RU2459066C1 - Device for extending tubes in well - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: device includes housing with central channel, threads for connection with downhole equipment and recesses on the external surface in which there are rollers with axes with possibility of restricted radial movement, hydraulic annular piston inserted into housing central channel with possibility of longitudinal movement downwards and spring-loaded upwards. The piston is equipped with outer conical surface expanding upwards and interacting with rollers from inside that are equipped with extending and calibrating outer surfaces. Annular piston is assembled and consists of lower thrust bushing leaning on a spring and upper conical shaft inserted into housing central channel with possibility of rotation. Shaft conical surface consists of two areas, the lower one is done with the possibility of interaction with extending roller surface and the upper area done with large angle interacts with calibrating surface of roller in piston lower end position. Conical shaft is equipped with changeable head with calibrated hole.

EFFECT: increase of reliability, working efficiency, service life.

3 cl, 3 dwg

Description

The proposal relates to the drilling and overhaul of wells and is intended, in particular, to expand the pipes when they are installed in the well.

It is known “Device for expanding pipes in a well” (RF patent No. 2392415, IPC E21B 29/10, publ. Bull. No. 17 dated 06/20/2010), including a housing with a central channel, threads of the connection with the downhole equipment and recesses on the outside the surfaces in which the rollers are mounted on the axles, the lower ends of which are mounted in supports placed in the hinges in the housing with the possibility of turning them in a plane passing through the longitudinal geometric axes of the housing and rollers, and the upper ends are fixed in the radial grooves of the housing In the case of a limited outward movement, and in the central channel of the housing an axially spring-loaded hydraulic annular piston with a pusher having an outer conical surface is placed, the rollers on the outer surface are equipped with samples, and the pusher is placed below the piston with the possibility of rotation and interaction from the inside with the outer surface of its rollers conical surface having protrusions under the sample rollers.

The disadvantages of this device are:

- low quality of expandable pipes, since the rollers of the device are equipped with selections - protrusions are formed on the inner surface of the expandable pipes, in addition, it is possible to bite the rollers and pusher and, as a result, jam them;

- the complexity of manufacturing and high metal consumption due to the presence of mating parts, which are presented with high manufacturing accuracy, such as roller samples, protrusions on the pusher, axles, hinges;

- the rollers of the device have insufficient strength, as they are made with through holes under the axis and have samples that are stress concentrators.

The closest in technical essence and the achieved result is “Device for pipe expansion in the well” (patent PM No. 58155, IPC E21B 29/10, publ. Bull. No. 31 dated 10.11.2006), including a housing with a central channel, threads for connecting with downhole equipment and recesses on the outer surface, in which the rollers with axles are placed, and in the central channel of the housing there is a hydraulic piston spring-loaded in the axial direction, while the rollers are rigidly connected to the axes, the upper and lower ends of which are installed in the housing with the possibility of rotation and limited axial movement, and the piston is made conical with the possibility of interaction with the surface of the rollers.

The disadvantages of this device are:

- the possibility of jamming of the piston in the working position and, as a consequence, the occurrence of an emergency due to the inverse taper of the calibrating surface of the rollers and the small taper of the piston, as well as due to the large length of the rollers contacting the outside with the expandable pipe and clamping the piston in the working position from the inside ;

- slippage of the rollers relative to the inner surface of the expandable pipe when feeding the device with rotation downward, since the rollers are not offset relative to the piston, but are made coaxially with it.

The technical objectives of the alleged invention are to create a reliable and technologically advanced design by eliminating jamming of the device in the working position, as well as increasing the operability of the device, the efficiency of pipe expansion and the duration of the flare before repair.

The technical problem is solved by a device for expanding pipes in the well, including a housing with a central channel, threads for connecting to downhole equipment and recesses on the outer surface, in which rollers with axles with limited radial movement are placed, a hydraulic annular piston inserted into the central channel of the housing with the possibility of longitudinal movement down and spring-loaded upward, while the piston is equipped with an external conical surface, expanding upwards and interacting inside with rollers that are equipped with expanding and calibrating outer surfaces.

New is that the annular piston is made prefabricated, consisting of a lower thrust sleeve, supported by a spring, and an upper conical shaft inserted rotatably into the central channel of the housing, while the conical surface of the shaft is made of two sections, the lower of which is made with the possibility of interactions with the expanding surface of the roller, and the upper, made with a large angle, with the calibrating surface of the roller in the lowermost position of the piston, while inside the conical shaft a replaceable nozzle with cal brovannym hole.

It is also new that the lower section of the conical shaft and the rollers are made and installed in such a way that the central axes of the rollers, the conical shaft and the generators of the expanding surfaces of the rollers and the generators of the conical shaft converge at one point.

It is also new that the recesses of the housing under the rollers are made in such a way that the top of each roller is shifted circumferentially forward along the rotation of the housing relative to the bottom of the roller.

Figure 1 shows the device in its original position;

figure 2 - the device is in the working position;

figure 3 is a fragment of a view A.

A device for expanding pipes in a well (not shown in the diagram), including a housing 1 (see Fig. 1) with a central channel 2, threads 3 and 4 for connecting to downhole equipment (not shown in the diagram) and recesses 5 on the outer surface 6, in which the rollers 7 with the axles 8 are placed with the possibility of limited radial movement. The hydraulic annular piston 9 is inserted into the central channel 2 of the housing 1 with the possibility of longitudinal movement downward and spring loaded upward by the spring 10. The annular piston 9 is assembled, consisting of a lower thrust sleeve 11 supported by the spring 10, and an upper conical shaft 12 inserted into the central channel 2 housing 1 with the possibility of rotation. The conical surface of the shaft 12 is made of two sections, the lower 13 of which is configured to interact with the expanding surface 14 of the roller 7. The upper conical section 15 of the shaft 12 is made with a large angle and interacts with the calibrating surface 16 of the roller 7 in the lowermost position of the piston 9. For create a differential pressure inside the conical shaft 12 has a replaceable nozzle 17 with a calibrated hole 18.

