| finger [`fiŋ·gǝr] ANATOMY Any of the four digits on the hand other than the thumb. GEOLOGY The tendency for gas which is displacing liquid hydrocarbons in a heterogeneous reservoir rock system to move forward irregularly (in fingers), rather than on a uniform front. PETROLEUM ENGINEERING A pair or set of bracketlike projections placed at a strategic point in a drill tripod or derrick to keep a number of lengths of drill rods or casing in place when they are standing in the tripod or derrick. |