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IPC Subgroup
E21B 33/12

Packers; Plugs

Introduced: September 1968

Last revised: January 2006

Full Title

Sealing or packing boreholes or wells > in the borehole > Packers; Plugs

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

6 direct subcodes

Child Classifications

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  • E21B 33/122 Multiple-string packers
  • E21B 33/124 Units with longitudinally-spaced plugs for isolating the intermediate space
  • E21B 33/126 with fluid-pressure-operated elastic cup or skirt
  • E21B 33/127 with inflatable sleeve
  • E21B 33/128 with a member expanded radially by axial pressure