RU21929U1 - DEVICE FOR LAUNCHING AND LIFTING OF LONG-LENGTH STEEL PIPE - Google Patents

Description

Device for lowering and lifting a long steel pipe.

The utility model relates to the mining industry, and in particular to devices for lowering and lifting sleeveless long pipes and can be used in installations for repairing wells using coiled tubing technology.

The known mechanism for lowering and lifting continuous steel pipes and rods, containing a drive mounted on the frame, two traction chains rotating on the upper supporting and lower drive sprockets and a clamping unit, including walls and elastic cylinders 1.

The traction chain consists of links connected by rollers, on which pads are loosely dressed, interconnected by elastic retainers, fixing the pads in the required position.

A disadvantage of the known device is the complex and unreliable design of the clamp, as well as the complex design of the chains.

A device is also known for introducing into the well and extracting from the well flexible pipes wound on a drum, comprising a housing in which sprockets are mounted at some distance from each other on shafts connected to one of the motors, on which closed opposed chains of the conveyor 2 rotate Closed conveyor chains are located between the guides made in the form of separate plates and used to equalize the chain tension. Closed conveyor chains contain driving (tensioning) sprockets for chain tension and driven chain sprockets. Each part of the conveyor consists of a pair of roller chains and blocks of pads of the pipe gripper located between them, connected to each other by means of elongated cylindrical pins.

The pads are made in such a way that they are embedded one into the other. Each block is equipped with a bearing located in a groove made in the center of the block, mounted on a stud and has on the surface facing

E21B 19/22

pipe, an arched recess with a radius of curvature only slightly larger than necessary for crimping the pipe.

The use of the known device is advisable for small pipe diameters and small efforts arising during the repair work. When using large diameter pipes (for example, during drilling), and, accordingly, a larger mass, the load-bearing capacity of the device increases, which can be improved by optimizing the contour and dimensions of the surfaces of the shoe pads in contact with the pipe, as well as by increasing the pipe gripping arc and the pressing force of the gripping elements chains.

The disadvantages of the known device include the complex design of the circuits, requiring compensation of the forces exerted on the pipe in the modes of entry and exit into contact with the pipe, as well as the use of bearings with a greater load capacity. In addition, the device cannot be used for pipes of different diameters.

The problem solved by the utility model is to simplify the design of circuits by optimizing its contours and sizes, increasing reliability, as well as expanding the technological capabilities of the device by using it for pipes of various diameters.

This goal is achieved by the fact that in the device for lowering and raising a long steel pipe, including a gearbox, parallel closed drive conveyors located at a distance from each other in the guide sprockets, containing two drive roller chains and pads with bearings between them, connected by a common axis, each block made with support in the middle part between two grooves in which the bearings are located. A T-shaped groove is made on the working surface of the block, and the liner has a corresponding T-shaped protrusion located in the said T-groove, the liner being slightly less than or equal to the pitch of the roller chain. The working surface of the liner has a radius of curvature corresponding to the outer diameter of the pipe.

The ki, with bearings located in its grooves and a support between them, allows not only to quickly change the liners for each pipe size, but also to maximize the length of the liner and bring it to a size equal to the chain pitch and thereby maximize the use of the pipe gripping zone. When using such a design of pads with inserts in the zone of entry and exit of the pipe from the conveyor, the pads smoothly contact the pipe without cutting the metal insert into the pipe body, which eliminates damage to the pipe.

The use of a support in the middle of the block between the two grooves in which the bearings are located allows to reduce the load on the axis connecting the roller chains to the block and to strengthen the dangerous section along the axis of the block, thereby increasing the reliability of the drive conveyor, as well as reducing the height of the block, and the use of two bearings instead of one, it allows the use of bearings of lower bearing capacity.

A specific example of the implementation of the utility model is illustrated by drawings, where:

in FIG. 1 - shows a device, General view;

in FIG. 2 - drive conveyor;

in FIG. 3 is a section AA of FIG. 2;

in FIG. 4 is a section BB of FIG. 2.

The device consists of a base 1, on which a frame 2 and a housing 3 are fixed, including a gearbox 4 with hydraulic drive motors 5, mounted on a column 6. On the 2 drive shafts 7 of the gearbox 4 located at a distance from each other, drive sprockets 8 are fixed, on which two symmetrically located closed drive conveyors 9 rotate. The drive conveyors 9 are tensioned by means of tension sprockets 10 connected by two pairs of hydraulic cylinders And fixed in the housing 3.

Between two closed drive conveyors 9 is a long steel pipe 12.

yen with 5 pairs of hydraulic cylinders 15, regulating the pressure of the drive conveyors 9 to the pipe 12.

Drive conveyors 9 (Fig. 2, 3, 4) are two rows of standard drive roller chains 16 connected by a common axis 17, between which the pads 18 are located.

In the block 18, two grooves are made with a support 19 between them in the middle of the block, and bearings 20 are mounted in the grooves of the block on the axis 17. The presence of the support 19 allows to reinforce the dangerous section along the axis 17 and reduce the height of the block 18. The blocks 18 are made so that they are engaged with each other. On the working surface of the block 18 having an arcuate recess, a T-shaped groove is made, which includes a removable metal insert 21 having a corresponding T-shaped protrusion, and a radius of curvature corresponding to the radius of the outer surface of the pipe 12.

The length L of the liner 21 is designed in such a way as to bring it as close as possible to the value H equal to the pitch of the drive roller chains 16, while reducing the clearance C between the two blocks 18 to the minimum possible structural dimensions.

The device operates as follows. The pipe 12 is inserted into the device and is located between the drive conveyors 9. In this case, the drive conveyors 9 are pressed to the pipe 12 by five pairs of hydraulic cylinders 15 through the rigid guides 13 in the zone 22. The drive sprockets 8 are driven through the gearbox 4 when hydraulic oil is supplied to the hydraulic motors 5. When this occurs, the up or down movement of the drive conveyors 9 in conjunction with the pipe 12.

At the same time, in the zones 23 (the input and output of the pipe 12 comes into contact with the drive conveyor 9), the pipe 12 touches the pads 18. Moreover, due to the fact that the length L of the working surface of the metal liner 21 is less than the step of a standard roller chain 16, there is no kinematic insertion of the metal insert 21 into the body of the pipe 12 and it smoothly comes into contact with the pipe 12. When the device is in operation, the pipe 12 is aligned due to the presence of rigid guides 13.

Upon completion of the work on the descent / raising of the pipe 12, the hydraulic motors 5 are turned off.

Ill USSR Author's Certificate No. 785458, publ. 12/07/80, Bulletin No. 45, 1980

/ 2 / US Patent No. 4585061, publ. 04/29/86, declared 10/18/83 NKI 166/77

Claims (2)

1. A device for lowering and lifting a long steel pipe, including a gearbox, parallel sprocket drive conveyors spaced apart from each other by guide wheels, containing two drive roller chains and pads with bearings between them, connected by one axis, characterized in that each block is made with support in the middle part between two grooves in which the bearings enter, and a T-groove is made on the surface of the block, and the insert has a T-shaped protrusion located in said T-groove, moreover, the liner length is less than or equal to the pitch of the drive roller chain. 2. The device according to claim 1, characterized in that the working surface of the liner has a radius of curvature corresponding to the radius of the outer surface of the pipe.