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4 barrel d a gas, liquid, or solid used to prevent contact of parts in relative
motion, and thereby reduce friction and wear
5 lubricant e in drilling operations, the solid deposit along the hole wall due to
filtration of the fluid part of the mud into the formation.
6 wall cake f a structure in which rock layers slope away in all directions from a
central point
7 dome g a simple crane having lifting tackle slung from a boom
8 derrick h a well from which salt water flows after the petroleum contents are
depleted.
9 rotary rig i a flammable hydrocarbon oil used as fuel in lamps and heaters
10 salt-water j a yellowish oil obtained from whale blubber, formerly used in
well making soap and candles and as a lubricating oil and a fuel for
lamps.

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