RU2529460C2 - Flushing device - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to mining industry and is designed for restoring the permeability and capacity of the perforation channels in the boring casing. The device comprises a housing with a channel for supplying fluid, a cylinder with the annular chamber and tangentially directed channels. The housing is provided with a connecting nipple with a bottom in the axial channel with a through hole, with grooves on the inner surface. The cylindrical bore is made perpendicular to the axis of the nipple in the housing, in which a cup with a head and a cap is placed. The bore is covered with the bottom in which the drain pipe is fixed provided with a ledge and radial holes made with the ability to provide a hydraulic connection of the longitudinal channels on the cap with the axial channel of the drain pipe in the initial position. The cup forms an annular chamber with a drain pipe in which the spring with the support on the ledge is mounted. The cylinder is rigidly connected with a connecting nipple provided with the adapter. The adapter is provided with longitudinal grooves and the bypass holes connecting the cylinder annular chamber with its axial channel in which the piston and fasteners are mounted.

EFFECT: increased cleaning efficiency.

2 dwg

Description

The invention relates to the mining industry and is intended to restore the permeability and throughput of perforation channels in the casing of production wells.

A device for washing a well is known (see US Pat. RF No. 2047740, M class E21B 37/00, publ. 10.11.95, bull. No. 31). It consists of a hollow body, with inlet and annular channels, a tip with an axial channel, a hydrodynamic pulse generator in the form of a consecutively placed confuser, a critical serial hole and a diffuser, installed coaxially with the tip in the body.

The device as part of the tubing string is introduced into the well, the working fluid is supplied with washing of the sand plug. This ensures a direct exposure to a jet of working fluid with the removal of pulp. In this case, the jet of the working fluid in the device is twisted in a spiral, with an increase in the flow rate.

There is a direct, constant effect of a jet of working fluid on the sediment in the axial channel of the well. The impact on the sediment on the wall of the casing pipe around the perimeter is not performed.

Known design nozzles (see AS No. 732505, M class. E21B 43/144, publ. 5.04.80, bull. No. 17).

The nozzle consists of a housing with an axial channel for supplying fluid, a cylinder with an annular chamber, which is hydraulically connected by openings in the body of the housing with its axial channel. At the end of the nozzle, a nozzle channel is made with a tangential angle of inclination to the axis of rotation.

When a working fluid is supplied under pressure, the latter, through the axial channel of the housing and the radial holes in its body, enters the annular chamber of the cylinder. When the fluid flows from the nozzle channels of the cylinder, the latter rotates around the axis of the housing. This allows you to close the force of fluid pressure inside it, without transmission to the supporting elements.

A necessary condition for rotation is the choice of such a tangential inclination of the jet relative to the axis of the nozzle so that this component exceeds the friction force at the point of contact of the cylinder with the shoulder of the housing. The jet from the nozzle channel sequentially passes around the circumference with the impact on the barrier and its destruction.

The disadvantages of the design include:

- the distance from the nozzle channel to the barrier is unchanged and this condition cannot always ensure the effective destruction of the barrier;

- the direction of orientation of the device depends on the installation conditions on the inlet pipe. In the case of installing the device on the lower end of the flexible pipe string of the coiled tubing unit, the fluid stream can be directed only to the bottom of the well and cannot change its position for processing the walls of the well.

A device for washing wells (see. "Reference manual on the gas-lift method of operating wells." Yu.V. Zaitsev, R. A. Maksutov, O. V. Churbanov and others - M .: "Nedra", 1984, p.210-211.), adopted as a prototype.

The device consists of a sub, a pipe, a saddle on shear pins in the axial channel. A casing with a flushing mill is connected to the sub. The nozzle has a plug at the end and is equipped with side openings for supplying flushing fluid.

The device can rotate around its axis with a string of pipes.

Disadvantages. The device cannot rotate independently, which makes it impossible to use this device as part of a flexible pipe string.

The flow of flushing fluid acts on the barrier through the side openings, but the effectiveness of the impact is low due to the sufficiently large and constant distance to the barrier.

