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Dual-power large-diameter step-type reaming drilling tool and method for directional holes in underground strata of coal mines

A dual-power, directional hole technology, applied in directional drilling, drill bit, earthwork drilling and production, etc., can solve the problems that affect the effective succession of the working face, restrict the preparation progress of the working face, prolong the drilling cycle, etc., and achieve lifting and reaming Drilling efficiency, save reaming drilling times, and shorten the construction period

Active Publication Date: 2019-11-05
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the specific implementation process, the existing multiple hierarchical hole reaming methods mainly have the following deficiencies: (1) the hole reaming efficiency is low
Each additional reaming means the extension of the drilling cycle, which restricts the preparation progress of the working face and even affects the effective replacement of the working face

Method used

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  • Dual-power large-diameter step-type reaming drilling tool and method for directional holes in underground strata of coal mines
  • Dual-power large-diameter step-type reaming drilling tool and method for directional holes in underground strata of coal mines
  • Dual-power large-diameter step-type reaming drilling tool and method for directional holes in underground strata of coal mines

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Embodiment Construction

[0036] See figure 1 , Shows the dual-power large-diameter stepped reaming tool for directional holes in underground coal mine rock formations of the present invention.

[0037] The dual-power large-diameter stepped reaming tool for directional holes in underground coal mines can be composed of a front guide 1, a primary reaming bit 2, a secondary reaming bit 3, a dual-power reaming tool 4, etc. The outer diameters of the guide 1, the primary reaming bit 2 and the secondary reaming bit 3 increase step by step.

[0038] Wherein, the front guide 1 can be screwed to the front end of the primary reamer bit 2. Preferably, in order to better realize the guiding function, the length of the front guide 1 is 2 times the diameter of the pilot directional hole. 3 times, its diameter is 2-5mm smaller than the diameter of the pilot directional hole, so that the pre-guider 1 can be used to guide the overall reaming tool to drill forward along the directional pilot hole during reaming. In.

[0039...

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Abstract

A dual-power large-diameter step-type reaming drill tool and method for directional holes in underground rock formations in coal mines. The drill tool assembly of the present invention is sequentially connected by a front guide, a primary reaming drill bit, a secondary reaming drill bit, and a dual-power reaming tool. composition. Use the front guide to guide the reaming drilling tool to ream the pilot hole along the rock formation; the dual-power reaming tool drives the primary reaming bit to rotate and break the rock under the driving force of the high-pressure water of the mud pump, and realizes the primary increase in the diameter of the drilling hole. Expansion, under the action of the rotary drive power of the hole drilling rig, drives the secondary reaming bit to rotate and break the rock, realizing the secondary stepwise expansion of the drilling diameter. This method makes full use of the mechanical power of the drilling rig and the driving force of the mud pump to realize the single-time double-stage large-diameter augmentation of directional drilling, which can effectively save the drilling times of reaming drilling, and improve the construction efficiency of reaming drilling and the diameter of rock formation drilling. , Reduce the labor intensity of reaming operations.

Description

Technical field [0001] The invention relates to the technical field of underground tunnel drilling in coal mines, in particular to a dual-power large-diameter stepped reaming tool and method for directional holes in underground rock formations of coal mines. Background technique [0002] When working face mining, coal seam gas gushes out in large quantities and accumulates in the roof fissure zone and upper corner, causing gas concentration in the return air tunnel and upper corner to easily exceed the standard, which seriously affects the safety of working face mining. [0003] Roof high-location directional drilling is an important technical measure for pressure relief gas drainage in the mining-affected area of ​​the working face. The diameter of the borehole is an important factor affecting the gas drainage effect of roof high-location directional drilling. Practice has proved that under the same coal seam occurrence conditions, the same drilling depth and the same negative pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/26E21B7/04
CPCE21B7/04E21B10/26
Inventor 李泉新石智军赵建国方俊刘建林许超王四一
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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