RU2405103C1 - Well pipe flaring device - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: device includes housing with central channel and threads on ends. Main rollers are arranged on axes in cavities on outer surface of housing. Upper ends of axes are installed in housing in a detachable way with possibility of restricted outward movement - to working position, and lower ends - in hinged supports with the possibility of their being turned in cavity passing through longitudinal geometrical axes of housing and rollers. Hydraulic annular piston with sealing rings is arranged in central channel and has pusher which has the possibility of extending the rollers to working position. Upper cavities for additional rollers installed on upper axes are made above cavities of housing. Upper ends of axes interact with housing with possibility of restricted outward radial movement. Pusher is equipped with rotating upper and lower bushes which have the possibility of interacting from inside with additional and main rollers respectively. Recess is made in the housing from inside. Piston above sealing rings is equipped with outward spring-loaded fixture. Between piston and housing there tightly installed above fixture is hold-down bush with possibility of longitudinal downward movement and interaction with fixture to press it inward. Cavity between housing and piston above hold-down bush is interconnected to central housing channel.

EFFECT: improving reliability and operability, reducing material and power costs.

2 dwg

Description

The proposal relates to the drilling and overhaul of wells and is intended, in particular, for flaring profile pipes when they are installed in the well.

It is known "Device for flaring pipes" (RF patent No. 2191883, ЕВВ 29/10, publ. Bull. No. 30 of 10.27.2002), including 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, the lower ends of the axes of the rollers installed in bearings placed in the housing using hinges with the possibility of rotation in a plane passing through the longitudinal geometric axes of the housing and rollers, for about especheniya removal from and replacement joints.

The disadvantages of this device are:

- low quality flared pipes, since the rollers of the device are equipped with narrow calibrating sections;

- limited applicability, since the outer diameter of the circle circumscribed around the rollers, which are not regulated by offset, cannot be greater than the diameter of the well;

- the impossibility of fulfilling the required internal diameter of the expandable pipes with large axial feeds of the tool, since the rollers thus form a helical groove in the pipe body with a step greater than the size of the calibrating portion of the roller, which may require the descent of an additional calibrating tool.

Closest to the proposed technical essence is the "Device for flaring pipes in the well" (RF patent No. 2235849, ЕВВ 29/10, publ. Bull. No. 25 of 09/10/2004), including 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 axes, the upper ends of which are fixed in the housing detachably with a radial clearance, and the lower ends of the axes of the rollers are mounted in the bearings of the housing articulated with the possibility of rotation in a plane passing Erez longitudinal geometric axis of the housing and the rollers, wherein the hydraulic annular piston with a pusher disposed in the central channel of the housing.

The disadvantages of this device are:

- high requirements for manufacturing accuracy and relative position of the pushers and axles of the rollers, because the rollers after putting them into working position should be on the same circumscribed circle;

- insufficient strength of the housing of the device due to the need to perform drilling in it under the annular piston and pushers;

- low reliability, since in the event of a spring breakage, it is possible to jam the annular piston in the working position and the inability to return it to the transport position, which can lead to an emergency;

- increased uneven wear of the axes and the inner surface of the holes of the rollers, since the force from the flaring takes the axis;

- high probability of friction welding of rollers with axles.

The technical objectives of the invention is to increase the reliability and operability of the device for expanding pipes in the well by reducing loads during expansion and eliminating the likelihood of jamming of rollers, saving material and energy costs due to an increase in the resource of the housing, as well as ensuring high-quality straightening in large gears during expansion by double row of rollers.

The technical problem is solved by a device for expanding pipes in the well, including a housing with a Central channel and threads at the ends for connection with downhole equipment. In the recesses on the outer surface of the housing, the main rollers are placed on the axes, the upper ends of the axes being detachably mounted in the housing with limited outward movement to the operating position, and the lower ends in the hinged supports with the possibility of rotation in a plane passing through the longitudinal geometric axes of the housing and clips. In the central channel of the housing is placed a hydraulic annular piston with o-rings, having a pusher that is configured to extend the rollers to the working position.

