Sum of the elevation head and static head that must overcome before any liquid begins to flow.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Refers to the properties of liquids when liquids are at rest and examines how pressure and changes in elevation affect fluid behavior in the line or vessel.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Representation of the height of liquid column or static head above the elevation at any point on the line or vessel.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Remedial operation to pump cement slurry down a well into open perforations, formation cavities etc, to create a blockage.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Relationship between velocity and the pressure drop in the pipe, where for over a limited range of flows, pressure drop is proportional to the square of the velocity for flow rate (also called capacity).
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Equation used for calculating flow in small diameter, low-pressure distribution lines.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Design index that gives a general indication of the overall performance and geometry of the pump and impeller.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Water contaminated with hydrogen sulfide (H2S). Run through a degasser (poor boy, vane type etc) and pass to a tank before disposal..
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
In underbalance drilling operations, where sour fluids are expected a closed system is utilized to meet recognized industry standards for handling such fluids.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Hydrocarbon fluids containing sulfur. Generally taken as greater than or equal to 10-ppm, the 8 hour occupational exposure limit.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Speed at which a transient wave travels through a line or vessel. It depends on fluid properties, and the elastic modulus of the pipe.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
with VFD, logic circuit increases AC power gradually until the motor has reached full speed.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
To shut in a well by closing the blowout preventer with the choke and choke line valve open, then closing the choke while monitoring the casing pressure gage for maximum allowable casing pressure.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
A multiphase fluid-flow regime where the gas and liquid phase are discrete over portions of the flow. Generally occurs in combination with bubble flow. Flow will vary from high liquid to high gas cuts. Also called Line Jacking.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Maintaining column separation at a location with an extreme drop in elevation so that the pressure does not exceed the maximum operating pressure (MOP).
Source: IADC UBO / MPD Glossary, December 2011. Global Standards