RU2387800C1 - Pipe flaring device - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: pipe flaring device comprising a hollow rod in the form of a cone narrowed downwards with union and pin threads, a windowed body rotatable and boundedly longitudinally movable in relation to the rod cone, the rollers mounted in the windows of the body and inclined to the axis of the rod, interacting with the rod and comprising cylinders equipped in its bottom part with radial facets. And from the top, the cone the hollow rod has a cylinder with a screw trapezoid flute with its inclined surface turned upwards, and from beneath is comprises a cylindrical sample; the body above the windows is equipped with a stopper load-assisted from inside and interacting with the screw flute and the cylindrical sample.

EFFECT: simplicity in manufacturing and assembly that ensures preventing the emergencies.

3 dwg

Description

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

It is known “Device for expanding pipes in a well” (patent for PM PM No. 58155, ЕВВ 29/10, publ. Bull. No. 31 dated 10.11.2006), including a housing with a central channel, threads for connection with downhole equipment and recesses on the outer surface, in which the rollers with axles are placed, and in the central channel of the housing there is a hydraulic annular piston spring-loaded in the axial direction, while the rollers are rigidly connected to the axes, the upper and lower ends of which are mounted in the housing for rotation and limited radial movement, while the piston is made conical with the possibility of interaction from the inside with the surface of the rollers.

The disadvantage of this device is the possibility of emergency situations in the form of sticking and jamming of the tool, since when relieving pressure, the piston, clamped by the rollers, does not return to the transport position, and, as a result, the possibility of damage to the device and rolled pipes when lifting, since the diameter of the expanded pipes 0.5-1% less than the diameter described around the rollers of the device.

The closest in technical essence and the achieved result is a "Device for pipe expansion" (patent for PM of RF № 62967, ЕВВ 29/10, publ. Bull. № 13 from 05/10/2007), containing a hollow rod with coupling and nipple threads at the ends, rotatably located on the middle part of the rod, a case with windows in which rollers are located at an angle to the axis of the rod, interacting with the rod and made in the form of cylinders, which are equipped with radial chamfers in the lower part, the length of which is more than three times less cylinder length ra, while the middle part of the rod is made in the form of a cone tapering downwards, and the body is spring-loaded upward and with the possibility of limited axial movement downward relative to the middle part of the rod.

The disadvantage of the device are:

- the possibility of emergency situations and, as a consequence, the possibility of damage to the device when it is lowered into the well, since the device is in the working position during the descent, and the diameter described around the rollers is equal to the diameter of the wellbore;

- the wear of the rollers both when the device is lowered into the well, and when the device is lifted due to the contact of the rollers against the rock, since the case with the rollers is constantly spring loaded into the working position.

The technical task of the proposed device is to create a simple and reliable design that allows you to avoid accidents due to the possibility of reducing the described diameter of the device both when the device is lowered into the well and when it is lifted, and the pipes are qualitatively rolled along their entire length.

The technical problem is solved by a device for expanding pipes containing a hollow rod made in the form of a cone tapering downwards, with sleeve and nipple threads at the ends, a case with windows located for rotation and limited longitudinal movement relative to the cone of the rod, rollers installed in the case windows under angle to the axis of the rod, interacting with the rod and made in the form of cylinders, which are equipped with radial chamfers at the bottom.

What is new is that on top of the cone the hollow rod is equipped with a cylinder with a helical trapezoid groove, the inclined surface of which is facing up, and a cylindrical selection at the top, and the case above the windows is equipped with a spring-loaded stopper designed to interact with the helical groove and the cylindrical selection.

Figure 1 shows the device in a transport position with a partial longitudinal section.

Figure 2 shows a view A.

Figure 3 shows the device in working position with a partial longitudinal section.

A device for expanding pipes contains a hollow rod 1 (see Figure 1), made in the form of a cone tapering downwards 2, with a sleeve 3 and a nipple 4 thread. The housing 5 with the windows 6 is arranged to rotate and limited longitudinal movement relative to the cone 2 of the rod 1. The rollers 7 installed in the windows 6 of the housing 5 at an angle α to the axis of the rod 1 (see Figure 2), interact with the rod 1 and are made in in the form of cylinders 8, which are equipped with radial chamfers at the bottom 9. On top of the cone 2, the hollow shaft 1 is equipped with a cylinder 10 with a helical trapezoidal groove 11, the inclined surface 12 of which is facing up, and a cylindrical selection 13 at the top. The housing 5 above the windows 6 is equipped with a spring-loaded stopper 14 configured to interact with a helical trapezoidal groove 11 and a cylindrical selection 13.

The device operates as follows.

In the well (in FIG. Not shown) in the installation interval on the pipe string (in FIG. Not shown), expandable pipes (not shown in FIG.) Are lowered, in which excess pressure is created by first pressing them against the walls or to the casing (on Fig. Not shown) wells. Next, the complete assembly using the threads 3 and 4 of the rod 1 is connected to the downhole equipment and lowered onto the pipe string (not shown in Fig.) Into the well up to the installation interval of the expandable pipes. In this case, the pipe string is filled with the borehole fluid through the cavity 15 of the rod 1. After the interaction of the rollers 7 with the expandable pipe (determined by the weight indicator located at the wellhead), the rod 1 is rotationally and translationally downward. The rollers 7, rotating in the windows 6 of the housing 5 (see Figure 1), interact with the rolling pipe and the conical middle part of the rod 1, rotating around it together with the housing 5. Due to the fact that the rotation speed of the rod 1 with the cylinder 10 s the screw trapezoidal groove 11 is higher than the rotation speed of the housing 5 with the rollers 7 and the spring-loaded stopper 14, the stopper 14 is screwed up (moving upward) together with the housing 5 and the rollers 7 relative to the rod 1. In this case, the cone 2 of the rod 1, acting on the rollers 7 from the inside, leads rollers 7 in operating position (see figure 3), and the spring stopper 16, the stopper 14 moves along the helical trapezoidal groove 11 to the cylindrical selection 13. The rollers 7 interact with the roll pipe, which is tightly and tightly pressed against the wall of the well or to the casing along the entire length. Due to the fact that the rollers 7 are inserted into the windows 6 (see FIG. 2) at an angle α, during the rotation of the rod 1 (see FIG. 3), the effect of “screwing” the rollers 7 into the roll pipe is observed. At the end of the flaring, when lifting the device from the flared pipes due to the contact of the rollers 7 against the wall of the flared pipe, due to the inclined surface 12 of the screw groove 11, the stopper 14, compressing the spring 16, is lifted and the housing 5 with the stopper 14 and the rollers 7 moves down relative to the rod 1 with a cone 2. In this case, the diameter described around the rollers 7 of the device becomes smaller, which ensures free exit of the device from the expanded pipe.

The proposed design of the device, which is simple to manufacture and assemble, avoids emergency situations due to the possibility of reducing the described diameter of the device both when lowering the device into the well and during its lifting and to qualitatively expand the pipes along their entire length.

Claims (1)

A device for expanding pipes containing a hollow rod made in the form of a cone tapering downwards, with coupling and nipple threads at the ends, a case with windows arranged for rotation and limited longitudinal movement relative to the cone of the rod, rollers installed in the case windows at an angle to the axis rod interacting with the rod and made in the form of cylinders, which are equipped with radial chamfers in the lower part, characterized in that the hollow rod is equipped with a cylinder with a helical trapezium on top of the cone idnoy groove, wherein the inclined surface faces upward, and the cylindrical sample top and the housing is equipped with a spring-loaded inwardly windows stopper adapted to cooperate with the helical groove and the cylindrical sample.

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