Static Hydraulics

Static Hydraulics

Definition(s)

Static Hydraulics

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
Static Head

Static Head

Definition(s)

Static Head

Elevation of a column of liquid above a given reference point. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Static Gradient

Static Gradient

Definition(s)

Static Gradient

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
Static

Static

Definition(s)

Static

Usually refers to a pipe segment with no flow. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Squeeze Job

Squeeze Job

Definition(s)

Squeeze Job

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
Square Law

Square Law

Definition(s)

Square Law

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
Spitzglas Formula

Spitzglas Formula

Definition(s)

Spitzglas Formula

Equation used for calculating flow in small diameter, low-pressure distribution lines. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Specific Speed

Specific Speed

Definition(s)

Specific Speed

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
Specific gravity

Specific gravity

Definition(s)

Specific gravity

  1. measure which compares the density of any liquid with the density of water at the reference temperature.
  2. weight of a given volume of gas compared under standard conditions to an equal volume of dry air.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Sour Water (handling)

Sour Water (handling)

Definition(s)

Sour Water (handling)

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
Sour Fluids (handling)

Sour Fluids (handling)

Definition(s)

Sour Fluids

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
Sour

Sour

Definition(s)

Sour

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
Sonic Wave Speed

Sonic Wave Speed

Definition(s)

Sonic Wave Speed

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
Sonic Flow Meter

Sonic Flow Meter

Definition(s)

Sonic Flow Meter

Device for measuring fluid flow by timing sound waves across a cross-section of pipe. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Soft Start

Soft Start

Definition(s)

Soft Start

with VFD, logic circuit increases AC power gradually until the motor has reached full speed. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Soft Shut In

Soft Shut In

Definition(s)

Soft Shut In

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
Slug Flow

Slug Flow

Definition(s)

Slug Flow

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
Slack Pipeline

Slack Pipeline

Definition(s)

Slack Pipeline

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
Shutdown Valves, Emergency

Shutdown Valves, Emergency

Definition(s)

Shutdown Valves, Emergency

Used to shut down flow line from rotating head in emergency situations, preferably butterfly or similar quick - closing design See ESD. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Sight Windows

Sight Windows

Definition(s)

Sight Windows

Sight windows are an effective and economical way of viewing tank, pressure vessel and piping systems interiors. Also referred to as a sight glass. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Shipping Pumps

Shipping Pumps

Definition(s)

Shipping Pumps

Typically centrifugal in design, used to transport drilling fluids to the suction tank and produced fluids to the storage facility. Mostly activated manually, but some float activated pumps are in use. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Set Point

Set Point

Definition(s)

Set Point

Preset value that is the desired value of a variable, such as suction or discharge pressure. Source: IADC UBO / MPD Glossary, December 2011. Global Standards