Multi-stage hydraulic cylinder internal tandem puller

Abstract

The invention belongs to the technical field of hydraulic mechanical drive and particularly relates to a multistage hydraulic cylinder inside serial connection type drawing device. The multistage hydraulic cylinder inside serial connection type drawing device comprises an upper externally-connected coupling, a short operating section, an upper hydraulic cylinder module, at least one lower hydraulic cylinder module, a cylinder barrel lower connecting pipe module and an executing mechanism, wherein the upper hydraulic cylinder module consists of a cylinder upper coupling, a liquid inlet thin-pipe sealing module and an upper hydraulic cylinder barrel, each lower hydraulic cylinder module consists of a cylinder barrel partition coupling and a lower hydraulic cylinder barrel, the cylinder barrel lower connecting pipe module consists of a lower partition coupling, a cylinder barrel lower connecting pipe and a cylinder lower connecting pipe plug hoop, symmetrical guide blocks and a guide block sleeve, and the executing mechanism consists of a thin liquid inlet pipe, a piston I, a piston rod I, a piston II, a piston rod II, an inner lower connecting coupling, an output end pull rod and a lower external connector. The multistage hydraulic cylinder inside serial connection type drawing device enables multiple hydraulic cylinders and the pistons to be connected in series, achieves a thin-long structure supercharging function, is suitable for small-diameter deep well object taking, dredging and jam release and is safe and convenient to use, and the number of the pistons and the number of the hydraulic cylinders can be increased or decreased according to the pressure demand.

Description

technical field [0001] The invention belongs to the technical field of hydraulic mechanical transmission, in particular to a serial puller inside a multistage hydraulic cylinder. Background technique [0002] In the oil field industry, it is often encountered in the handling of falling objects and stuck drill accidents in the salvage well, especially the salvage in the tubing requires special tools. To deal with drilling accidents, methods such as lame pressure reverse circulation, flushing the pipe, vigorous lifting, jacking, and reverse sleeve milling are often used. Due to the limited underground space, the above methods are not effective, and sometimes Several tools and several methods are used alternately, and the maintenance time is very long, especially when the casing is unpacked and repaired, the working pressure is quite high due to the need for a working pressure of more than 70Mpa, which is difficult for ordinary tools, which requires a Thin, long and full of te...

AI Technical Summary

Problems solved by technology

[0002] In the oilfield industry, it is often encountered in salvage well drop and stuck pipe accidents, especially the salvage in the tubing requires special tools, commonly used salvage tools include female cone, male cone, fishing spear, slipping canister, etc. To deal with drilling accidents, methods such as lame pressure, reverse circulation, pipe flushing, vigorous lifting, jacking, and reverse sleeve milling are often used. Due to the limited space in the well, the above methods are not effective, and sometimes Several tools and several methods are used alternately, and the maintenance time is very long, especially for the unblocking and trimming of the casing, because the working pressure is required to be above 70Mpa, which makes the working pressure quite high, which is difficult to achieve with ordinary tools, which requires a Thin, long and powerful tool to solve the problem of difficult downhole operation

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