Patents by Inventor Pal Jacob Nessjoen
Pal Jacob Nessjoen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10533407Abstract: A method and apparatus for estimating the instantaneous rotational speed of a bottom hole assembly at the lower end of a drill string. In one embodiment, a method includes driving the drill string by a drilling mechanism at the upper end of the drill string. A fundamental frequency of stick-slip oscillations suffered by the drill string is estimated. Variations in a drive torque of the drilling mechanism are determined. Known torsional compliance of the drill string is combined with the variations in the drive torque. An output signal representing the instantaneous rotational speed is provided.Type: GrantFiled: December 14, 2017Date of Patent: January 14, 2020Assignee: National Oilwell Varco, L.P.Inventors: Pal Jacob Nessjoen, Age Kyllingstad
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Publication number: 20180171773Abstract: A method and apparatus for estimating the instantaneous rotational speed of a bottom hole assembly at the lower end of a drill string. In one embodiment, a method includes driving the drill string by a drilling mechanism at the upper end of the drill string. A fundamental frequency of stick-slip oscillations suffered by the drill string is estimated. Variations in a drive torque of the drilling mechanism are determined. Known torsional compliance of the drill string is combined with the variations in the drive torque. An output signal representing the instantaneous rotational speed is provided.Type: ApplicationFiled: December 14, 2017Publication date: June 21, 2018Applicant: National Oilwell Varco, L.P.Inventors: Pal Jacob Nessjoen, Age Kyllingstad
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Patent number: 9885231Abstract: A method and apparatus for estimating the instantaneous rotational speed of a bottom hole assembly at the lower end of a drill string. In one embodiment, a method includes driving the drill string by a drilling mechanism at the upper end of the drill string. A fundamental frequency of stick-slip oscillations suffered by the drill string is estimated. Variations in a drive torque of the drilling mechanism are determined. Known torsional compliance of the drill string is combined with the variations in the drive torque. An output signal representing the instantaneous rotational speed is provided.Type: GrantFiled: January 5, 2015Date of Patent: February 6, 2018Assignee: NATIONAL OILWELL VARCO, L.P.Inventors: Pal Jacob Nessjoen, Age Kyllingstad
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Patent number: 9476417Abstract: A method for detecting and localizing a valve leak in a piston machine having a shaft includes: attaching one or more vibration sensor to a valve block of the piston machine; measuring the vibrations from at least one of the vibration sensors; attaching a sensor to the piston machine where the sensor is designed to produce, directly or indirectly, an angular shaft position signal for the shaft; determining, directly or indirectly, an angular shaft position signal for the shaft; transforming vibration signals from the one or more vibration sensors into one envelope signal representing an instant vibration level; using the angular position signal for constructing window functions that pick the envelope signal in selected angular shaft sectors; using the window functions to find sector based averages of the vibration level; and comparing said averages with a critical ambient vibration level to detect and localize leaks in one or two valves.Type: GrantFiled: November 18, 2011Date of Patent: October 25, 2016Assignee: NATIONAL OILWELL VARCO NORWAY ASInventors: Åge Kyllingstad, Pål Jacob Nessjøen
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Patent number: 9464492Abstract: A system is disclosed for determining the position of a downhole drill pipe relative to a pipe handling device. The system comprises: an imaging means arranged to capture an image of the drill pipe in a region of the pipe for engagement by the device; and a processor operable to analyze said captured image and to determine therefrom the position of the drill pipe relative to said device.Type: GrantFiled: April 28, 2011Date of Patent: October 11, 2016Assignee: NATIONAL OILWELL VARCO, L.P.Inventors: Arne Austefjord, Pal Jacob Nessjoen
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Patent number: 9303473Abstract: A crane control system for determining a suitable real-time operating regime for a crane arranged to lift cargo from a marine vessel, the system includes an imaging means associated with the crane, a processing means, and a memory means. The imaging means is arranged to capture images of the vessel when it is located generally below the crane and within the operational range of the crane. The processing means is operable to calculate from the captured images movement parameters characterizing the movement of the vessel relative to the crane. The memory contains performance data representative of the performance characteristics of the crane and cargo data representative of the weight of individual items of said cargo. The processing means is further configured to compare the calculated movement parameters to the performance data and the cargo data and to determine from said comparison a safe operating regime for the crane.Type: GrantFiled: April 28, 2011Date of Patent: April 5, 2016Assignee: NATIONAL OILWELL VARCO, L.P.Inventors: Arne Austefjord, Pal Jacob Nessjoen
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Publication number: 20150107897Abstract: A method and apparatus for estimating the instantaneous rotational speed of a bottom hole assembly at the lower end of a drill string. In one embodiment, a method includes driving the drill string by a drilling mechanism at the upper end of the drill string. A fundamental frequency of stick-slip oscillations suffered by the drill string is estimated. Variations in a drive torque of the drilling mechanism are determined. Known torsional compliance of the drill string is combined with the variations in the drive torque. An output signal representing the instantaneous rotational speed is provided.Type: ApplicationFiled: January 5, 2015Publication date: April 23, 2015Applicant: NATIONAL OILWELL VARCO, L.P.Inventors: Pal Jacob Nessjoen, Age Kyllingstad
