1) bore hole
2) drill hole
3) well
4) borehole
a hole drilled or bored principally by mechanical means in order to explore geological conditions and/or to tap oil deposits
GRM: n. (1,2,3,4)
Note: there are many types of wells, their names being descriptive of their functions
References:
SPE confirmation well
SPE commercial well
SPE dead well
SPE crooked hole
SPE dry hole
SPE discovery well
SPE development well
SPE injection well
SPE moonpool
SPE marginal well
SPE observation well
SPE relief well
SPE slim hole
SPE shut-in well
SPE stripper well
SPE step-out well
SPE wildcat
SPE dry well
SPE deflected well
SPE paying well
SPE duster
SPE input well
SPE intake well
SPE closed-in well
SPE moonwell

ENERGY TERM COURTESY OF ENERGY.EU