Technical Thesaurus oil & gas
Letter
Cable
A rope of wire, hemp, or other strong
fibres.
Cable (
coaxial)
A transmission cable consisting of two
concentric conductors insulated from each other.
Cable-tool
drilling
A drilling method in which the hole is
drilled by dropping a sharply pointed bit on the bottom of the hole. The bit is
attached to cable, and the cable is picked up and dropped, over and over, as
the hole is drilled.
Calcarenite
A name suggested by A.W. Grabau for a
"limestone or dolomite com- posed of coral or shell sand or of sand
derived from the erosion of older limestones". Size of particles range
from 1.58 to
Calcium
petroleum sulphanates
An important range of aliphatic sulphur
compounds in the form of calcium salts; used in a wide variety of industrial
and manufacturing processes, e.g. as detergents, wetting agents and
rust-inhibitors.
Calibration
Determination of the accuracy of an
instrument by finding its variation from the true measurement.
Caliper
An instrument run on wireline for
detecting and recording the internal condition of a tubing or casing string.
Caliper log
It is a continuous presentation of hole
size or area vs. depth. The logging device is fitted with flexible springs
which expand to conform with the hole as its diameter varies.
Calorific
value
A measure of the amount of energy that
is released in the form of heat when a fuel is burned.
CANOC
Canadian Organising Committee
Cap rock
An impervious layer of rock (e.g. shale
or evaporite) which overlies a. reservoir rock, thus preventing hydrocarbons
from escaping to the surface.
Capillary
action
The rise or depression of liquids in
narrow tubes; the formation of films, drops, bubbles, etc.
Capital
Money and other assets used to finance
investments designed to produce income.
Capping
To install
and close a shut-in device on top of a well flowing uncontrolled.
Carbon
A basic element; occurs in several
forms, e.g. diamonds (white, crystal- line), graphite (soft, flaky, greasy),
coke, charcoal (black, hard, solid). Carbon is the base of all hydrocarbons,
and is capable of combining with hydrogen in almost any proportion resulting in
almost numberless hydrocarbon compounds.
Carbon black
A substantially pure form of finely divided
carbon usually produced from liquid or gaseous hydrocarbons by controlled
combustion with a restricted air supply; used as a filler in the rubber
industry and to manufacture ink.
Carboniferous
period
The period of geological time which
began roughly 350 million years ago . and ended roughly 280 million years ago;
the period in which most coal seams originated in
Carried
interest
When a company pays for all or part of a
partner's costs during exploration or development, e.g. when company “carries" a State that retains a participation interest
in a field.
Carrier bar
A horizontally placed bar with a slot
which fits around the polished rod of a pumping well. It is connected to the
cable looped around the horse head of a pumping unit and positioned below a
clamp placed on the polished rod. Via these three parts the up-and-down
movement of the beam is transferred to the rod string.
Carry-over
Liquid droplets entrained in the gas
stream leaving a gas/liquid separator.
Carry-through
Free gas entrained in the liquid stream
leaving a gas/liquid separator.
Cased
Pertaining to a well bore in which
casing is run and cemented. See casing.
Cased hole
A well bore in which casing has been
run.
Cash flow
profile
A chart showing expenditure on a project
and income from the project over a period of time.
Casing
The steel pipe that is cemented into a
well to prevent the wall from caving in and stop unwanted fluids from entering
the hole from the surrounding rocks.
Casing
centraliser
A device secured around the casing at
regular intervals to centre it in the hole. Casing that is centralised allows a
more uniform cement sheath to form around the pipe.
Casing
coupling
A tubular section of pipe that is
threaded inside and used to connect two joints of casing.
Casing
elevator
See elevators.
Casing hanger
A casing hanger is a device which sits
in the bowl of a lowermost casing head or an intermediate casing head to
suspend the next smaller casing string securely and provide a seal between the
suspended casing and the casing head bowl.
Casing head
A heavy, steel, flanged fitting that
connects to the first string of casing and provides a housing for the slips and
packing assemblies by which inter- mediate strings of casing are suspended and
the annulus sealed off. Also called a spool. See annular space.
Casing head
pressure
The pressure in the annular space
between two casing strings installed in a well as measured at surface.
Casing
perforation
The holes that are made in the liner of
a finished well in order to allow oil or gas to flow into the production tube;
generally produced by a series of shaped charges fitted vertically along a
gun-perforator.
