a device fitted with a vertical series of
explosive charges that is lowered down a
well on a wire line to perforate the formation,
also known as a perforating gun
Surge
a sudden change in flow, liquid level,
temperature or pressure, etc in a
pipeline or vessel
Slick
see oil slick
Roughneck
one of the assistants to a driller, a laborer
who works on the actual derrick floor of
an offshore rig or platform
Floorman
a member of the drilling crew whose work
station is on the derrick floor
Tropospheric scatter radio network
a communications technique involving
the scatter of shortwave radio waves from
the lower part of the atmosphere
Sparger
a sprinking device, usually applied to
devices for distributing gases or air
in liquids
Wildcat appraisal well
an appraisal well drilled with minimum
preliminary information about the underlying
structure and conditions, it usually
follows a wildcat well which reported
shows of oil or gas
Wildcat
an exploration well drilled without knowledge
of the contents of the underlying
rock structure
Exploration drilling
drilling carried out to determine whether
hydrocarbons are present in a particular
area or structure
Manifold
piping arrangement which allows one
stream of liquid or gas to be divided into
two or more streams
Breakout
the process whereby one section of drill
pipe is unscrewed from another, sometimes
also used to refer to promotions
within the drilling team
Dilute
to reduce the strength of concentration of
a solution by the addition of another liquid
Spillage
an accidental release of oil, or
another liquid
Decomposition
the breaking up of a chemical compound
to form two or more simpler molecules
Roustabout
a general laborer in an oil drilling and/or
production operation
Deterioration
any undesirable chemical or
physical change
Atomization
conversion of a liquid into a mist, or spray
Mud
see drilling mud
Soluble
capable of being dissolved, usually in
water, unless another solvent is specified
Cash flow profile
a chart showing expenditure on a project
and income from the project over a period
of time
Reaction
any process involving chemical change
by which new chemical products
are formed
Solution gas drive
a primary recovery process in which oil is
driven out of a reservoir by the natural
pressure exerted by the dissolved gas
Standby boat
a boa≫ (often a converted fishing boat)
which maintains permanent station near
an offshore structure in order to provide
support facilities in an emergency
Pit
an unroofed sump or tank for holding liquids
such as drilling mud
Mud pit
large steel storage pits through which the
drilling mud is circulated
Dogleg
an abrupt change in the direction of a
well bore
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