Pilot-scale Study on Titanium Alloy Drilling Rod in Coal Mine

Abstract:

At present, beryllium copper non-magnetic drilling rod material is used for horizontal directional drilling in coal mine tunnel both in China and abroad. Because of the low elongation of this alloy material, the drilling rod is easy to be broken. In order to solve this problem, high strength titanium alloy drill rod is developed; the material selection and the drill pipe thread structure design were discussed. The tests on upsetting process show that the strength is up to the design goal and the field tests verify the application effect of the drilling rod.

Key words:coal mine; directional drilling; upsetting technology; titanium alloy; non-magnetic drilling rod; field test