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![AA - AB](_borders/AA_AB.gif) ![PA - PM Glossary](_borders/pa-pm.gif)
![AC - AS Glossary](_borders/AC_AS.gif) ![PO - PV Glossary](_borders/PO_PV.gif)
![BA - BL Glossary](_borders/BA_BL.gif) ![Q Glossary](_borders/Q_.gif)
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![F Glossary](_borders/F_.gif) ![SQ_SY Glossary](_borders/SQ_SY.gif)
![G Glossary](_borders/G_.gif) ![TA - TH Glossary](_borders/TA_TH.gif)
![H Glossary](_borders/H_.gif) ![TH - TW Glossary](_borders/TH_TW.gif)
![I Glossary](_borders/I_.gif) ![U Glossary](_borders/U_.gif)
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![K Glossary](_borders/K_.gif) ![WA - WE Glossary](_borders/WA_WE.gif)
![L Glossary](_borders/L_.gif) ![WH - WO Glossary](_borders/WH_WO.gif)
![MA - MH Glossary](_borders/ma-mh.gif) ![X Glossary](_borders/X_.gif)
![MI_MU Glossary](_borders/MI_MU.gif) ![Y Glossary](_borders/Y_.gif)
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OMM Web Team
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U
ultraviolet light |
light waves shorter than the visible blue
violet waves of the spectrum. Crude oil, colored distillates, residuum, a few
drilling fluid additives, and certain minerals and chemicals fluoresce in the presence of
ultraviolet light. These substances, when present in mud, may cause the mud to
fluoresce. |
underbalanced |
of or relating to a condition in which
pressure in the wellbore is less than the pressure in the formation. |
underground
blowout |
an uncontrolled flow of gas, salt water, or
other fluid out of the wellbore and into another formation that the wellbore has
penetrated. |
unitization |
a system of operating a certain oil and
condensate reservoir in order to conduct some form of pressure maintenance, repressuring,
waterflood, or other cooperative form to increase ultimate recovery. |
underream |
to enlarge the wellbore below the casing. |
unit operator |
the oil company in charge of development and
production in an oilfield in which several companies have joined to produce the field. |
univalent |
monovalent. See valence,
unloader. Same as a circulation valve |
unloading a well |
removing fluid from the tubing in a well,
often by means of a swab, to lower the bottomhole pressure in the wellbore at the
perforations and induce the well to flow. |
unloading sub |
an unloader; provides a means to equalize
tubing and annulus pressure. |
upper kelly cock |
a valve installed above the kelly that can be
closed manually to protect the rotary hose from high pressure that may exist in the drill
stem |
urea |
a soluble, weakly basic, nitrogenous compound
used in the manufacture of resins and plastics. |
Privacy |
Disclaimers |
Accessibility
AA-AB |
AC-AS | BA-BL |
BO-BY | C |
D | E |
F | G |
H | I |
J | K |
L | MA-MY |
MI-MU | N |
O | PA-PM |
PO-PV |
Q | RA-RH |
RI-RU | SA-SH |
SI-SP | SQ-SY |
TA-TH | TH-TW |
U | V |
WA_WE | WH-WO |
X
| Y | Z
Offshore Home |
Glossary
Last Updated:
02/01/2006,
12:31 PM
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