Casing seat
The lowest point in a well at which
casing is set.
Casing shoe
See guide shoe.
Casing string
The entire length of all the joints of
casing run in a well. Casing is manufactured in lengths of about
Cat walk
A raised, narrow walkway between tanks
or other installations.
Catalyst
A substance which aids or promotes a
chemical reaction, but does not; itself, enter into the reaction.
Catalytic
cracking
The process whereby heavy hydrocarbon
molecules are broken down (cracked) into lighter molecules by passing them over
a suitable catalyst (generally heated). " Catch samples' , To obtain
cuttings for geological information as formations are penetrated by the bit.
The samples are obtained from drilling fluid as it emerges from the well bore
or, in cable-tool drilling, from the bailer. Cuttings are carefully washed
until they are free of foreign matter, dried. and labelled to indicate the
depth at which they were obtained. See bailer, cable-tool drilling and
cuttings.
Catchpot
A vessel inserted in a pipeline to
remove liquid droplets or solid particles which may be entrained in a gas
stream.
Cathead
A spool-shaped attachment on a winch
around which rope for hoisting and pulling is wound. See breakout cathead and
make up cathead.
Cation
Electrified particle having positive
charge that is formed when a neutral atom or group of atoms lose one or more
electrons.
Catline
A hoisting or pulling line powered by
the cathead and used to lift heavy equipment on the rig. See cathead.
Cavernous
formations
A formation having voluminous voids,
usually the result of dissolving by formation waters which mayor may not be
still present.
Caving
Collapse of the walls of the well bore,
also called sloughing.
Cavitation
The formation of space in a flowing
liquid by a fixed object in its path. or a stationary liquid by a moving
object, e.g. behind the blades of an agitator. or in a pump which has been
incorrectly primed.
Cellar
A pit in the ground to provide
additional height between the rig floor and the wellhead to accommodate the
installation of blowout preventers, rat hole, mouse hole, and so forth. It also
collects drainage water and other fluids for subsequent disposal.
Cement
A mixture of calcium aluminates and
silicates made by combining lime and clay while heating. Slaked cement contains
about 62.5 per cent calcium hydroxide, which is the major source of trouble
when cement contaminates mud.
Cement casing
To fill the annulus between the casing
and hole with cement to support the casing and prevent fluid migration between
permeable zones.
Cement
channelling
An undesirable phenomenon that can occur
when casing is being cemented in a borehole. The cement slurry fails to rise
uniformly between the casing and borehole wall, leaving spaces void of cement.
Ideally, the cement should completely and uniformly surround the casing and
form a strong bond to the borehole wall.
Cement plug
A column of cement which is placed in a
well bore to seal off undesirable flow from or into porous formation zones.
Cement slurry
A soupy mixture of water (or other
liquid) and cement. Slurries are thin so they can be pumped and to enable the
cement to penetrate cracks and crevices and to fill all voids.
Cement
squeeze
A method whereby perforations, large
cracks. and fissures in the wall of the bore hole are forced full of cement and
sealed off. Often used to repair poor casing cementations.
Cementing
The application of a liquid slurry of
cement and water to various points inside or outside the casing. See primary
cementing, secondary cementing, and squeeze cementing.
Central
meridian
This is the longitude origin of a
Transverse Mercator Grid (also UTM).
Central
processing unit (CPU)
In computers in general the unit that
comprises the arithmetic logic unit and the control unit.
Centraliser
A device clamped onto casing to hold it
away from the well bore wall prior to cementing.
Chain
Network of navigation beacons; examples:
Syledis, Pulse 8, Hyperfix, RAGA.
Chain drive
A drive system using a chain and chain
gears to transmit power. Power transmissions use a roller chain, in which each
link is made of side bars, transverse pins, and rollers on the pins. A double
roller chain is made of two connected rows of links, a triple roller chain of
three, and so forth.
Chain tongs
A tool consisting of a handle and
releasable chain used for turning pipe or fittings of a diameter larger than
that which a pipe wrench would fit. The chain is looped and tightened around
the pipe or fitting and the handle is used to turn the tool so that the pipe or
fitting can be tightened or loosened.
Chamber lift
A special form of gas lift in which gas
is injected intermittently to lift the liquid which has filled up a
'.chamber" at the bottom of a well, to the surface.
