Motor Actuators Electric/Electronic

Motor Actuators Electric/Electronic

Definition(s)

Motor  Actuators  Electric/Electronic

Valve

actuators using a motor to drive a combination of gears that generates the desired torque or thrust level. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Valve Actuators

Valve Actuators

Definition(s)

Valve Actuators

General - devices that, in response to a signal, automatically move the valve to the desired position using an outside power source. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Upsurge

Upsurge

Definition(s)

Upsurge

Positive pressure surge. Upsurge pressure is above the normal operating pressuren. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Underbalanced Operation (UBO)

Underbalanced Operation (UBO)

Definition(s)

Underbalanced Operation (UBO)

A well construction or maintenance activity employing appropriate equipment and controls where the pressure exerted in the wellbore is intentionally less than the pore pressure in any part of the exposed formations with the intention of bringing formation fluids to the surface. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Ultimate Potential

Ultimate Potential

Definition(s)

Ultimate Potential

An estimate of recoverable reserves produced by the time all exploration and development activity is completed. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
UBD Zone

UBD Zone

Definition(s)

UBD  Zone

Section of well, in the context of Underbalanced Operations, where performing UBD. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Turbulent Flow

Turbulent Flow

Definition(s)

Turbulent Flow

Occurs when fluid particles in the line or vessel flow in random directions and forward at the same velocity. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Turbine Meter

Turbine Meter

Definition(s)

Turbine Meter

A meter using a multi-bladed rotor to which the fluid imparts a rotational velocity that is proportional to the mean velocity of the stream; counting rotor revolutions derives volume. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Tuning

Tuning

Definition(s)

Tuning

Tweaking physical system characteristics until predicted flow and pressure values match actual data. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Transition Region

Transition Region

Definition(s)

Transition Region

Flow regime where the fluid flow is turbulent but not fully developed turbulence. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Transition Flow

Transition Flow

Definition(s)

Transition Flow

Multiphase-fluid flow regime characterized by a chaotic mixture of liquid and gas, with neither phase appearing to be continuous. Also known as churn flow, transition flow is an intermediate flow condition between slug flow and mist flow. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Transit Time

Transit Time

Definition(s)

Transit Time

Time it takes the carrier to transport a batch from the supply point to the delivery point. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Transient Model

Transient Model

Definition(s)

Tension Tool

On- or off-line simulation that considers dynamic fluid flow characteristics over a specified time span. Also called unsteady state model. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Transient Analysis

Transient Analysis

Definition(s)

Transient Analysis

Method of flow analysis of a line or vessel system that takes into consideration changing flowing or pressure conditions over time usually using a computer program. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Transient Flow

Transient Flow

Definition(s)

Transient Flow

Unsteady (changing) flow or pressure condition that changes with time. A transient can also refer to a transition between two steady state conditions. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Transient

Transient

Definition(s)

Transient

Unsteady (changing) flow or pressure condition that changes with time. A transient can also refer to a transition between two steady state conditions. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Traceability

Traceability

Definition(s)

Traceability

Ability to document the history of an object.
  • NOTE: Traceability can relate to both the origin of materials and finished parts as well as associated processing history.
Source: API STANDARD 18LCM, Product Life Cycle Management System Requirements for the Petroleum and Natural Gas Industries, First Edition, April 2017. Global Standards

Traceability

The ability for parts to traced to their origin. The origin refers to material and place of manufacture. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Total Head

Total Head

Definition(s)

Total Head

The sum of static head, elevation head and dynamic head. Total head is the total useful energy the liquid has at any point. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Total Energy Head Line

Total Energy Head Line

Definition(s)

Total Energy Head Line

Horizontal line on the total energy diagram that indicates the amount of total head that is in the liquid at the start of a line or vessel segment. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Total Energy Diagram

Total Energy Diagram

Definition(s)

Total Energy Diagram

Graphical representation that shows the elevation profile of a line or vessel, with the total head for each batch drawn as a horizontal line above the elevation profile. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Torque

Torque

Definition(s)

Torque

The product of applied force and moment arm required to prevent rotation of a rope when tension is applied. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards

Torque

Force that produces rotation of an object around a point. Also called a couple. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Time Step

Time Step

Definition(s)

Time Step

Each calculation out in time for a transient model. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Tight System

Tight System

Definition(s)

Tight System

Minimized phase separation at a location with an extreme change in elevation by maintaining sufficient pressure upstream and down-stream of the drop in elevation. Source: IADC UBO / MPD Glossary, December 2011. Global Standards