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Term

Common Meaning

AAPG

American Association of Petroleum Geologists

AAPL

American Association of Petroleum Landmen

Abaft

1. toward the stern of a ship or mobile offshore drilling rig. 2. behind. 3. farther than aft.

Abandon

1. to cease efforts to produce oil or gas from a well, and to plug a depleted formation and salvage all material and equipment. 2. to cease producing oil and gas from a well when it becomes unprofitable. A wildcat well may be abandoned after it has proven nonproductive. Several steps are involved in abandoning a well; part of the casing may be removed and salvaged; one or more cement plugs are placed in the borehole to prevent migration of fluids between the different formations penetrated by the borehole; and the well is abandoned. In many states, it is necessary to secure permission from official agencies before a well may be abandoned.

Abnormal pressure

pressure exceeding or falling below the normal pressure to be expected at a given depth. Normal pressure increases approximately 0.465 psi per foot of depth (10.5kPa per meter of depth). Thus, normal pressure at 10,000 feet is 4,650 psi; abnormal pressure at this depth would be higher or lower than 4,650 psi. See pressure gradient.

Aboard

on or in a ship, offshore drilling rig, or helicopter

Abrasion

wearing away by friction.

ABS

American Bureau of Shipping

Absolute humidity

the amount of moisture present in the air, usually expressed in grains of water per 100 cubic feet of air (milligrams of water per cubic meter of air).

Absolute permeability

a measure of the ability of a single fluid (such as water, gas, or oil) to flow through a rock formation when the formation is totally filled (saturated) with a single fluid. The permeability measure of a rock filled with a single fluid is different from the permeability measure of the same rock filled with two or more fluids. See effective permeability.

Absolute porosity

the percentage of the total bulk volume of a rock sample that is composed of pore spaces or voids. See porosity.

Absolute pressure

total pressure measured from an absolute vacuum. It equals the sum of the gauge pressure and the atmospheric pressure corresponding to the barometer (expressed in pounds per square inch).

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