In addition to the appliances mentioned the tools comprise reamers to enlarge the bore of the well, the winged-substitute which is fitted above the bit to prevent it from glancing off, and above the round reamer to keep it in place, a temper-screw with clamps and wrenches.
The majority were reamed using tapered reamers in a pillar drill.
HIGH ROTARY TORQUE turns very large reamers in long bores (48,000 lb ft, 65,000 Nm ).
HIGH ROTARY TORQUE spins very large reamers in long bores (15,000 ft-lb ).
These systems have integral mixing, cleaning and pumping capability, and enough capacity for mud motor work and use of large reamers.