RU51658U1 - DEVICE FOR FOLDING OUT LONGITUDINED PIPES - Google Patents

Abstract

The proposal is intended for the use of the oil and gas industry, namely for the expansion of shutoffs from longitudinally corrugated pipes installed in wells. A device for expanding longitudinally corrugated pipes, comprising a housing with a central channel, a retainer, a coupling and nipple threads for connecting to downhole equipment and drilling or grooves in the housing wall, in which rollers are mounted mounted on axes inclined with respect to the axis of the housing with a gap between their lateral surface and wall drilling or grooves. Most of the rollers are covered by drilling walls or housing grooves. One end of the axis of the rollers is detachably fixed in the casing, and the other is fixed in the casing by a casing lock made in the form of a sleeve screwed into the coupling thread of the casing and adapted for connection with downhole equipment. The number of longitudinal corrugations of pipes to be expanded should not be a multiple of the number of rollers. The design of the proposed device is cheap, simple both to manufacture and to repair the device due to the simplicity of the design of the axles of the rollers, and also eliminates emergency situations by eliminating sharp and powerful shock loads during the expansion of longitudinally corrugated pipes, since the number of longitudinal corrugations of pipes to be flaring, not a multiple of the number of rollers.

Description

The proposal is intended for use in the oil and gas industry, namely for the expansion of shutoffs from longitudinally corrugated pipes installed in wells.

It is known "Device for expanding pipes in wells" (a.s. SU No. 371340, E 21 B 29/00, publ. 1973), comprising a housing with a Central channel with a thread for connection with downhole equipment, while the housing consists of interconnected cylindrical and conical parts, in the last of which cylindrical grooves are made with rollers placed therein obliquely relative to the axis of the housing.

The disadvantages of this device are:

firstly, the rapid wear of the surfaces of the rollers and grooves in which they are placed, due to their mutual abrasion during operation;

secondly, the impossibility of achieving increased work loads when expanding longitudinally corrugated pipes, due to the grooves on the side of the connection of the conical part of the body with the cylindrical part, which forms a weakened section in it;

thirdly, the possibility of accidents when using a device for expanding pipes with the number of longitudinal corrugations to a multiple of the number of rollers, which occurs when the rollers hit the longitudinal corrugations at the same time and, as a result, leads to sharp and powerful shock loads, leading to the destruction of downhole equipment.

The closest is the "Device for expanding pipes" (patent RU No. 2144128, E 21 B 29/00, publ. BI No. 1 of 01/10/2000), comprising a housing with a central channel, sleeve and nipple ends with threads for connecting to downhole equipment and recesses in the wall, in which the rollers are placed, mounted on inclined axes with respect to the axis of the body, with a gap between their lateral surface and the walls of the recesses, while the recesses for placing the rollers are made in the form of longitudinal cylindrical drills and grooves in the wall of the body so h a large part of the lateral surface of the rollers is covered by walls of these bores or grooves, and the roller axles at its one end releasably secured in the housing, and their other

the ends are provided with shanks located in cylindrical drills or grooves and forming, with its surface of the nipple end of the body affected by them, a common conical surface on which the nipple thread is made, while the body is equipped with an axis shank fixer in the drills or grooves, made in the form of a sleeve screwed onto the nipple the end of the body and adapted for connection with downhole equipment.

The disadvantages of this device are:

firstly, high material costs in the manufacture and repair associated with the complexity of manufacturing and fitting of both new axles with shanks, and when replacing worn roller axles during operation;

secondly, the possibility of emergency situations when using a device for flaring pipes with the number of longitudinal corrugations to a multiple of the number of rollers, which occurs when rollers hit the longitudinal corrugations and, as a result, leads to sharp and powerful shock loads, leading to the destruction of downhole equipment.

The technical task of the proposed device is to create a cheap, easy to manufacture and repair the device due to the simplicity of the design of the axles of the rollers, as well as the elimination of emergency situations due to the absence of sharp and powerful shock loads when expanding longitudinally corrugated pipes.

The technical problem is solved by a device for expanding longitudinally corrugated pipes, including a housing with a central channel, a retainer, a coupling and nipple threads for connecting to downhole equipment and drilling or grooves in the housing wall, in which rollers are mounted, mounted on axes inclined with respect to the axis of the housing with a clearance between their lateral surface and the walls of the drillings or grooves, with most of the rollers covered by the walls of the drillings or grooves of the housing, while one end of the axis of the rollers is fixed in split housings.

What is new is that the second end of the axis of the rollers is fixed in the housing by a housing retainer made in the form of a sleeve screwed into the sleeve thread of the housing and adapted to connect with downhole equipment, the number of rollers in the housing being selected in such a way that the number of longitudinal corrugations of pipes to be expanded should not be a multiple of the number of clips.

Figure 1 shows a General view of the device with a partial axial section.

Figure 2 shows a bottom view of the device.

