Low helical abrasion-proof drill rod for mash gas pumping drilling construction and machining process thereof

Abstract

The invention discloses a low spiral wear resistant drill rod applied to drilling construction in gas extraction and a processing technique thereof. The drill rod is a mill finish round drill rod, the center of the drill bar is provided with an inner bore, the two ends are provided with connecting threads and the outer surface of the mill finish drill rod is provided with a spiral alloy coating. The processing technique of the drill rod has the following steps: first, a normal round drill rod is made according to normal methods; second, the surface of the round drill rod is coated with spiral alloy convex reinforcements; third, heating treatment is carried out to relieve stress and the drill rod is aligned. On one hand, the low spiral wear resistant drill rod applied to drilling construction in gas extraction improves the wear resistant performance of the drill rod and prolongs the service life of the drill rod; on the other hand, the center of the drill rod is provided with the inner bore, which endows the drill rod with the function of liquid slag discharge, and the outer surface of the mill finish drill rod is provided with the spiral alloy coating, which endows the drill rod with the function of mechanical slag discharge. The drill rod is applicable to the drilling construction on weak coal seams, outburst coal seams and rocks in gas extraction.

Description

technical field [0001] The invention relates to a drill pipe and a processing technology thereof used in the drilling construction of underground gas drainage in coal mines. Background technique [0002] Underground gas drainage drilling is divided into coal seam drilling and rock drilling. There are two types of drill pipes commonly used, one is the auger drill pipe (mechanical slag discharge drill pipe) that relies on the rotary power of the drilling rig to discharge slag, and the other is the drill pipe that relies on fluid Slagging smooth round drill pipe (fluid slagging drill pipe). Smooth round drill pipes are generally used in rock drilling construction, and hydraulic slag discharge is used as a supporting tool; smooth round drill pipes and auger drill pipes can also be used in coal seam drilling construction. The above-mentioned two kinds of drill pipes all have defects during the above-mentioned two kinds of drilling constructions, which are mainly manifested in: t...

AI Technical Summary

Problems solved by technology

The above-mentioned two kinds of drill pipes all have defects during the above-mentioned two kinds of drilling constructions, which are mainly manifested in: the smooth round drill pipe has serious friction with the rock hole during the construction of rock drilling, and the life of the drill pipe is very short; Coal seam drilling cannot adapt to hole collapse and blockage, and the drilling fluid slag discharge system is often blocked; the construction efficiency of the auger drill pipe in the coal seam drilling is low, and the phenomenon of suction and sticking of the drill often occurs

[0003] The published invention "Extrusive Coal Seam Grilled Hole Cooling Drilling Tool and Its Drilling Method" (Patent Publication No. CN101131069A) adopts two methods of engraving spiral grooves on smooth round drill rods or welding flat steel plates. It has a certain effect, but the groove method has the disadvantages of severe drill pipe wear and short drill pipe life in rock hole construction, and the welding flat steel plate method has complicated processing technology and high cost of drill pipe

Images