RU2297514C1 - Device for pipe flaring in well - Google Patents

Abstract

FIELD: well drilling and workover, particularly to flare well shutters made of profiled pipes.

SUBSTANCE: device comprises body split in transversal direction and provided with central channel, treads to connect thereof with downhole equipment and main depressions made in outer surface of lower body part. The main depressions are adapted to receive pinned rollers, which are parallel or nearly parallel to geometrical body axis. The rollers are made as cylinders gradually smoothly expanding in upward direction. The cylinders are provided with chambers and are in contact with supports. Additional depressions are made in outer surface of upper body part. The additional depressions are separated from main ones with bridges. Roller supports are formed as bushes with upper ends inserted into annular grooves formed in bridges of upper body part. The roller supports are fixed from rotation inside the grooves with fingers. Roller pin ends are provided with threads. Lower pin ends are engaged with corresponding threads made in lower body part. Upper pin ends are arranged in additional depressions in upper body part and are fixedly secured to bridges by means of nuts.

EFFECT: increased operational ability and flaring quality.

4 dwg

Description

The invention relates to drilling and overhaul of wells and is intended, in particular, for flaring devices from shaped pipes when installed in the well.

A device for expanding pipes in a well is known (RF patent No. 2144128, IPC 7 ЕВВ 29/10, published in bulletin No. 1 of January 10, 2000), including a housing with a central channel, threads for connection with downhole equipment and recesses in the wall in which the rollers are mounted, mounted on axes inclined with respect to the geometric axis of the housing. In this case, the axes of the rollers are detachably fixed at one end in the housing, and the other ends are equipped with shanks located in cylindrical drills or grooves and forming, with the surface of the lower end of the housing not touched by them, a common conical surface on which the connecting thread is made.

Closest to the invention in terms of technical nature and the number of matching essential features is a device for expanding pipes in wells (RF patent for utility model No. 46527, IPC 7 ЕВВ 29/10, publ. July 10, 2005, bull. No. 19), 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 axes parallel or with a slight deviation from parallelism with the geometric axis of the housing; therefore, from the bottom up steplessly above each other cylinders with chamfers and in contact with the supports.

The main disadvantages of the known devices are the low efficiency and quality of the expansion of multi-beam (more than two longitudinal corrugations) profile pipes, since the contact of a three-row roller arrangement with the inner surface, for example, a six-beam corrugated pipe forms a triangle during the expansion of the flare, and with further rotation of the flare, screw twisting of the pipe occurs, leading to the destruction of its cylindrical end. At the same time, a mechanical increase in the number of rows of rollers without reducing the strength of the flare case is impossible due to the limited diametrical dimensions of the wells.

In addition, the device according to patent No. 2144128 is difficult to manufacture and maintain due to the presence of shanks on the axes forming a common conical surface with the body on which the conical thread is made. And in the device according to the patent for utility model No. 46527, fixing the ends of the axes of the rollers in the housing does not prevent the rollers from falling out of the recesses of the housing in the event of a breakdown of their axes during operation of the flare tool in the well.

An object of the invention is to increase the operability of the device and the quality when expanding multi-beam profile pipes in wells.

This is achieved by the fact that in the described device for expanding pipes in a well, including a body with a central channel, threads for connecting to downhole equipment and recesses on the outer surface, which are mounted on axes parallel or with a slight deviation from parallelism of the geometric axis of the body, rollers made in the form of cylinders with bevels expanding sequentially from bottom to top stepless above each other and in contact with supports, according to the invention, the housing is made connector recessed in cross section, the recesses for the rollers are made in the lower part of the housing, and in the outer surface of the upper part there are additional recesses separated by jumpers from the main ones, the roller supports are made in the form of bushings entering the upper ends of the annular grooves made in the jumpers of the upper part of the housing , and pins fixed in it from rotation, and the ends of the axes of the rollers are threaded, the lower ones are screwed into the corresponding threads made in the lower part of the housing, and the upper ends of the axes are placed in additional recesses in the upper part of the housing and are rigidly attached to the jumpers with nuts.

This allows you to increase the efficiency of the device and the quality when expanding multi-beam profile pipes in wells, by increasing the rows of rollers (from three to five) without reducing the strength of the housing, due to the replacement of the recesses in it for the largest diameter rollers with bushings that mesh with both parts of the split housing (multilayer effect).

