RU2392415C1 - Pipe flaring device - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to drilling wells and in particular is intended for flaring profiled pipes and their installation inside wells. The device contains a housing with a central channel, threads for connection to well equipment and indentations on the outer surface wherein rollers are arranged mounted on axles whose lower ends are mounted onto supports arranged in the housing on pivots so that to enable their turning within the plane passing through the longitudinal geometric axes of the housing and the rollers with the upper ends fixed in radial grooves of the housing so that to enable their limited relocations forward. In the housing central channel a hydraulic ring piston is arranged, spring-loaded in the axial direction and having a pusher whose outer surface is conic shaped. The rollers on the outer surface have recesses. The pusher is positioned at the piston bottom so that to enable rotation and interaction inside with the rollers outer surface with its conic surface that has projections to match the rollers recesses.

EFFECT: improved flaring quality, extended useful life of the rollers.

4 dwg

Description

The invention relates to well drilling and is intended, in particular, for flaring profile pipes when installed in wells.

The well-known "Flare pipe" (USSR AS No. 1518995, B21D 39/10, publ. Bull. No. 10 of 04/10/1995), containing a tapered support roller located in the hollow body, and also arranged uniformly around the circumference with the possibility of interacting with the support roller conical rolling rollers with means of keeping them from falling out, while the tops of the cones of the rollers are turned in the same direction as the top of the cone of the support roller, while in order to increase reliability and expand technological capabilities by ensuring the expansion of long pipes about n is equipped with a thrust bearing rigidly fixed in the housing, the support roller is fixed in the housing from axial movement by means of a thrust bearing, the means of restraint from falling out of the rolling rollers are made in the form of thrust bearings with channels, while the supporting roller and thrust bearing are made with longitudinal through grooves in communication with body cavity and thrust bearing channels for supplying a cooling medium.

The disadvantages of this device are:

- the impossibility of obtaining an internal passage channel with a diameter exceeding the nominal diameter of the well when installing profile pipes in the hole due to the inability to rotate the axes with rollers in a plane passing through the longitudinal geometric axes of the housing and rollers;

- rapid wear of the support and rolling rollers during operation of the device due to the slipping of the rollers relative to each other when expanding non-circular or bent pipes, which can cause a decrease in the diameter of the passage channel and impede further passage of the drilling tool below the installation location of the profile pipes.

Closest to the proposed technical essence is the "Device for flaring pipes in the well" (RF patent No. 2235849, E21B 29/10, publ. Bull. No. 25 of 09/10/2004), including a housing with a central channel, threads for connection with downhole equipment and recesses on the outer surface, in which the rollers are mounted on the axes, 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 rotation in a plane passing through the longitudinal g the geometric axes of the housing and rollers, the upper ends of the axes of the rollers are mounted in the housing with a radial clearance, and in the central channel of the housing there is a hydraulic ring piston axially spring loaded and having pushers interacting with the upper ends of the axes of the rollers, while the radial clearance between the housing and the upper ends of the axes of the rollers is approximately equal to the difference between the diameter of the well and the inner diameter of the pipe after its expansion.

The disadvantages of this device are:

- high requirements for manufacturing accuracy and relative position of the pushers and axles of the rollers, because the rollers after putting them into working position should be on the same circumscribed circle;

- the lack of synchronism during the operation of the rollers when expanding non-circular or bent pipes, when some of them can rotate and others slip relative to the expandable pipes, which can lead to uneven wear of the rollers and failure of the device. The technical task of the proposed device is to increase the resource of the rollers, as well as the ability to qualitatively expand non-circular or curved profile pipes by eliminating the slipping of the rollers during operation of the device.

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 downhole equipment and recesses on the outer surface, in which rollers are mounted on axles, the lower ends of which are mounted in supports placed in hinges with the ability to rotate 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 with the possibility of limited movement outward, and in the central channel of the housing there is an axially loaded hydraulic annular piston with a pusher having an outer conical surface.

