Patents by Inventor Khoi Trinh
Khoi Trinh 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: 11905777Abstract: An agitator deployable in a wellbore includes a housing including a central axis and a central passage, a valve including a first valve body having a first contact face and a second valve body permitted to rotate relative to the first valve body and having a second contact face configured to contact the first contact face, a first valve adapter including a first receptacle which receives at least a portion of the first valve body to couple the first valve adapter to the first valve body, and a flexible valve configured to permit the first valve body to flex relative to the first valve adapter whereby an angular misalignment may form between a central axis of the first valve body and a central axis of the first valve adapter.Type: GrantFiled: June 10, 2022Date of Patent: February 20, 2024Assignee: National Oilwell Varco, L.P.Inventors: Khoi Trinh, Russell Gilleylen
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Patent number: 11867015Abstract: A friction reduction system includes a housing including a central axis and a central passage, a valve disposed in the housing and including a first valve body and a second valve body wherein the first valve body is permitted to rotate relative to the second valve body, and a mandrel coupled to the second valve body and permitted to travel axially relative to the housing, wherein a first net pressure force is applied against the mandrel that corresponds to a drilling fluid pressure of a drilling fluid in response to flowing the drilling fluid through the valve and transitioning the valve from a closed configuration to an open configuration, and wherein a second net pressure force is applied against the mandrel that corresponds to a wellbore fluid pressure in response to flowing the drilling fluid through the valve and transitioning the valve from the open configuration to the closed configuration.Type: GrantFiled: March 4, 2022Date of Patent: January 9, 2024Assignee: National Oilwell Varco, L.P.Inventors: Khoi Trinh, Yufang Xia
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Publication number: 20230399911Abstract: An agitator deployable in a wellbore includes a housing including a central axis and a central passage, a valve including a first valve body having a first contact face and a second valve body permitted to rotate relative to the first valve body and having a second contact face configured to contact the first contact face, a first valve adapter including a first receptacle which receives at least a portion of the first valve body to couple the first valve adapter to the first valve body, and a flexible valve configured to permit the first valve body to flex relative to the first valve adapter whereby an angular misalignment may form between a central axis of the first valve body and a central axis of the first valve adapter.Type: ApplicationFiled: June 10, 2022Publication date: December 14, 2023Applicant: National Oilwell Varco, L.P.Inventors: Khoi Trinh, Russell Gilleylen
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Publication number: 20220282588Abstract: A friction reduction system includes a housing including a central axis and a central passage, a valve disposed in the housing and including a first valve body and a second valve body wherein the first valve body is permitted to rotate relative to the second valve body, and a mandrel coupled to the second valve body and permitted to travel axially relative to the housing, wherein a first net pressure force is applied against the mandrel that corresponds to a drilling fluid pressure of a drilling fluid in response to flowing the drilling fluid through the valve and transitioning the valve from a closed configuration to an open configuration, and wherein a second net pressure force is applied against the mandrel that corresponds to a wellbore fluid pressure in response to flowing the drilling fluid through the valve and transitioning the valve from the open configuration to the closed configuration.Type: ApplicationFiled: March 4, 2022Publication date: September 8, 2022Applicant: National Oilwell Varco, L.P.Inventors: Khoi Trinh, Yufang Xia
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Publication number: 20220275685Abstract: Embodiments disclosed herein are directed to a flow pulsing system including a rotor, a stator, a dart which is configured to releasably couple with the rotor, and a nozzle releasably coupled to the rotor which is configured to control a fluid flow through the rotor. In some embodiments, the system uses a screen disposed therein which includes an inner bore in fluid communication with a plurality of lobe cavities along the rotor. In some embodiments, the system uses a stationary valve and an oscillating valve having a plurality of oscillating valve ports which are in fluid communication with the plurality of lobe cavities.Type: ApplicationFiled: July 21, 2020Publication date: September 1, 2022Applicant: NATIONAL OILWELL DHT, L.P.Inventors: Khoi Trinh, Steve Bhagwandin, Yufang Xia, Ian Forster
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Patent number: 9540896Abstract: A coring assembly comprises an outer barrel coupled to a coring bit. An inner barrel is disposed within the outer barrel. An inner sleeve is disposed within the inner barrel and includes at least one frangible region that allows the inner sleeve to break so that coring operations can continue after the occurrence of a core jam.Type: GrantFiled: April 1, 2014Date of Patent: January 10, 2017Assignee: National Oilwell Varco, L.P.Inventors: Alan Grant Norrie, Khoi Trinh, Rahul Patel
