Houston, TX, United States

National Oilwell Varco

www.nov.com/
Houston, TX, United States

National Oilwell Varco is an American multinational corporation based in Greater Sharpstown, Houston, Texas. It is a leading worldwide provider of equipment and components used in oil and gas drilling and production operations, oilfield services, and supply chain integration services to the upstream oil and gas industry. The company conducts operations in more than 1,200 locations across six continents.The Company's common stock is traded on the New York Stock Exchange under the symbol "NOV". The company operates through four reporting segments that were reorganized in 2014: Rig Systems, Rig Aftermarket, Completion and Production Solutions, and Wellbore Technologies.Products include all the heavy hardware for oil well drilling as well as drilling instrumentation and controls and drilling power generation and control. A partial list of heavy hardware includes topdrives, rotarys, drawworks, derricks, BOPs , mud pumps, riser equipment, and complete drilling rigs. Products also include instruments and controls required on the rig floor for the drilling operation. This includes sophisticated electronics for precise control, such as the control system Cyberbase. NOV also produces control electronics for power generation and control of drilling motors and motor control centers for AC motor control.In 2008, the Houston Chronicle ranked National Oilwell Varco as the best company in Greater Houston. In 2007, the newspaper ranked National Oilwell Varco number 15.NOV is the Houston area's largest energy employer, with more than 14,500 workers in the region, according to Houston Business Journal research. Wikipedia.

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Patent
National Oilwell Varco | Date: 2017-01-11

There is described a bearing arrangement (1) for a bearing wheel (16) in a rotatable offshore structure, such as in a turret, said bearing arrangement being providable between the bearing wheel and a wheel shaft (18) around which the bearing wheel is rotatably connectable, wherein said bearing arrangement comprises a slide bearing (28) enabling said bearing wheel to slide axially on said shaft, wherein said bearing arrangement further comprises a roller bearing (34, 34). There is also described a bearing system comprising a plurality of bearing arrangements, a turret comprising such a bearing system as well as a vessel comprising such a turret. Finally there is described a method for mounting a bearing arrangement in a bearings system


Patent
National Oilwell Varco | Date: 2017-02-01

A coupling assembly comprising a coupling (217), a protective ring (201) and two tubulars (209,210), the coupling (217) of generally cylindrical shape with a channel therethrough, the coupling (217) having at least one internal thread (221,22la, 302) and two coupling ends and a pin end (213,214) of at least one of the two tubulars (209,210) having an external thread (220,220a) for threaded mating therewith so that the coupling assembly provides a connection between the two tubulars (209,210), the protective ring (201) comprising a ring body (202) for positioning adjacent an interior wall of the coupling between the two ends thereof, the ring body (202) being generally cylindrical and having a ring channel therethrough, the protective ring (201) comprises one of a tongue (203,204) and groove (205,206) and at least one of the ends of at least one of the two tubulars (209,210) having the other of a tongue (203,204) and groove (205,206).


A method, comprising acquiring annular pressure data from a wellbore where the annular pressure data is acquired over a time interval and at least a portion of the annular pressure data is acquired during a pumps-off period. At least first and second values are identified from the annular pressure data and the variation between the first and second values are compared to a first threshold. Drilling equipment is operated based on the comparison with the first threshold.


Patent
National Oilwell Varco | Date: 2017-04-12

There is described a method for estimating downhole speed and force variables at an arbitrary location of a moving drill string (13) based on surface measurements of the same variables, wherein the method comprises the steps of: a) using geometry and elastic properties of said drill string (13) to calculate transfer functions describing frequency-dependent amplitude and phase relations between cross combinations of said speed and force variables at the surface and downhole; b) selecting a base time period; c) measuring, directly or indirectly, surface speed and force variables, conditioning said measured data by applying anti-aliasing and/or decimation filters, and storing the conditioned data in data storage means which keep said conditioned surface data measurements at least over the last elapsed base time period, d) when updating of said data storage means, calculating the downhole variables in the frequency domain by applying an integral transform, such as Fourier transform, of the surface variables, multiplying the results with said transfer functions, applying the inverse integral transform to sums of coherent terms and picking points in said base time periods to get time-delayed estimates of the dynamic speed and force variables.