What is new is that the rollers on the outer surface are equipped with selections, and the pusher is located at the bottom of the piston with the possibility of rotation and interaction from the inside with the outer surface of the rollers with its conical surface having protrusions for the roller samples.

Figure 1 shows a device for expanding pipes in a well in a transport position (section), figure 2 - device when expanding pipes in a well, figure 3 - view A in figure 1, figure 4 - section B- B in figure 2.

A device for expanding pipes in a well (Fig. 1) consists of a housing 1 with a central channel 2, threads 3 for connecting with downhole equipment and recesses 4 on the outer surface, in which conical rolling rollers 5 mounted on axles 6 are placed. the ends 7 of the axles 6 are placed in the hinges 8 installed in the supports 9 so that the axles 6 with the rollers 5 can be deflected from the housing 1 in a plane passing through the longitudinal geometric axes of the housing 1 and the rollers 5, and removed from the hinges 8 if they are replaced. The upper ends 10 of the axles 6 are fixed with a sleeve 11 in the radial grooves 12 of the housing 1 with the possibility of limited movement out. The Central channel 2 of the housing 1 contains a spring-loaded, thanks to the spring 13, a hydraulic annular piston 14 with a pusher 15 having an outer conical surface 16.

In this case, the rollers 5 (Figs. 3, 4) are equipped with longitudinal or offset along the outer surface in order to increase the effect of “screwing in” (introducing the rollers into the distributable pipe along a helical line) at an angle α of the samples 17. 4) is placed with the help of the hollow axis 18 from the bottom of the piston 14 (FIG. 1) coaxially with the central axis of the housing 1 with the possibility of rotation and interaction from the inside with the outer surface of the rollers 5, when they are brought into working position, with their conical surface 16 having protrusions 19 (FIG. .4) for sampling 17 rollers 5.

The device operates as follows.

In the previously expanded interval 20 (FIG. 1) (drilling complication zone) of the well 21, the profile pipes 22 are lowered and expanded by creating internal hydraulic pressure until their walls are pressed against the wall of the extended section 20 of the well 21. Then, the device is connected to the body 3 by threads 3 drill pipe string (not shown), with which it is lowered into the well 21. When the device reaches the upper end of the pipe 22, the drill pipe string begins to rotate while creating axial load and flushing the pipe cavity and device Twa through central passage 2 of the body 1, injection fluid.

In this case, under the influence of a differential pressure, the hydraulic annular piston 14 (FIG. 2), compressing the spring 13, moves downward and, acting through the thrust bearing 23 on the pusher 15, moves it along the hollow axis 18 until its outer conical surface 16 interacts with the outer surface of the rollers 5, putting them in working position. In this case, the protrusions 19 (Fig. 4) on the conical surface 16 (Fig. 2) of the pusher 15 are engaged with the samples 17 (Fig. 4) on the outer surface of the rollers 5 (Fig. 2).

With further rotation of the drill pipe string, the walls of the pipes 22 not compressed by hydraulic pressure are straightened (Fig. 1) until they are pressed firmly against the walls of the extended section 20 of the well 21. The loads acting on the rolling rollers 5 are transferred to the pusher 15, forcing it to rotate around the central axis of the housing 1. Due to the interaction of the samples 17 (figure 4) of the rollers 5 with the protrusions 19 of the pusher 15, slipping of the rollers 5 relative to the expandable pipes 22 (figure 2) is eliminated, allowing to reduce the axis the load on the device and pipes expanded by it 22.

At the end of the flaring, the drill pipe string with the device is lifted from the well.

The proposed device, due to the presence on the rolling rollers of the samples interacting with the reciprocal protrusions on the pusher, allows the pipe to be expanded without slipping of the rollers, which significantly increases the resource of the rollers and allows higher quality flaring of the profile pipes, including those with non-circular or curved surfaces.

Claims (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 are mounted on axles, the lower ends of which are mounted in supports placed in hinges 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 with the possibility of limited movement outward, and in the Central channel axially spring-loaded hydraulic annular piston with a pusher having an outer conical surface, characterized in that 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 the rollers of its conical surface having protrusions under sample clips.

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