Method of drilling with magnetorheological fluid

Details Method of drilling with magnetorheological fluid Method of drilling with magnetorheological fluid

2006-04-04

2006-04-04

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Processes

Boring with specific fluid

C175S065000, C166S066500

Reexamination Certificate

active

07021406

ABSTRACT:
A method of drilling a bore hole into a stratum, wherein via the drill hole drilling fluid is introduced and fed to the drill head. In order to avoid dilution or leak-off of the drilling fluid the same is in accordance with the invention a magnetorheological drilling fluid, and when an undesirable pressure difference occurs between the drilling fluid at the height of the drill head and a fluid present in the stratum surrounding the drill head, a magnetic field is applied. The inventions also provide a permanent solution.

REFERENCES:
patent: 3496902 (1970-02-01), Kern et al.
patent: 4222444 (1980-09-01), Hamilton
patent: 4579173 (1986-04-01), Rosensweig et al.
patent: 4802534 (1989-02-01), Larson et al.
patent: 2005/0028522 (2005-02-01), Fripp et al.
patent: 1 265 708 (1972-03-01), None
patent: 2079646 (1997-05-01), None

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