Patents by Inventor Satish Rajagopalan
Satish Rajagopalan 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: 11624275Abstract: The disclosed embodiments include a rotating survey tool. The rotating survey tool includes a first sensor array that in operation collects a first set of survey measurements during a downhole drilling operation. Additionally, the rotating survey tool includes a second sensor array directly coupled to the first sensor array that in operation collects a second set of survey measurements while a drill bit drills during the downhole drilling operation. Further, the second set of survey measurements has a greater base accuracy than the first set of survey measurements.Type: GrantFiled: February 25, 2021Date of Patent: April 11, 2023Assignee: HALLIBURTON ENERGY SERVICES, INC.Inventors: Jonathan Peter Zacharko, Satish Rajagopalan
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Patent number: 11585189Abstract: A system for and method of use with a downhole tool that includes a tubular with a fluid flow path therethrough for flowing a fluid and a housing coupleable to a downhole portion of the tubular. A fluid-driven motor assembly is included and has a drive shaft rotatable to output rotational drive forces. An electric generator is coupled to the drive shaft to convert the rotational drive forces into electrical power. There is also an electric motor electrically coupled to the electric generator to convert electrical output of the electric generator into a rotational drive force to control the downhole tool. A controller is electrically coupled to the electric motor and the electric generator to conduct electrical power output from the electric motor to the electric generator and dissipate excess energy produced by the electric motor to the fluid-driven motor assembly as hydraulic energy.Type: GrantFiled: December 26, 2018Date of Patent: February 21, 2023Assignee: Halliburton Energy Services, Inc.Inventors: Satish Rajagopalan, Heiko Schmirgel, Richard Hay
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Patent number: 11133664Abstract: An example method may include generating an alternating current (AC) output at a power source within a borehole in a subterranean formation. An electrical component may receive a direct current (DC) output from a converter circuit coupled to the power source and the electrical component. One or more measurements corresponding to the power source, the converter circuit, the electrical component, or a protection circuit coupled to the converter circuit may be received. Blocking devices within the protection circuit may be selectively caused to block current flow in the converter circuit based, at least in part, on the one or more received measurements.Type: GrantFiled: January 22, 2016Date of Patent: September 28, 2021Assignee: Halliburton Energy Services, Inc.Inventors: Satish Rajagopalan, Jonathan Peter Zacharko
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Publication number: 20210277748Abstract: A system for and method of use with a downhole tool that includes a tubular with a fluid flow path therethrough for flowing a fluid and a housing coupleable to a downhole portion of the tubular. A fluid-driven motor assembly is included and has a drive shaft rotatable to output rotational drive forces. An electric generator is coupled to the drive shaft to convert the rotational drive forces into electrical power. There is also an electric motor electrically coupled to the electric generator to convert electrical output of the electric generator into a rotational drive force to control the downhole tool. A controller is electrically coupled to the electric motor and the electric generator to conduct electrical power output from the electric motor to the electric generator and dissipate excess energy produced by the electric motor to the fluid-driven motor assembly as hydraulic energy.Type: ApplicationFiled: December 26, 2018Publication date: September 9, 2021Applicant: Halliburton Energy Services, Inc.Inventors: Satish Rajagopalan, Heiko Schmirgel, Rick Hay
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Publication number: 20210180441Abstract: The disclosed embodiments include a rotating survey tool. The rotating survey tool includes a first sensor array that in operation collects a first set of survey measurements during a downhole drilling operation. Additionally, the rotating survey tool includes a second sensor array directly coupled to the first sensor array that in operation collects a second set of survey measurements while a drill bit drills during the downhole drilling operation. Further, the second set of survey measurements has a greater base accuracy than the first set of survey measurements.Type: ApplicationFiled: February 25, 2021Publication date: June 17, 2021Inventors: Jonathan Peter ZACHARKO, Satish RAJAGOPALAN
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Patent number: 10972028Abstract: A power generation system for a drilling tool includes a turbine, an alternator, a converter and a first active rectifier control (ARC). The turbine is adapted to be driven by a fluid flow in a well. The alternator is coupled to the turbine and generates an alternative current (AC). The converter converts the AC to direct current (DC) and carries out active rectification. The first active rectifier control (ARC) controls the active rectification of the converter.Type: GrantFiled: August 6, 2019Date of Patent: April 6, 2021Assignee: HALLIBURTON ENERGY SERVICES, INC.Inventor: Satish Rajagopalan
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Patent number: 10961838Abstract: The disclosed embodiments include a rotating survey tool. The rotating survey tool includes a first sensor array that in operation collects a first set of survey measurements during a downhole drilling operation. Additionally, the rotating survey tool includes a second sensor array directly coupled to the first sensor array that in operation collects a second set of survey measurements while a drill bit drills during the downhole drilling operation. Further, the second set of survey measurements has a greater base accuracy than the first set of survey measurements.Type: GrantFiled: December 15, 2016Date of Patent: March 30, 2021Assignee: HALLIBURTON ENERGY SERVICES, INC.Inventors: Jonathan Peter Zacharko, Satish Rajagopalan
