RU2387801C1 - Pipe flaring device - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: device includes a body with the centre passage, downhole equipment thread, and primary and upstanding additional recesses on an external surface wherein there are main and additional rollers respectively. The additional rollers are parallel or slightly deviated from the parallelism to the central axis of the device. The rollers rotate on the main and additional axes respectively. An upper end of the main axis is detachably connected at an angle to a lower end of the additional axis. The lower end of the main axis is arranged in a hinge and turns in a plane passing through the longitudinal geometrical axes of the body and the main and additional rollers. The upper end of the additional axis is detachably fixed in the body.

EFFECT: improved flaring efficiency and reliability, lower material inputs.

1 dwg

Description

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

A device for expanding pipes is known (RF patent No. 2191883, ЕВВ 29/10, publ. Bulletin No. 30 of 10/27/2002), including a housing with a central channel, threads for connection with downhole equipment and recesses on the outer surface, in which placed rollers mounted on axes, the upper ends of which are fixed in the housing detachably, the lower ends of the axes of the rollers mounted in bearings placed in the housing using hinges with the possibility of rotation in a plane passing through the longitudinal geometric axes of the housing and rollers, for echeniya extraction of hinges and replaced.

The disadvantages of this device are:

- low quality flared pipes, since the rollers of the device are equipped with narrow calibrating sections;

- the inability to perform the required internal diameter of the flared pipes with large axial feeds of the tool, because in this case, the rollers form a helical groove in the pipe body with a step greater than the size of the calibrating section of the roller, which may require the descent of an additional calibrating tool.

Closest to the proposed technical essence is a device for expanding pipes (RF patent for utility model No. 55851, ЕВВ 29/10, publ. Bulletin No. 24 of 08/27/2006), including a housing with a central channel, threads for connecting to downhole equipment and recesses on the outer surface, and the housing is equipped with additional recesses for additional rollers located above the recesses, with additional rollers installed in parallel or with a slight deviation from parallelism to the central axis of the device va rotatably, wherein the additional recesses above the housing is equipped with an annular sample for sealing engagement with the flared tubes.

The disadvantages of this device are:

- increased wear of the recesses in which the rollers are placed when working with high axial and radial loads, and frequent replacement of worn-out housings with new ones will be inevitable, resulting in large material and time costs;

- a high probability of jamming of the rollers when the well cuttings get into the recesses in which the rollers are placed, which can lead to damage to the device and pipes being expanded by it.

The technical task of the invention is to increase the reliability and performance of the device for expanding pipes in the well by eliminating the loads directly on the device body and eliminating the likelihood of jamming of the rollers during its operation, as well as saving material costs due to an increase in the resource of the housing.

The technical problem is solved by a device for expanding pipes in a well, including a housing with a central channel, threads for connecting to the downhole equipment and the main and additional recesses located above on the outer surface, in which the main and additional rollers are respectively placed, with additional rollers installed in parallel or with a small deviation from parallelism to the central axis of the device.

What is new is that the rollers are rotatably arranged respectively on the main and additional axes, the upper end of the main axis being connected at an angle to the lower end of the additional axis by a detachable connection, the lower end of the main axis is pivotally rotatable in a plane passing through longitudinal geometrical the axis of the housing and the primary and secondary rollers, and the upper end of the secondary axis is detachably fixed in the housing.

The drawing shows a device for expanding pipes in a well with an axial section.

A device for expanding pipes consists of a housing 1 with a central channel 2, threads 3 for connecting with downhole equipment and the main 4 and, placed above, an additional 5 recesses on the outer surface, which respectively contain the main 6 and 7 additional rollers. Moreover, the additional rollers 7 are installed in parallel or, in order to prevent slippage, with a slight deviation from parallelism to the central axis of the device.

The rollers 6 and 7 are rotatably disposed on the main 8 and additional 9 axes, respectively, the upper end 10 of the main axis 8 being connected at an angle to the lower end 11 of the additional axis 9 by a releasable connection 12 (for example, threaded or notch-ledge), lower end 13 the main axis 8 is placed in the hinge 14 with the possibility of rotation in a plane passing through the longitudinal geometric axes of the housing 1 and the main 6 and additional 7 rollers, and the upper end 15 of the additional axis 9, thanks to the removable sleeve 16, is detachably fixed in the housing 1.

The device operates as follows.

Profile pipes 19 are lowered into the interval 17 of the leakage zone of the casing string 18 of the well and expanded by creating internal hydraulic pressure until their walls are pressed against the wall of the casing string 18. Then the device is connected to the drill string (not shown) by threads 3 of the casing 1, in composition with which lowered into the well. When the device reaches the upper end of the profile pipes 19, the drill pipe string begins to rotate, creating an axial load at the same time and flushing the internal cavity of the pipe and device by pumping liquid through the central channel 2 of the device body 1.

As a result, the main rollers 6, installed in the recesses 4 of the housing 1, expand sections of the profile pipes 19 that were not pre-hydrated to press them firmly against the walls of the casing 18. Moreover, the additional rollers 7 installed in the recesses 5 of the housing 1, due to the specially selected length of the calibrating section exceeding the difference between the pitch of the helical groove in the pipe body and the length of the calibrating section of the main roller 6, calibrate and "smooth" to the required diameter previously expanded by rollers 6 prof flax pipe 19.

In this case, the loads perceived by the rollers 6 and 7 are transmitted to the housing 1 through the axes 8 and 9, which eliminates the wear of the recesses 4 and 5 of the housing 1, and also reduces the likelihood of jamming of the rollers 6 and 7 in them.

After completion of the operation, the complete assembly is removed from the well. After that, the parts of the device are revised and, if necessary, the worn rollers 6, 7 and axles 8, 9 are replaced. To do this, unscrew the sub 20 and the removable sleeve 16, raise the additional axis 9 along with the main axis 8 around the hinge 14 for the upper end 15. Then the lower end 11 of the additional axis 9 is removed via a detachable connection 12 from the upper end 10 of the main axis 8 and, together with the roller 7, the axis 9 is separated from the axis 8. Next, the main axis 8 with the roller 7 is removed, separating its lower end 13 from the hinge 14 The assembly of the device is performed in the reverse order. lnosti.

Due to the elimination of loads when working directly on the housing, the proposed device allows reliable and trouble-free flaring of profile pipes, avoiding the high material costs associated with wear and replacement of the housing, as well as reducing the likelihood of jamming of the rollers in the recesses of the housing. In addition, due to the increased calibrating surfaces of the additional rollers, the required diameter of the expandable pipes is provided even with large axial feeds of the tool.

Claims (1)

A device for expanding pipes in a well, including a housing with a central channel, threads for connecting to the downhole equipment and the main and additional upper recesses located on the outer surface, in which the main and additional rollers are respectively placed, with additional rollers installed in parallel or with a slight deviation from parallelism to the Central axis of the device, characterized in that the rollers are placed with the possibility of rotation, respectively, on the main and additional axes, In fact, the upper end of the main axis is connected at an angle with the lower end of the additional axis by a detachable connection, the lower end of the main axis is pivotally rotated in a plane passing through the longitudinal geometric axes of the housing and the main and additional rollers, and the upper end of the additional axis is fixed in the casing .