RU2766171C1 - Well pipe expansion device - Google Patents

Abstract

FIELD: mining; drilling of soil or rocks.

SUBSTANCE: invention relates to drilling and repair of wells and is intended, in particular, for expansion and calibration of devices from shaped pipes. Device comprises upper stop and lower stop with a set of molding sectors installed between them with the possibility of limited radial movement by limiters. Upper and lower stops are made integral with the housing. Forming sectors are equipped with spherical working surface and are installed in slots of housing equipped with central channel, in which barrel with radial holes is installed. From above and from below the housing is equipped with adapters forming with the barrel upper and lower hydraulic chambers, in which movable spring-loaded conical pistons are installed with the possibility of limited movement along the barrel towards each other. Conical pistons interact with molding sectors 3 and push the molding sectors outwards when pressure drop is created in the barrel equipped with a nozzle. Adapter is provided with thread from above for connection with drill string.

EFFECT: higher reliability, simplified design, ruled out jamming in inclined and horizontal wells, gradual expansion of pipes.

1 cl, 3 dwg

Description

The invention relates to drilling and workover of wells and is intended, in particular, for the expansion and calibration of devices from shaped pipes.

A device for installing a profile cover in a well is known (RF patent No. 2522360, IPC E21V 29/10, publ. up by mandrel inserts made with the possibility of limited longitudinal movement by means of pushers along the guides, and located below the guides, a cylinder with an annular piston interacting with the pushers and made with the possibility of limited movement upwards with a calibrated load thanks to the regulator, the cylinder is rigidly connected to the lower sub, the housing is outside equipped with a stop, and the regulator is made in the form of a spring installed between the body stop and the annular piston to press it down.

The disadvantages of this device are:

- there are no intermediate positions of the mandrel inserts, as a result, the expansion diameter is not regulated, because of this, a large load when expanding the pipes down, since the device enters the working position until the mandrel inserts stop in the top sub;

- the inability to expand the pipes when lifting the device, since the mandrel inserts take the transport position;

- the complexity of manufacturing dovetail grooves on the body and mandrel inserts of the device, as a result, high material costs in manufacturing.

The closest in technical essence and the achieved result is an adjustable punch (RF patent No. 2390620, IPC E21V 29/10, publ. 27.05.2010, bull. No. 15), containing upper and lower stops with a set of forming sectors installed between them with the possibility of limited radial movement, a diaphragm made of an elastic material installed inside the forming sectors, the cavity of which is filled with an incompressible moving medium, the forming sectors are installed with the possibility of limited movement inward in the radial direction, and the diaphragm cavity communicates with an elastic self-contained compensator, providing a constant support of the medium in the diaphragm directly or through a piston mounted above the diaphragm.

The disadvantages of this device are:

- the constant backwater of the medium does not allow adjusting the force of the forming sectors from the wellhead, which can lead to jamming of the device in inclined and horizontal wells;

- low resource of the device due to the use of a diaphragm made of an elastic material;

- the inability to expand the pipes when the device is working downwards, since the device is not designed for downward expansion.

The technical objectives of the invention are to create a reliable and simple design of a device for expanding pipes in a well, which makes it possible to exclude jamming of the device in deviated and horizontal wells and to gradually expand the pipes by gradually increasing pressure through the drill string, in addition, to expand the pipes as when the device is operating. up as well as down.

Technical problems are solved by a device for expanding pipes in a well, containing upper and lower stops with a set of forming sectors installed between them with the possibility of limited radial movement by limiters.

What is new is that the upper and lower stops are made integral with the body, and the forming sectors are provided with a spherical working surface and are installed in the grooves of the body, equipped with a central channel, in which a shaft with radial holes is installed, while the body is equipped with subs at the top and bottom, forming upper and lower hydraulic chambers with the barrel, in which movable spring-loaded conical pistons are installed with the possibility of limited movement along the barrel towards each other, interacting with the forming sectors and pushing the forming sectors outward when creating a pressure drop in the barrel equipped with a nozzle, and the sub is provided with a thread for connecting with a drill string.

