Multi-layered sleeve windowing milling shoe

Abstract

The invention provides a multi-layered sleeve windowing milling shoe. The milling shoe is constituted by a milling shoe blank, a pressure transmission sleeve, a pressure transmission plug, a bronze tube, and a pilot hole milling shoe; and the upper part of the milling shoe blank is in a shape of a drill rod fastener and is connected with an upper part drilling tool. The milling shoe is characterized in that, the milling shoe blank is of a hollow structure; a ledge is arranged at the upper end of the inner wall of the milling shoe blank; an annular groove is formed in the middle part of the outer wall of the milling shoe blank and forms an annular gap with the inner wall of the milling shoe blank; a pressure plug hole is formed in the upper end of the milling shoe blank and penetrates through the blank to communicate with the annular groove; and a flexible milling shoe is fixed on the circumference of the lower end outer surface of the milling shoe blank, and the pilot hole milling shoeis fixed at the bottom of the blank. According to a unique production design of the multi-layered sleeve windowing milling shoe, in the drilling process, liquid inside and liquid outside a drilling pillar communicate with each other, and well control safety is ensured because the inside communicates with the outside of a drilling tool; and even in case of well control risks, circulating equipressure well treatment is convenient to conduct. The unique design of the pilot hole milling shoe and the flexible milling shoe improves the milling speed and enhances the milling stability.

Description

technical field [0001] The invention belongs to the technical field of petroleum operation equipment, and in particular relates to a multilayer casing window grinding shoe. Background technique [0002] During the window opening operation, double-layer and multi-layer casing windows are often encountered. Due to the influence of the size, wall thickness, steel grade strength of each layer of casing, and the distance between two adjacent layers of casing, the double-layer casing has more The length of the window opening window of the layer casing increases, the difficulty of forming the window increases, and the accidents of sidetracking without technical casing occur frequently. The window opening efficiency and success rate of this type of casing using the existing grinding shoe window opening are very low and cannot be achieved The required fenestration standard. Contents of the invention [0003] The invention aims at overcoming the deficiencies of the prior art, and p...

AI Technical Summary

Problems solved by technology

[0002] During the window opening operation, double-layer and multi-layer casing windows are often encountered. Due to the influence of the size, wall thickness, steel grade strength of each layer of casing, and the distance between two adjacent layers of casing, the double-layer casing has more The length of the window opening window of the layer casing increases, the difficulty of forming the window increases, and the accidents of sidetracking without technical casing occur frequently. The window opening efficiency and success rate of this type of casing using the existing grinding shoe window opening are very low and cannot be achieved required fenestration standard

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