SU1433749A1 - Hydraulic apparatus for dismantling downhole motors - Google Patents

Abstract

The invention relates to the field of mechanical assembly production, to devices for disassembling press joints. The goal is to increase productivity and reduce size by ensuring the continuity of the repressing process at optimal speeds. The downhole motor to be disassembled is adapted by means of subs 9 and 10 by gripping units 5, 6 to movable cross-beams 3, 4. Pressure is first supplied to pistons (П) 13, 14, and after they end of the working stroke - to П 15,16, then to P 17, 18. The process of pressing out goes with all the speed. By making P 14, 16,18 with diameters different from diameters symmetrically arranged by P 13, 15, 17, the number of possible extrusion speeds increases. 1 hp f-ly, 2 ill. Cl

Description

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This invention relates to a mechanical assembly production, namely, devices for disassembling press joints in large-sized long-length units such as downhole motors.

The aim of the invention is to increase productivity and reduce the size of the device.

The goal is achieved by ensuring the continuity of the repressing process at optimal speeds, for which the device is equipped with two additional telescopic power cylinders with piston diameters different from those of the corresponding main ones.

FIG. 1 schematically shows a hydraulic device for disassembling a downhole motor, a plan view; in fig. 2 - special device (cassette), used when removing the shaft from the turbine and during assembly

turbines.

The hydraulic device comprises a frame 1, a fixed yoke 2, movable yokes 3 and 4, gripping units 5 and 6, controlled by auxiliary power cylinders 7 and 8, and subs 9 and 10 for connecting

the body and shaft of the downhole motor with crossbars 3 and 4, two pairs of power cylinders (main and additional) 11 and 12, placed symmetrically with respect to the P – P plane passing through the fixed crosshead 2 perpendicular to the longitudinal axis of the T – T extrusion telesko25

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The sub 10 is screwed onto the case of the downhole motor 25, and the sub 9 is on its shaft, after which the downhole motor is attached to the crossheads 3 and 4 by the grippers 5 and 6 (gripping dies) controlled by the auxiliary power cylinders 7 by means of the subs 9 and 10 and 8. Then the electric motor of the pump 22 is turned on, which supplies the working fluid (oil) through the hydraulic distributor 23 to the hydraulic chambers A and B of two pairs placed symmetrically on the traverse 2 of the power cylinders 11 and 12. Two pairs of pistons 13 and 14 of the largest diameter move in opposite directions. ozhnye hand and pushing two pairs of pistons 16 and cylinders 15 and rods 19 and 20 with cross members 3 and 4. In this case, to the housing 25 and the shaft 27 with the turbine 26 prilagayuts forces directed in opposite directions. First there will be a repressing, the body 25 is torso. In power cylinders of size-40 vets from turbine 26 (will move), posg

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27, a nut 28, fastening the turbine 26 on the shaft 27 and the nipple securing the turbine 26 in the housing 25 (in Fig. 1, the nipple is not shown),

A special device (cassette) 29 shown in FIG. 2 is attached to the hydraulic device for removing the shaft 27 from the turbine 26, as well as detachable support sleeves 30 and 31 for disassembling very short downhole motors (4-3 m long or less ).

Hydraulic device works as follows.

The sub 10 is screwed onto the case of the downhole motor 25, and the sub 9 is on its shaft, after which the downhole motor is attached to the crossheads 3 and 4 by the grippers 5 and 6 (gripping dies) controlled by the auxiliary power cylinders 7 by means of the subs 9 and 10 and 8. Then the electric motor of the pump 22 is turned on, which supplies the working fluid (oil) through the hydraulic distributor 23 to the hydraulic chambers A and B of two pairs placed symmetrically on the traverse 2 of the power cylinders 11 and 12. Two pairs of pistons 13 and 14 of the largest diameter move in opposite directions. ozhnye hand and pushing two pairs of pistons 16 and cylinders 15 and rods 19 and 20 with cross members 3 and 4. In this case, to the housing 25 and the shaft 27 with the turbine 26 prilagayuts forces directed in opposite directions. At first there will be a raspressovka, the case 25 is tor