To avoid slippage during rotation of the rollers 7 (see figure 2) relative to the shaft 12, the lower section 13 of the conical shaft 12 and the rollers 7 can be made so that the Central axis 19 of the rollers 7, the Central axis 20 of the conical shaft 12 and forming the expanding surfaces 21 rollers 7 and forming 22 conical shaft 12 converge at one point.

To prevent slipping of the rollers 7 (see figure 3) relative to the inner surface of the expandable pipe (not shown in the drawing) when the device is fed downward with rotation, the recesses 5 of the housing 1 under the rollers 7 are made in such a way that the top 23 of each roller 7 is offset circumference forward along the rotation of the housing 1 relative to the bottom 24 of the roller 7.

The device operates as follows.

Expandable pipes (not shown) are lowered into the well in the installation interval on the pipe string (not shown in FIG.), In which excess pressure is created by first pressing them against the walls of the well or to the casing (not shown). Next, the complete assembly using the threads 3 (see FIG. 1) and 4 of the housing 1 is connected to the downhole equipment and lowered into the well by the pipe string (not shown in FIG.) Up to the installation interval of the expandable pipes. In this case, the pipe string is filled with the borehole fluid through the central channel 2 of the housing 1. When the device reaches the upper end of the expandable pipes, the pipe string (not shown in FIG.) Starts to rotate while creating axial load and flushing the pipe cavity and the device with fluid injection. In this case, under the influence of the differential pressure on the nozzle 17 (see figure 2), the conical shaft 12, acting on the lower thrust sleeve 11 and compressing the spring 10, moves down to the stop, and interacting with the conical surface of the lower section 13 from the inside with the expandable surface 14 of the rollers 7 and displays the rollers 7 in working position. The rollers 7, rotating in the recesses 5 of the housing 1, interact with the expandable pipe, which is extended along the entire length by the calibrating surface 16. Upon reaching the lower end of the expandable pipe, when the rollers 7 exit the pipe, the upper conical section 15 interacting with the calibrating surfaces 16 of the rollers 7 , supports rollers 7 in working position. Due to this, after flaring, there is no local end restriction, which ensures the installation of expandable pipes without contractions and, as a result, the free passage of the drilling tool through the expanded pipes.

At the end of the flaring, the fluid supply is stopped, while the conical shaft 12 with the thrust sleeve 11 rises up to the transport position under the action of the spring 10, while the diameter described around the rollers 7 of the device becomes smaller, which ensures the free exit of the device from the flared pipe. In the event of an emergency, such as a breakdown of the spring 10, jamming of the conical shaft 12 does not occur, since the rollers 7, acting on the expanding surface 14, push the conical shaft 12 into the transport position.

Due to the fact that the lower section 13 of the conical shaft 12 (see figure 2) and the rollers 7 can be made and installed so that the Central axis 19 of the rollers 7, the axis 20 of the conical shaft 12 and forming the expanding surfaces 21 of the rollers 7 and forming 22 conical shaft 12 converge at one point eliminates slippage of the rollers 7 relative to the lower portion of the conical shaft 12.

Due to the fact that the recesses 5 (see Fig. 3) of the housing 1 for the rollers 7 can be made in such a way that the top 23 of each roller 7 is circumferentially displaced forward along the rotation of the housing 1 relative to the bottom 24 of the roller 7, slipping of the rollers 7 against the inner the surface of the expandable pipe (not shown in the drawing) when feeding the device down with rotation.

The proposed design of the device for expanding pipes in the well is a reliable and technologically advanced design by eliminating jamming of the device in the working position, as well as increasing the operability of the device, the efficiency of expansion of pipes and the duration of the flare prior to repair due to the exclusion of sliding between the shaft, rollers and the rolled pipe.

Claims (3)

1. A device for expanding pipes in a well, including a housing with a central channel, threads for connecting to downhole equipment and recesses on the outer surface, in which rollers with axles with limited radial movement are placed, a hydraulic annular piston inserted into the central channel of the housing with the possibility longitudinal movement downward and spring-loaded upward, while the piston is equipped with an external conical surface, expanding upwards and interacting from the inside with rollers, which nabzhany expanding and calibrating the outer surfaces, characterized in that the annular piston is made prefabricated, consisting of a lower thrust sleeve, supported by a spring, and the upper conical shaft inserted into the Central channel of the housing for rotation, while the conical surface of the shaft is made of two sections, the lower of which is made with the possibility of interaction with the expanding surface of the roller, and the upper, made with a large angle, with the calibrating surface of the roller in the lowermost position of the piston, when The volume inside the conical shaft is equipped with a replaceable nozzle with a calibrated bore. 2. A device for expanding pipes in a well according to claim 1, characterized in that the lower portion of the conical shaft and the rollers are made and installed in such a way that the central axes of the rollers, the conical shaft and the forming expansion surfaces of the rollers and forming the conical shaft converge at one point. 3. A device for expanding pipes in a well according to claims 1 and 2, characterized in that the recesses of the housing under the rollers are made in such a way that the top of each roller is shifted circumferentially forward along the rotation of the housing relative to the bottom of the roller.

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