ROTARY DRILLING

May 14th, 2015
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In the rotary method, the hole is drilled by a rotating bit to which a downward force is applied. The bit is fastened to, and rotated by, a drill string, composed of high quality drill pipe and drill collars, with new sections or joints being added as drilling progresses.

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4 Rotary DrillingROTARY DRILLINGIn the rotary method, the hole is drilled by a rotating bit to which a downward force is applied. The bit is fastened to, and rotated by, a drill string, composed of high quality drill pipe and drill collars, with new sections or joints being added as drilling progresses.The cuttings are lifted from the hole by the drilling fluid which continuously circulated down the inside of the drill string through water courses or nozzles in the bit, and upward in annular space between the drill pipe and bore hole.At the surface, the returning fluid (mud) is diverted through shale shakers, desilters, desanders and series of tanks or pits which treat the fluid. In the last of these pits the mud is picked up by the pump suction and repeats the cycle. Figure 1 shows the basic components of a rotary drilling rig.Making a connection, the process of adding a new joint of pipe to the drill string is shown in Figure 2. Periodically the pipe must be removed from the hole in order to replace the bit. The operation is illustrated in Figure 3. The basic drilling components are:1.Derrick, mast and substructures2.Drawworks3.Mud pumps4.Prime movers5.The dril

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