Two pairs of pistons of the largest diameter 13 and 14, two pairs of cylinders - pistons of average diameter 15 and 16, two pairs of pistons of the smallest diameter 17 and 18, the rods of which 19 and 20 dZ are connected with movable cross-beams 3 and 4, a hydraulic power unit 21, containing pump 22 with a drive, a hydraulic distributor 23 connected by pipelines 24 to cylinders 798.11 Q and 12. Hydraulic chambers A, B, C, D, E, F, K, L are between the housings of the power cylinders 11 and 12 and their pistons , M. In rods 19 and 20 are made from which the force required for decompression decreases sharply and the speed of movement rshney 13 and 14 increases. The working fluid from the hydraulic chambers B, D, D, E, G and K is discharged into the tank (not shown) through pipelines 24 through the hydraulic distributor 23. Since the piston stroke 13 and 14 is short (about 0.1-0.15 m ), pistons 13 and 14 quickly press into protrusions of cylinder bodies 11 and 12, and in hydrochambers A and B the pressure will increase sharply, the channels will switch to the hydraulic distributor 23 and the working fluid

versts H and P for supplying the working fluid will go to the hydraulic chambers C and D, the drain

bones, in hydrocameras L and M under pistons of the smallest diameter 17 and 18.

Assembled downhole motor includes a housing 25, the turbine 26, the shaft

the channels from the hydrocameras A and B gfie this overlap. The cylinder-pistons 15 and 16 begin to move in opposite directions, and the pistons 13 and 14 remain in place, whereby the force required for repressing drops sharply and the speed of movement of the pistons 13 and 14 increases. The working fluid from the hydraulic chambers B, D, D, E, G and K is discharged into the tank (not shown) through pipelines 24 through the hydraulic distributor 23. Since the piston stroke 13 and 14 is short (about 0.1-0.15 m ), pistons 13 and 14 quickly press into protrusions of cylinder bodies 11 and 12, and in hydrochambers A and B the pressure will increase sharply, the channels will switch to the hydraulic distributor 23 and the working fluid

enters the hydraulic chamber C and D, drain

the channels from the hydrocameras A and B gfie this overlap. Cylinders-pistons 15 and 16 begin to move in opposite directions, and pistons 13 and 14 remain3

with in place. The repressing process continues at an increasing rate. When the piston-cylinders 15 and 1 reach the stop in the covers of the power cylinders 11 and 12, the pressure in them sharply increases, the channels in the hydraulic distributor 23 will switch and the working fluid will be supplied to the hydraulic chambers L and M under the pistons 17 and 18 through channels H and P , executed in the rods 19 and 20, the discharge of the hydraulic chamber B and T will also be blocked. The decompression process is accelerated again.

In this way, the turbine 26 with the shaft 27 is taken out of the casing of the downhole motor 25. The process proceeds continuously without stopping with a constantly increasing speed.

In the event that the forces developed by, for example, the pistons 17 and 18 of the smallest diameter turn out to be insufficient, then the cylinders-pistons 15 and

16 complete the reverse (idle) stroke JJfLH of this working fluid is drained from the hydraulic chambers C and D and fed to the hydraulic chambers D, E, L and M under the pistons

17 and 18 of the smallest diameter. Then close the channels H and P and open the drain channels from the hydraulic chambers D, E and supply the working fluid to the hydraulic chambers B and G. The cylinders-pistons 15 and 16 will again move in different directions and the process of depressing will continue.

After removing the shaft 27 with the turbine 26 from the housing 25, the latter is removed from the device, and the shaft 28 is unscrewed the nut 28 and the shaft with the turbine 26 and 27 is placed in the cassette 29 (Fig. 2), which is connected to the sub 10 and the decompression process and removing the shaft 27 from the turbine 26 is the same as the previous one. In this case, the discs of the turbine 25 are not dispersed after removing the shaft 27 from it,

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and remain in the cassette 29, in which they are transferred to the place of washing and sorting. The downhole motor assembly process takes place in reverse order.

Claims (2)

1. Hydraulic device for disassembling of downhole motors containing fixed fixed beam on the frame, two installed symmetrically with respect to the axis of the extrusion of telescopic actuating cylinders, the bodies of which are rigidly connected to the fixed crosshead, movable attachment mounted on the rods of the actuating cylinders, as well as gripping units , characterized in that, in order to increase productivity and reduce dimensions, it is equipped with two additional telescopic ram cylinders fixed to the building themselves on a fixed traverse symmetrically with respect to the main plane, perpendicular to the axis of the extrusion and passing through the fixed traverse, as well as an additional movable traverse mounted on the rods of additional power cylinders. 2. Hydraulic device according to claim 1, characterized in that the pistons of the additional telescopic power cylinders are made with diameters not equal to the diameters of the pistons of the respective stages of the main power cylinders. 25 thirty 35 40 45