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Patent number: 8950512Abstract: A method and apparatus for estimating the instantaneous rotational speed of a bottom hole assembly at the lower end of a drill string. In one embodiment, a method includes driving the drill string by a drilling mechanism at the upper end of the drill string. A fundamental frequency of stick-slip oscillations suffered by the drill string is estimated. Variations in a drive torque of the drilling mechanism are determined. Known torsional compliance of the drill string is combined with the variations in the drive torque. An output signal representing the instantaneous rotational speed is provided.Type: GrantFiled: September 16, 2013Date of Patent: February 10, 2015Assignee: National Oilwell Varco, L.P.Inventors: Pal Jacob Nessjoen, Age Kyllingstad
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Patent number: 8689906Abstract: A method and apparatus for estimating the instantaneous rotational speed of a bottom hole assembly at the lower end of a drill string. In one embodiment, a method includes driving the drill string by a drilling mechanism at the upper end of the drill string. A fundamental frequency of stick-slip oscillations suffered by the drill string is estimated. Variations in a drive torque of the drilling mechanism are determined. Known torsional compliance of the drill string is combined with the variations in the drive torque. An output signal representing the instantaneous rotational speed is provided.Type: GrantFiled: November 30, 2009Date of Patent: April 8, 2014Assignee: National Oilwell Varco, L.P.Inventors: Pal Jacob Nessjoen, Age Kyllingstad
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Publication number: 20140034386Abstract: A method and apparatus for estimating the instantaneous rotational speed of a bottom hole assembly at the lower end of a drill string. In one embodiment, a method includes driving the drill string by a drilling mechanism at the upper end of the drill string. A fundamental frequency of stick-slip oscillations suffered by the drill string is estimated. Variations in a drive torque of the drilling mechanism are determined. Known torsional compliance of the drill string is combined with the variations in the drive torque. An output signal representing the instantaneous rotational speed is provided.Type: ApplicationFiled: September 16, 2013Publication date: February 6, 2014Applicant: NATIONAL OILWELL VARCO, L.P.Inventors: Pal Jacob Nessjoen, Age Kyllingstad
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Publication number: 20130345878Abstract: A system is disclosed for determining the position of a downhole drill pipe relative to a pipe handling device. The system comprises: an imaging means arranged to capture an image of the drill pipe in a region of the pipe for engagement by the device; and a processor operable to analyse said captured image and to determine therefrom the position of the drill pipe relative to said device.Type: ApplicationFiled: April 28, 2011Publication date: December 26, 2013Applicant: NATIONAL OILWELL VARCO, L.P.Inventors: Arne Austefjord, Pal Jacob Nessjoen
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Publication number: 20130280106Abstract: A method for detecting and localizing a valve leak in a piston machine having a shaft includes: attaching one or more vibration sensor to a valve block of the piston machine; measuring the vibrations from at least one of the vibration sensors; attaching a sensor to the piston machine where the sensor is designed to produce, directly or indirectly, an angular shaft position signal for the shaft; determining, directly or indirectly, an angular shaft position signal for the shaft; transforming vibration signals from the one or more vibration sensors into one envelope signal representing an instant vibration level; using the angular position signal for constructing window functions that pick the envelope signal in selected angular shaft sectors; using the window functions to find sector based averages of the vibration level; and comparing said averages with a critical ambient vibration level to detect and localize leaks in one or two valves.Type: ApplicationFiled: November 18, 2011Publication date: October 24, 2013Applicant: NATIONAL OILWELL VARCO NORWAY ASInventors: Åge Kyllingstad, Pål Jacob Nessjøen
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Publication number: 20130120577Abstract: A crane control system for determining a suitable real-time operating regime for a crane arranged to lift cargo from a marine vessel, the system includes an imaging means associated with the crane, a processing means, and a memory means. The imaging means is arranged to capture images of the vessel when it is located generally below the crane and within the operational range of the crane. The processing means is operable to calculate from the captured images movement parameters characterising the movement of the vessel relative to the crane. The memory contains performance data representative of the performance characteristics of the crane and cargo data representative of the weight of individual items of said cargo. The processing means is further configured to compare the calculated movement parameters to the performance data and the cargo data and to determine from said comparison a safe operating regime for the crane.Type: ApplicationFiled: April 28, 2011Publication date: May 16, 2013Applicant: NATIONAL OILWELL VARCO, L.P.Inventors: Arne Austefjord, Pal Jacob Nessjoen
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Publication number: 20110245980Abstract: A method and apparatus for estimating the instantaneous rotational speed of a bottom hole assembly at the lower end of a drill string. In one embodiment, a method includes driving the drill string by a drilling mechanism at the upper end of the drill string. A fundamental frequency of stick-slip oscillations suffered by the drill string is estimated. Variations in a drive torque of the drilling mechanism are determined. Known torsional compliance of the drill string is combined with the variations in the drive torque. An output signal representing the instantaneous rotational speed is provided.Type: ApplicationFiled: November 30, 2009Publication date: October 6, 2011Applicant: National Oilwell Varco LPInventors: Pal Jacob Nessjoen, Age Kyllingstad