Drilling device for hydraulic fracturing weakening hard roof

A hydraulic fracturing and hard top technology, applied in the direction of drilling equipment, drilling equipment and methods, drill bits, etc., can solve the problems of drill bit damage, low drilling efficiency, and affecting construction efficiency, so as to improve service life and drilling efficiency The effect of high and efficient drilling

CN109113570AActive Publication Date: 2019-01-01ANHUI UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-01-01

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Abstract

The invention discloses a drilling device for a hydraulic fracturing weakening hard roof. According to the drilling device for the hydraulic fracturing weakening hard roof, when drilling the hard roof, drilling of the hard roof can be conveniently realized, and the drilling efficiency is high; drilling is carried out through an inner drill rod, reaming is carried out through an outer drill rod, drilling of the hard roof can be efficient, and consumption of a drill bit is relatively little; and the hard roof can be drilled quickly by adopting a drilling mode of swinging and rotating of the inner drill rod, axial force of a drill hole can be greatly reduced, and subsequent implementation of the hydraulic fracturing weakening hard roof is facilitated. According to the drilling device for thehydraulic fracturing weakening hard roof, the structure is simple, transmission is reasonable, the drilling efficiency of the hard roof is greatly ensured, and meanwhile the service life of the drillbit is prolonged.
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Description

technical field

[0001] The invention relates to a hydraulic fracturing weakened hard roof drilling device, and belongs to the technical field of hydraulic fracturing weakened roof auxiliary equipment. Background technique

[0002] The problem of hard roof has always been a major factor that plagues the safety production of coal mines. Due to the high strength of the hard roof and the lack of cracks, it is easy to form a large area of ​​suspended roof after mining, and a large amount of gas is easy to accumulate in the suspended roof area. When a large area of ​​overhanging roof suddenly collapses, the impact storm is accompanied by a large amount of gas gushing out, which will not only cause serious damage to support equipment and roadways, but may also cause a series of accidents such as gas outbursts and explosions, causing injury to personnel and bringing helplessness. estimated loss.

[0003] In this regard, for the hard roof, it needs to be drilled and then weakened b...

Examples

Embodiment Construction

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0021] see Figure 1-3 , the present invention provides a technical solution: a hydraulic fracturing weakened hard roof drilling device, which includes an outer drill string 1, an inner drill string 2, a front drill bit, a reaming drill edge, a connecting seat 12 and a swing driving mechanism, wherein the The inner drill string 2 is sleeved in the hollow cavity in the outer drill string 1, and a cavity 9 is arranged between the outer wall of the inner drill st...