RU2312971C1 - Tube expanding device - Google Patents

Abstract

FIELD: oil production, particularly equipment to expand pipes installed in wells.

SUBSTANCE: device comprises body with central channel, coupling and nipple ends and connection threads for device connection with downhole equipment. Body wall has depressions to receive rollers supported by pins. Device also has collar rotationally installed on the body. Depressions for roller receiving are made as grooves in body wall so that major parts of roller side surfaces are enclosed with groove walls. Rollers are fixedly secured to pins retained in collar so that they may rotate. Each pin has upper part shifted forward along a circle in body rotation direction. Cylindrical roller part may cooperate with outer body surface.

EFFECT: simplified structure, decreased costs of device manufacturing, repair and operation.

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Description

The invention relates to the oil industry and is intended for flaring pipes installed in wells.

It is known “Device for flaring pipes” (patent RU No. 2191883, ЕВВ 29/10, publ. Bull. 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 the rollers are mounted on the axes, the upper ends of which are fixed in the housing detachably, while the lower ends of the axes of the rollers are mounted in supports 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 about Hinge removal and replacement.

The disadvantages of the device are:

- the complexity of manufacturing and, as a consequence, the high material costs of manufacturing;

- high axial loads are necessary in the process of pipe expansion;

- high radial loads directly on the axis, significantly reducing their service life.

The closest in technical essence and the achieved result is a "Device for flaring pipes" (patent RU No. 2144128 ЕВВ 29/10, publ. Bull. No. 1 dated 10.01.2002), including a housing with a central channel, coupling and nipple ends with threaded connections for downhole equipment and recesses in the wall, in which the rollers are placed, mounted on axes inclined relative to the housing with a gap between their lateral surface and the walls of the recesses, while the recesses for the rollers are made in the form of longitudinal cylindrical drilling and grooves in the wall of the housing so that most of the side surface is covered by the walls of these drills or grooves, and the axis of the rollers with one of their ends is detachably fixed in the housing, and the other ends are equipped with shanks that are detachable in cylindrical drillings or grooves and form a nipple surface with no touches the end of the housing a common conical surface on which the nipple thread is made, while the shanks can be rigidly connected to the axes of the rollers.

The disadvantages of the device are:

- the complexity of manufacturing and, as a consequence, the high material costs of manufacturing;

- high axial loads are necessary in the process of pipe expansion;

- high radial loads directly on the axis, significantly reducing their service life.

The technical task of the proposed device is to simplify the design, reduce during operation axial loads on the housing and radial loads on the axis and, as a result, reduce material costs for manufacturing, repair and maintenance.

The technical problem is solved by a device for expanding pipes, including a housing with a central channel, sleeve and nipple ends with threads for connection with downhole equipment and recesses in the wall of the housing, in which the rollers mounted on the axles are placed, while the recesses for the rollers are made in the form of grooves in the wall of the housing so that most of the side surface of the rollers is covered by the walls of these grooves.

What is new is that it is provided with a yoke mounted rotatably on the housing, and the rollers are rigidly connected to the axes, which are rotatably fixed to the housing wall, and the rollers are rigidly connected to the axes rotatably mounted in the yoke, with the top of each the axes are shifted circumferentially forward in the direction of rotation of the housing, and the cylindrical part of the roller is configured to interact with the outer surface of the housing.

Figure 1 shows a device with a partial longitudinal section.

Figure 2 shows a section aa.

Figure 3 shows a view of B.

A device for expanding pipes includes a housing 1 (see FIG. 1) with a central channel 2, sleeve 3 and nipple 4 ends with threads 5 and 6 for connection with downhole equipment (not shown in FIG.) And a recess 7 in the wall 8 of the housing 1 in which the rollers 9 are mounted on the axles 10. The recesses 7 for the rollers 9 are made in the form of grooves in the wall 7 (see Figure 3) of the housing 1 (see Figure 1) so that most of the side surface of the rollers 9 ( see Figure 2) is covered by the walls 8 of these grooves 7. The axis 10 (see Figure 1) of the rollers 9 are mounted in the housing 1 for rotation. The clip 8 is mounted on the housing 1 with the possibility of rotation. The rollers 9 are rigidly connected to the axles 10, which are rotatably fixed in the wall of the housing 1. The top of each of the axes 10 is displaced circumferentially forward along the rotation of the housing 1 by an angle α (see Figure 3). The cylindrical part 11 (see Figure 1) of the roller 9 is configured to interact with the outer cylindrical 12 surface of the housing 1.

The device operates as follows.

In the borehole (not shown in FIG.) During the installation interval on the pipe string (not shown in FIG.), A dispensable pipe (not shown in FIG.) Is lowered, in which overpressure is created by pre-pressing against the walls or casing (in FIG. . not shown) wells. Next, the complete assembly using the threads 5 and 6 of the sleeve 3 and the nipple 4 ends of the housing 1 is connected to the downhole equipment and lowered into the well by the pipe string (not shown in FIG.) To the installation interval of the pipe being distributed. In this case, the pipe string is filled with the borehole fluid through the central channel 2 of the housing 1. After the rollers 9 interact with the pipe being distributed (determined by the weight indicator located at the wellhead), the housing 1 is given a downward-and-down movement. The rollers 9, rotating in the grooves 7 (see Fig. 3) of the cage 8 (see Fig. 1), interact with the distributable pipe, which is tightly and tightly pressed against the wall of the well or to the casing along the entire length. In this case, the cylindrical part 11 of the roller 9 interacts with the cylindrical part 12 of the housing 1, rotating around it together with the cage 8 (see Figure 2) and minimizing the load on the axis 10 (see Figure 1), significantly increasing their service life . Due to the large contact area, a “hardening” is formed in the place of interaction between the cylindrical parts 11 and 12 of the rollers 9 and the housing 1, which increases the wear resistance of these parts and, as a result, their service life. Due to the fact that the top of each of the axes 10 is displaced circumferentially forward along the rotation of the housing 1 by an angle α (see FIG. 3), during the rotation of the housing 1 (see FIG. 1) the effect of “screwing” the rollers 9 into the handed out pipe, reducing by 1.5-2 times (relative to analogues) the axial load on the body, necessary for the expansion of this pipe. Since the axis 10 does not experience significant radial loads, they are rigidly connected to the rollers 9, reducing the number of parts necessary for manufacturing and simplifying the assembly of the entire device. Moreover, the design of the housing 1 and the holder 8 are easy to manufacture and assemble. Also, in view of the reduction of the axial load, the housing 1 is made 15-20% (relative to analogues) less metal-intensive.

The proposed design of the device is simple to manufacture and assemble, reducing during operation the axial load on the housing and radial loads on the axis and, as a result, reducing material costs for manufacturing, repair and maintenance.

Claims (1)

A device for expanding pipes, including a housing with a central channel, sleeve and nipple ends with threads for connecting to downhole equipment and recesses in the wall of the body, in which the rollers mounted on the axles are placed, while the grooves for the rollers are made in the form of grooves in the wall of the housing that most of the lateral surface of the rollers is covered by the walls of these grooves, characterized in that it is provided with a cage mounted on the housing for rotation, and the rollers are rigidly connected to the axes, fixed mi in the cage with the possibility of rotation, and the top of each of the axes is shifted circumferentially forward in the direction of rotation of the housing, and the cylindrical part of the roller is configured to interact with the outer surface of the housing.

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