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4 Part I Liquid Drilling Systems

Rotary Hose
Standpipe
Swivel
Kelly Mud Pump

Mud Line

Mud Tanks
Drill Pipe
Shale Shaker
Drill Collar
(BHA)

Drill Bit
Figure 1.1 A typical mud circulating system.

Figure 1.2 A duplex pump. (Courtesy of Great American.)

of operation and maintenance, reliability, and the ability to operate over a
wide range of pressures and flow rates by changing the diameters of the
compression cylinders (pump liners) and pistons.
The two types of piston strokes are the single-action piston stroke and
the double-action piston stroke. A pump that has double-action strokes in
two cylinders is called a duplex pump (Figure 1.2). A pump that has single-
action strokes in three cylinders is called a triplex pump (Figure 1.3). Triplex
pumps are lighter and more compact than duplex pumps, their output