دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: The amount of pressure (or force per unit area) exerted on a formation exposed in a wellbore below the internal fluid pressure of that formation. If sufficient porosity and permeability exist, formation fluids enter the wellbore. The drilling rate typical

when the pressure exerted by the column of fluid in the wellbore is less than the pore pressure in the formation.

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.

adj: of or relating to a condition in which pressure in the wellbore is less than the pressure in the fonnation.