Figure 1 shows a device installed in a flared profile pipe; figure 2 is a section aa in figure 1 of the device outside the well; figure 3 and 4 - section bb and bb (respectively) in figure 1, which shows the position of the profile pipe in the well before and after flaring.

A device for expanding pipes in a well (Fig. 1) contains a detachable cross-sectional body consisting of upper 1 and lower 2 parts, with a central channel 3 and threads 4 and 5 for connection with downhole equipment. Recesses 6 are made on the outer surface of the lower part 2 of the housing, in which rollers 8 are mounted on the axles 7, made in the form of cylinders with bevels expanding sequentially from bottom to top one above the other. Axes 7 of the rollers 8 are parallel or (in order to maintain the nominal diameter of the flare ) with a slight deviation (at an angle of not more than 2 °) from the parallelism of the longitudinal geometric axis of the body and equipped with threads 10 and 11, made at their ends. At the same time, the lower ends with threads 10 are screwed into the corresponding threads 12 of the lower part 2 of the housing, and the upper ends with threads 11 are located in additional recesses 13 made in the upper part 1 of the housing and are attached by nuts 14 to its jumpers 15 located between the recesses 6 the lower part 2 of the housing and additional recesses 13 in its upper part 1. In the jumpers 15 there are openings 16 in which the upper ends of the axles 7 are located.

To supplement the weakened recesses 6 of the strength of the housing (1, 2), the device is equipped with bushings 17, the upper ends 18 entering the annular grooves 19 (figure 2), made in jumpers 15 of the upper part 1 of the housing. The bushings 17 are fixed in the upper part 1 of the casing with pins 20 and additionally serve as a supporting surface for the rollers 8, and also center the upper 1 and lower 2 parts of the casing with each other and prevent them from turning relative to each other. The lower part 2 of the housing has channels 21 for flushing the well and a device for unscrewing the shoe (not shown) from the profile overlap 22 (Figs. 1, 3), consisting of a key 23 with end slots 24 and a sleeve 25 with split spring rings 26.

The operation of the device is illustrated by the example of expansion of the overlapper from the profile pipes when they isolate the zone of the complication of drilling, for example, the absorption of drilling fluid (Fig.1, 3, 4).

Profile shutter 22, consisting of six-beam profile pipes (Figs. 1, 3), is lowered into the zone of complication of drilling the well 27 and is expanded until its walls are pressed against the walls of the well 27 by creating internal hydraulic pressure. Then, using the thread 4 of the upper part 1 of the casing, the device is connected to the drill pipe string (not shown) and lowered into the well 27. When the device reaches the upper end of the profile block 22, the drill pipe string is rotated while creating axial load and flushing the pipe cavity and the device through the Central channel 3 and the washing channels 21 of the housing by fluid injection. As a result of this, the pressure-less sections 28 (Fig. 3) of the profile pipes of the shutoff valve 22 are straightened until the entire outer surface of the shutoff pipes is tightly pressed against the walls of the well 27 (Fig. 4).

At the end of the flaring and unscrewing of the shoe (not shown) of the blocker 22 using the device 23-26, the drill pipe string with the device is lifted from the well.

The described improvements of the device allow, using the advantages of roller flare comparing with roller cone, to use it for expanding six-beam profile pipes by increasing the number of rollers and, therefore, the area of their contact with the inner surface of the pipes, without compromising the strength of the device body.

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 arranged mounted on axes parallel or with a slight deviation from parallelism of the geometric axis of the housing, made in the form of expanding sequentially from the bottom up steplessly above one another cylinders with chamfers and in contact with supports, characterized in that the housing is detachable in cross section, recesses for Oliks are made in the lower part of the casing, and in the outer surface of its upper part additional recesses are made, separated by jumpers from the main ones, the roller supports are made in the form of bushings that enter the annular grooves with the upper ends made in the jumpers of the upper part of the casing, and are fixed in it from rotation pins, and the ends of the axes of the rollers are threaded, the lower ones are screwed into the corresponding threads made in the lower part of the housing, and the upper ends of the axes are placed in additional recesses of the upper hour and housing and rigidly attached to his nuts jumpers.

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