Smooth drilling, but rapid penetration, indicates fine
sand. Additionally, the log includes information of the
time it took to drill each foot. As drilling speed is largely
determined by the composition of the formations,
information from the well log may be used in graph form
to reveal the top, bottom, and thickness of each
formation. Clues to the composition of each formation
are provided by this log and verified by the samples
obtained.
Rotary Drilling Crew
The water well rig is normally operated by a tool
pusher, a driller, a derrick hand, and a floor hand. For
expediency, water well drilling as performed in the NCF
is a continuous operation; therefore, you are required to
have more than one shift. The hours of each shift
depends upon the crew size available, the experience
level of the members of the crew, and the condition of
the equipment; for example, two 12 hour shifts or three
8 hour shifts.
The tool pusher is responsible for outlining the
overall drilling program and seeing that it is carried out.
The driller carries out the drilling orders, operates the
rig, and must know the depth, viscosity, density, sand
content, type of cuttings, number of steel, and the psi of
the mud pump. The derrick hand works in the mast and
Figure 9-6.-Kelly-drive rotary method of drilling.
9-6
