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boue à base d'eau,boue à base d'huile,air,mousse,plymères
Drilling bits become hot enough to break and loose penetration quality. Fluids are used to maintain temperature of bits and for safety reasons.
Not open question,and it depends on temp ,pressure and on or offshore ...
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Water for one, then it depends what you are drilling into and at what depth. Talk about an open question...
