Terms beginning with O

Occupational Safety and Health Administration

OCS

Offset well

Offshore drilling

Ohm

Ohmic

Ohm-meter

Ohm's law

Oil-base mud

Oil-cut

Oil emulsion

Oil field

Oil in place

Oil mud

Oil patch

Oil shale

Oil stain

Oil-water contact

Oil-water interface

Oil wet

Oleophilic

Open hole

Openhole completion

Operator

OSHA

Osmosis

Outcrop

Overburden

Overlay

Overpressure

Overshot

Oxidation-reduction potential