Coal mine underground core barrel straightness-keeping drilling equipment and drilling method

Abstract

The invention relates to coal mine underground core barrel straightness-keeping drilling equipment and a drilling method, the coal mine underground core barrel straightness-keeping drilling equipment comprises a drill rod, a screw drill, a deslagging joint, a core barrel and a core drill bit which are sequentially connected into a whole through threads, and a rotor joint part of the screw drill is connected with a full-end-face drill bit and is arranged in the deslagging joint; the screw drilling tool drives a rotor of the screw drilling tool to drive the full-end-face drill bit to rotate and cut under the action of high-pressure cutting fluid, a plurality of deslagging channels are formed in the deslagging connector close to one end of the core barrel in the circumferential direction, and an annular cavity facilitating deslagging is formed between the outer surface of the screw drilling tool and the coal rock hole wall. The drilling machine transmits the torque and feeding load of the drilling machine to the core drill bit, the core drill bit is driven to drill a coal and rock pillar, the coal and rock pillar enters the core barrel, the full-end-face drill bit is driven to rotationally cut the coal and rock pillar in the core barrel under driving of a rotor of the screw drilling tool, and waste residues obtained after crushing are discharged into the annular cavity through a residue discharging channel of the residue discharging connector. And under the action of rotation of the full-end-face drill bit and cutting fluid, the cutting fluid is discharged out of the hole.

Description

technical field [0001] The invention belongs to the field of coal mine machinery, and relates to a straight-keeping drilling device and a drilling method for an underground core pipe of a coal mine, in particular to a straight-preserving and anti-inclined drilling device and a drilling method for the underground core pipe of a coal mine. Background technique [0002] The drilling construction of underground gas drainage in coal mines is the basic technical guarantee for realizing gas drainage, and the quality of drilling construction plays a key role in the effect of gas drainage. The straight-line and deviation-preventing technology of the drainage hole is one of the key technologies for coal seam gas drainage. In the process of drilling construction, the drilling trajectory is greatly affected by the azimuth angle, inclination angle, changes in hardness and inclination of coal (rock) layers, as well as technological parameters such as feed force, rotational speed and pump ...

AI Technical Summary

Problems solved by technology

[0004] In view of this, in order to solve the problems that the existing straight-keeping drilling rigs cannot effectively solve the problem of drilling deviation, low precision, poor applicability, and affecting the gas drainage effect, the present invention provides an underground core pipe straight-keeping drilling equipment for coal mines and drilling method, the drilling equipment can reduce the trajectory deviation, reduce the gas drainage blind area, and improve the gas drainage effect

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