RU64263U1 - DEVICE FOR RIPPING PIPES IN A WELL - Google Patents

Abstract

A device for expanding pipes in a well, including a housing with a central channel, threads for connecting to downhole equipment and samples on the outer surface, in which rollers are placed with the possibility of rotation and limited radial movement, an axially hydraulic piston spring-loaded with a conical surface made with the ability to interact from the inside with the rollers. The housing is provided with an annular groove under the samples with a tapered surface at the top, tapering downward, configured to interact with the rollers from above from the inside, while the annular piston is equipped with an tapered tapering surface and is placed in the annular groove below the rollers, which are chamfered from above and below, while the annular The groove below the piston is in communication with the central channel.

The described improvements of the device allow reliable and trouble-free expansion of expandable pipes, which ensures the free passage of the drilling tool through the expanded pipes during subsequent drilling or well operation.

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Description

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

It is known "Device for flaring pipes" (US Pat. RU No. 2191883, ЕВВ 29/10, publ. Bull. No. 30 dated 10.27.02), including a housing with a central channel, threads for connection with downhole equipment, and recesses on the outside surfaces in which rollers are mounted on 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 turning them in a plane passing through the geometric axes 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 pipe expansion in the well" (pat. PM PM RU No. 58155, ЕВВ 29/10, publ. Bull. No. 31 dated 10.11.06), including a housing with a central channel , with 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, axially spring-loaded. Moreover, 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 piston is made conical with the possibility of interaction from the inside with the surface of the rollers.

The disadvantages of the device are:

- the possibility of jamming of the device in the working position due to the low taper of the piston, which can lead to an emergency;

- in case of spring breakage, the piston remains in the working position and return to the transport position is not possible, which can also lead to an emergency.

The technical task of the proposed device is the elimination of emergency situations and improving reliability during operation and hoisting operations of the device.

The technical problem is solved by a device for expanding pipes in the well, including a housing with a central channel, threads for connecting to the downhole equipment and samples on the outer surface, in which rollers are placed with the possibility of rotation and limited radial movement, an axial hydraulic piston spring-loaded with a conical surface made with the possibility of interaction from the inside with the rollers.

What is new is that the housing is provided with an annular groove under the samples with a conical surface tapering downward, configured to interact with the rollers from above from the inside, while the annular piston is provided with a tapering upward tapering surface and placed in the annular groove below the rollers, which are provided with upper and lower bevels, with the annular groove below the piston in communication with the Central channel.

The drawing shows a device with a longitudinal section in a transport position.

A device for expanding pipes in a well comprises a housing 1 with a central channel 2, threads 3 for connecting to downhole equipment, samples 4 on the outer surface of the housing 1, under which an annular groove 5 with a conical surface 6, tapering from top to bottom, is placed. In the samples 4 of the housing 1, rollers 7 are placed, which are provided with chamfers 8 at the top and bottom. In the annular groove 9 located below the rollers 7, there is a hydraulic annular piston 10, equipped with a conical tapering upwards

surface 11, axially spring-loaded by spring 12. The rollers 7 are mounted for rotation, as well as axial and radial movement within the axial movement of the hydraulic piston 10. The conical surface 6 of the housing 1 and 11 of the hydraulic piston 10 are configured to interact from the inside with the chamfers of 8 rollers 7. The central channel 2 of the housing 1 is in communication with the annular groove 9, in which the hydraulic piston 10 is located with openings 13. To prevent fluid flow, the piston 10 is equipped with sealing cuffs 14. To facilitate assembly, the housing 1 can be made of two parts and interconnected, for example, using thread 15.

The device operates as follows.

Expandable pipes are lowered into the well (not shown) in the installation interval on the pipe string (not shown in the drawing), in which overpressure is created by first pressing them against the walls or to the casing (not shown) of the well. Next, the complete assembly using the threads 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 expandable pipe. In this case, the pipe string is filled with borehole fluid through the central channel 2 of the housing 1. When the device reaches the upper end of the expandable pipes, the pipe string (not shown) start to rotate while creating axial load and flushing the pipe cavity and through the central channel 2 of the housing 1 by pumping fluid. In this case, under the action of the pressure differential transmitted through the holes 13 of the housing 1, the annular piston 10 located in the annular groove 9, compressing the spring 12, moves upward and, interacting with the conical surface 11 from the inside with the chamfers 8 of the rollers 7, presses the upper chamfer 8 of the roller 7 to the conical surface 6 of the housing 1 and displays the rollers 7 in working position. The rollers 7, rotating in the samples 4 of the housing 1, interact with an expandable pipe, which is tightly and hermetically pressed against the wall of the well or to the casing along the entire length. In this case, the chamfers 8 of the rollers 7 interact with the conical part 6 of the housing 1 and the conical part 11 of the piston 10, rotating around them together with the housing 1. At the end of the flaring, the washing of the liquid is stopped, while the piston 10 under the action of the spring 12 and the rollers 7 return to the transport position . Due to the fact that the chamfers 8 of the rollers 7 interact with the conical part 11 of the piston 10 and the conical part 6 of the housing 1, rotating around them together with the housing 1, sliding friction is excluded, as well as at the contact point

Due to the large area of these parts, a “hardening” is formed, which increases the wear resistance of these parts and, as a result, their service life.

The described improvements of the device allow reliable and trouble-free expansion of expandable pipes, which ensures the free passage of the drilling tool through the expanded pipes during subsequent drilling or well operation.

Claims (1)

A device for expanding pipes in a well, including a housing with a central channel, threads for connecting to downhole equipment and samples on the outer surface, in which rollers are placed with the possibility of rotation and limited radial movement, an axially hydraulic piston spring-loaded with a conical surface made with the possibility of interaction from the inside with the rollers, characterized in that the housing is provided with an annular groove under the samples with a conical surface at the top, tapering downwards, capable of communicating with the inside of the top rollers, wherein the annular piston is provided with a tapered surface tapered upwardly and positioned below the annular groove rollers which top and bottom are provided with bevels, the annular groove below the piston communicates with the central channel.