Special Drill String Equipment | Oil well drilling rig lessons | epd 1_5 

I work as a motor hand on a drilling rig in Alberta, Canada. I've used yours videos to help me out and put me ahead of the curve at work, Thank you sir!

Very good

Well done

nice bro I like this

buena explicacion y exelente contenido

how can we calculate neutral point on drill string

buen video,, genial

Nice