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Multi-layered sleeve windowing milling shoe

A multi-layer casing and shoe grinding technology, which is applied in wellbore/well components, earth-moving drilling, etc., can solve the problem of sidetracking without technical casing, increasing difficulty in window formation, and low window opening efficiency and success rate. To meet the window opening standards and other issues, to achieve the effect of improving the milling speed and ensuring the safety of well control

Pending Publication Date: 2020-10-09
合力(天津)能源科技股份有限公司
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  • Abstract
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  • Claims
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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

Method used

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Embodiment Construction

[0014] The multi-layer casing window grinding shoe of the present invention is composed of a grinding shoe matrix 1, a pressure transmission sleeve 2, a pressure transmission plug 10, a copper pipe 11, and a pilot grinding shoe 14. The upper part of the grinding shoe matrix 1 It is connected to the upper drilling tool by the drill pipe buckle. The mill shoe matrix 1 is hollow and has a shoulder at the lower end of the inner wall. Close fit, the middle part of the outer wall is provided with an annular groove and the inner wall of the shoe carcass 1 to form an annular gap 17, which is convenient for the fluid to pass through the pressure. Ring 3 and lower sealing ring 4 are sealed, and positioning pin 9 passes through the carcass 1 of the mill shoe to fix the outer wall of the pressure transmission sleeve 2 with the carcass 1 of the mill shoe. On the same circumference of the outer wall of the upper end of the pressure transmission sleeve 2, there are four pick-up and delivery ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B29/06
CPCE21B29/005
Inventor 侯立东张鼎于紫迁
Owner 合力(天津)能源科技股份有限公司
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