CPC Subgroup
E21B 33/13 Methods or devices for cementing, for plugging holes, crevices or the like
Full Title
Sealing or packing boreholes or wells > in the borehole > Methods or devices for cementing, for plugging holes, crevices or the like
4 direct subcodes
Child Classifications
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- E21B 33/134 Bridging plugs
- E21B 33/136 Baskets, e.g. of umbrella type
- E21B 33/138 Plastering the borehole wall; Injecting into the formation
- E21B 33/14 for cementing casings into boreholes