Drilling fluid is basically a fluid (water or oil) circulated to bring cuttings out of the wellbore. It is commonly known as mud. Two important qualities of the fluid are needed for mud to achieve its entire task:
An optimum drilling fluid is one in which the flow rate necessary to clean the hole results in the proper hydration horsepower to clean the bit for the weight and rotary speed imposed to give the lowest cost, provided the combination of variables results in a stable bore hole that meets formation evaluation criteria and penetrates the desired target.
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