Skip Navigation MMS Home Minerals Management Service MMS Home pagesSearchMMS Topic IndexAbout MMSWhat’s New United States Department of the Interior
Glossary Offshore Minerals Management

Offshore Minerals Management Home Page
spacer
Glossary
AA - ABPA - PM Glossary
AC - AS GlossaryPO - PV Glossary
BA - BL GlossaryQ Glossary
BO - BY GlossaryRA - RH Glossary
C GlossaryRI - RU Glossary
D GlossarySA - SH Glossary
E GlossarySI - SP Glossary
F GlossarySQ_SY Glossary
G GlossaryTA - TH Glossary
H GlossaryTH - TW Glossary
I GlossaryU Glossary
J GlossaryV Glossary
K GlossaryWA - WE Glossary
L GlossaryWH - WO Glossary
MA - MH GlossaryX Glossary
MI_MU GlossaryY Glossary
N GlossaryZ Glossary
O Glossary
spacer
Privacy Act/Disclaimers

Content/Pagemasters:
   OMM Web Team

spacer
 

 

   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