RU62147U1 - PIPE DRILLER IN A WELL - Google Patents

Abstract

The proposal relates to the oil industry and is intended for the expansion of pipes installed in wells. The pipe roll mill in the well comprises a housing with windows in which rollers are located at an angle α to the axis of the rod. The case is equipped with cylindrical samples, respectively, above and below the windows and a central passage through passage. Above and below, the body is equipped with coupling and nipple ends with threads for connection with downhole equipment. The rollers are made in the form of truncated cones with a cylindrical base at the top and are equipped with cylindrical bushings that are inserted into the corresponding cylindrical samples of the windows of the housing with the possibility of rotation above and below the center. The proposed design of the rollers allows to exclude non-cylindrical sections of the inner surface of the distributable pipe after beading by rollers. The proposed design of the pipe roll mill in the well has a low cost due to the simple design and does not require high manufacturing accuracy, since the contact of the rollers with the shaft is excluded. 2 ill. for 1 liter

Description

The proposal relates to the oil industry and is intended for the expansion of pipes installed in wells.

It is known “Device for flaring pipes” (patent SU No. 1621262, B 21 D 41/02, publ. Bull. No. 4 from 02.10.2000), containing conical support and rolling rollers facing the tops of the cones in one direction, while the rollers are made with transverse grooves on their working surface.

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;

- low rolling quality, since the design of the rollers with transverse grooves does not allow to obtain a strictly cylindrical inner surface of the pipe and evenly press it to the outer surface.

The closest in technical essence and the achieved result is "Rolling for pipes" (AS No. 8444107, B 21 D 41/02, publ. Bull. No. 25 of 07/07/1981), containing mounted in the housing with the possibility of axial the cone rod and cone rollers interacting with it, with the tops of the rollers facing the top of the cone of the rod, and the angle between the outer generators of the opposing rollers does not exceed the angle of self-braking.

The disadvantages of the device are:

- a lot of resistance that occurs during operation, since there is rolling both from the inside and outside of the rollers, and therefore the forces exerted on the device for its rotation increase significantly;

- the complexity of the design and the high cost due to the high accuracy of the manufacture of the contacting surfaces of the rollers and the rod, if not observed, the rod contacts the rollers at one point, which leads to a quick failure of the device.

The technical task of the proposed utility model is to reduce the resistance to rotation during operation, as well as simplifying the design and reducing the cost of manufacturing the mill.

The technical problem is solved by rolling pipes in the well, containing a housing with windows in which rollers are located at an angle to the axis of the rod.

What is new is that the casing is equipped with cylindrical samples at the top and bottom of the windows, a passage through the central channel, and at the top and bottom it is equipped with coupling and nipple ends with threads for connection with downhole equipment, while the rollers are made in the form of truncated cones with a cylindrical base at the top and equipped with the top and bottom center cylindrical bushings that are inserted into the corresponding cylindrical selection of the windows of the housing with rotation.

Figure 1 shows a device with a partial longitudinal section.

Figure 2 shows a section aa.

Roller pipe in the well contains a housing 1 with windows 2, in which rollers 4 are located at an angle α to the axis of the rod 3 (see Figure 1).

The housing 1 is equipped with cylindrical samples 5 and 6 (see FIG. 2), respectively, above and below the windows 2, and a central passage channel 7 (partially shown in FIG. 1). Above and below, housing 1 (see FIG. 1) is equipped with sleeve 8 and pin 9 ends with threads 10 and 11, respectively, for connection with downhole equipment (not shown in FIG.).

The rollers 4 are made in the form of truncated cones 12 (see Figs. 1 and 2) with a cylindrical base 13 at the top and equipped with cylindrical bushings 14 and 15 at the top and bottom in the center (see Fig. 2), respectively, which are inserted into the corresponding cylindrical samples 5 and 6 windows 2 of the housing 1 with the possibility of rotation.

Roller pipe in the well works as follows.

In the well (in the FIG. Not shown) during the installation interval on the string of pipes (not shown in FIG.), The distributable pipe (not shown in FIG.) Is lowered, in which excess pressure is created by first pressing the distributable pipe against the walls or to the casing ( in Fig. not shown) wells. Next, the complete assembly using the threads 10 and 11 of the sleeve 8 and the nipple 9 ends of the rod 3 is connected to the downhole equipment and lowered onto the pipe string (not shown) in the well up to the installation interval of the pipe being distributed. In this case, the pipe string is filled with borehole fluid through the passage through the Central channel 7 (see Figure 1). After the interaction of the rollers 4 with the pipe being distributed (determined by the weight indicator located at the wellhead), the rod 3 is given a rotational-translational downward movement. Rollers 4,

rotating in the windows 2 of the housing 1 (see Fig. 1), they interact with the distributable pipe, first with the surface of the truncated cones 12, and then with the cylindrical base 13, while the distributed pipe is tightly and hermetically pressed against the borehole wall or to the casing.

Due to the fact that the rollers 4 are inserted into the windows 3 at an angle a to the axis of the rod 3, during the rotation of the rod 3, the effect of “screwing” the rollers 4 into the distributable pipe is observed. As a result of the fact that the rollers 4 are made in the form of truncated cones 12 (see Figs. 1 and 2) with a cylindrical base 13 at the top and equipped with cylindrical bushings 14 and 15, respectively, above and below the center (see Fig. 2), which are inserted into the corresponding cylindrical samples 5 and 6 of the windows 2 of the housing 1, the rolling of the rollers 4 during the rolling process both from the inside and the outside is excluded, which leads to a decrease in the force applied to the device for its rotation.

The proposed design of the rollers 4 allows to exclude non-cylindrical sections of the inner surface of the distributable pipe after expansion by rollers 4.

The proposed design of the pipe roll mill in the well has a low cost due to the simple design and does not require high manufacturing accuracy, since the contact of the rollers with the shaft is excluded.

Claims (1)

A pipe roll mill in the well, comprising a case with windows in which rollers are arranged at an angle to the axis of the shaft, characterized in that the case is equipped with cylindrical samples above and below the windows, a central channel through passage, and equipped with coupling and nipple ends with threads for connecting with downhole equipment, while the rollers are made in the form of truncated cones with a cylindrical base at the top and are equipped with cylindrical bushings that are inserted into the corresponding cylindrical top and bottom in the center samples of windows of the case with the possibility of rotation.