E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/08 (2006.01) B22F 7/06 (2006.01) B23B 27/14 (2006.01) C04B 35/52 (2006.01) C04B 37/02 (2006.01) C04B 41/45 (2006.01) C04B 41/53 (2006.01) C04B 41/81 (2006.01) C04B 41/91 (2006.01) E21B 7/06 (2006.01) E21B 7/18 (2006.01) E21B 10/00 (2006.01) E21B 10/42 (2006.01) E21B 10/50 (2006.01) E21B 10/54 (2006.01) E21B 10/56 (2006.01) E21B 10/60 (2006.01) E21B 21/10 (2006.01) F16C 33/04 (2006.01)
Patent
CA 2379806
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.
Colebrook Mark
Griffin Nigel Dennis
Hughes Peter Raymond
Camco International (uk) Limited
Marks & Clerk
LandOfFree
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