using impression packers, e.g. to detect recesses or perforations

Full Title

Survey of boreholes or wells > Locating or determining the position of objects in boreholes or wells; Identifying the free or blocked portions of pipes > using impression packers, e.g. to detect recesses or perforations

Classification Context

Section:

FIXED CONSTRUCTIONS

Class:

EARTH OR ROCK DRILLING; MINING

Subclass:

EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS