SU1599522A1 - Device for cutting pipes in well - Google Patents

Abstract

The invention relates to mining. The goal is to make it possible to cut pipes into sections without removing the device to the surface while simplifying the design. For this purpose, the drive of radial movement of the incisors is made in the form of an electromagnet 20 mounted on the hollow stem 4 above the incisors, telescopically connected cores and two cases 23, 25 mounted above the incisors rotatably relative to each other. One of the cases is axially displaced relative to the cutting unit shaft 29 and is hingedly connected to the cutters 33 by means of levers. The other holder is mounted with the possibility of axial movement relative to the hollow rod 4 and is rigidly connected with its upper part to the core of the drive for the radial movement of the cutters. The rotation drive of the incisors is connected with the shaft 29. The fixing unit of the device in the well is made in the form of electromagnets placed on a string of pipes. During operation, the cutters are loaded unevenly. The greatest load is experienced by one that, due to random deviations of dimensions, is advanced more than others and is most likely its failure. The remaining incisors continue cutting. Therefore, it is advisable to increase the number of incisors to 5-6 or more. Whether cutting occurs in standard or emergency mode is judged by the magnitude of the current or the pressure of the energy carrier. 2 Il.

Description

The invention relates to mining, in particular to devices for cutting pipes for the purpose of their subsequent extraction from wells, mainly water-lifting ones, and May be used in mining and construction with

The purpose of the invention is to provide the possibility of cutting pipes into areas without removing the device to the surface while simultaneously simplifying the structure.

Figure 1 shows the upper part of the device; fig2 - lower part of the device

Motor 1 — drive for rotation of the incisors — attached to a string of pipes 2 which is connected to a lifting device (not shown) with the upper end; Motor 1 is connected to a gearbox, for example, a planetary or wave gear, having a fixed body Zo A hollow rod 4 is attached to body 3 To the string of pipes 2 and the hollow rod 4, respectively, are pivotally attached the levers of the top 5 and folding 6 of the device fixing unit in the borehole, securing the device for cutting inside the pipe to avoid radial oscillations and turns during operation. The column of pipes 2 and the hollow rod 4 carry plastish 7 and 8 rigidly attached to them, on which electromagnets are installed in the form of pairs of electromagnetic coils 9 and 10 o. One of the two electromagnetic coils 9 is placed on the plate 7 from above, the other from below. Electromagnetic coils 10 are also placed on a plate 8 "In electromagnetic coils

25

thirty

35

20 40

45

50

five

9 and 10 are telescopically mounted cores 1I and 12 with protrusions 13 and 14 pivotally connected to levers 5 and 6. Springs 15 and 16 are connected at one end to levers 5 and 6 and the other to fixed parts of the device; pipes 2, engine 1. hollow rod 4 so that. create forces opposing the force of electromagnets and squeezing levers from the casing 17,

On the hollow rod 4 there is a groove, on which the upper shelf 18 FIGO2 is mounted, pressed by a nut 19o. On the upper shelf 18 are mounted the electromagnet 20 of the radial movement unit of the cutters. The cover 22, which, like the holder 23, is put on the splines 24, milled at the lower end of the hollow rod 4, Krischka 22 is attached to the holder 23 with bolts. A bearing 26, radial or radially-resistant, is placed between the holder 23 and the holder 25. 25 oyme bottom cover is attached by bolts 27, a central hole is fitted on shli- ijjsi 28 are milled on a shaft 29, communication-bonded driven rotating cutters. The shaft 29 is telescopically positioned to provide a clearance inside the hollow rod 4. A nut 30 with bevels 31 is screwed onto the lower end of shaft 29, with bevels 31 on which the mandrels 32 with cutters 33 rest in the initial position. The nut 30 fixes the holder 34 on the shaft 29. Holder 34 maybe

made in the form of a ring-shaped part — with slots for hinges or in the form of clamps, boltable.

