Radial window cutting drilling device for downhole casing pipe of oil-water well

Abstract

The invention discloses a radial window cutting drilling device for a downhole casing pipe of an oil-water well. The drilling device comprises an up-down guide positioning unit, a rock stratum drilling unit and a radial window cutting unit, wherein the up-down guide positioning unit comprises a slip and a guide device, the rock stratum drilling unit comprises a joint, a rock stratum shell assemblyand a rock stratum piston assembly, and the radial window cutting unit comprises a window cutting piston assembly, a transmission mechanism and a window cutting drill bit. According to the drilling device, the curvature radius is small, radial window cutting of the downhole casing pipe steering in the horizontal direction can be carried out, a window cutting hole can be followed, roundtrip operation is not needed, the rock stratum drill bit is used for continuing to perform radical drilling on the rock stratum, the operation adaptability is high, the reliability is high, the efficiency is high, and the energy is saved.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling and production equipment, in particular to a radial window drilling device for an oil-water well downhole casing. Background technique [0002] At present, there are many techniques and methods for branch well drilling, including casing window drilling and milling sidetracking, preset window, open hole sidetracking, radial branch well method, expansion tube positioning measurement drilling and intelligent branch well, etc. The branch well has many advantages: improving the recovery rate, increasing the vertical opening degree of oil and gas layers, reducing drilling costs, reducing oil well management and environmental protection costs, and improving economic benefits. [0003] At present, there are two methods of window opening commonly used in oilfields: skewer window opening and section milling window opening. If the sidetracking formation is hard, the cementing quality is poor, the ...

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Problems solved by technology

[0003] At present, there are two methods of window opening commonly used in oilfields: skewer window opening and section milling window opening. If the sidetracking formation is hard, the cementing quality is poor, the downhole situation of the old well is complicated, the well deviation angle is large, and the casing and Casing centralizer is not easy to segment milling, and when the optional range of window opening points is limited, generally the tilter window opening method is used, otherwise the segment milling window opening method is usually selected; Steering in the horizontal direction in the wellbore affects the operating efficiency and accuracy of radial drilling

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