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Patent number: 9494004Abstract: A coring extender for a coring tool is provided. The coring tool is deployable by a downhole tool into a wellbore. The coring extender includes a housing operatively connectable to the downhole tool, a mandrel, and seals. The housing has fluid chambers therein. The mandrel is positionable in the housing, and includes a locking tube operatively connectable to the housing and a coupling tube operatively connectable to the coring tool. The coupling tube is adjustably positionable relative to the locking tube such that a length of the mandrel is adjustably defined therebetween. The coupling tube has an outer surface slidably positionable along an inner surface of the housing. Seals are positionable between the mandrel and the housing to define a fluid pocket to isolate the fluid therebetween as the coupling tube moves along the housing whereby the fluid permitted to flow about the fluid pocket to balance between the fluid chambers.Type: GrantFiled: December 20, 2013Date of Patent: November 15, 2016Assignee: NATIONAL OILWELL VARCO, L.P.Inventors: Khoi Trinh, Folarin Ozah, Rick N. Mecham
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Patent number: 9435168Abstract: A downhole activation assembly for activating a downhole component of a downhole tool positionable in a wellbore penetrating a subterranean formation. The activation assembly includes a housing operatively connectable to the downhole tool, a spring-loaded sleeve, and a ball catcher. The sleeve slidably positionable in the housing, and having a flow channel therethrough and an outer surface defining a chamber between the sleeve and the housing. The sleeve having inlets therethrough about a sleeve end thereof to permit fluid from the flow channel to pass therethrough. The ball catcher slidably positionable in the housing, and having a catcher end engageable with the sleeve end to selectively divert the fluid thereabout and a ball seat therein to receivingly engage a ball passing through the sleeve whereby the ball catcher selectively moves the downhole component between activation positions.Type: GrantFiled: January 27, 2014Date of Patent: September 6, 2016Assignee: National Oilwell DHT, L.P.Inventor: Khoi Trinh
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Publication number: 20150275604Abstract: A coring assembly comprises an outer barrel coupled to a coring bit. An inner barrel is disposed within the outer barrel. An inner sleeve is disposed within the inner barrel and includes at least one frangible region that allows the inner sleeve to break so that coring operations can continue after the occurrence of a core jam.Type: ApplicationFiled: April 1, 2014Publication date: October 1, 2015Applicant: National Oilwell Varco, L.P.Inventors: Alan Grant NORRIE, Khoi TRINH, Rahul PATEL
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Publication number: 20150176355Abstract: A coring extender for a coring tool is provided. The coring tool is deployable by a downhole tool into a wellbore. The coring extender includes a housing operatively connectable to the downhole tool, a mandrel, and seals. The housing has fluid chambers therein. The mandrel is positionable in the housing, and includes a locking tube operatively connectable to the housing and a coupling tube operatively connectable to the coring tool. The coupling tube is adjustably positionable relative to the locking tube such that a length of the mandrel is adjustably defined therebetween. The coupling tube has an outer surface slidably positionable along an inner surface of the housing. Seals are positionable between the mandrel and the housing to define a fluid pocket to isolate the fluid therebetween as the coupling tube moves along the housing whereby the fluid permitted to flow about the fluid pocket to balance between the fluid chambers.Type: ApplicationFiled: December 20, 2013Publication date: June 25, 2015Applicant: National Oilwell Varco, L.P.Inventors: Khoi Trinh, Folarin Ozah, Rick N. Mecham
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Publication number: 20140216761Abstract: A downhole activation assembly for activating a downhole component of a downhole tool positionable in a wellbore penetrating a subterranean formation. The activation assembly includes a housing operatively connectable to the downhole tool, a spring-loaded sleeve, and a ball catcher. The sleeve slidably positionable in the housing, and having a flow channel therethrough and an outer surface defining a chamber between the sleeve and the housing. The sleeve having inlets therethrough about a sleeve end thereof to permit fluid from the flow channel to pass therethrough. The ball catcher slidably positionable in the housing, and having a catcher end engageable with the sleeve end to selectively divert the fluid thereabout and a ball seat therein to receivingly engage a ball passing through the sleeve whereby the ball catcher selectively moves the downhole component between activation positions.Type: ApplicationFiled: January 27, 2014Publication date: August 7, 2014Applicant: National Oilwell DHT, L.P.Inventor: Khoi Trinh
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Patent number: 8074747Abstract: Stabilizer assemblies and tools incorporating same may comprise a body having at least one bearing pad receptacle therein, and a bearing pad disposed in the receptacle. The bearing pad includes at least two separated bores extending transversely therethrough, the bores being aligned with transversely extending bores in the body on laterally opposite sides of the bearing pad receptacle. A lock rod extends through each bearing pad bore and into the associated body bores.Type: GrantFiled: February 20, 2009Date of Patent: December 13, 2011Assignee: Baker Hughes IncorporatedInventors: Steven R. Radford, Kevin G. Kidder, Khoi Trinh
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Publication number: 20100212969Abstract: Stabilizer assemblies and tools incorporating same are disclosed. In one embodiment, a stabilizer assembly comprises a body having at least one bearing pad receptacle therein, and a bearing pad disposed in the receptacle. The bearing pad includes at least two separated bores extending transversely therethrough, the bores being aligned with transversely extending bores in the body on laterally opposite sides of the bearing pad receptacle. A lock rod extends through each bearing pad bore and into the associated body bores.Type: ApplicationFiled: February 20, 2009Publication date: August 26, 2010Inventors: Steven R. Radford, Kevin G. Kidder, Khoi Trinh