Patent
National Oilwell Varco | Date: 2017-06-21

A method of measuring drilling fluid properties that includes pumping drilling fluid into a feed chamber (135) of a capillary rheometer (134), said feed chamber (135) comprising a cavity (135a, 135b) and a double wall (136) defining an annulus (140) that opens to said cavity (135a, 135b) and controlling a delivery rate of said drilling fluid into said feed chamber (135) during said pumping such that a first strain rate is imparted to said drilling fluid flowing through said capillary rheometer (134). The method further includes draining said drilling fluid from said cavity (135a, 135b) through at least one drain port (144) of said feed chamber (135) and into an inlet of a capillary tube (146) coupled to said at least one drain port (144), determining a flow rate and a pressure drop of said drilling fluid flowing through said capillary tube (146) for said first strain rate, and determining a viscosity of said drilling fluid from said flow rate and said pressure drop.


Patent
National Oilwell Varco | Date: 2017-02-08

A coring assembly (10) comprises an outer barrel (14) coupled to a coring bit (16). An inner barrel (20) is disposed within the outer barrel. An inner sleeve (22) is disposed within the inner barrel and includes at least one frangible region (26) that allows the inner sleeve to break so that coring operations can continue after the occurrence of a core jam.


Patent
National Oilwell Varco | Date: 2017-05-24

A driveshaft assembly (100) includes a driveshaft (120) with a shaft axis (125), a first end (120a), and a radially outer surface. The first end includes a plurality of recesses (124) extending radially inward from the radially outer surface and each including an engagement surface (126). The driveshaft assembly also includes an end housing (130) with a receptacle (146) including a plurality of planar receptacle surfaces. Further, the driveshaft assembly includes a torque transfer assembly (185) including a plurality of torque transfer keys (190) each with a planar key surface (194) and a convex key surface (196), and an adapter (200) including a plurality of concave adapter surfaces (212) and a plurality of planar adapter surfaces. The engagement surface of the each recess engages the planar key surface of one of the keys. The convex key surface of each key engages one of the concave adapter surfaces. Each of the planar adapter surfaces of the adapter engage with one of the receptacle surfaces.


The present invention relates to an offshore pipe system comprising a first unbonded flexible pipe and a second unbonded flexible pipe for transportation of fluids such as oil or gas. Each of the unbonded flexible pipes comprises a sealing sheath and an electrically conductive armor layer, and, moreover, the system comprises a first end fitting connected to the first end of the first unbonded flexible pipe and a second end fitting connected to the first end of the second unbonded flexible pipe. In the offshore pipe system the electrically conductive armor layer of the first unbonded flexible pipe is electrically connected with the electrically conductive armor layer of the second unbonded flexible pipe via a first electrical connection and a second electrical connection. To obtain an electrical circuit the the first and second electrical connections are applied with a distance along the length of the first unbonded flexible pipe and the second unbonded flexible pipe, respectively. The invention also relates to a method for heating pipes by forming an electrical circuit between the pipes.


Patent
National Oilwell Varco | Date: 2017-02-08

An instrumented shell for sensing drilling parameters of a drilling assembly positionable at a wellsite is provided. The drilling assembly includes a top drive assembly and a downhole tool. The instrumented shell includes a shell body, instruments and an interconnector. The shell body is positionable about the top drive assembly, and has pockets extending therein and a cover positionable about the shell body. The instruments include sensors, and are removably disposable in the pocket and sealable therein with the at least one cover. The interconnector includes a top drive connector removably connectable to the top drive assembly and a shell connector removably connectable to the shell body with a cable therebetween to pass signals therebetween whereby drilling parameters of the downhole tool may be directly collected.


A blowout preventer (116) and seal assembly for sealing a wellbore penetrating a subsurface formation is provided. The blowout preventer includes a housing having a flow path (251) therethrough in fluid communication with the wellbore and a sealing assembly (122) positionable in the housing about the flow path. The sealing assembly includes a piston (231) slidably positionable in the housing and a packer element (233). The packer element includes a plurality of fingers (260) and a packer seal (262). The fingers include a housing portion (266) and a piston portion (264). The housing portion is slidably movable along the housing and the piston portion is slidingly movable along the piston. The fingers are engageable by the piston and movable to a sealed position about the flow path whereby the packer seal is energized to form a seal about the blowout preventer.

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