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liquid hydrocarbons found in association
with natural gas
Associated gas
natural gas found in association with oil,
either dissolved in the oil or as a cap of
free gas above the oil
Porosity
a measure of the amount of free space or
voids in a rock, generally expressed as a
percentage of the total volume
Interstitial water
water present in the pores of the oil- or
gas-bearing zone of a reservoir rock
Pore pressure
the natural internal pressure in
a formation
Igneous rocks
rocks that were formed by the solidification
of molten magma
Swabbing
to draw out fluid from the well using a piston
Lost circulation
the loss of substantial quantities of
drilling mud into a formation, also called
loss of returns
Mineral rights
the ownership of any minerals that
may exist in the strata beneath a particular
area
Prepayment
the repayment to the bank of a specific
amount of debt under a loan agreement
before the scheduled time
Saturated hydrocarbon
a hydrocarbon with no unsaturated carbon-
to-carbon bonds in its molecule
Relief valve '
a device for relieving excess pressure in
a system, е д а rupture disc or piston
shear pin valve
Safety belt
a safety harness used by the derrick man
when working on the monkey board
Instruments
devices for the measurement and control
of variable quantities These include indicators,
recorders, controllers, transmitters
and integrators for measurements such
as temperature, pressure, рН valve, flow
rate, liquid level, etc
Return on assets (ROA)
the net profit after tax expressed as a
percentage of the total assets employed
in an enterprise
Return on investment (ROI)
the net profit after tax expressed as a
percentage of the total money invested in
an enterprise
Principal
the original sum borrowed on the basis of
which interest is calculated, see loan
capital, interest
Natural gas
a mixture of light hydrocarbons (generally
mainly methane) found naturally in the
Earth's crust, often in association with oil
(when it is known as associated gas)
Bit-breaker
a heavy metal plate which fits in the
drilling table and is used to hold the drill
bit while it is being unscrewed from the
drill collar
Key seating
the situation that occurs when the drill
string wears a groove in the high side of
a deviated well bore - this can produce
problems by causing the drill string
to stick
Crude assay
a procedure for determining the general
distillation and quality characteristics of
crude oil
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