GLOSSARY 



Acidize - To treat oil-bearing limestone or carbonate formations with acid in 

 order to increase production. 



Aerator - An apparatus for intimately admixing water and air. 



Aggradation - In geology, the natural filling up of the bed of a watercourse 

 by deposition of sediment. 



Allochthonous - A term applied to constituents which have been transported to 

 their present location from their original generation site. 



Anastomosis - The union of parts or branches (as of streams, blood vessels, or 

 leaf veins) so as to intercommunicate. 



Angiosperm - Any of a class of vascular plants having the seeds in a closed 

 ovary. 



Anode - The positive terminal of an electrolytic cell. 



Annual windrose - A graphic device that shows average wind conditions over a 

 long period of time for a particular location. The length of each 

 of 8 (or 16) direction shafts is proportional to the percentage of 

 time that the wind has been observed to blow from that part of the 

 compass. 



Annulus or Annular space - The space surrounding a cylindrical object within a 

 cylinder, the space around a pipe suspended in a wellbore is often 

 termed the annulus, and its outer wall ray be either the wall of the 

 bore hole or the casing. 



Anthropogenic - Of, relating to, or influenced by the impact of man on nature. 



Auger - A tool' for boring holes in soil, consisting of a shank with a crosswise 

 handle for turning, a central tapered screw, and a pair of cutting 

 lips. 



Balls - A collection or mass of sticky, consolidated material - usually shale 

 drill cuttings - on drill pipe, drill collars, tool joints, etc. 

 The condition frequently results from inadequate pump pressure or 

 insufficient volume of drilling fluid. 



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