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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. |
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Last Updated:
02/01/2006,
12:31 PM
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