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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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A coupling sleeve, also known as a hydraulic adapter or coupling, serves as the connecting bridge between hydraulic hoses, pipes, or fittings. It is designed to facilitate secure, leak-proof connections, ensuring the smooth flow of hydraulic fluid within the system. The percentage symbol in coupling sleeve in web-based contexts is simply a URL encoding for the space character, but it underscores the importance of clear communication in technical specifications.

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