Smooth drilling, but rapid penetration, indicates finesand. Additionally, the log includes information of thetime it took to drill each foot. As drilling speed is largelydetermined by the composition of the formations,information from the well log may be used in graph formto reveal the top, bottom, and thickness of eachformation. Clues to the composition of each formationare provided by this log and verified by the samplesobtained.Rotary Drilling CrewThe water well rig is normally operated by a toolpusher, a driller, a derrick hand, and a floor hand. Forexpediency, water well drilling as performed in the NCFis a continuous operation; therefore, you are required tohave more than one shift. The hours of each shiftdepends upon the crew size available, the experiencelevel of the members of the crew, and the condition ofthe equipment; for example, two 12 hour shifts or three8 hour shifts.The tool pusher is responsible for outlining theoverall drilling program and seeing that it is carried out.The driller carries out the drilling orders, operates therig, and must know the depth, viscosity, density, sandcontent, type of cuttings, number of steel, and the psi ofthe mud pump. The derrick hand works in the mast andFigure 9-6.-Kelly-drive rotary method of drilling.9-6
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