Changing rams
On rotary drilling rigs, blowouts are
prevented by the device known as the blowout preventer. The sealing effect of
the blowout preventer is accomplished by means of parts called rams. It is
necessary to change the rams when drill pipe or tubing of a different size than
that previously used is put in service.
Chart
Sea-bed map; shows water depth,
obstacles (pipelines, wrecks), sediment nature or features.
Chart
(bathymetric)
A topographic chart of the bed of a body
of water, or a part of it. Generally, bathymetric chart show depths by contour
lines and gradient tints.
Chart
(nautical)
A chart specifically designed to meet
the requirements of marine navigation, showing depths of water, nature of
bottom, elevations, configuration and characteristics of coast, dangers and
aids to navigation. Also called marine chart, hydrographic chart, or simply
chart.
Chart
compilation
The production of a new or revised map
or chart, or portions thereof, from existing maps, aerial photographs, surveys,
new data and other sources or the selection, assembly, and graphic
representation of all relevant information required for the preparation of a map
or chart.
Chart
sounding datum
The tidal datum to which soundings and
drying heights on a chart are referred. It is usually taken to correspond to a
low water stage of the tide. Often shortened to chart datum, especially when it
is clear that reference is not being made to a horizontal datum.
Charter-party
An agreement wherein the shipowner hires
his vessel to the charterer subject to certain conditions.
Check valve
A valve that permits flow in one
direction only.
Chemical
change
A change in a substance which has
affected its chemical composition.
Chemical
reaction
The interaction of two or more
substances when chemical changes take place.
Choke
A gauged restriction inserted into a
fluid flow line in order to restrict the flow rate.
Choke line
An extension of pipe from the blowout
preventer assembly used to direct well fluids from the annulus to the choke
manifold.
Choke
manifold
The arrangement of piping and special
valves, called chokes, through which drilling mud is circulated when the
blowout preventers are closed to control the pressures encountered during a
kick. See choke and blowout.
Choke plates
Two circular plates each with a pair of
precise orifices. One plate is fixed in the valve body while the other rotates
through a controlled range to expose all or part of the orifice flow area.
Christmas
tree
An array of pipes and valves fitted to a
production wellhead to control the flow of oil or gas and prevent a possible
blowout.
Christmas
tree (marine)
A subsea production system similar to a
conventional land tree except it is assembled complete for remote installation
on the sea floor, with or without diver assistance. The marine tree is
installed from the drilling platform; it is lowered into position on guide cables
anchored to foundation legs implanted in the ocean floor. The tree is then
latched mechanically or hydraulically to the wellhead by remote control.
Cimmerian
unconformity
A period of emergence and subsequent
erosion that occurred at the end of the Jurassic Period and was followed by
further deposition of sediments. See unconformity.
Circulate
To pass from one point throughout a
system and back to the starting point. For example, drilling fluid is
circulated out of the suction pit, down the drill pipe and drill collars, out
the bit, up the annulus, and back to the pits.
Circulate
bottoms up
To wash rock cuttings from the bottom of
the hole to the surface by maintaining circulation after halting the drilling
operation. This allows time for the closer inspection of the cuttings and for a
decision as to how to proceed when encountering a certain formation.
Circulation
The process of continuously pumping
drilling mud down through the drill string and up the annulus during drilling
operations.
City gate
A measuring station, which may also
include pressure regulation, at which a distribution gas utility receives gas
from a natural gas pipeline company or the transmission system.
Clabbered
A slang term commonly used to describe
moderate to severe flocculation of mud due to various contaminants; also called
gelled-up.
Clamp
connection
Clamps used instead of flanges to join
and hold wellhead parts together.
Clastic rocks
Sedimentary rocks composed of fragments
of pre-existing rocks. Sand- stone is a clastic rock.
Clean oil
Crude oil containing less than an agreed
percentage sediment and water (BS&W); pipeline oil; oil clean enough to be
accepted by a pipeline for transmission, or by a refinery. Also called dry oil
or dry crude.
Clean-up trip
Running the drill pipe into the hole for
circulation of mud only; to clean the bore hole of cuttings.
Closed in
Refers to a well, capable of producing,
that is shut-in.
Closure
Exists in a reservoir rock where the
shape of the upper surface of that rock is suitable for the trapping of oil
and/or gas.
Cloud point
The temperature at which paraffin wax
begins to crystallise or separate from the solution, imparting a cloudy
appearance to the oil as it is chilled under prescribed conditions.