A patent search showed that a technical solution is known that implements the principle of creating torque by tangentially delivering a jet of working fluid (see “Experience in the destruction of sand-clay plugs using hydroshock devices as part of the KGT.” Bulletin of the North Caucasian State Technical University Series “Oil and Gas”, No. 1 (4), 2004, pp. 86-90), the hydraulic shock device is equipped with a hydraulic monitor nozzle with tangential channels, mounted with the possibility of rotation of the flowing stream p liquid.

The well-known article "Destruction of rocks by a rotary jet stream" Auth. N.I. Andrianov, A.I. Mishchenko, M.G. Geichman. Sat scientific works “Construction of gas and gas condensate wells”. Moscow, 1997, pp. 59-63.

This article describes the technology of rock destruction by a rotary jet of a working fluid. The design of the device is not presented. Nevertheless, there is a process of impact on the rock during rotation around the entire perimeter of the mine.

The technical result that can be obtained by implementing the invention is as follows:

- the possibility of using this device as part of a flexible pipe string;

- the possibility of transmitting torque to the nozzle, with the location of the throttling channel in the direction of the borehole wall;

- the possibility of separation in time of the torsion of the cylinder with the annular chamber, followed by the supply of pressurized working fluid through the throttling channel of the nozzle to the barrier;

- the possibility of approaching the glass with the nozzle to the barrier in the process of processing the walls of the well;

- the ability to return the glass with the nozzle to its original position for extraction from the well.

The technical result is achieved by the fact that the device is equipped with a housing with a channel for supplying liquid, a cylinder with an annular chamber and tangentially directed channels, the housing is equipped with a connecting nipple with a bottom with a through hole with grooves on the inner surface. In the housing, perpendicular to the axis of the connecting nipple, a cylindrical bore is made with a cup in it with a nozzle and a lid, blocked by a bottom on the bottom, in which a drain pipe with a protrusion and radial holes is fixed with a bolt, with the possibility of providing hydraulic connection of the longitudinal channels on the cover with the axial channel of the drain tube in the starting position.

The glass forms an annular chamber with a drainage tube in which the spring is placed, resting on a protrusion of the drainage tube. The cylinder is rigidly connected to the connecting nipple, equipped with an adapter with an annular protrusion included in its axial channel, blocked by a lock nut. The adapter is equipped with longitudinal grooves on the inner surface and bypass holes connecting the annular chamber of the cylinder with its axial channel, in which the piston is installed, spring-loaded relative to the bottom, and the clamps, which are pressed by the spring ring on the outside of the adapter.

The design of the device is illustrated by drawings, where:

- figure 1 - device in section, in the initial, transport position;

- figure 2 is a device in section, in the position of supply of the working fluid to the processing surface.

The device consists of a housing 1, with a connecting nipple 2, with a bottom 3 and a through hole 4, inside which a number of grooves are made 5. An adapter 7 with an annular protrusion 8 is inserted inside the axial channel 6 of the connecting nipple 2, the stroke of which is limited by a lock nut 9.

On the outside of the connecting nipple 2, a thread is made on which the cylinder 10 is screwed, with the formation of a movable connection with the adapter 7. Inside the cylinder 10, an annular chamber 11 is made, constantly hydraulically connected bypass holes 12 with the axial channel 13 of the adapter 7 and tangential channels 14 with the well cavity . In the axial channel 13 of the adapter 7, a piston 16 is mounted on the spring 15, below the level of the bypass holes 12. In the body of the adapter 7, under the piston 16, a series of longitudinal grooves 18 are made, hydraulically connected to the cylindrical bore 19 made in the housing 1, perpendicular to the axis of the connecting nipple 2. In the body of the adapter 7, holes are made in which the latches 20 are installed with the bevels 21 facing the piston 16, covered externally by a spring ring 22. A drainage tube 23 with a protrusion 24 is mounted axisymmetrically inside the housing 1, fixed in the bottom 25 by a bolt 26. A cup 27 is inserted into the cylindrical bore 19 to form an annular chamber 28 with a drainage tube 23, in which a spring 29 is installed, resting on a protrusion 24 and a cover 30 of the cup 27. Longitudinal channels 31 are made on the outer end surface of the cover 30. , to ensure hydraulic connection of the cylindrical bore 19, through radial holes 32, in the body of the drainage tube 23, with its axial channel 33. The beaker 27 is equipped with a nozzle 34, covering the drainage tube 23 with the formation of a movable connection between them. In the nozzle 34, a throttle channel 35 is made, hydraulically connected to the axial channel 33 of the drainage tube 23.