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Patent number: 10914120Abstract: A Rotary Steerable System (RSS) includes a flexible collar coupled therein that reduces the stiffness of the RSS and permits a tighter turning radius to be achieved. The positioning of the flexible collar between the steering section and the controller of the RSS further improves the turning radius, and may permit a push-the-bit system to operate similar to a point-the bit system. The flexible collar permits communication therethrough between controller and the steering sections of the RSS. The RSS may be arranged as a modular system to receive various configurations of a flexible collar and may operate with no flexible collar installed. The modularity enables tuning of the stiffness of an RSS to achieve different steering objectives.Type: GrantFiled: October 17, 2017Date of Patent: February 9, 2021Assignee: HALLIBURTON ENERGY SERVICES, INC.Inventors: Christian Menger, Satish Rajagopalan, Daniel Winslow
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Patent number: 10808503Abstract: The disclosed embodiments include a method to protect a downhole generator from overvoltage. In one embodiment, the method includes determining a speed of an alternator. The method also includes activating overvoltage protection mode if the speed of the alternator is greater than a threshold speed, where activating the overvoltage protection mode includes converting an alternating current measured at the alternator into a first component and a second component of a direct current. Activating the overvoltage protection mode also includes determining a first current threshold based on at least one component of the downhole generator. Activating the overvoltage protection mode also includes shutting down the downhole generator if the first component of the direct current is greater than the first current threshold and decreasing a magnetic flux of the downhole generator if the first component of the direct current is not greater than the first current threshold.Type: GrantFiled: May 4, 2016Date of Patent: October 20, 2020Assignee: Halliburton Energy Services, Inc.Inventors: Satish Rajagopalan, Jaya Deepti Dasika
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Publication number: 20200003042Abstract: The disclosed embodiments include a rotating survey tool. The rotating survey tool includes a first sensor array that in operation collects a first set of survey measurements during a downhole drilling operation. Additionally, the rotating survey tool includes a second sensor array directly coupled to the first sensor array that in operation collects a second set of survey measurements while a drill bit drills during the downhole drilling operation. Further, the second set of survey measurements has a greater base accuracy than the first set of survey measurements.Type: ApplicationFiled: December 12, 2016Publication date: January 2, 2020Inventors: Jonathan ZACHARKO, Satish RAJAGOPALAN
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Publication number: 20190363655Abstract: A power generation system for a drilling tool includes a turbine, an alternator, a converter and a first active rectifier control (ARC). The turbine is adapted to be driven by a fluid flow in a well. The alternator is coupled to the turbine and generates an alternative current (AC). The converter converts the AC to direct current (DC) and carries out active rectification. The first active rectifier control (ARC) controls the active rectification of the converter.Type: ApplicationFiled: August 6, 2019Publication date: November 28, 2019Applicant: Halliburton Energy Services, Inc.Inventor: Satish Rajagopalan
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Patent number: 10411626Abstract: A power generation system for a drilling tool includes a turbine, an alternator, a converter and a first active rectifier control (ARC). The turbine is adapted to be driven by a fluid flow in a well. The alternator is coupled to the turbine and generates an alternative current (AC). The converter converts the AC to direct current (DC) and carries out active rectification. The first active rectifier control (ARC) controls the active rectification of the converter.Type: GrantFiled: October 13, 2016Date of Patent: September 10, 2019Assignee: Halliburton Energy Services, Inc.Inventor: Satish Rajagopalan
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Patent number: 10408020Abstract: An example downhole power generation apparatus may include a turbine and a drive shaft coupled to the turbine. A plurality of alternators may be coupled to the drive shaft and electrically connected in parallel. When the drive shaft rotates, the plurality of alternators may generate phase-offset alternating current (AC) power signals. AC-to-direct current (DC) conversion circuitry may be coupled to the plurality of alternators.Type: GrantFiled: December 30, 2015Date of Patent: September 10, 2019Assignee: Halliburton Energy Services, Inc.Inventors: Satish Rajagopalan, Hugh Douglas
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Publication number: 20190234148Abstract: A Rotary Steerable System (RSS) includes a flexible collar coupled therein that reduces the stiffness of the RSS and permits a tighter turning radius to be achieved. The positioning of the flexible collar between the steering section and the controller of the RSS further improves the turning radius, and may permit a push-the-bit system to operate similar to a point-the bit system. The flexible collar permits communication therethrough between controller and the steering sections of the RSS. The RSS may be arranged as a modular system to receive various configurations of a flexible collar and may operate with no flexible collar installed. The modularity enables tuning of the stiffness of an RSS to achieve different steering objectives.Type: ApplicationFiled: October 17, 2017Publication date: August 1, 2019Inventors: Christian Menger, Satish Rajagopalan, Daniel Winslow