CNPC
China National Petroleum Corporation
Coagulation
In drilling-fluid terminology, a synonym
for flocculation.
Coal
A solid fossil fuel consisting mainly of
carbon produced by the compression of decayed plants.
Coal
gasification
The manufacture of fuel gas from coal.
Coal measures
The various strata which contain seams
of coal.
Cocked hat
Triangle on chart, formed by three
position lines that do not cross at one point. Also called triangle of error.
Coding delay
An arbitrary time delay in the
transmission of pulse signals. In the Loran system this is inserted between the
transmission of master and slave signals to prevent zero or small readings, and
aid in distinguishing between master and slave station signals.
Cohesion
The attractive force between the same
kind of molecules, i.e., the forces which hold the molecules of a substance
together.
Coke
Hard carbon, and other crude oil
impurities, which can form inside furnace tubes, etc.
Colloid
A state of subdivision of matter which
consists either of single large molecules or of aggregations of smaller
molecules dispersed to such a degree that the surface forces become an
important factor in determining its properties. The size and electrical charge
of the particles determine the different phenomena observed with colloids,
e.g., Brownian movement.
Colorimeter
An instrument for determining the colour
of oil products by measuring the percentage transmission of monochromatic
colour through the liquid.
Combination
string
A casing string that has joints of
various collapse resistance, internal yield strength, and tensile strength
designed for various depths in a specific well to best withstand the conditions
of that well. In deep wells, high tensile strength is required in the top
casing joints to carry the load, whereas high collapse resistance and internal
yield strength are needed for the bottom joints. In the middle of the casing,
average qualities are usually sufficient. The most suitable combination of
types and weights of pipe helps to ensure efficient production at a minimum
cost.
Coming out of
hole
The withdrawing of the drill string from
the well bore.
Commercial
field
An oil and/or gas field judged to be
capable of producing enough net income to make it worth developing.
Compact head
A combined casing/tubing head which can
receive as many as two casing strings plus one tubing string, allowing normal
drilling and completion operation to be completed through one single blow-out
preventer system.
Company
representative
An employee of an operating company
whose job is to represent company's interests at the drilling location. Also
called company man.
Compass
(fluxgate)
A compass based on the fluxgate
principle (use of wire wound saturable core inductor to measure).
Compass
(gyroscopic)
A compass having one or more gyroscopes
as the directive element, and tending to indicate true north. Also called gyro
compass.
Compass
(magnetic)
A compass depending for its directive
force upon the attraction of the magnetism of the earth for a magnet free to
turn in an horizontal direction.
Compass
bearing
See bearing.
Compatt
Acoustic Computing and Telemetering
Transponder made by Sonardyne. Intelligent acoustic underwater measuring device
that measures to other Compatts and DMTs.
Compensators
Hydraulically operated equipment that
compensates for the upward and downward motion (heave) of a floating rig or
drill ship during drilling operations.
Complete a
well
To finish work on a well and bring it to
productive status. See well completion.
Completion
The process by which a finished well is
either sealed off or prepared for production by fitting a wellhead.
Compound
A mechanism used to transmit power from
the engines to the pump, drawworks, and other machinery on a drilling rig. It
is composed of clutches, chains and sprockets, belts and pulleys, and a number
of shafts, both driven and driving. To connect two or more power-producing
devices (as engines) to run one piece of driven equipment (as the drawworks).
Compound
interest
Interest calculated on the basis of the
principal plus accumulated interest, rather than on the principal alone.
Compressor
Equipment used to compress gas for
re-injection into a well or for pumping through a pipeline.
Concession
A licence area that is leased to a
company for a given period for exploration and development under specified
terms and conditions.
Concrete
platform
A production platform made of reinforced
concrete rather than steel.
Condensates
See liquefied petroleum gas.
Condenser
Equipment for changing a material from
its vapour state to its liquid state.
Conductivity
(thermal)
The rate of transfer of heat along a
body.
Conductor
In an electrical sense, a body capable
of carrying an electric current; in a thermal sense, a body which will permit
heat to flow through it. As a general rule, metallic materials are good
conductors of electricity and heat, while non-metallic materials are poor
conductors or insulators.
Conductor
pipe
A short string of large-diameter casing
used to keep the top of the well bore open and to provide a means of conveying
the up-flowing drilling fluid from the well bore to the mud pit.
