RU2799306C1 - Device for expanding pipes in a well - Google Patents

Abstract

FIELD: expanding pipes in a well.

SUBSTANCE: device includes housing with a central channel and threads for connection with downhole equipment and recesses on the outer surface. In the recesses there are rollers equipped with chamfers at the top and bottom and mounted on axles fixed in the upper and lower grooves of the housing recesses at an angle to the central axis. The lower groove of the housing recess is made of a rectangular section with a bushing with an inner conical surface fixed rigidly from the outside. The upper groove of the housing recess is made of a rectangular section with an inclined thrust plane inside and a bushing screwed on the outside on the left-hand thread, secured with screws and a retaining ring. The axis is equipped with a square shank from below, which is installed in the lower groove of the housing recess. From above is is equipped with a prismatic end with chamfers inserted into the upper groove of the housing recess. The axis is symmetrical about the central axis. There are five housing recesses with grooves according to the number of axes and rollers. The housing is made of structural alloy steel.

EFFECT: creating a simple-to-manufacture, reliable design, a significant increase in device performance, an increase in the efficiency of pipe expansion due to the five-roller design and the duration of the flare at high torques due to the strengthening of the body.

1 cl, 4 dwg

Description

The invention relates to the field of drilling wells and is intended, in particular, for the expansion of shaped pipes when they are installed in a well to isolate zones of complications.

A device for expanding pipes is known (patent RU No. 46527, IPC E21 B 29/10, publ. 10.07.2005, Bull. No. 19), including a housing with a central channel, threads for connection with downhole equipment and recesses on the outer surface, in which rollers mounted on axles are placed. The lower and upper ends of the axles are rigidly fixed in the body, while the axis is located parallel or with a slight deviation from the parallelism of the central axis of the body. The rollers are made in stacks of cylinders installed successively expanding upwards and steplessly one above the other, equipped with chamfers at the bottom and top.

The disadvantages of this device are:

- the impossibility of expanding six-beam profile pipes due to the multiple number of axles and rollers equal to three, as a result of jamming and vibration in the hollows of the profile pipes;

- low torsional strength of the body, as a result, the creation of an emergency situation in case of breakage of the body in the well during flaring;

- the possibility of loosening and unscrewing the bolts on which the axles are fixed during flaring due to jamming and vibration, as a result, the creation of an emergency;

- low resource due to wear of the axles and rollers, since the axles are parallel or with a slight deviation from the parallelism of the central axis of the body, the rollers slip relative to the inner surface of the expandable pipe when the device is fed with rotation downwards.

The closest in technical essence and the achieved result is the "Device for expanding pipes" (patent RU No. 60597, IPC E21 B 29/10, publ. 27.01.2007, Bull. No. 3), including a housing with a central channel, threads for connections with downhole equipment and recesses on the outer surface, in which rollers are placed, equipped with chamfers at the top and bottom and mounted on axles that are rigidly fixed in the housing. The axles are fixed in the upper and lower grooves of the housing recesses at an angle to the central axis by means of pins placed along the horizontal chords of the outer surface of the housing, and the rollers are made in the form of truncated cones expanding upwards with cylindrical upper and lower bases.

The disadvantages of this device are:

- the impossibility of expanding six-beam profile pipes due to the multiple number of axles and rollers equal to three, as a result of jamming and vibration in the hollows of the profile pipes;

- low torsional strength of the body, as a result, the creation of an emergency situation due to the breakage of the body in the well during flaring;

- low resource of axles, since the axles are not symmetrical about the central axis, which excludes their reuse;

- the possibility of the axles and rollers falling out if the pins are damaged or fall out from vibration during flaring, as a result, an emergency situation is created.

The technical objectives of the invention are the creation of a simple-to-manufacture, reliable design due to reliable fastening of the axes, which prevents them from falling out, a significant increase in device performance due to the fact that the axes are symmetrical about the central axis, the efficiency of pipe expansion due to the five-roller design and the duration of the expander at high torques due to the strengthening of the body.

Technical problems are solved by a device for expanding pipes in a well, including a body with a central channel, threads for connection with downhole equipment and recesses on the outer surface, in which rollers are placed, equipped with chamfers at the top and bottom and mounted on axes fixed in the upper and lower grooves of the recesses body at an angle to the central axis.

What is new is that the lower groove of the housing recess is made of a square section with a bushing with an inner conical surface fixed rigidly from the outside, and the upper groove of the housing recess is made of a rectangular section with an inclined thrust plane inside and a sleeve screwed on the left-hand thread, secured with screws and a retaining ring, the axis from below it is equipped with a square shank installed in the lower groove of the housing recess, and from above - with a prismatic end with chamfers inserted into the upper groove of the housing recess, while the axis is made symmetrical relative to the central axis, and the recesses of the housing with grooves are made in the amount of five for the number of axles and rollers , and the body is made of structural alloy steel.

In FIG. 1 shows the assembled device.

In FIG. 2 - section A-A.

