Underbalanceddrilling(UBD)operationsinvolvemaintainingthepressureinthewellborelowerthantheformationpressureduringdrilling.TheAPIRP92U(1stEdition,November2008)providesguidelinesandbestpracticesforsafelyandeffectivelyconductingunderbalanceddrillingoperations.Thisdocumentcoverskeyaspectssuchaswelldesign,equipmentselection,operationalprocedures,andriskmanagementtominimizehazardsandoptimizedrillingperformance.Itservesasacriticalreferenceforengineersandoperatorsworkinginunderbalanceddrillingenvironments,ensuringcompliancewithindustrystandardsandenhancingoperationalsafetyandefficiency.
