DTH technique was used in well drilling exclusively to dig, accurate, vertical bores, and rotary drilling was used to turn the hole. The Directional DTH system, patented by Atlas Copco, was first used successf. [pdf]
[FAQS about Down-the-hole drill code]
These are companies that own the drilling rigs. This might be a single company that owns the rig, or a small group of companies that are pooling resources. The drilling contractor drills the well, supplying the rig. [pdf]
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