دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

underbalance drilling.

drilling with a pressure in the wellbore that is lower than the pressure in the formation.

IADC-UBO term. Performance enhancement only;no zones containing hydrocarbons.

IADC-UBO term. Well incapable of flow to surface.

IADC-UBO term. Well capable of natural flow to surface, but conventional well kill methods are enabled, and limited consequences are possible in case of catastrophic equipment failure.

IADC-UBO term. Geothermal and non-hydrocarbon production. Maximum shut-in pressures are less than UBD equipments operating pressure rating. Catastrophic failure has immediate, serious consequences.

IADC-UBO term. Hydrocarbon production. Maximum shut-in pressures are less than UBD equipments operating pressure rating. Catastrophic failure has immediate, serious consequences.

IADC-UBO term. Maximum projected surface pressures exceed UBO equipments operating pressure rating, but are below BOP stack rating. Catastrophic failure has immediate, serious consequences.