Author: Richard Stevens
If we were not circulating, this would be simply the hydrostatic head of the fluid in the wellbore. To that hydrostatic component, we add the frictional pressure due to the velocity of the fluid moving up the wellbore and any choke pressure applied at surface. If we are drilling conventionally, we will seek to maintain this BHCP a little above the formation pressure to maintain well control. If this pressure is allowed to rise too far above the formation pressure, we may end up unintentionally fracturing the formation and losing circulation.
As we are speaking in the context of coiled tubing drilling, it is more likely that we will want to maintain this pressure a little below formation pressure, to allow the formation to produce while . . .
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