Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods

Introduced: September 1968

Last revised: January 2006

Full Title

Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables > Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods

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

Scope Notes

Limiting references: Handling reeled pipe or rod units, e.g. flexible drilling pipes Automatic control of the tool feed

7 direct subcodes

Child Classifications

Navigate with arrow keys, Enter to open

E21B 19/081 Screw-and-nut feed mechanisms
E21B 19/083 Cam, rack or like feed mechanisms
E21B 19/084 with flexible drawing means, e.g. cables
E21B 19/086 with a fluid-actuated cylinder
E21B 19/087 by means of a swinging arm
E21B 19/089 with a spring or an additional weight
E21B 19/09 specially adapted for drilling underwater formations from a floating support using heave compensators supporting the drill string