeve is made to the bracket, forming together with the upper bracket a compensation cavity and having an annular hole connecting the compensation cavity to the outer space and a self-regulating pressure compensator is placed, consisting of two pistons, respectively upper and lower, with o-rings and a spring installed between the upper and lower pistons, located in the compensation cavity, connected to a single stabilizing chamber with a hole made in the upper bracket and connecting a single a stabilizing chamber with an over-piston cavity of the upper piston, and the under-piston cavity of the lower piston is communicated with an annular hole to fill the compensation cavity wellbore fluid, the air left between the upper and lower piston acts as an additional spring and a single stabilizing chamber is filled with non-conductive fluid.