Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Reexamination Certificate
2005-11-08
2005-11-08
Tsay, Frank (Department: 3672)
Boring or penetrating the earth
With below-ground tool drive prime mover
Fluid rotary type
C175S045000, C175S074000, C166S317000
Reexamination Certificate
active
06962214
ABSTRACT:
A rotary valve assembly for a rotary steerable tool is disclosed for directing flow of an abrasive laden drilling fluid; the valve assembly has a first sealing surface rotatably engaging a second sealing surface. At least one of the surfaces has at least about 5% of its area comprising interconnecting voids to an average depth of at least 0.02 mm. The interconnected voids allow fluid pressure to equalize between the sealing faces by flowing through the interconnecting voids to the sealing surfaces. Because the fit of the sealing surfaces of the valve is less than perfect, and because the voids on mating surfaces do not necessarily overlap, the 5% of the surface area comprising interconnected voids can easily translate to a 10% or more reduction in sealed area when both sealing surfaces have the interconnecting voids. The additional reduction in surface area subjected to differential pressure has substantially eliminated the hydraulic lock problem previously encountered upon startup.
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English language abstract of EP 0 459 008 A2, published Dec. 4, 1991; Applicant: Eastman Christensen Company; filed Aug. 21, 1990.
Application No. EP 02 25 1373, filed Feb. 27, 2002: European Search Report, “Documents Considered to be Relevant,” search completed Jul. 2, 2002.
Colebrook Mark A.
Griffin Nigel Dennis
Hughes Peter Raymond
Daly Jeffrey E.
Schlumberger WCP Ltd.
Tsay Frank
LandOfFree
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