The annular gap between the adapter 7 and the cylinder 10 is closed by the sealing ring 36. The annular gap between the housing 1 and the cup 27 is closed by the sealing ring 37, between the bottom 25 and the drain pipe 23 by the sealing ring 38. The annular gap between the drain pipe 23 and the nozzle 34 is closed by the sealing ring 39, and between the drainage tube 23 and the cover 30 of the cup 27 - the sealing ring 40. The annular chamber 28 is hydraulically connected to the cavity of the well through a loose thread in the connection of the nozzle 34 and the cup 27.

The device operates as follows.

The connecting thread on the nozzle 7 of the washing device carries out its mechanical connection with the flexible pipe string of the coiled tubing unit and introduces the device into the well at a predetermined depth.

In a flexible pipe string, the working fluid is supplied under the design pressure and at a predetermined flow rate, at which the flow is fed into the axial channel 13 of the adapter 7 and then through the bypass holes 12 into the annular chamber 11 of the cylinder 10, with the jet of the working fluid ejected through the tangential channels 14 into well cavity. The pressure of the working fluid at the first stage is taken to be less than that necessary for processing the walls of the well, but sufficient to bring the cylinder 10 with the housing 1 into rotation. At this pressure, the piston 16 closes the axial channel 13 of the adapter 7 to supply the working fluid through the longitudinal grooves 18 into the cylindrical bore 19 buildings 1.

This is necessary to obtain guaranteed rotation of the housing 1 relative to the adapter 7.

Raise the pressure of the working fluid to the maximum possible. In this case, while maintaining the rotation of the housing 1 by excess pressure in the axial channel 13 of the adapter 7, the piston 16 is displaced below the installation location of the clamps 20 with the opening of the flow of the working fluid along the longitudinal grooves 18 in the body of the adapter 7 and the grooves 5 in the body of the bottom 3 into the cylindrical bore 19 of the housing one.

Next, the working fluid through the longitudinal channels 31 and radial holes 32 is fed into the axial channel 33 of the drainage tube 23 and then through the throttling channel 35 of the nozzle 34 with a high speed acts on the barrier. At the same time, under the influence of the differential pressure acting on the cover 30 of the cup 27, the latter moves in the cylindrical bore 19 with compression of the spring 29. Thus, the nozzle 34 approaches the surface to be treated, which increases the efficiency of the action of the jet of working fluid on the clogging layer when it flows through the throttling channel 35.

While maintaining the flow of the working fluid, it is possible to move the device along the surface to be processed by moving the flexible pipe, which, when the nozzle 34 rotates together with the housing 1, provides processing of the well walls around the entire perimeter.

After the supply of pressure of the working fluid to the axial channel 13 of the adapter 7 is stopped, the cup 27 together with the nozzle 34 are inserted into the cylindrical bore 19 of the housing 1 by the force of the compressed spring 29. By moving up the flexible pipe string the device is removed from the well.

The necessary separation of the processes of the device’s drive into rotation and the subsequent supply of the working fluid to the nozzle 34 with its extension to the work surface provided by the design of the device improves the reliability of the washing device, as well as the quality of cleaning the treated surface.

Claims (1)

A flushing device comprising a body with a channel for supplying fluid, a cylinder with an annular chamber and tangentially directed channels, characterized in that the body is equipped with a connecting nipple with a bottom in the axial channel with a through hole with grooves on the inner surface, a cylindrical bore is made perpendicular to the axis of the body in which a glass with a nozzle and a lid is placed, covered by a bottom, in which a drainage tube is fixed, provided with a protrusion and radial holes made with the possibility of providing hydraulic communication of the longitudinal channels on the lid with the axial channel of the drainage tube in the initial position, and the glass forms an annular chamber with a drainage tube in which a spring with support on the protrusion is placed, the cylinder is rigidly connected to a connecting nipple equipped with an adapter with an annular protrusion and a lock nut and the adapter is equipped with longitudinal grooves and bypass holes connecting the annular chamber of the cylinder with its axial channel, in which a spring-loaded relative to the bottom piston and retainers, biasing spring ring on the outer side of the adapter.

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