E21BLevel 3

EARTH OR ROCK DRILLING

**Definition:** This place covers:

Earth drilling, e.g. deep drilling; obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells. This subclass also includes drilling at shallow depths but over extended distances, such as drilling for laying a pipeline under surface obstacles.

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E21B 1/00Methods or apparatus for drilling

E21B 10/00Drilling tools

E21B 11/00Other drilling tools

E21B 12/00Accessories for drilling tools

E21B 15/00Other equipment or details for drilling

E21B 17/00Drilling rods or pipes

E21B 19/00Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick

E21B 21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor

E21B 2200/00Special features related to earth drilling for obtaining oil, gas or water

E21B 23/00Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells

E21B 25/00Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors

E21B 27/00Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, for collecting mud or sand

E21B 28/00Vibration generating arrangements for boreholes or wells, e.g. for stimulating production

E21B 29/00Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows

E21B 3/00Rotary drilling

E21B 31/00Fishing for or freeing objects in boreholes or wells

E21B 33/00Sealing or packing boreholes or wells

E21B 34/00Valve arrangements for boreholes or wells

E21B 35/00Methods or apparatus for preventing or extinguishing fires

E21B 36/00Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones

E21B 37/00Methods or apparatus for cleaning boreholes or wells

E21B 4/00Drives for drilling, used in the borehole

E21B 40/00Tubing catchers, automatically arresting the fall of oil-well tubing

E21B 41/00Equipment or details not covered by groups

E21B 43/00Obtaining fluids from wells

E21B 44/00Automatic control, surveying or testing

E21B 45/00Measuring the drilling time or rate of penetration

E21B 47/00Survey of boreholes or wells

E21B 49/00Testing the nature of borehole walls

E21B 6/00Drives for drilling with combined rotary and percussive action

E21B 7/00Special methods or apparatus for drilling

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