3.12 Formation Competency Test. A formation competency test is made to determine if a wellbore will support drilling fluid of a higher density which may be required at some future time during the well drilling and completion operations. The formation competency test is performed by pumping drilling fluid into the wellbore at a slow rate (typically one-half barrel per minute) with blowout preventers closed. Pumping into the wellbore should be continued until reaching the predetermined test pressure as calculated below:
Test pressure (psi) =
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