SU1654530A1 - Pipe cutter - Google Patents

Abstract

The invention relates to the rehabilitation and repair of wells. The purpose of the invention is to increase reliability in operation by providing the possibility of intermittent interaction of the cutters with the body of the pipe being cut. The hydraulic cylinder 2 of the cutting tool control unit is rigidly connected to the housing 1 and has an additional hydraulic chamber 8 in the upper part. The latter is blocked in its upper part by a floating piston 4 The latter is rigidly connected to the lower part of the floor and rod 3, the free end of which is located in the 8 V hydraulic chamber the wall of the rod 3 is made channels for communication and use

Description

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11 t a string of drill pipes in the assembly of the n, t o and the well up to the bottom of the engine 1 | 1 pi and pipes 3jrtM turning on the pumps vr n) t i jiniiH 6vpi tnyy i rkpachi and 1 p boreshm Under the pressure of the exact fluid passed through t is the space between the body 1 5 tr / Güpe ia and the piston 13; in j two two Y PY1SDSh retts1 in working on oil by mm up to interdependence with the body of his fi

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You get half axial displacement (in it, the piston 13 of the sub-expansion unit assembly creates the necessary force on ujx 14 to cut the body of the JTQ pipe, and the position of the hollow rod will be

J5 KOI massif and pressure chamber n for chamber p of piston 4 piping down will be greater than the pressure of chamber c. At the same time as pc hollow rod 3 moves to its initial position

4 () my cutters 14 pipe cutters from additional

loads required to cut the pipe body. In these movements, the overpressure of chamber C is discharged into the annulus through radial holes 10, and chambers D through radial holes 11 blocked in the initial and working position by the piston 9. This process repeats periodically until the landing of the floating piston 4 on the upper end of the hollow rod 3.

Thus, periodically loading and unloading, the cutters of the pipe cutter retain their working capacity until the weapons fully loaded onto the working bodies are consumed, and the loading of the cutters with pauses (in self-oscillating mode) allows preventing their arms from breaking during the cutting from redistribution of stresses in the body pipes.

Claims (1)

Formula of the Invention A downhole pipe cutter comprising a hollow body with windows, cutters placed in the case windows, a cutter moving piston spring-loaded relative to it, a cutter displacement piston located on the piston of the cutters, located on the piston cutter in the form of a hydraulic cylinder with a piston and hollow stock, sealing F-bottom with IM, about the fact that, in order to increase the reliability of work with -ia, it is necessary to cut the pipe cutter due to obop, tschs and the possibility of intermittent cutting of i4 i cutters with cutter body aemoy ipvuu. The cylinder of the cutter pressure control unit is rigidly connected to the body and has an additional hydraulic chamber in the upper part. blocked by a floating piston in its upper part, the hollow rod being rigidly connected with its lower part to the incisor moving piston, the free end of the positive stem is located in the additional hydraulic chamber of the hydraulic cylinder, and channels in the original and working the positions of the additional hydraulic chamber with the piston chamber of the hydraulic cylinder, while in the supra-piston and sub-piston parts and additional 5 hydro-chamber of the hydraulic cylinder there are radial holes, the radial holes of above-piston and piston howl parts gidrotsipindra fluidly coupled to the annulus, and additional openings ra0 dially gidrokamery - with a cavity housing the piston of the hydraulic cylinder is at the top of a sleeve telescopically mounted on the additional gidrokamere (idrotsilindra sleeve 5 with a piston are installed with the possibility of overlapping in the initial and working positions of the radial orifices, respectively, of the additional hydraulic chamber of the hydraulic cylinder and the secondary part of the latter and with the valve. gh.) n kroPchp mentioned g dgalchych from i t AI D) hpdHI (M NGM LO / | 0 CHRNII {4IHJ with a single shchetch shch Ch., Chd, 11 holes in / widen-. h,: - 1, gidrotsn / indra Fig.Z