Gales

10 minute sustained winds of greater than 33 knots (Beaufort force 8 or greater).

Gall

To damage or destroy a finished metal surface, as a shaft journal by moving contact with a bearing without sufficient lubrication. To chafe by friction and heat as two pieces of metal are forcibly rubbed together in the absence of lubrication.

Gamma-ray logging

Strip recording of the intensity of natural radio-activity versus depth, obtained when a suitable detector is lowered through a bore hole.

Gas anchor

A device for the bottom hole separation of oil and gas in a pumping well. The gas anchor (a length of tubing about five feet long) is inside a larger pipe with perforations at the upper end. Oil in the annulus between the well's casing and tubing enters through the perforations and is picked up by the pump; the gas goes out through the casing and is disposed of via the wef

Gas cap

A layer of natural gas above the oil in an oil reservoir.

Gas cap drive

A recovery mechanism whereby the oil from the reservoir is displaced by the downward expansion of an overlying gas cap.

Gas field

A field containing natural gas but no oil.

Gas fuel

Gas consumed by the different facilities on platforms and onshore plant for operation of equipment such as power supply. heating etc.

Gas grid

A network of pipelines used to distribute gas to industrial and domestic consumers.

Gas injection

The process whereby separated associated gas is pumped back into a reservoir for conservation purposes or to maintain the reservoir pressure.

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