E
FIXED CONSTRUCTIONS
E
FIXED CONSTRUCTIONS
E21
EARTH OR ROCK DRILLING; MINING
E21
EARTH OR ROCK DRILLING; MINING
E21B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B2200/00
Special features related to earth drilling for obtaining oil, gas or water
E21B2200/00
Special features related to earth drilling for obtaining oil, gas or water
E21B2200/20
Computer models or simulations, e.g. for reservoirs under production, drill bits
E21B2200/20
Computer models or simulations, e.g. for reservoirs under production, drill bits