RU2268986C1 - Device for tube expansion inside well - Google Patents

Abstract

FIELD: well drilling and overhaul, particularly to expand items made of profiled pipes.

SUBSTANCE: device comprises body with central channel and conical surface provided with depressions in which rollers are arranged. The rollers are secured by pins having upper ends detachably fixed and lower ends installed in supports. The supports are pivotally located in the body so that the supports may rotate in plane extending through longitudinal geometric axes of the body and the rollers. The lower body part is rigidly connected with technological bush formed with axial channel having cross-sectional area less than that of central channel. Sealed annular cylinder having piston is arranged above technological bush and below roller axes. Cavity arranged under the piston communicates with central body channel above axial channel of technological bush. The pins are provided with inner axial cavities. Bushes are located between the pins and the rollers in air-tight manner. The bushes may rotate relative the rollers and are restricted from rotation relative the pins. Outer bush surfaces are provided with helical grooves and parallel flat areas directed in parallel with plane of pin rotation and communicated with cavity arranged above annular cylinder through inner axial cavities of the pins.

EFFECT: increased working ability and tube expansion efficiency.

2 cl, 6 dwg

Description

The invention relates to drilling and overhaul of wells and is intended, in particular, for expanding devices from shaped pipes when installing them in wells.

It is known "Device for expanding pipes" (RF patent No. 2144128, E 21 V 29/10, publ. Bull. No. 1 of 01/10/2000), comprising a housing with a central channel, threads for connecting to downhole equipment, and conical a surface with recesses in which the rollers are mounted mounted on axles provided with shanks, while the upper ends of the axes of the rollers are detachably fixed in the housing.

Closest to the invention in terms of technical nature and the number of coinciding essential features is the "Device for pipe expansion" (RF patent No. 2191883, E 21 B 29/10, publ. Bull. No. 30 from 10.27.2002), including a housing with a central a channel, threads for connecting to downhole equipment and a conical surface with recesses in which rollers are mounted on axles, the upper ends of which are fixed in the housing detachably, and the lower ones are installed in supports placed in the housing using hinges with the possibility of turning them into a plane passing through the longitudinal geometric axis of the housing and rollers

The disadvantages of the devices are:

firstly, the low efficiency of flaring profile pipes and the insufficient duration of work due to premature wear of the interface between the axis and the roller;

secondly, the complexity of the restoration and manufacture of the axles, since they have a complex geometric shape and require additional machining after heat treatment;

thirdly, high material costs in the process of manufacturing, operation and repair of axes and rollers of flare mills.

The technical task of the invention is to increase the operability of the device, the efficiency of flaring profile pipes and the duration of the flare before repair, reducing costs and time for repair of flaring and, as a result, saving material and financial resources.

The technical problem is solved by a device for expanding pipes in a well containing a housing with a central channel, threads for connecting to downhole equipment and a conical surface with recesses, in which rollers are mounted on axles, the upper ends of which are fixed in the housing detachably, and the lower ends are mounted in supports placed in the housing using hinges with the possibility of rotation in a plane passing through the longitudinal geometric axis of the housing and rollers.

What is new is that the bottom of the housing is rigidly connected to a technological sleeve equipped with an axial channel having a passage section smaller than that of the central channel, while a sealed annular cylinder with a piston is located in the housing above the technological sleeve and below the roller axes, the piston cavity of which communicates with the central channel of the housing is higher than the axial channel of the technological sleeve, the axes being additionally provided with internal axial cavities, and hermetically sealed bushings are located between the axles and rollers with the possibility of rotation relative to the rollers and without the possibility of rotation relative to the axes, while the outer surface of the bushings is provided with helical grooves and parallel flanges oriented parallel to the plane of rotation of the axis and communicating through the internal axial cavity of the axes with the over-piston cavity of the annular cylinder.

New is also the fact that the bushings are made of wear-resistant material and are made removable from the axles along with the rollers.

Figure 1 shows the device in its initial position before the flaring of the profile overlap;

figure 2 - the device in the process of expanding the profile overlap;

figure 3 is an enlarged image of the axis, the sleeve and the roller assembly in figure 1;

figure 4 is a section aa (see figure 1);

figure 5 is a section bB (see figure 1);

figure 6 - section bb (see figure 2).

A device for expanding pipes in a well, including a housing 1 (see FIG. 1) with a central channel 2, threads 3 and 3 'for connecting to downhole equipment (not shown), and recesses 4 on the outer conical surface 5 in which the rollers are placed 6 mounted on the axles 7. The upper ends 8 of the axles 7 are fixed in the housing 1 detachably by means of a sleeve 9, and the lower 10 are mounted in the supports 11 placed in the housing 1 by means of hinges 12 with the possibility of rotation in the plane F (see FIG. 4) passing through the longitudinal geometric axis of the housing 1 and the rollers 6 At the bottom, the housing 1 (see Fig. 1) is rigidly connected by means of a thread 3 'to the technological sleeve 13, equipped with an axial channel 14 having a cross section d1 less than d2, at the central channel 2. Above the technological sleeve 13 and below the axes 7 rollers 6 in the housing 1 there is a sealed annular cylinder 15 with a piston 16, the piston cavity 17 of which communicates with the central channel 2 of the housing 1 above the axial channel 14 of the process sleeve 13. The axles 7 are additionally provided with internal axial cavities 18. Between the axles 7 (see figure 3) and the rollers 6 are bushings 19 installed hermetically (due to seals 20) rotatably relative to the rollers 6 and without the possibility of rotation relative to the axes 7. The outer surface 21 of the bushings 19 is provided with helical grooves 22 and parallel flanges 23. The flats 23 are oriented parallel the rotation plane F (see FIG. 4) of the axis 7 and communicate through the internal axial cavity 18 (see FIG. 3) of the axles 7 with a supra-piston cavity 24 (see FIG. 2) of the annular cylinder 15 (see FIG. 1) due to channels 25 and 26 (see figure 3). The bushings 19 to ensure manufacturability of the design can be made of wear-resistant material and made removable with the axles 7 together with the rollers 6.