What is new is that the annular piston above the casing is provided with a connecting thread, above the recesses of the casing upper recesses are made for additional rollers mounted on the upper axes, which are articulated with their lower ends to the upper ends of the axes of the main rollers. The upper ends of the axes interact with the housing with the possibility of limited radial movement out. In the working position, the angle of deviation from the axis of the housing of the upper axes is less than the lower axes, or equal to zero, while the pusher is equipped with rotating upper and lower bushings, which are made with the possibility of interaction from the inside, respectively, with additional and main rollers. A sample is made inside the casing, and the piston above the sealing rings is equipped with a spring-loaded lock that interacts in the transport position with the housing sample, between the piston and the housing above the lock, a pressing sleeve is sealed with the possibility of longitudinal movement downward and interaction with the lock to push it inward, and the cavity between the housing and the piston above the pressing sleeve communicates with the Central channel of the piston.

Figure 1 shows a device for expanding pipes in a well in a transport position with a partial longitudinal section; figure 2 is the same when expanding the pipes in the well.

A device for expanding pipes in a well consists of a housing 1 (Fig. 1) with a central channel 2, a thread 3 for connecting to downhole equipment (not shown) and recesses 4 on the outer surface, in which the main tapered rollers 5 are mounted on axles 6 The upper ends 7 of the axles 6 are placed in the housing 1 with the possibility of limited movement outward to the working position, and the lower ends 8 of the axles 6 are placed in the hinged supports 9 with the possibility of rotation in a plane passing through the longitudinal geometric axes of the housing 1 and the roller pegs 5, and removal from the hinges 9 if replaced.

In the central channel 2 of the housing 1, a hydraulic annular piston 10 is sealed, provided with a sealing ring 11 and a pusher 12, which is configured to extend the rollers 5 to the working position. The piston 10 above the housing 1 is provided with a connecting thread 13 for connection with a drill pipe string (not shown).

Above the recesses 4 of the housing 1, the upper recesses 14 are made for additional rollers 15 mounted on the upper axles 16, which are connected by their lower ends 17 with hinges 18 to the upper ends 7 of the axles 6 of the main rollers 5. The removable sleeve 20 of the housing 1 limits the radial outward movement of the upper the end 19 of the axis 16. The pusher 12 is equipped with a rotating upper 21 and lower 22 bushings.

In the working position, the angle of deviation from the central axis of the housing 1 (Fig. 2) of the upper axles 16 is less than the lower axles 6, or equal to zero, while the rotating upper 21 and lower 22 of the pusher sleeve 12 interact from the inside, respectively, with the rollers 15 and 5.

A sample 23 is made inside the housing 1 (Fig. 1), and the piston 10 above the sealing rings 11 is equipped with a clamped spring 24 to the outside with a latch 25, which interacts in the transport position with a sample of the housing 23. Between the piston 10 and the housing 1 above the latch 25 there is a pressing sleeve 26 with a sealing collar 27, with the help of which a longitudinal movement downwardly of the pressing sleeve 26 and its interaction (for example, by means of a chamfer 28) with a latch 25 for pressing it inward. The cavity 29 between the housing 1 and the piston 10 above the pressing sleeve 26 is communicated with the Central channel 30 of the piston 10 through the side holes 31.

The device operates as follows.

In the pre-expanded interval 32 (Fig. 2) (drilling complication zone) of the well 33, the profile pipes 34 are lowered and expanded by creating internal hydraulic pressure until their walls are pressed against the wall of the expanded portion 32 of the well 33. Then, the device is connected to the thread 13 of the piston 10 with drill string, and using thread 3 of the housing 1 with downhole equipment (centralizer, head, emphasis, etc.), after which the entire structure is lowered into the well 33.

