The drilling process itself involves a technique known as 'circulation.' A drilling fluid, commonly referred to as 'mud,' is continuously pumped down the drill string, through the bit, and back up the annulus between the drill string and the walls of the hole. This fluid serves multiple purposes it cools and lubricates the bit, carries cuttings to the surface, stabilizes the borehole, and provides hydrostatic pressure to prevent underground fluids from entering.
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Rare-earth magnets, such as neodymium iron，are commonly used due to their high magnetic energy density Rare-earth magnets, such as neodymium iron，are commonly used due to their high magnetic energy density
Secondly, correct dimensions prevent premature wear and failure by ensuring even distribution of load across the bearing's raceways Secondly, correct dimensions prevent premature wear and failure by ensuring even distribution of load across the bearing's raceways