Process of dismantling wellhead,
production and transportation facilities and restoration of depleted
producing areas in accordance with licence
requirements and /or legislation.
Acid
stimulation
Form of hydrochloric acid is pumped down well hole to enlarge
pore space in oil bearing rocks to increase flow and recovery.
Acoustic
log
Record of time taken by a sound wave to travel over a certain
distance through geological formations.
Air
injection
An enhanced recovery technique in which
air is injected into hydrocarbon formation to increase reservoir pressure.
A well completed to produce from two separate reservoirs.
Enhanced
reach
Deviated wells (over 65 degrees)
from vertical and reach out horizontally more than twice vertical
depth.
Field
Geographical area under which an oil or gas reservoir
lies.
Field Nomenclature
Field ceased production (FCP)
Field under development (FUD)
Field in production (FIP)
Flaring
and venting
Flaring is burning of hydrocarbon gases for commercial or
technical reasons. Venting is release of gases to atmosphere.
Flare
Stack
Steel structure on an offshore installation or at a processing
facility from which gas is flared.
Gas Cap
In field containing both gas and oil,
some gas will often collect at top of reservoir
in a single deposit.
Gas/Condensate
field
Reservoir containing both natural
gas and oil, with greater
proportion of gas. Condensate appears when gas in drawn from
well, and its temperature and pressure change sufficiently for
some of it to became liquid petroleum.
Supporting (concrete base or steel legs) structure for an
offshore installation.
Marine Riser
Pipe connecting offshore installation to a subsea wellhead
or pipeline for drilling or production
purposes.
Module
Self-contained box or package built
with a specific purpose (for example, well head, oil and gas
separation, gas compression, platform power generation, mud,
storage, diesel, filter and exhaust) located on production installations.
Multilateral
well
More than one horizontal
section drilled in one well. Used to maximise number of wells
that can be drilled from small installations.
Device for cleaning a pipeline or
separating two liquids being moved down pipeline. (Intelligent
pig - fitted with sensors to check for corrosion or defects in
pipelines.)
Piling
Long steel piles driven into the seabed
to anchor fixed offshore structures solidly in place.
Pipeline
A pipe through which natural
gas, crude oil or petroleum
products are pumped between two points, either onshore or offshore.
Plateau
Level of peak oil or gas field production;
it is always followed by declining level of production.
Platform
Fixed structure resting on seabed or piled
into it.
Brines naturally present or injected into reservoir
to enhance production. Produced along side oil production.
Production
Drilling
Drilling of wells in order to bring a field into production.
Production
Installation
An installation from which development
wells are drilled and that carries all associated processing
plants and other equipment needed to maintain a field
in production.
Plant installed in a gas pipeline system to
catch unwanted "slugs" of liquid.
Subsea
manifolds
Allows wells to be put on production without need to build
a platform to operate and maintain wells.
Sub-sea
wellhead
A wellhead installed on
the sea floor and controlled remotely from a platform, a floating
production facility or land.
Substructure
Support form of an offshore installation on which derrick,
engines, helicopter pad, cranes, etc. are installed.
Tension Leg Platform
A floating offshore structure held in position by a number
of tension-maintaining cables anchored to seabed. Cables dampen
wave action to keep platform stationary.
Terminal
Onshore transit installation that receives oil or gas from
offshore production facilities via pipeline
and / or tankers. Plant and equipment designed to receive and
process crude oil or gas to remove water and impurities.
Water is pumped into alternate wells in a field.
Pressure in reservoir as a whole can
be maintained or increased and production can be maintained or
increased.
Re-entry into a completed field well
for modification or repair. Restoring well productivity by cleaning
out accumulations of sand, silt or other substances that clog
production tubing.