What are the advantages and/or disadvantages of the top head and table drive
system? - ANSWER Top head drive:
Advantages: Direct torque, better control, less drill string wear.
Disadvantages: More expensive, more complicated maintenance.
Table Drive:
Advantages: Less expensive, simpler.
Disadvantages: Less control, greater drill string wear.
Why must the bit be kept in gauge? - ANSWER Keeps hole diameter correct,
prevents well collapse, and ensures drilling efficiency.
How is sharpening accomplished for the DHH drill bit? - ANSWER By
grinding the edges of the rounded or blunt cutting surfaces of the bit, usually
with special grinding tools.
How would a crooked hole be repaired by air rotary? - ANSWER through the
use of stabilizers, weight removal on the bit, and adjustment of the drilling
angle.
Explain various methods of setting casing with air rotary rigs. - ANSWER
Driving: Hammer or rig drive casing down.
Rotating: Spin casing into place on the drill rig.
Pushing: Force casing down with rig's hydraulic system.
What could cause lost circulation in air rotary drilling? - ANSWER Fractured
rocks, porous zones, or pressured-up air forcing fluid into nearby formations.
How are air rotary rigs sized? - ANSWER Air compressor capacity (CFM/PSI)
drilling depth capacity
system? - ANSWER Top head drive:
Advantages: Direct torque, better control, less drill string wear.
Disadvantages: More expensive, more complicated maintenance.
Table Drive:
Advantages: Less expensive, simpler.
Disadvantages: Less control, greater drill string wear.
Why must the bit be kept in gauge? - ANSWER Keeps hole diameter correct,
prevents well collapse, and ensures drilling efficiency.
How is sharpening accomplished for the DHH drill bit? - ANSWER By
grinding the edges of the rounded or blunt cutting surfaces of the bit, usually
with special grinding tools.
How would a crooked hole be repaired by air rotary? - ANSWER through the
use of stabilizers, weight removal on the bit, and adjustment of the drilling
angle.
Explain various methods of setting casing with air rotary rigs. - ANSWER
Driving: Hammer or rig drive casing down.
Rotating: Spin casing into place on the drill rig.
Pushing: Force casing down with rig's hydraulic system.
What could cause lost circulation in air rotary drilling? - ANSWER Fractured
rocks, porous zones, or pressured-up air forcing fluid into nearby formations.
How are air rotary rigs sized? - ANSWER Air compressor capacity (CFM/PSI)
drilling depth capacity
