Steerable underreaming bottom hole assembly and method

Details Steerable underreaming bottom hole assembly and method Steerable underreaming bottom hole assembly and method

2005-02-01

2005-02-01

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Processes

Boring curved or redirected bores

C175S062000, C175S074000

Reexamination Certificate

active

06848518

ABSTRACT:
A steerable bottom hole assembly may be used for drilling both a curved section and straight section of the borehole, with the bottom hole assembly including a reamer beneath the downhole motor12. The bottom hole assembly includes a bit30having a bit face defining a bit diameter, and a gauge section32having a substantially uniform diameter cylindrical surface approximating the bit diameter and having an axially length of at least 75% of the bit diameter. The motor is preferably run slick without stabilizers for engaging the wall of the borehole.

REFERENCES:
patent: 4612987 (1986-09-01), Cheek
patent: 4616719 (1986-10-01), Dismukes
patent: 5060736 (1991-10-01), Neff
patent: 6059051 (2000-05-01), Jewkes et al.
patent: 6213226 (2001-04-01), Eppink et al.
patent: 6269892 (2001-08-01), Boulton et al.
patent: 6419033 (2002-07-01), Hahn et al.
patent: 6470977 (2002-10-01), Chen et al.
patent: 1012545 (2000-12-01), None
patent: 1435339 (1976-05-01), None

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