In FIG. 3 - section B-B.

In FIG. 4 - axis.

A device for expanding pipes in a well includes a housing 1 (Fig. 1) with a central channel 2, threads 3, 4 for connection with downhole equipment (not shown in Fig.) and recesses 5 on the outer surface 6, in which rollers 7 are placed, equipped with top and bottom with chamfers 8, 9 and mounted on axes 10, fixed in the upper groove 11 and the lower groove 12 (Fig. 1, 2, 3) of the recesses 5 of the body 1 at an angle α to the central axis of the flare 13.

The lower groove 12 of the recess 5 of the body 1 is made of a rectangular section with a bushing 14 fixed externally with an inner conical surface 15, and the upper groove 11 of the recess 5 of the body 1 is made of a rectangular cross section with an inclined thrust plane 16 inside and screwed on the outside on the left thread 17 by a sleeve 18 fixed screws 19 and a retaining ring 20. The axis 10 (Fig. 1, 4) is equipped with a square shank 21 from below, installed in the lower groove 12 of the recess 5 of the housing 1. From above, the axis 10 is equipped with a prismatic end 22 with chamfers 23, inserted into the upper groove 11 of the recess of the housing 13. The axis 10 is made symmetrical about its central axis 24. The recesses 5 of the body 1 with grooves 11, 12 are made in the amount of five for the number of axles 10 and rollers 7. The body 1 is made of structural alloy steel.

The device works as follows.

Expandable shaped six-beam pipes with a drilling shoe (not shown in Figs. 1-4) are lowered into the well in the installation interval on a pipe string (not shown in Fig. 1-4), on which the interval is drilled with zones of complications (absorption, shedding) . After opening the zones of complications, excess pressure is created, pre-pressing them against the walls of the well (not shown in Fig. 1-4). The assembled device is connected to the drill string (not shown in Figs. 1-4) by means of thread 3 (Fig. 1) of the body 1 and lowered into the well up to the installation interval of expandable pipes. In this case, the pipe string is filled with downhole fluid through the central channel 2 of the housing 1. When the device reaches the upper end of the expandable pipes, the drill string begins to rotate while creating an axial load and flushing the cavity of the pipes and the device by pumping fluid. The rollers 7, rotating in the recesses 5 of the housing 1 on the axes 10, interact with the expandable pipe, which is expanded along its entire length. Due to the fact that the upper groove 11 and the lower groove 12 are made of rectangular section, and the axes 10 are provided with square shanks 21 and the top with prismatic ends 22, rotation of the axes 10 during the flaring process is excluded. Due to the fact that the upper groove 11 with an inclined thrust plane 16 inside, on which the axis 10 is supported by the plane 25, a decrease in diameter during flaring due to their collapse is excluded. Thanks to the bushing 14 rigidly fixed from the outside with an inner conical surface 15 and the bushing 18 screwed on the outside on the left thread 17, fixed with screws 19 and the retaining ring 20, the axes 10 with the rollers 7 in the well are prevented from falling out during flaring, and when the bushing 18 is dismantled, the axes 10 are removed with 7 rollers for replacement. Due to the fact that the axis 10 is made symmetrical about its central axis 24, the resource of the axles 10 is doubled due to the possibility of installation with the non-worn part up. Due to the number of recesses 5 of the body 1 in the amount of five for the number of axles 10 and rollers 7, wedges and shock loads are excluded when rolling six-beam profile pipes.

At the end of the flaring, the drilling shoe is turned away from the lower end of the profile pipes. Due to the fact that the body 1 is made of structural alloy steel, the breaking of the body 1 when the drilling shoe is turned off is excluded. After the drill shoe is turned off, the fluid supply is stopped, the device is removed from the well.

The proposed design of a device for expanding pipes in a well is easy to manufacture, reliable in operation due to reliable fastening of the axes, preventing them from falling out, providing a significant increase in performance due to the fact that the axes are symmetrical about the central axis, the efficiency of pipe expansion due to the five-roller design and duration operation of the flare at high torques due to the reinforced body.

Claims (1)

A device for expanding pipes in a well, including a housing with a central channel, threads for connection with downhole equipment and recesses on the outer surface, in which rollers are placed, equipped with chamfers at the top and bottom and mounted on axes fixed in the upper and lower grooves of the housing recesses at an angle to the central axis, characterized in that the lower groove of the housing recess is made of a rectangular section with a bushing with an inner conical surface fixed rigidly from the outside, and the upper groove of the housing recess is made of a rectangular section with an inclined thrust plane inside and a sleeve screwed on the outside on the left-hand thread, fixed with screws and a locking ring, the axis is equipped with a square shank from below, installed in the lower groove of the housing recess, and from above - with a prismatic end with chamfers inserted into the upper groove of the housing recess, while the axis is made symmetrical relative to the central axis, and the recesses of the housing with grooves are made in the amount of five according to the number axles and rollers, and the body is made of structural alloy steel.

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