RU60595U1 - DEVICE FOR RIPPING PIPES IN A WELL - Google Patents

Abstract

The proposal relates to the drilling and overhaul of wells and is intended, in particular, for expanding devices to expand from expandable pipes when installing them in wells.

A device for expanding pipes in a well comprises a housing with a central channel and recesses on the outer surface, in which rollers with upper and lower axles are placed. An annular piston, axially spring loaded, is located in the central channel of the housing.

The rollers are rigidly connected to the upper and lower axles, installed in the housing with the possibility of rotation and limited radial movement within the gap. The housing above the recesses in which the rollers are installed is equipped with an internal annular selection, in which a cylindrical stage is installed, made on the outer surface of the annular piston. The hollow sleeve is hermetically sealed inside the annular piston with the possibility of interaction.

The annular piston is spring-loaded by means of a spring upward relative to the hollow sleeve and is connected to it by a key connection consisting of a key and a keyway.

The inner surface of the housing and the upper end of the cylindrical stage of the annular piston form a hydraulic chamber in communication with the interior of the hollow sleeve by radial holes made in the hollow sleeve. The housing and the hollow sleeve have the possibility of axial movement relative to the annular piston in the working position. Outside of the annular piston below the cylindrical stage, a conical surface is made that interacts with the surface of the rollers. A thread is made at the upper end of the annular piston to connect the device to the downhole equipment.

Due to the fact that the rollers during the rolling process of the expandable pipe interact with the conical surface of the annular piston while simultaneously rotating in different directions, the housing remains stationary, which reduces axial loads on the housing and radial loads on the axis of the rollers during operation.

In addition, the device has a simple design that allows to reduce material costs for manufacturing, repair and maintenance.

1 ill. for 1 liter

Description

The proposal relates to the drilling and overhaul of wells and is intended, in particular, for expanding devices to expand from expandable pipes when installing them in wells.

It is known "Device for flaring pipes" (patent RU No. 2191883, E 21 B 29/10, publ. Bull. No. 30 dated 10.27.02), comprising 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 axles, the upper ends of which are fixed in the housing detachably, and the lower ones are mounted in supports placed in the housing using hinges with the possibility of rotation in a plane passing through the geometric axis of the housing and rollers.

The disadvantage of this analogue are:

- limited applicability, since the outer diameter of the circle, described around the rollers, which are not regulated by departure, cannot be larger than the diameter of the well;

- the possibility of emergency situations in the form of jamming during the descent and ascent of the device in horizontal wells and wells with a complex profile is not ruled out, since the circumference described around the rollers is chosen as close as possible to the diameter of the well;

- 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 expanding pipes in the well" (patent RU No. 2235849, E 21 B 29/10, publ. Bull. No. 25 from 09/10/04), including a housing with a central channel, threaded connections for downhole equipment and recesses on the outer surface, in which the rollers are mounted on the axles, the upper ends of which are fixed in the housing detachably, and the lower are installed in the supports, while the lower ends of the axes are installed in the bearings located in the housing, with using hinges with Stu turn them in a plane passing through the longitudinal geometric axis of the housing and rollers, the upper ends of the rollers mounted in the housing with radial clearance, and in

the central channel of the housing contains a hydraulic annular piston axially spring loaded and having pushers interacting with the upper ends 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 utility model is to reduce axial loads on the housing and radial loads on the axis of the rollers during operation, as well as simplifying the design of the device and, as a result, reducing material costs for manufacturing, repair and operation.

The technical problem is solved by a device for expanding pipes to a well, including a housing with a central channel and recesses on the outer surface, in which rollers with axles are placed, and an annular piston axially spring loaded in the central channel of the housing, as well as a thread for connecting to downhole equipment.

What is new is that the rollers are rigidly connected to the axes, the upper and lower ends of which are mounted in the housing with the possibility of rotation and limited radial movement, while the housing is higher than the recesses into which the rollers are mounted, equipped with an inner ring selection in which a cylindrical stage is placed, made on the outer surface of the annular piston, while inside the annular piston with the possibility of interaction hermetically installed hollow sleeve, and the annular piston is spring loaded upward relative to the hollow and the key is connected with it, the inner surface of the housing and the upper end of the cylindrical stage of the annular piston forming a hydraulic chamber in communication with the interior of the hollow sleeve by radial holes made in the hollow sleeve, the housing and the hollow sleeve having limited axial movement relative to the annular the piston in the working position, while on the outside of the annular piston below the cylindrical step there is a conical surface interacting with the surface a roller, and the thread for connecting the device to the downhole equipment is made at the upper end of the hollow sleeve.

The figure shows a device with a partial longitudinal section in the transport

position.

A device for expanding pipes in a well comprises a housing 1 with a central channel 2 and recesses 3 on the outer surface 4, in which rollers 5 with upper 6 and lower 6 'axes are placed. In the Central channel 2 of the housing 1 is placed an annular piston 7.

The rollers 5 are rigidly connected to the upper 6 and lower 6 'axles, which are installed in the housing 1 with the possibility of rotation and limited radial movement within the gaps 8 and 8', respectively. The housing 1 above the recesses 4, in which the rollers 5 are installed, is equipped with an internal annular selection 9, in which a cylindrical step 10 is installed, made on the outer surface of the annular piston 7. A hollow sleeve 11 is mounted inside the annular piston 7 with the possibility of interaction.

