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

Introduced: September 1968

Last revised: January 1990

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

Description

E21B encompasses drilling techniques, equipment, and systems for accessing subsurface resources including oil, natural gas, water, and mineral deposits. This subclass covers drilling apparatus (rigs, bits, pipe strings), well construction methods, borehole management, and extraction technologies for both solid minerals (ores, salts) and fluids. Related technologies include mud systems, pressure control, wellbore stabilization, and completion equipment used throughout the drilling and production lifecycle.

Related Keywords

deep drilling BOREHOLESBORING deep wellsDEEP DRILLINGDRIFT(S) boringearth drilling; deep drillingbore HOLE(S)deep WELL(S)

30 direct subcodes

Child Classifications

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E21B 1/00 Percussion drilling
E21B 10/00 Drill bits
E21B 11/00 Other drilling tools
E21B 12/00 Accessories for drilling tools
E21B 15/00 Supports for the drilling machine, e.g. derricks or masts
E21B 17/00 Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings
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
E21B 21/00 Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
E21B 23/00 Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
E21B 25/00 Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
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
E21B 28/00 Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
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
E21B 3/00 Rotary drilling
E21B 31/00 Fishing for or freeing objects in boreholes or wells
E21B 33/00 Sealing or packing boreholes or wells
E21B 34/00 Valve arrangements for boreholes or wells
E21B 35/00 Methods or apparatus for preventing or extinguishing fires
E21B 36/00 Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
E21B 37/00 Methods or apparatus for cleaning boreholes or wells