Hydraulic fluid coupling

Details Hydraulic fluid coupling Hydraulic fluid coupling

2007-06-05

2007-06-05

Neuder, William P. (Department: 3672)

Boring or penetrating the earth

Processes

Boring curved or redirected bores

C175S073000

Reexamination Certificate

active

10974592

ABSTRACT:
For use in a wellbore containing a rotary drill string and a drill bit, the combination comprising, a rotary mandrel containing a through opening to pass drilling fluid downwardly from the interior of the drill string, and toward the bit, a non-rotary housing extending about the mandrel, a plenum or plenums in the housing in communication with the interior of the mandrel through an opening to receive fluid pressure used to actuate means associated with drilling activity in the well, and a controlled fluid gap proximate the housing, to slowly leak drilling fluid to the annulus outside the string.

REFERENCES:
patent: 4302033 (1981-11-01), Evans et al.
patent: 4449738 (1984-05-01), Hotger
patent: 5289846 (1994-03-01), Elias et al.
patent: 5547031 (1996-08-01), Warren et al.
patent: 5816273 (1998-10-01), Milocco et al.
patent: 6286541 (2001-09-01), Musschoot et al.
patent: 6402507 (2002-06-01), Boettger

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