Thus, the shaft 29 and associated with it the holder 25, the bracket 27, the nut 30 of the mandrel 32 with the cutters 33 and the holder 34, as well as the fasteners and levers connecting them, can rotate Hollow stem 4 and its related parts, including the yoke 23 and the bolt 22 do not rotate about the liner cavity is protected from contamination by seals The threaded joints are locked by a known method. The hinge axes are fixed by a known method. and which is depicted in FIG. 2 by a dash-dotted line, crossed the outer surface of the 7o casing pipe. From the same consideration, choose the dimensions of the parts through which the cutting motion Mo is transmitted.

Communications through which current flows to the motor and electromagnets in FIGS. I and 2 are not shown. Not electric motor and electromagnets can be used, but pneumatic, hydraulic and other devices. If a low-speed drive is used to communicate the cutters with the required cutting speed, the gearbox 3 is not obscured. The drawings show two electromagnet coils of the electromagnet 20 and two cutters 33, but this quantity may be different

With a large depth of the well, the string of pipe 2 may consist of several parts connected by couplings

The device for cutting pipes in the well works as follows

The device is lowered into the casing I7 to the desired depth and electromagnets 9 and 10 are turned on. Cores 1 1 and 12 are retracted, levers 5 and 6 burst the device in the casing 17, overcoming resistance of springs J5 and 16 o Turn on the engine 1, shaft 29 and cutters 32 start to rotate - with „Turn on electromagnets 20, as a result, a force directed upwardly acts on rods 21. Through the lid 22, the holder 23, the bearing 26,

the clip 25, the cover 27, levers, hinges. and the mandrel 32 this force is transmitted to the incisors. The rotation of the incisors is added upwards, the incisors cut out a cylindrical segment, outlined. dash-dotted line, and cut the tube. In this case, the moving parts slide along the slots 24 JO 24 and 28, after the end of cutting, which is determined by the current drop, if electric power is used, or pressure, if another energy carrier is used, turn off the motor J5 b Switch off the electromagnets 20, moving parts, slippers along slots 24.28, are lowered to their original position under the action of their own weight. Electromagnets 9.10 are turned off. 5.6 levers 20 20 depart from the walls of pipe 17 under the action of springs 15.16. The pipe cutting device is removed from the pipe or moved to a new position. .

During operation, the cutters are loaded 25 unevenly. The greatest load is experienced by one that, due to random deviations of dimensions, is advanced more than others. Most likely it is his failure. The remaining 30 incisors continue cutting. Therefore, it is advisable to increase the number of incisors up to 5-6 or more. Whether cutting occurs in standard or emergency mode is judged by 2 current values or the pressure of the energy carrier. It is advisable to use emergency engine protection, which can work, for example, when the support is jammed. Namely, on Q this case, the slits 24 are needed, which prevent the turning of the holder 23 and the spreading of the breakdown to other upstream parts. In standard mode, the torque transmitted through the slots 24 is mald

The device can be used not only to cut the lower cemented section of the pipe, but also to cut the pipe into section Q with a length of 10–20 m and step them out with small efforts.

Claims (1)

An invention of a device for cutting pipes in a well including a pipe string, a cutting assembly associated therewith, a hollow rod, a telescopically mounted shaft and cutting pliers connected to the shaft, a rotary and radial displacement cutters and a fixing device in a Well. , in order to ensure that it is possible to cut pipes into sections without removing the device to the surface while simplifying the design, the drive of the radial movement of the incisors is made in the form of an electromagnet mounted on the hollow stem over the {incisors of the electromagnet, telescopic pi mounted over the cutters with the possibility of rotation of each relative to each of the clips, one of the clips is mounted for axial movement relative to the shaft of the cutting unit and pivotally connected to the cutters by means of levers, and the other is mounted for axial movement of the hollow rod and rigidly its upper part is connected with the cores of the drive for the radial movement of the incisors, the rotational drive of the incisors is connected with the shaft of the cutting unit, the fixation unit of the device in the well made in the form of electromagnets placed on a column of tubes, telescopically mounted cores with opposite sides of each electromagnet and the last levers 6, one ends of the levers of the fixing device in the well are spring-loaded relative to the pipe string, while others are hinged to it, 5J Phie.1