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Publication number: 20190048690Abstract: The disclosed embodiments include a method to protect a downhole generator from overvoltage. In one embodiment, the method includes determining a speed of an alternator. The method also includes activating overvoltage protection mode if the speed of the alternator is greater than a threshold speed, where activating the overvoltage protection mode includes converting an alternating current measured at the alternator into a first component and a second component of a direct current. Activating the overvoltage protection mode also includes determining a first current threshold based on at least one component of the downhole generator. Activating the overvoltage protection mode also includes shutting down the downhole generator if the first component of the direct current is greater than the first current threshold and decreasing a magnetic flux of the downhole generator if the first component of the direct current is not greater than the first current threshold.Type: ApplicationFiled: May 4, 2016Publication date: February 14, 2019Inventors: Satish RAJAGOPALAN, Jaya Deepti DASIKA
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Publication number: 20190024484Abstract: A system and method for powering a bottom hole assembly. A system may comprise a turbine and an alternator, in which the turbine is connected to the alternator. An AC-DC converter wherein the AC-DC converter is connected to the alternator. A subbus, configured to supply the DC current along the subbus to power the bottom hole assembly. An ultracapacitor and a bidirectional DC-DC converter. The method may comprise introducing a bottom hole assembly into a wellbore, pumping a drilling fluid into the wellbore, and activating a turbine of the bottom hole assembly with the drilling fluid such that power is generated to power one or more components of the bottom hole assembly and charge an ultracapacitor of the bottom hole assembly. Activating the ultracapacitor and powering the bottom hole assembly with the ultracapacitor during a period that the turbine is not activated with the drilling fluid.Type: ApplicationFiled: November 30, 2016Publication date: January 24, 2019Applicant: Halliburton Energy Services, Inc.Inventors: Satish Rajagopalan, Clint P. Lozinsky
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Publication number: 20180351349Abstract: An example method may include generating an alternating current (AC) output at a power source within a borehole in a subterranean formation. An electrical component may receive a direct current (DC) output from a converter circuit coupled to the power source and the electrical component. One or more measurements corresponding to the power source, the converter circuit, the electrical component, or a protection circuit coupled to the converter circuit may be received. Blocking devices within the protection circuit may be selectively caused to block current flow in the converter circuit based, at least in part, on the one or more received measurements.Type: ApplicationFiled: January 22, 2016Publication date: December 6, 2018Applicant: Halliburton Energy Services, Inc.Inventors: Satish Rajagopalan, Jonathan Peter Zacharko
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Publication number: 20180320482Abstract: The present disclosure relates to a magnetic coupling of a downhole tool that includes a first annular array of magnetic sections, a second annular array of magnetic sections coupled to the first annular array by a magnetic field that transfers rotational motion from the first annular array to the second annular array, and a barrier disposed between the first annular array and the second annular array, the barrier including an erosion-resistant layer. The present disclosure also relates to a method of bootstrapping a magnetic coupling of a downhole tool. The method includes supplying electrical current from a battery to an electromagnetic coil in the magnetic coupling, transferring rotational motion from the magnetic coupling to an alternating current (AC) source and supplying electrical current from the AC source to the electromagnetic coil.Type: ApplicationFiled: December 4, 2015Publication date: November 8, 2018Inventors: Mukul M. Agnihotri, Satish Rajagopalan
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Publication number: 20180287533Abstract: A power generation system for a drilling tool includes a turbine, an alternator, a converter and a first active rectifier control (ARC). The turbine is adapted to be driven by a fluid flow in a well. The alternator is coupled to the turbine and generates an alternative current (AC). The converter converts the AC to direct current (DC) and carries out active rectification. The first active rectifier control (ARC) controls the active rectification of the converter.Type: ApplicationFiled: October 13, 2016Publication date: October 4, 2018Inventor: Satish RAJAGOPALAN
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Publication number: 20180223632Abstract: An example downhole power generation apparatus may include a turbine and a drive shaft coupled to the turbine. A plurality of alternators may be coupled to the drive shaft and electrically connected in parallel. When the drive shaft rotates, the plurality of alternators may generate phase-offset alternating current (AC) power signals. AC-to-direct current (DC) conversion circuitry may be coupled to the plurality of alternators.Type: ApplicationFiled: December 30, 2015Publication date: August 9, 2018Inventors: Satish Rajagopalan, Hugh Douglas