Units with longitudinally-spaced plugs for isolating the intermediate space

Full Title

Sealing or packing boreholes or wells > in the borehole > Packers; Plugs > Units with longitudinally-spaced plugs for isolating the intermediate space

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