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6 FAQs about [Down-the-hole drilling rig chain oil seal replacement video]
What is down-the-hole (DTH) drilling?
Down-the-hole (DTH) drilling has made it easier for contractors to drill wells faster and more efficiently, and to transition from dirt boring to rock boring just by adding a compressor and hammer to the drill bit.
How does a DTH drill work?
DTH equipment consists of a drilling hammer and a piston-powered by compressed air. As the drill string rotates, the drilling hammer strikes down on the rock. The drill bit receives its striking power from a piston inside the hammer that is powered by compressed air.
Can a driller overrun a rig?
Each breakdown or failure of a system (guard) on the drawworks could be a safety hazard. The driller should know or learn as quickly as possible the limitations or capacity of his men. A driller can operate the rig only as fast as the slowest member of his crew. Overrunning a crew can result in a serious accident.
What should be done if a rig can't shut down?
Cathead foul guards should be properly positioned. Lockout/Tagout should be used. On mechanical rigs, if the engines cannot be shut down, the air line to the engine clutches should be removed. On electric rigs, the control switch in the SCR house should be turned off and locked out. The auxiliary braking systems must function properly.
What should a driller know if a rig is safe?
The driller should know or learn as quickly as possible the limitations or capacity of his men. A driller can operate the rig only as fast as the slowest member of his crew. Overrunning a crew can result in a serious accident. A smooth running, well-maintained drawworks counts for a lot in a safe operation.
How long did it take to drill a 12,000 ft hole?
The original estimate for completion of a 12,000-foot hole was 30 days using the conventional rotary technique, which was reduced to 13 days using the DTH method. Before DTH was used, drillers would typically case the vertical portion of the well and convert to rotary drilling to drill at a tangent.