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

Child Classifications

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• E21B 1/00 Percussion drilling IPC+CPC Available in IPC and CPC
• E21B 10/00 Drill bits (specially adapted for deflecting the direction of boring ; with means for collecting substances E21B27/00) since 1980 +2 CPC IPC+CPC Available in IPC and CPC
• E21B 11/00 Other drilling tools +1 CPC IPC+CPC Available in IPC and CPC
• E21B 12/00 Accessories for drilling tools since 1980 IPC+CPC Available in IPC and CPC
• E21B 15/00 Supports for the drilling machine, e.g. derricks or masts +2 CPC IPC+CPC Available in IPC and CPC
• E21B 17/00 Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings +2 CPC IPC+CPC Available in IPC and CPC
• E21B 19/00 Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables +2 CPC IPC+CPC Available in IPC and CPC
• E21B 21/00 Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (freeing objects stuck in boreholes by flushing E21B31/03) +3 CPC IPC+CPC Available in IPC and CPC
• E21B 2200/00 Special features related to earth drilling for obtaining oil, gas or water 2nd only +10 CPC CPC only CPC only
• E21B 23/00 Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells (setting of casings, screens or liners E21B43/10) +2 CPC IPC+CPC Available in IPC and CPC
• E21B 25/00 Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors (core bits E21B10/02) +1 CPC IPC+CPC Available in IPC and CPC
• E21B 27/00 Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits +1 CPC IPC+CPC Available in IPC and CPC
• E21B 28/00 Vibration generating arrangements for boreholes or wells, e.g. for stimulating production ( for transmitting measuring-signals E21B47/14; for geophysical measurements G01V1/02) since 1995 IPC+CPC Available in IPC and CPC
• E21B 29/00 Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground +1 CPC IPC+CPC Available in IPC and CPC
• E21B 3/00 Rotary drilling IPC+CPC Available in IPC and CPC
• E21B 31/00 Fishing for or freeing objects in boreholes or wells +4 CPC IPC+CPC Available in IPC and CPC
• E21B 33/00 Sealing or packing boreholes or wells IPC+CPC Available in IPC and CPC
• E21B 34/00 Valve arrangements for boreholes or wells since 1980 IPC+CPC Available in IPC and CPC
• E21B 35/00 Methods or apparatus for preventing or extinguishing fires IPC+CPC Available in IPC and CPC
• E21B 36/00 Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones since 1980 +5 CPC IPC+CPC Available in IPC and CPC
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