The annular piston 7 is spring-loaded by means of a spring 12 upward relative to the hollow sleeve 11 and is connected to it by a key connection 13, consisting of a key 14 and a keyway 15.

The inner surface of the housing 1 and the upper end of the cylindrical stage 10 of the annular piston 7 form a hydraulic chamber 16, in communication with the inner space 17 of the hollow sleeve 11 of the radial holes 18 made in the hollow sleeve 11. The housing 1 and the hollow sleeve 11 are axially movable relative to the annular piston 7 in working position. Outside of the annular piston 7 below the cylindrical stage 10, a conical surface 19 is made, interacting with the surface of the rollers 5.

At the upper end of the annular piston 7, a thread 20 is made for connecting the device to the downhole equipment (not shown in the figure).

In order to exclude unauthorized fluid flows during the operation of the device, the mating surfaces are equipped with sealing elements 21, 22 and 23.

A device for expanding pipes in the well works as follows.

Expandable pipes are lowered into the well (not shown in the figure) during the installation interval (not shown in the figure), in which they create excess pressure, previously pressing them against the walls or to the casing (not shown) of the well.

Next, the complete assembly using the thread 20 of the housing 1 (see the figure) is connected to the downhole equipment and the pipe string (not shown in the figure).

Next, the device on the pipe string is lowered into the borehole to the installation interval of the expandable pipe, while the pipe string is filled with borehole fluid through the inner space 17 of the hollow sleeve 11. Upon reaching the upper end of the device

expandable pipes, the pipe string (not shown in the figure) begin to rotate while simultaneously creating an axial load and flushing the cavity of the pipe string and the inner space 17 (see the figure) of the hollow sleeve 11 by pumping liquid.

In the process of pumping liquid through the radial holes 18 of the hollow sleeve 11 enters the hydraulic chamber 16. The flow of fluid into the pipe string and, accordingly, into the inner space 17 of the hollow sleeve 11 is increased, while narrowing the inner space 17 made inside the hollow sleeve 11 on its lower late, the fluid pressure in the hydraulic chamber 16 rises. As a result, the hollow sleeve 11 with the housing 1, and the rollers 5 located on the housing 1 moves upward relative to the stationary stationary piston 7, while the key 14 moves down the keyway 15 of the key connection 13, and the hollow sleeve 11 transmits rotation to the ring piston 7.

At the same time, the spring 13 is compressed, and the annular piston 7 with its cylindrical step 10 moves downward within the inner annular sample 9 of the housing 1, while the annular piston 7 with its conical surface 19 acts on the rollers 5, which are shifted radially outward by the axes 6 and 6 ' within the gaps 8 and 8 'relative to the housing 1. As a result, the rollers 5 occupy a working position. The rotation of the pipe string continues, while the rollers 5, rotating in the recesses 4 of the housing 1, interact with an expandable pipe, which is tightly and tightly pressed against the wall of the well or to the casing along the entire length. The rollers 5 interact with the conical surface 19 of the annular piston 7, rotating around their upper 6 and lower 6 'axles due to the rotation of the annular piston 7, and the housing 1 remains stationary.

At the end of the flaring, the injection of fluid into the pipe string is stopped, and accordingly, the fluid pressure in the inner space 17 of the annular piston 7 and the hydraulic chamber 16 decreases sharply, while the hollow sleeve 11 and the housing 1 with rollers 5 located therein are moved downward due to the return force of the spring 13 before the interaction of the hollow sleeve 11 with the annular piston 7, occupying a transport position, while the key 14 moves up the keyway 15 of the key connection 13, and the rollers 5 move down relative to the conical the surface 15 of the annular piston 7, and also are shifted radially inward, occupying a transport position.

Due to the fact that the rollers 5 during the rolling process of the expandable pipe interact with the conical surface 19 of the annular piston 7, while rotating in different directions, while the housing 1 remains not movable, which

provides reduction of axial loads on the housing and radial loads on the axis of the rollers during operation.

In addition, the device has a simple design that allows to reduce material costs for manufacturing, repair and maintenance.

Claims (1)

A device for expanding pipes in a well, including a housing with a central channel and recesses on the outer surface, in which rollers with axles are placed, and an annular piston, axially spring loaded, as well as a thread for connecting to downhole equipment, are located in the central channel of the housing, characterized in that the rollers are rigidly connected to the axes, the upper and lower ends of which are installed in the housing with the possibility of rotation and limited radial movement, while the housing is higher than the recesses in which it is installed The rollers are equipped with an internal annular selection, in which a cylindrical step is placed, made on the outer surface of the annular piston, while the hollow sleeve is hermetically mounted inside the annular piston, the annular piston being spring-loaded upward relative to the hollow sleeve and connected to it by a key connection, the inner surface of the housing and the upper end of the cylindrical stage of the annular piston form a hydraulic chamber in communication with the inner space of the hollow sleeve radial holes made in the hollow sleeve, the housing and the hollow sleeve having the possibility of limited axial movement relative to the annular piston in the working position, while on the outside of the annular piston below the cylindrical step there is a conical surface interacting with the surface of the rollers, the thread for connecting the device to the downhole equipment made on the upper end of the hollow sleeve.