A device for expanding longitudinally corrugated pipes 1 (see Figure 2) contains a housing 2 (see Figure 1) with a central channel 3, a retainer 4, a sleeve 5 and a nipple

6 threads for connection with downhole equipment (not shown in Fig.) And drillings or grooves 7 in the wall of the housing 2, in which the rollers are placed 8. The rollers 8 are mounted on axes 9 inclined with respect to the axis of the housing with a gap between their side surface and the walls drilling or grooves 7, with most of the rollers 8 covered by the walls of the drilling or grooves 7 of the housing 2. One end 10 of the axis 9 of the rollers 8 is fixed in the housing 2 detachably. The second end 11 of the axis 9 of the rollers 8 is fixed in the housing 2 by a retainer 4 of the housing 2, made in the form of a sleeve screwed into the sleeve thread 5 of the housing 2 and adapted due to the thread 12 for connection with downhole equipment. The number of rollers 8 in the housing are selected so that the number of longitudinal corrugations 13 (see Figure 2) of the pipes 1 to be expanded, should not be a multiple of the number of rollers 8.

The device operates as follows:

The assembled device (see Fig. 1) is lowered into the well (not shown in Fig.) As part of the downhole equipment by means of sleeve 5 and nipple 6 threads of the body 2 and threads 12 of the retainer 4. Upon reaching the section of the well with a longitudinally corrugated pipe 1 (see Figure 2), which is fixed by a decrease in the weight of the downhole equipment at the wellhead (in Fig. Not shown) by instruments (in Fig. Not shown), the downhole equipment is given rotational-translational movement, which through the body 2 (see Fig. 1) axis 9 are transmitted to the rollers 8. In this case, the rollers of 8 flare vayut longitudinal corrugations 13 (see FIG. 2) together with the pipe 1 to the desired outer diameter (usually to well walls, or walls of the well casing). The fluid supplied from the wellhead, passing through the central channel 3 (see Figure 1) and falling into the expansion zone of longitudinally corrugated pipes 1 (see Figure 2) by rollers 8, acts as a cutting fluid, reducing wear on the rollers 8 and axes 9 (see Figure 1) during flaring. The process of expanding longitudinally corrugated pipes 1 (see Figure 2) ends after it passes through the rollers 8 along the entire length, which is fixed by the devices at the wellhead in the form of a sharp increase in the weight of the downhole equipment. After which the device is removed from the well.

Since the rollers 8 (see Figure 1) do not interact with the walls of the drillings 7, the rollers 8 are not subjected to additional wear associated with friction against the walls of the drillings 7, which increases the service life of the device. In this case, the entire load is distributed on the axis 9 and the rollers 8, which are revised after each flaring operation. Worn axles 9 and / or rollers 8 are replaced. To do this, the latch 4 is unscrewed from the coupling thread 5 of the housing 2, freeing the end 11 of the axis 9. Then the other end 10 of the axis 9

is removed from the housing 2, freeing the axis 9 with the roller 8. After replacing the worn elements, the assembly is carried out in the reverse order.

Since the number of longitudinal corrugations 13 (see FIG. 2) of the pipes 1 is not a multiple of the number of rollers 8, it is not possible for the rollers 8 to simultaneously hit these corrugations 13. Failure to comply with this requirement will result in the rollers 8 falling simultaneously into the longitudinal corrugations 13 of the pipes 1, as a result, the downhole equipment under pressure of its own weight, having lost support, will straighten out by introducing the rollers 8 into the longitudinal corrugations 13 of the pipe 1 to a length that will be greater than the calculated value for the normal mode of expansion. Further, with further rotation of the downhole equipment, the rollers 8 will come into simultaneous interaction with the longitudinal corrugations 13, leading to shock loads that can exceed the strength characteristics of the downhole equipment and device or are constantly repeated cyclically with each revolution of the device. All of this, collectively or separately, can lead to emergency situations in the well or the rapid failure of the downhole equipment and device.

The design of the proposed device is cheap, simple to manufacture, and when repairing the device due to the simplicity of the design of the axles of the rollers, and also eliminates emergency situations by eliminating sharp and powerful shock loads during the expansion of longitudinally corrugated pipes, since the number of longitudinal corrugations of pipes to be flaring, not a multiple of the number of rollers.

Claims (1)

A device for expanding longitudinally corrugated pipes, comprising a housing with a central channel, a retainer, a coupling and nipple threads for connecting to downhole equipment and drilling or grooves in the housing wall, in which rollers are mounted mounted on axes inclined with respect to the axis of the housing with a gap between their lateral surface and walls of the drillings or grooves, with most of the rollers covered by the walls of the drillings or grooves of the housing, while one end of the axis of the rollers is detachably fixed in the housing, distinguishing the fact that the second end of the axis of the rollers is fixed in the housing by a housing retainer made in the form of a sleeve screwed into the coupling thread of the housing and adapted for connection with downhole equipment, the number of rollers in the housing being selected in such a way that the number of longitudinal corrugations of pipes to be expanded, should not be a multiple of the number of clips.