Page 143 - Drilling Technology in Nontechnical Language

134 Drilling Technology in Nontechnical Language Second Edition

Fig. 5–19. Driller at the rig oor controls
Photo courtesy of Schlumberger.

Fig. 5–20. Section through the rotary table

The rotary table assembly is comprised of a steel housing with an
electric motor, gearbox, and power train underneath. This motor and
transmission system is connected to a hollow steel cylinder (the rotary
table), which can then rotate. Bearings underneath support the load of the
rotary table and anything supported inside it.

The rotary table has another cylinder, called the master bushing,
placed inside it, and this in turn can accommodate different sizes of sleeves
that adjust the size of the hole in the center. These sleeves, called insert

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