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MMBtu

One million British thermal units, 252,000 Kilocalories or 293 Kilowatt Hours.

MMbo

Million barrels of oil.

MMcf

One million cubic feet.

Mcf

One thousand cubic feet of natural gas measured at standard pressure and temperature conditions (see "cubic foot of gas").

Mud

Drilling fluid used to lubricate the drill string, line, the walls of the well, flush cutting to the surface and create enough weight to prevent blowouts.

Multiple 49(b)

Rule governing gas well production from an oil reservoir gas cap.

Multiple Completion

The completion of a single well into more than one producing horizon. Such a well may produce simultaneously from the different horizons, or alternatively from each.