Technical
Thesaurus oil & gas
I
IAEE
International Association
for Energy Economics
IEA
International Energy Agency
Igneous rock
Rocks that were formed by
the solidification of molten magma.
Ignition point
Temperature to which a
substance can be heated before it will burn.
IGU
International Gas
Immiscible
Incapable of being mixed to
form a homogeneous mixture, e.g. oil and water.
Impermeable
Preventing the passage of
fluid. A formation may be porous yet impermeable if there is an absence of
connecting passages between the voids within it. See permeability.
Incineration areas (at sea)
An offshore area officially
designated as suitable for the burning of chemical waste by specially equipped
ships.
Inclination
The angle which a line or
surface makes with the vertical, horizontal or with another line or surface.
Incoterms
A set of international
rules for the interpretation of the chief terms used in foreign trade
contracts. It is published by the International Chamber of Commerce
Inert
Unreactive. Resistant to
chemical reactions with other substances.
Infill drilling
Wells drilled to fill in
between established producing wells; a drilling programme to reduce the spacing
between wells in order to increase production from the field.
Injection moulding
A plastics-forming process
in which molten plastic is forced into a mould under pressure and allowed to
solidify.
Injection well
A well used to inject gas
or water into the reservoir rock in order to maintain reservoir pressure in secondary
recovery or (in the case of gas) for conservation purposes.
Inland barge rig
A drilling structure
consisting of a barge upon which the drilling equipment is constructed. When
moved from one location to another, the barge floats, but, when stationed on
the drill site, the barge is submerged to rest on the bottom. Typically, inland
barge rigs are used to drill wells in marshes, shallow inland bays, and in
areas where the water covering the drill site is not too deep.
Insoluble
A solid chemical substance
which will not dissolve in a given liquid over a specified temperature range.
Inspection Manager Machine
Inspection Manager machine
is a system that is currently running Inspection Manager Eventing Module.
Instrumentation
A device or assembly of
devices designed for one or more of the following functions: to measure
operating variables (as pressure, temperature, rate of flow, speed of rotation,
etc.); to indicate these phenomena with visible or audible signals; to record
them; to control them within a predetermined range; and to stop operations if
the control fails. Simple instrumentation might consist of an indicating
pressure gauge only. In a completely automatic system, the desired range of
pressure, temperature, and so on is predetermined and preset.
Instruments
Devices for the measurement
and control of variable quantities. These include indicators, recorders,
controllers, transmitters and integrators for measurements such as temperature,
pressure, pH value, flow rate, liquid level, etc.
Integrated
Applies to navigation:
integrated radio positioning and acoustic positioning; or to integrated
geophysical and geotechnical studies; or to any two computer systems that can
be made to interchange information.
Interest
An amount paid for the use
of loan capital. See compound interest, simple interest, loan capital.
Interface
A surface, usually plane,
forming the boundary between adjacent solids, spaces or immiscible liquids. In
data processing it describes all information (signals, data) and the
specifications ("protocol") required for ex- changing data between
two units of a system. Interfaces exist between hardware and software units but
also between computer and human user.
Interference
Extraneous signals, noises,
etc., that hinder proper reception of the desired signal in electronic
equipment.
Intermediate casing string
The string of casing set in
a well after the surface casing, but before the production casing, to keep the
hole from caving and to seal off trouble- some formations. The string is
sometimes called protection casing.
Intermediate chemicals
Chemicals which are derived
from basic petrochemicals and are themselves used to manufacture other
chemicals or products.
Interpolate
To determine intermediate
values between given values in accordance with some known or assumed trend or
rate of variation.
Interstitial water
Water present in the pores
of the oil- or gas-bearing zone of a reservoir rock.
Inventory
Stock. The quantity of raw
materials or spare parts available for use, or the quantity of product
available for sale.
Ion
Positively or negatively
charged atom or group of atoms.
IP
IPE
International Petroleum
Exchange of
IPIECA
International Petroleum
Industry Environmental Conservation Association
Isobutane
The branched form of butane;
used in the manufacture of isooctane, one of the components of high-quality
motor and aviation fuel.
Isomers
Different molecular
structures of a chemical compound, e.g. n-butane and isobutane, the two isomers
of C4H 10.
Isopach map
A geological map which
gives the thickness of a particular stratum.