NATIONAL OILWELL VARCO, L. P.
|NATIONAL OILWELL VARCO, L. P. Patent applications|
|Patent application number||Title||Published|
|20120046869||SYSTEM AND METHOD FOR BENT MOTOR CUTTING STRUCTURE ANALYSIS - Techniques for analyzing operation of drill bit in a borehole are disclosed herein. A method for analyzing operation of a drill bit in a borehole includes providing information describing the drill bit and a bent housing coupled to the drill bit. A path of a cutter of the drill bit is determined based on a ratio of a rotational speed of the bent housing to a combined rotational speed of the drill bit and the bent housing. The combined rotational speed is different from the rotation speed of the bent housing.||02-23-2012|
|20120024602||CONTROL SYSTEM FOR MUD CLEANING APPARATUS - Techniques for controlling drilling fluid cleaning apparatus that reclaim lost circulation material from spent drilling fluid are disclosed. In one embodiment, a system includes a tank, a density separation device, and a fluid density control system. The tank holds spent drilling fluid containing drilling fluid, lost circulation material, coarse solids and fine solids. The density separation device is coupled to an outlet of the tank. The density separation device provides an overflow stream and an underflow stream. The overflow stream contains less dense material than the underflow stream. The fluid density control system is configured to adjust the density of the spent drilling fluid provided to the density separation device by recirculating a portion of the underflow stream into the tank.||02-02-2012|
|20110168014||Reciprocating Pump Having a Pressure Compensated Piston - A pump including a pressure compensated piston is disclosed. In some embodiments, the pump includes a piston with an annular body and an annular sealing element disposed radially outward of the annular body. The annular body has a radially-facing outer surface adjacent an inner surface of the sealing element and an axially-facing surface with an inlet port. A flowpath extends between the inlet port and the radially-facing outer surface of the annular body.||07-14-2011|
|20110058959||MUD PUMP CYLINDER ASSEMBLY AND LINER SYSTEM - A fluid section for a reciprocating pump comprises a cylinder assembly including a housing having a central axis, a first end, a second end opposite the first end, and a throughbore extending axially between the first end and the second end. In addition, the cylinder assembly includes a liner disposed within the throughbore of the housing. Further, the cylinder assembly includes an end cap coupled to the second end of the housing. Still further, the cylinder assembly includes an annulus radially positioned between the liner and the housing, the annulus being in fluid communication with the throughbore of the liner. Moreover, the fluid section includes a piston slidingly disposed in the throughbore of the liner. The piston is adapted to compress a fluid disposed in a pumping chamber within the liner extending axially through the throughbore of the liner between the piston and the first end of the housing.||03-10-2011|
|20100074780||A Reciprocating Pump Having a Piston Assembly - A reciprocating pump including a piston is disclosed. In some embodiments, the piston includes an annular hub, a flexible sealing element coupled to an outer surface of the hub, and a sleeve seated on the outer surface of the hub adjacent the sealing element. The sleeve is axially moveable relative to the hub to compress the sealing element. The sealing element includes a lip, which is displaced radially outward when the sleeve compresses the sealing element.||03-25-2010|
Patent applications by NATIONAL OILWELL VARCO, L. P.