In FIG. 1 shows a device for expanding pipes in a well with an axial section in the transport position.

In FIG. 2 shows a device for expanding pipes in a well with an axial section in the working position.

In FIG. 3 shows a section A-A of a device for expanding pipes in a well.

A device for expanding pipes in a well contains an upper stop 1 (Fig. 1, 2, 3) and a lower stop 2 with a set of forming sectors 3 installed between them with the possibility of limited radial movement by limiters 4, 5. The upper 1 and lower 2 stops are made together with the body 6. The forming sectors 3 are provided with a spherical working surface 7 and are installed in the grooves 8 of the body 6, equipped with a central channel 9, in which the barrel 10 with radial holes 11, 12 is installed. barrel 10 upper 15 and lower 16 hydraulic chambers, in which movable spring-loaded spring 17 conical pistons 18, 19 are installed with the possibility of limited movement along the barrel 10 towards each other. The conical pistons 18, 19 interact with the forming sectors 3 and push the forming sectors 3 out when creating a pressure drop in the barrel 10, equipped with a nozzle 20. The sub 13 is provided with a thread 21 from above for connection to the drill string (not shown in Fig. 1, 2) .

Device for expanding pipes in the well operates as follows.

The device for expanding pipes in the well is connected to the drill string through the thread 21 on the sub 13 and lowered into the well (not shown in Figs. 1, 2). Upon reaching the expandable pipes (not shown in Fig. 1, 2), a pressure drop is created by the flushing liquid due to the nozzle 20, for example, 10 MPa, while the liquid through the holes 11, 12 enters the hydraulic chambers 15, 16 and moves the conical pistons 18, 19 towards each other, pushing out the forming sectors 3, while the device is passed through the drill string through the expandable pipes, increasing their diameter. If, due to the lack of weight of the pipe string, the device cannot be passed through the string of expandable pipes, the pressure is reduced, while the exit force of the forming sectors 3 is reduced, thereby reducing the expansion diameter, which leads to a decrease in the force when expanding the pipes. After the preliminary expansion and exit of the device, the pressure is increased, for example, 15 MPa, and the device is pulled upwards, expanding the pipes even more. Thus, the passage up and down the device through the expandable pipes is carried out until, at a maximum pressure of, for example, 20 MPa, there are no landings and puffs during expansion. After that, when flushing is turned off due to the spring 17, the conical pistons 18, 19 move apart, while the forming sectors 3 move to the transport position and the device is removed. Due to the fact that the output force of the forming sectors 3 is controlled from the wellhead, there is no possibility of the device jamming in directional and horizontal wells. Due to the symmetrical design, including the upper 15 and lower 16 hydraulic chambers, in which the movable conical pistons 18, 19 spring-loaded by the spring 17 and the forming sectors 3 with a spherical working surface 7 are installed, it is possible to expand the pipes, both when the device is up and down. Due to the fact that the parts of the device are made of steel, the resource of the device increases significantly.

The proposed device is a reliable and simple design for expanding pipes in a well, which makes it possible to exclude jamming of the device in inclined and horizontal wells and to carry out a gradual expansion of pipes due to a gradual increase in pressure through the drill string, in addition, to expand the pipes, both when the device is working upwards, and and down.

Claims (1)

A device for expanding pipes in a well, containing upper and lower stops with a set of forming sectors installed between them with the possibility of limited radial movement by limiters, characterized in that the upper and lower stops are integral with the body, and the forming sectors are provided with a spherical working surface and are installed in grooves of the body, equipped with a central channel, in which a shaft with radial holes is installed, while the body is equipped with subs at the top and bottom, forming the upper and lower hydraulic chambers with the shaft, in which movable spring-loaded conical pistons are installed with the possibility of limited movement along the shaft towards each other, interacting with forming sectors and pushing out the forming sectors when creating a pressure difference in the barrel equipped with a nozzle, and the sub is provided with a thread on top for connection with the drill string.

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