A hydraulic telescopic segment milling side drilling tool

Abstract

The invention relates to a hydraulic telescopic-type section milling sidetracking tool which is used for oil and gas field well drilling and well repair construction operation sidetracking technologies. According to the technical scheme of the hydraulic telescopic-type section milling sidetracking tool, a threaded joint constitutes a central mechanism together with an upper joint, a middle joint,an upper mandrel and a lower mandrel; a returning hydraulic cylinder constitutes an external mechanism together with a main piston, a main cylinder, a sliding key sleeve, a lower joint and a centralizing short joint; the external mechanism and the central mechanism are nested together and connected through a shear pin between the returning hydraulic cylinder and the upper joint; a nozzle is mounted at the bottom of the lower mandrel, and the nozzle and the lower mandrel are fixed through a screw plug; section milling cutters are evenly distributed at a window in the middle of the lower joint,and a pin core shaft is machined at the window in the middle of the lower joint; and the upper ends of the section milling cutters are connected with the lower joint through the pin core shaft, cutterpositioning pins and pin hole check rings. According to the hydraulic telescopic-type section milling sidetracking tool, it can be ensured that the section milling cutters are smoothly expanded to the effective positions, casing section milling is more thorough, the scaling phenomenon in casing section milling is avoided, the demands of deep wall casing section milling sidetracking working conditions can be met, and the hydraulic telescopic-type section milling sidetracking tool is used for sidetracking operation.

Description

technical field [0001] The invention relates to a hydraulic telescopic section milling sidetracking tool used in the sidetracking technology of oil and gas field drilling and workover construction operations. Background technique [0002] Casing section milling window sidetracking is to use casing section milling tools to cut off the casing from the expected position, then mill a section of casing (generally 30-50 meters), and then drill cement plugs in the section milling section for 40-60 meters Wait for 48 to 72 hours, then lower the drill bit to drill the cement plug to the predetermined sidetracking point, and finally lower the directional drilling assembly to implement the open hole directional sidetracking process, which can realize the re-completion of old wells, abandoned wells, and accidental wells in the middle and later stages of development For the purpose of remaining oil and gas reservoirs, casing section milling windows are also called omni-directional window...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to improve the success rate of section milling sidetracking and meet the requirements of deep well casing section milling in order to solve the phenomenon of section milling casing stripping caused by section milling cutters not being able to open to the effective position during deep well section milling sidetracking construction. To meet the needs of drilling conditions, a hydraulic telescopic segment milling sidetracking tool is specially provided

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