Systems and methods for protecting drill blades in high...

Details Systems and methods for protecting drill blades in high... Systems and methods for protecting drill blades in high...

2011-04-05

2011-04-05

Thompson, Kenneth (Department: 3672)

Boring or penetrating the earth

With below-ground tool drive prime mover

Fluid rotary type

C416S24100B, C175S296000, C415S903000

Reexamination Certificate

active

07918290

ABSTRACT:
A drilling assembly in an elongated hole including a housing defining an interior with a plurality of motor stages in the interior. Each motor stage has at least one blade with supporting platform surfaces. A casing within the interior surrounds the plurality of motor stages and defines an annular flowpath with the housing. The casing also defines at least one offtake passage adjacent each motor stage. A shielding fluid passes through the annular flowpath and, in turn, the at least one offtake of each motor stage to coat and protect the at least one blade and supporting platform surfaces. A driving fluid passes through the casing for propelling the at least one blade of each motor stage. Preferably, the shielding fluid is at a relatively higher pressure than the driving fluid with a substantially constant ratio maintained between the between the shielding fluid and the driving fluid.

REFERENCES:
patent: 2591488 (1952-04-01), Yost
patent: 2865602 (1958-12-01), Whittle
patent: 3268017 (1966-08-01), Yarbrough
patent: 4475605 (1984-10-01), Ioanesian et al.
patent: 5101916 (1992-04-01), Lesh
patent: 7308937 (2007-12-01), Radford et al.
patent: 7686075 (2010-03-01), Stewart et al.

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