Kilometer-depth L-shaped ground pre-grouting drilling tool assembly applied to hole drilling and hole drilling process

Abstract

The invention discloses a kilometer-depth L-shaped ground pre-grouting drilling tool assembly applied to hole drilling, and a hole drilling process which is a kilometer-depth L-shaped ground pre-grouting hole drilling process. The kilometer-depth L-shaped ground pre-grouting hole-drilling drilling process comprises straight hole section drilling, whipstocking section drilling and horizontal section drilling, wherein the whipstocking section drilling comprises whipstocking section drilling of a deviation angle being equal to or larger than 45 degrees and whipstocking section drilling of a deviation angle being equal to or smaller than 45 degrees; during the whipstocking section drilling, on the premise that the build-up rate meets a design requirement, the drilling tool assembly is exchanged and composite drilling of 2m is performed after each drilling of the length of one single drill pipe is performed; when each drilling of the length of 2-3 drill pipe stands or pure drilling over 24 hours is performed, short trip of 10-15 drill pipe stands is completed. According to the kilometer-depth L-shaped ground pre-grouting drilling tool assembly applied to hole drilling and the hole drilling process, kilometer-depth shaft horizontal drift surrounding rock modified ground pre-grouting hole-drilling construction requirements are met, problems that stone dust up-hole resistance is large, trip difficulty is large, drill pipe sticking and hole collapse occur and the like when hole drilling is performed in a horizontal oriented section are solved, and fatigue failure to a drilling tool due to stress and strain under a drilling pipe rotation condition is reduced.

Description

technical field [0001] The invention relates to the field of mining machinery, in particular to a drilling tool assembly and a drilling process for a thousand-meter-deep L-shaped ground pre-grouting drilling. Background technique [0002] The ground pre-grouting technology for modifying the surrounding rock of the thousand-meter-deep horizontal roadway refers to the use of high-precision drilling trajectory control technology to perform ground pre-grouting modification on the unstable and broken surrounding rock of the underground horizontal roadway through deep well horizontal grouting drilling. In order to enhance the integrity of the surrounding rock of the roadway, improve the mechanical properties of the surrounding rock, improve the overall stability of the surrounding rock mass of the relevant coal mine roadway and chamber, reduce the difficulty of roadway support, and ensure the safety of underground construction activities. [0003] The ground pre-grouting construct...

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Problems solved by technology

[0006] In view of this, the present invention is to provide a drilling tool assembly and drilling technology for L-shaped ground pre-grouting drilling at a depth of one thousand meters, which not only meets the construction requirements of the ground pre-grouting drilling with modified ground in the horizontal roadway of a thousand-meter-deep shaft , which solves the problems of large back-up resistance of rock powder, difficulty in tripping, drill sticking and hole collapse when drilling to the horizontal orientation section, and reduces the stress and strain fatigue damage of drilling tools under the condition of drill pipe rotation

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