Device for controlling weight on bit of a drilling assembly

Details Device for controlling weight on bit of a drilling assembly Device for controlling weight on bit of a drilling assembly

1996-05-31

1998-09-15

Tsay, Frank

Boring or penetrating the earth

Automatic control

Of advance or applied tool weight

1753252, 175321, E21B 706

Patent

active

058066110

ABSTRACT:
A device for controlling weight on bit of a drilling assembly for drilling a borehole in an earth formation, is provided. The device includes a fluid passage for the drilling fluid flowing through the drilling assembly, and control means for controlling the flow resistance of drilling fluid in the passage in a manner that the flow resistance increases when the fluid pressure in the passage decreases and that the flow resistance decreases when the fluid pressure in the passage increases.

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patent: 5484029 (1996-01-01), Eddison

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