Cone
penetrometer test
Geotechnical term for a cone shaped body
being pushed into the ground at a constant speed. Also known as CPT.
Conservation
Regulation of oil and/or gas production
from a reservoir in order to prolong its life and hopefully recover a larger
quantity of the oil or gas in place; re-injection of associated gas for future
use.
Consignee
Person or party to whom goods are
delivered.
Consistency
The viscosity of a non-reversible fluid,
in poises, for a certain time interval at a given pressure and temperature.
Consortium
A group of unrelated companies who act
together in a particular venture.
Consumables
Materials continuously required to keep
present operations and processes functioning properly (the "bolts and
nuts").
Containment
boom
A floating, flexible boom placed on the
surface of the sea in order to contain an oil slick.
Continental
shelf
The edge of a continental mass that lies
under the sea in comparatively shallow water (up to a water depth of
Contour
(contour lines)
Line of equal depth drawn on a map or
chart; one way of representing height variations, another being spot depth
charts.
Contour
interval
The difference in elevation between
adjacent contours.
Contract
depth
The depth of the well bore at which the
drilling contract is fulfilled.
Control
A system of points with established
positions or elevations, or both, which are used as fixed references in
positioning and correlating map features. Control is generally classified in
four orders (with first order denoting highest quality) according to the precision
of the methods and instruments used in establishing it, and the accuracy of the
resultant positions and elevations. Often called basic control. Regulation or
direction of a machine, electronic equipment, etc.; or the dial. knob. switch.
etc. for performing this function. The exercise of directing influence over the
movements of a craft or missile. with particular reference to changes in
direction and speed.
Convection
Transference of heat through a liquid or
gas by the actual movement of the fluid.
Conversion
The process whereby appliances, furnaces
or boilers are modified so that they can burn a different fuel than that for
which they were originally designed
Conversion
oil
Feedstock used in the manufacture of
carbon black.
Cool down
volume
Volume of LNG required to cool down tank
walls of a vessel prior to loading. This volume then returns to shore in the
gas phase.
Cooler
Equipment used to cool a stream by
giving up heat to a cool water stream. or the atmosphere.
Coordinate
(origin of)
The point of intersection of the
coordinate axis, from which the coordinates are reckoned. In mathematical
treaties, this origin is usually given the coordinates 0,0; in surveying,
however, it is standard practice to give this origin, coordinates having large
positive numerical values, thereby avoiding the use of negative coordinates.
Also called point of origin.
Coordinate
(system)
A fixed system of lines used to define
the position of a point, line, or plane.
Coordinates
Linear or angular quantities which
designate the position of a point in relation to a given reference system.
Coordinates
(geodetic)
Quantities which define the horizontal
position of a point on the spheroid of reference with respect to the planes of
Geodetic Equator and of a selected Geodetic Meridian. See latitude (geodetic).
Coordinates
(geographical)
A system of spherical coordinates for
defining the position of points on the Earth.
Coordinates
(grid)
A plane rectangular coordinates system
based on, and mathematically adjusted to, a map projection, so that geographic
positions in terms of latitude and longitude can be readily transformed into
plane coordinates, and the computation relating to them made by the ordinary
methods of plane surveying.
Coordinates
(rectangular)
Coordinates on any system in which the
axes of reference intersect at right angles.
Coordinates
(spherical)
A system of polar coordinates in which
the origin is the centre of a sphere and the points all lie on the surface of a
sphere. The polar axis of such a system cuts the sphere at its two poles.
Copolymer
A polymer manufactured from two or more
different monomers. See butadiene-styrene copolymer.
Core
The cylindrical section of rock or
sediments obtained when a core barrel with an annular bit is withdrawn from a
well during drilling.
Core analysis
Laboratory analysis of a core sample to
determine porosity, permeability, lithology, fluid content, angle of dip,
geological age, and probable productivity of the formation.
Core barrel
The hollow pipe section above the
annular bit that collects and holds a core.
Core catcher
The part of the core barrel that holds
the formation sample.
Core
cutterhead
The cutting element of the core barrel
assembly. In design it corresponds to one of the three main types of bits: drag
bits with blades for cutting soft formations; roller bits with rotating cutters
for cutting medium hard i formations; and diamond bits for cutting very hard
formations.
Correction
(atmospheric)
The statistical removal of
meteorological effects from mean sea level changes.
