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a measure of the resistance of a fuel to
pre-ignition ("knock") when burned in an
internal combustion engine
Olefin
see alkenes
Operator
an individual, partnership or corporation
that has legal authority to drill wells and
undertake production if hydrocarbons are
found, the operator may either drill the
wells himself or employ a drilling contractor
for this purpose The operator is often
part of a consortium and acts on behalf
of this consortium
Jacket leg
the steel lattice structure used to support
an offshore steel platform
Steel jacket
the steel lattice structure used to support
an offshore steel platform
Optimum
the best or most favorable
Option
the right to obtain, within a certain period
of time, other rights, е д а company that
has the right to acquire exploration rights
in a particular block is said to have an
option thereon
Orthoxylene
an aromatic compound used in the manufacture
of phthalic anhydride which, in
turn, is used mainly in producing dyes
Precipitate
an insoluble substance formed in a solution
by a chemical reaction, it sinks to the
bottom of a vessel as a sediment
Sedimentary rocks
rocks laid down by the accumulation of
sediments at the bottom of a sea, lake
river or swamp
Sedimentary basin
an area in which thick layers of sedimentary
rocks have been laid down over a
long period of time
Base
a substance that reacts with an acid to
form salt and water only
Substructure
the support frame of an offshore platform
on which the derrick, engines, quarters,
helicopter pad, cranes, etc, are installed
Jacket platform
a platform constructed entirely of steel,
such platforms are generally kept in position
by means of steel piles driven into
the sea bed
Basic petrochemical
one of the primary raw materials produced
from crude oil by steam cracking
or reforming, e g ethylene benzene
Fish
an object accidentally lost down a well
Residue
the non-volatile components of crude oil
which flow out of the bottom of a fractionating
column during fractional distillation
Residual fuel oil
very heavy fuel oils produced from the
residue from the fractional distillation
process rather than from the
distilled fractions
Bleeding
to withdraw a small portion of the contained
liquid from a line or vessel at a
slow rate
Spur line
a small-diameter underwater pipeline
connecting a production or drilling platform
to a terminal platform, on-field storage
facility, or main pipeline to the shore
Farm out
where a company relinquishes part of its
interest in an exploration or production
license to another company in return for
part-payment of its costs
Whipstock
a wedge-shaped piece of equipment
placed at the bottom of a well, thus
forcing the bit and drill pipe to deviate
from their original direction when drilling
is resumed
Sediments
loose material that is laid down at the bot
torn of a sea, lake, river or swamp
Diverter
an inflatable torus which, when pressurized,
seals off the annulus causing the
drilling mud to be diverted to the mud
pits on a drilling platform
Sump
a shallow pipe, well or tank used to hold
superfluous liquids or slurries
Cooler
equipment used to cool a stream by
giving up heat to a cool water stream, or
the atmosphere
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