Coal measures

the various strata which contain seams

of coal

Specific gravity

the ratio of the density of a substance at

a particular temperature to the density of

water at 4°C

Mud weight

the density of the drilling mud - usually

recorded in pounds per gallon, the mud

weight is changed by varying the concentration

of solids in the mud

Back-up line

a wire горе used to hold one set of tongs

in place when two sections of drill pipe

are being joined or separated

Racking pipe

the act of placing lengths of pipe in an

orderly arrangement in the derrick

Catchpot

a vessel inserted in a pipeline to remove

liquid droplets or solid particles which

may be entrained in a gas stream

Gland

a sleeve which compresses the packing

around a shaft or piston

Casing seat

the lowest point in a well at which casing

is set

Dope

a lubricant for threads on pipes

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

Relinquishment requirement

an arrangement whereby oil companies

give up their license rights in unexplored

concessions after a given period of time

Exploration rig

a structure used to carry the equipment

needed for exploratory drilling - see

jack-up rig, semi-submersible rig and

drill ship

Skimmer

an anti-pollution device rather like a large

vacuum cleaner which sucks oil from the

surface of the sea

Sub-sea wellhead

a wellhead installed on the sea floor and

controlled remotely from a platform or

floating production facility or from land

Sidetracking

see sidetrack drilling

Block

see license block

Flare

an open flame used to burn off unwanted

gas, see flaring

Flaring

burning off of gas produced in association

with oil which, for technical or economic

reasons, cannot be re-injected or

shipped ashore

Filler (strainer)

device used for separation of solids or

suspended particles from liquids

Effluent

waste liquid, gas or vapor from processes

Financing

the process whereby money is obtained

to invest in a project

Flange

a projecting flat rim or collar by which

pipes are held together

Flange-up

the act of making the final connection on

a piping system

Flocculation

the process of causing individual particles

in a suspension of solids in water or

other aqueous material to collect together

in the form of floes, or wholly, cloudlike

masses The larger floe particles then

settle, or float, leaving clear fluid

Flotel

a floating accommodation rig or barge

used as quarters for offshore personnel

Choke

a gauged restriction inserted into a fluid

flow line in order to restrict the flow rate

Jets

the nozzles (usually three in number) in

the drill bit through which the drilling mud

emerges from the drill string during

drilling operations

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