Thrust auxiliary reamer bit

Abstract

The invention relates to a thrust auxiliary reamer bit which comprises a drill rod (1), a multi-blade reamer (2) which is connected to a forcing device (4) and a cylinder (5) to form a whole, and a drill bit (3), all the parts being connected in sequence. The invention is characterized in that the forcing device (4) is a fluid piston type and formed by the cylinder (5), a piston (6) and a piston rod (1) arranged in the cylinder, the piston (6) is fixed on one end of the piston rod (7), the other end projects the cylinder (5) and fixes a taper forcing head (10); an air channel is arranged in a wall of the cylinder, an upper chamber air inlet / exhaust hole (11) at one end of the air channel is through in the piston chamber, an open at the other end is communicated with a Cornish bit wing air passage namely a drill rod air channel, a lower chamber air inlet hole (13) is arranged on the wall of the cylinder and is communicated with outside through the wall of the cylinder; and a reset spring (9) is sleeved on the piston rod (7) in the cylinder. The thrust auxiliary reamer bit has the advantages of simple structure, safe and reliable performance, convenience for use, capability of enlarging the bit wing in a condition of the same small caliber, and capability of solving the problems in larger-reaming-radius construction of soft rock stratums and hard rock stratums simultaneously.

Description

(1) Technical field [0001] The invention relates to a drilling and reaming device for geological drilling of coal fields, coal bed methane, and mine gas discharge wells, in particular to a forced-push auxiliary reaming drill bit. (2) Background technology [0002] In recent years, in order to improve the comprehensive utilization of coal resources and eliminate the accidents of gas endangering production safety in the process of coal mining, before coal mining, it is generally necessary to set up pre-extraction wells for coalbed methane (gas) on the construction surface, or to set up pre-extraction wells for coalbed methane (gas) in the production mine Set up gas discharge wells to extract and collect coalbed methane. During construction, it is often necessary to make local caves or expand the diameter of the coal seam well section of the coalbed methane pre-extraction well or the specific well section of the gas discharge well to increase the production of coalbed methane o...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects in the prior art that the drill bit has a small application range and the quality of the aperture cannot be guaranteed, and to provide a new type of forced push auxiliary reaming drill bit

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