Wells – Processes – With indicating – testing – measuring or locating
Reexamination Certificate
2010-04-28
2011-10-04
Neuder, William P (Department: 3672)
Wells
Processes
With indicating, testing, measuring or locating
C166S084300, C277S646000
Reexamination Certificate
active
08028750
ABSTRACT:
Force balancing adjusts hydraulic fluid pressure in an upper piston area of a Rotating Pressure Control Device (RPCD) that has an inner housing rotatably engaged within an outer housing by an upper bearing and a lower bearing. The hydraulic fluid pressure is adjusted to balance net force in a upper piston area and a lower piston area. The fluid pressure adjustment creates a force differential that balances the total load transmitted through the upper bearing and the lower bearing and thereby extends the life of the sealing element and bearings. Additionally, a wear indicator signals the end of the useful life of the drill pipe sealing element.
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Hughes William James
Pettigrew Thomas L.
Richardson Murl Ray
Vandervort Kurt D.
Young Kenneth D.
Neuder William P
Rodolph Grant
Siegesmund Rudolf O.
Sunstone Corporation
Yee & Associates P.C.
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