SPE E&P Glossary
U-Tube
UB
UBD
UBI
UBO
UCS
ULCC
Ultimate Strength
Ultrahigh-Pressure Water Jetting
Ultrasonic
Ultraviolet Disinfectation
Umbilical
UMV
Unassociated gas
Uncertainty
Uncertainty (Risk)
Uncertainty Assessment (Risk)
Unconformity
Unconsolidated formation
Unconventional Resources
Under Reamer
Underbalance
Underbalance Drilling
Underbalance Drilling Level 0
Underbalance Drilling Level 1
Underbalance Drilling Level 2
Underbalance Drilling Level 3
Underbalance Drilling Level 4
Underbalance Drilling Level 5
Underbalanced Perforating
Undergauge hole
Underground Blowout
Underlift
Under-Ream
Under Travel
Undersaturated Oil
Undeveloped Reserves
Undeveloped Acreage
Undiscovered Petroleum Initially in Place
Undisturbed Zone
Undulating
Unit Operator
Unitize
Unloading
Unloading Valve
Unproved Reserves
Unsteady State
Unweighted Fluid
U<sub>o</sub>
Up Dip
Updip Well
Up Steam
Uplift
Upper Completion
Upper Crown Plug (subsea)
Upper Kelly Cock
Upset (chemical)
Upset (mechanical)
Upset Connection
Upstream
Uranium
UR
USGS
USI(tm)
USIT
UTM
UV
