CPC Subgroup
E21B 33/12 Packers; Plugs (used for cementing E21B33/134, E21B33/16)
Full Title
Sealing or packing boreholes or wells > in the borehole > Packers; Plugs (used for cementing E21B33/134, E21B33/16)
8 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 (E21B33/122, E21B33/124 take precedence)
- E21B 33/127 with inflatable sleeve (E21B33/122, E21B33/124 take precedence)
- E21B 33/128 with a member expanded radially by axial pressure (E21B33/122, E21B33/124 take precedence)
- E21B 33/129 with mechanical slips for hooking into the casing (E21B33/122, E21B33/124 take precedence)