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Showing definitions 11 to 20 of 85 for the letter 'a'

Acidic Having the properties of an acid. Opposite to alkaline. Acidise To treat oil-bearing limestone or other formations using a chemical reaction with acid to increase production. Hydrochloric or other acid is injected into the formation under pressure. The acid etches the rock, enlarging the pore spaces and passages through which the reservoir fluids flow. The acid is held under pressure for a period of time and then pumped out, and the well is swabbed and put back into production. Chemical inhibitors combined with the acid prevent corrosion of the pipe. Also called acidisation. Acoustic Concerning the use of sound transmissions to establish distances and transmit information Acoustic log A type of porosity log which records the time taken by an acoustic wave to travel over a certain distance through the geological formations. Also called sonic log. Additive A term used generally to indicate special chemicals which may be added to products to improve their characteristics. Adhesion The force which holds together unlike molecules. Adjustable choke A choke in which a conical needle and seat vary the rate or flow. See choke. Admiralty charts The worldwide marine charts compiled by the Royal Navy Admiralty and used by mariners and offshore users; also produced are tidal flow information and tidal prediction volumes. Aeration The technique of injecting air or gas in varying amounts into a fluid for the purpose of reducing hydrostatic head. Compare air cutting. A-frame A two-legged, metal or wooden support in the form of the letter " A " for hoisting or exerting a vertical pull with block and tackle or winch line attached to the apex of the A-frame.

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