The device can be used to install profile shutoffs 27 in an open wellbore 28 (see Figs. 1 and 2) in a previously enlarged 29 (expanded) wellbore 28 (in flush), without first increasing the diameter of the wellbore 28 (followed by a reduction in the bore borehole) (not shown), when repairing casing strings (not shown), when expanding smooth pipes (not shown).

The device operates as follows (for example, installing a profile overlap flush):

The profile shutter 27 is lowered on the pipe string 30 (process not shown) to the previously extended interval 29 (for example, the absorption zone) of the well 28 and expanded by creating internal hydraulic pressure until their walls are pressed against the wall of the extended interval 29 of the well 28 (see Fig. 1) . Then the pipe string is removed and with the help of a thread 3, an assembled device is attached to it and lowered into the well 28, having previously filled the over-piston cavity 24 of the annular cylinder 15 with lubricant. When the device reaches the upper end of the profile overlap 27, the pipe string begins to rotate while simultaneously creating an axial load and flushing the cavity of the pipe string 30 and the device through the central channel 2 of the housing 1 by fluid injection. In this case, the rollers 6 with axles 7 provided with bushings 19 diverge up to the stop of the upper ends 8 of the axles 7 into the bush 9. Moreover, the axles 7 (see FIG. 2) rotate due to the hinges 12 relative to their lower ends 10 installed in the supports 11, the rollers 6 are withdrawn from the recess 4 of the outer conical surface 5 in the plane F (see FIG. 4), bringing them into working position, for example, due to the hydraulic pusher 31 spring-loaded from below (see FIG. 2). As a result, the device, passing through the profile shutter 27 (see Fig. 5), straightens its residual deformation 32 until the profile shutter 27 is pressed against the walls of the extended interval 29 of the well 28. Moreover, due to the fact that the sleeve 13 has a cross section d1 of the axial channel 14 less than the cross section d2 of the central channel 2, above the axial channel 14 of the process sleeve 13 a pressure differential is created relative to the internal space of the well 33. This pressure differential is transmitted to the piston cavity 17 of the annular of the cylinder 15, pushes the piston 16. The lubricant due to the channels 25 and 26 is transmitted from the supra-piston cavity 24 through the axial cavity 18 to the flats 23 (see Fig. 4) of the bushings 19, of which the lubricant extends along the screw grooves 22 along the outer surface 21 bushings 19 due to the rotation of the rollers 6. The presence of a tight fit due to the seals 20 of the rollers 6 on the sleeve 19 prevents the ingress of foreign substances between them, which can cause increased wear of the rollers 6 and the bushings 19 at their places of contact during operation (on the outer surface of the 21 bushings 19). Further reducing wear is the manufacture of bushings 19 from a wear-resistant material. At the end of the expansion of the profile overlap 27 (see figure 2), the washing is stopped and the device returns to its original state (see figure 1). Next, the device is removed from the well 28.

In case of wear of the rollers 6 and the bushings 19 more than acceptable, they are removed from the axles 7 and replaced with usable. After that, the device is ready for subsequent operation.

Below, additional equipment can be attached to the device (for example, an additional device for preliminary flaring of pipes), and above - an engine for rotating the device, when using the device at great depths,

The described improvements increase the efficiency of expansion and the life of the axles, bushings and rollers without replacement. In addition, they allow the manufacture of bushings at the lowest cost and quickly replace them if they are worn or broken by new, usable ones. As a result, the quality and reliability of the installation of profile pipes in wells is increased, which ensures the free passage of the drilling tool through profile shutoffs during subsequent drilling of wells, and as a result, savings in material and financial resources.

Claims (2)

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 conical surface, in which rollers are mounted on axles, the upper ends of which are fixed in the housing detachably, and the lower ones are mounted in supports placed in the housing using hinges with the ability to rotate them in a plane passing through the longitudinal geometric axis of the housing and rollers, characterized in that the bottom of the housing is rigidly connected to the technological a sleeve equipped with an axial channel having a passage section smaller than that of the central channel, wherein a sealed annular cylinder with a piston is located in the housing above the process sleeve and below the roller axes, the piston cavity communicating with the center channel of the housing above the axial channel of the process sleeve, the axis additionally equipped with internal axial cavities, and between the axles and rollers there are bushings installed hermetically rotatably relative to the rollers and without rotations relative to the axes, the outer surface of the bushings provided with helical grooves and parallel flats oriented parallel to the plane of rotation of the axis and communicating through the internal axial cavity of the axes with the over-piston cavity of the annular cylinder. 2. The device for expanding pipes in the well according to claim 1, characterized in that the bushings are made of wear-resistant material and are made removable from the axes along with the rollers.

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