When the device reaches the upper end of the pipes 34, the drill string begins to rotate while simultaneously creating an axial load and flushing the pipe cavity by pumping fluid through the drill pipe string, the central channels 30 and 2 of the piston 10 and the housing 1, respectively. Under the influence of the pressure drop created by narrowing 35 of the central channel the piston 10 or hydraulic resistance of the downhole equipment (not shown), the fluid passes through the lateral hole 31 of the piston 10 into the cavity 29, while the sealing collar 27 together with second sleeve 26 moves down. The pressing sleeve 26, acting on the retainer 25 by the chamfer 28, moves it inside the piston 10 from the sample 23 of the housing 1, compressing the springs 24, releasing the housing 1, which moves upward through the sealing ring 11 up to the stop in the piston 10 or in the outer ring stop 36 (for the ability to adjust the stroke of the housing 1 relative to the piston 10) located on the piston 10 above the housing 1.

At the same time, the pusher 12 of the piston 10 moves the rotating sleeves 21 and 22, interacting with the additional 15 and the main 5 rollers. In this case, the axes 16 and 6, respectively, rotate their lower ends 17 and 8 in the hinges 18 and 9, and the upper ends 19 and 7, as well as the lower end 17 of the axis 16 are raised in the radial direction, leading the rollers 15 and 5 from the samples 14 and 4 of the housing 1 to working position. In the operating position, the deviation angle from the axis of the housing 1 of the upper axles 16 is less than the lower axles 6, or equal to zero.

With further rotation of the drill pipe string, the walls of the pipes 34, which were not pre-hydrated, are straightened until they are pressed firmly against the walls of the expanded section 32 of the well 33. The radial load acting on the rollers 5 and 15 closes on the rotating sleeves 22 and 21. The total axial load on axis 6 and 16 decreases, increasing up to 3 times the operability of the device to critical wear of the axles 6 and 16. Moreover, the additional rollers 15, due to the specially selected length of the calibrating section, exceeding the difference in pitch the grooves in the pipe body 32 and the length of the calibrating section of the main roller 5, calibrate and smooth the profile pipes 34 previously expanded by the rollers 5 to the required diameter. If the rollers jam, the fluid circulation and rotation are stopped and the device is pulled up, resulting in a piston 10 with a pusher 12 and bushings 21 and 22 are pulled out of the housing 1 with rollers 5 and 15, which with axes 6 and 16 move inward, freeing the device. If necessary, further work, the circulation of fluid and the rotation of the device resume and work continues.

After completion of the work, the complete assembly of the device is removed from the well 33. After that, parts of the device are inspected and, if necessary, the worn rollers 5 and / or 15 are replaced.

The proposed device due to the reduction of radial loads on the axis of the rollers can reliably and accidentally expand profile pipes. Material costs associated with the breakdown of the housing due to torque, wear and replacement of the axles of the rollers are excluded. Emergencies associated with jamming of rollers on the axles due to the joint rotation of the rollers and bushings by rolling friction during operation of the device are also excluded. In addition, due to the increased calibrating surfaces of the additional rollers, the required diameter of the expandable pipes is provided even with large axial feeds of the tool.

Claims (1)

A device for expanding pipes in a well, including a housing with a central channel, a thread for connecting to downhole equipment and recesses on the outer surface, in which the main rollers mounted on the axles are located, the upper ends of which are detachably mounted in the housing with limited outward movement into the working position, and lower ones - in hinged supports with the possibility of turning them in a plane passing through the longitudinal geometric axes of the housing and rollers, a hydra is placed in the central channel of the housing an annular piston with o-rings, having a pusher that is capable of extending the rollers to a working position, characterized in that the annular piston above the housing is provided with a connecting thread, above the recesses of the housing there are upper recesses for additional rollers mounted on the upper axles, which are lower the ends are pivotally connected to the upper ends of the axes of the main rollers, and the upper ones to the housing with the possibility of limited radial movement outward into the working position moreover, in the working position, the angle of deviation from the axis of the housing of the upper axes is less than the lower axes, or equal to zero, while the plunger is equipped with rotating upper and lower bushings, which are configured to interact from the inside, respectively, with additional and main rollers, while in the case from the inside sampling is made, and the piston above the o-rings is equipped with an outwardly spring-loaded lock that interacts in the transport position with the housing sample, hermetically installed between the piston and the housing above the lock on the pressing sleeve with the possibility of longitudinal movement down and interacting with the latch to press it inward, and the cavity between the housing and the piston above the pressing sleeve is in communication with the central channel of the piston.

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