Correction
(ionospheric)
A correction for errors introduced by
ionospheric refraction occurring when signals travel through the ionosphere.
Correction of
soundings
The correction of the observed depths
for any departure from true depth due to the method of sounding or to a fault
in the measuring apparatus. See also reduction of soundings.
Corrosion
The progressive breakdown of a metal
structure by chemical or electrolytic attack, e.g. rusting.
Cost and
freight (C & F)
The type of contract in which the seller
provides the product and the vessel and delivers the product to the nominated
discharge port. See incoterms.
Cost,
insurance and freight (C.I.F.)
The type of contract in which the seller
provides the product and the vessel, procures the insurance and delivers the
product to the nominated discharge port. See incoterms.
Counter
weight
One of (usually) a set of weights,
attached to the crank or to the tail end of the walking beam, or both, of a
pumping unit, to counter-balance the weight of the sucker rods and part of the
weight of the fluid column above the pump.
Coupling
In piping, a metal collar with internal
threads used to join sections of threaded pipe. In power transmission, a
connection extending longitudinally between a driving shaft and a driven shaft.
Most such couplings are flexible and compensate for minor misalignment of the
two shafts.
Course made
good
The resultant horizontal direction of
actual travel. The direction of a point of arrival from a point of departure.
Coventurer
A person or company joined with others
in a particular venture. See consortium.
CPT
See cone penetrometer test.
Crack a valve
To open a valve so slightly as to permit
a small amount of liquid or gas to pass through.
Cracking
The process whereby hydrocarbon
molecules of high molecular weight are broken down to lighter molecules.
Crane barge
A barge that carries a large crane (or
cranes) for use in assembling or repairing offshore structures.
Crater (to
crater)
Term meaning the hole is caving in. To
crater refers to the results that sometimes accompany a violent blowout during
which the surface surrounding the well bore falls into a large hole blown in
the earth by the force of escaping gas, oil and water. The crater sometimes
covers an area of several hundred feet.
Creep
The process whereby a pipeline expands
and becomes longer due to high pressure or temperature variation of its
contents and thus tends to shift its position on the sea bed.
Cretaceous
period
The period of geological time which
began roughly 130 million years ago and ended roughly 60 million years ago.
Crew
See drilling crew.
Critical
pressure
The pressure above which vapour and
liquid of a pure material cannot exist in equilibrium
Critical
temperature
The maximum temperature at which a gas
can be liquefied; that is, the temperature above which a liquid can not exist.
Crooked hole
A well bore that has deviated from the
vertical. It usually occurs in areas where the subsurface formations are
difficult to drill, such as a section of alternating hard and soft strata
steeply inclined from the horizontal.
Cross-talk
Undesirable interference across the two
channels of a side scan sonar, due to above normal signal strength.
Crown
The uppermost section of a derrick.
Crown block
The fixed system of pulleys fitted at
the top of a derrick for use in raising and lowering the drill string, casing
etc.
Crude assay
A procedure for determining the general
distillation and quality characteristics of crude oil.
Crude oil
The oil that is produced from a
reservoir (after any associated gas has been removed); often referred to simply
as crude.
Cubic foot
The standard unit used to measure
quantity of gas (at atmospheric pressure); one cubic foot =
Cumulative
production
The sum of volume or mass produced from
a well or train or field calculated from the first day of production until a
specified date.
Current
Water or other fluids in essential
horizontal motion. In British terminology, a non-periodical movement of water,
generally horizontally, due to many causes such as different temperatures and
prevalent winds. Some may be temporary, others permanent.
Current meter
An instrument for measuring the speed of
a current. It may also measure direction of flow.
Cuttings
The fragments of rock dislodged by the
bit and brought to the surface in the drilling mud. Washed and dried samples of
the cuttings are analysed by geologists to obtain information about the
formation drilled.
Cyclic
The term applied to an organic molecule
that contains a ring structure (saturated or unsaturated).
Cycloalkane
The cyclic form of an alkane (e.g.
cyclohexane).
Cycloalkene
The cyclic form of an alkene (e.g.
cyclohexene).
Cyclohexane
The cyclic form of hexane; used as a raw
material in the manufacture of nylon.
Cyclone
A vessel used to separate solids. e.g.
dusts, from gases by centrifugal action. Also weather phenomenon. See tropical
cyclone.
Cycloolefin