Patents by Inventor Rashobh Rajan Sobhana
Rashobh Rajan Sobhana 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: 11802479Abstract: A telemetry system includes a downhole device configured to generate modulated pressure pulses in drilling fluid within a drill string, first and second transducers configured provide first and second telemetry signals, respectively, responsive to pressure variations in the drilling fluid, and a telemetry computer coupled to the transducers. The telemetry computer includes a processor and a memory coupled to the processor. The memory contains instructions that, when executed by the processor, cause the telemetry computer to be configured to transform the first and second telemetry signals to a time-frequency domain representation to provide first and second time-frequency telemetry signals, respectively; and apply an unmixing filter to the first and second time-frequency telemetry signals to provide an enhanced signal in the time-frequency domain. The enhanced signal has a source signal component separated from a noise component, and the first and second telemetry signals are mixed source-noise signals.Type: GrantFiled: January 26, 2022Date of Patent: October 31, 2023Assignee: Halliburton Energy Services, Inc.Inventor: Rashobh Rajan Sobhana
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Publication number: 20230258076Abstract: A telemetry system includes a downhole device configured to generate modulated pressure pulses in drilling fluid within a drill string, first and second transducers configured provide first and second telemetry signals, respectively, responsive to pressure variations in the drilling fluid, and a telemetry computer coupled to the transducers. The telemetry computer includes a processor and a memory coupled to the processor. The memory contains instructions that, when executed by the processor, cause the telemetry computer to be configured to transform the first and second telemetry signals to a time-frequency domain representation to provide first and second time-frequency telemetry signals, respectively; and apply an unmixing filter to the first and second time-frequency telemetry signals to provide an enhanced signal in the time-frequency domain. The enhanced signal has a source signal component separated from a noise component, and the first and second telemetry signals are mixed source-noise signals.Type: ApplicationFiled: January 26, 2022Publication date: August 17, 2023Inventor: Rashobh Rajan SOBHANA
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Patent number: 11634982Abstract: Systems and methods for adaptive filtering of RSS pad noise and the detection of RSS pad seal leakage in real-time.Type: GrantFiled: March 23, 2021Date of Patent: April 25, 2023Assignee: HALLIBURTON ENERGY SERVICES, INC.Inventors: Lizheng Zhang, Paravastu Badrinarayanan, Malay Mehta, Rashobh Rajan Sobhana, Felipe Costa Oliveira Chagas
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Patent number: 11578586Abstract: A method may comprise measuring during a survey operation a gravitational field data using a survey accelerometer and magnetic field data using a survey magnetometer and determining during a drilling operation an azimuth of a wellbore based on the gravitational field data and the magnetic field data obtained during the survey operation. A system may comprise a drilling rig; a pipe string attached to the drilling rig; a bottom hole assembly attached to the pipe string, wherein the bottom hole assembly comprises at least one sensor; a drill bit, wherein the at least one sensor measure a revolutions-per-minute (RPM) of the drill bit; and a computing subsystem.Type: GrantFiled: November 29, 2018Date of Patent: February 14, 2023Assignee: Halliburton Energy Services, Inc.Inventor: Rashobh Rajan Sobhana
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Publication number: 20220235650Abstract: Systems and methods for adaptive filtering of RSS pad noise and the detection of RSS pad seal leakage in real-time.Type: ApplicationFiled: March 23, 2021Publication date: July 28, 2022Inventors: Lizheng Zhang, Paravastu Badrinarayanan, Malay Mehta, Rashobh Rajan Sobhana, Felipe Costa Oliveira Chagas
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Patent number: 11255179Abstract: A method may comprise obtaining, during drilling operations within a wellbore, two-dimensional accelerometer data with an accelerometer on a rotating downhole tool, determining a radial offset of the accelerometer based on the two-dimensional accelerometer data, and determining a centripetal acceleration of the accelerometer based on the two-dimensional accelerometer data. A system may comprise one or more x-axis accelerometers disposed on a bottom hole assembly, one or more y-axis accelerometers disposed on the bottom hole assembly, an analog to digital converter, wherein the analog to digital converter converts an analog signal from the one or more x-axis accelerometers and the one or more y-axis accelerometers to a digital signal, and a computing subsystem.Type: GrantFiled: November 29, 2018Date of Patent: February 22, 2022Assignee: Halliburton Energy Services, Inc.Inventor: Rashobh Rajan Sobhana
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Patent number: 10865634Abstract: A method may comprise penetrating a subterranean formation with a bottom hole assembly, determining a revolutions-per-minute (RPM) measurement based on a zero crossing of sinusoidal magnetometer data, determining a gyroscope bias from gyroscope data using the determined RPM measurement, determining bias compensated gyroscope data by subtracting the determined gyroscope bias from the gyroscope data, determining an angular displacement measurement using the bias compensated gyroscope data, determining a selected tool-face measurement, computing a weighted sum of the selected tool-face measurement with the determined bias compensated gyroscope data, and determining a gravitational tool-face measurement from the computed weighted sum. A system may comprise a drilling rig, a pipe string attached to the drilling rig, a bottom hole assembly attached to the pipe string, wherein the bottom hole assembly comprises at least one sensor, a drill bit, and a computing subsystem connected to the at least one sensor.Type: GrantFiled: November 29, 2018Date of Patent: December 15, 2020Assignee: Halliburton Energy Services, Inc.Inventor: Rashobh Rajan Sobhana
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Publication number: 20200300078Abstract: A method may comprise penetrating a subterranean formation with a bottom hole assembly, determining a revolutions-per-minute (RPM) measurement based on a zero crossing of sinusoidal magnetometer data, determining a gyroscope bias from gyroscope data using the determined RPM measurement, determining bias compensated gyroscope data by subtracting the determined gyroscope bias from the gyroscope data, determining an angular displacement measurement using the bias compensated gyroscope data, determining a selected tool-face measurement, computing a weighted sum of the selected tool-face measurement with the determined bias compensated gyroscope data, and determining a gravitational tool-face measurement from the computed weighted sum. A system may comprise a drilling rig, a pipe string attached to the drilling rig, a bottom hole assembly attached to the pipe string, wherein the bottom hole assembly comprises at least one sensor, a drill bit, and a computing subsystem connected to the at least one sensor.Type: ApplicationFiled: November 29, 2018Publication date: September 24, 2020Applicant: Halliburton Energy Services, Inc.Inventor: Rashobh Rajan Sobhana
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Publication number: 20200300076Abstract: A method may comprise obtaining, during drilling operations within a wellbore, two-dimensional accelerometer data with an accelerometer on a rotating downhole tool, determining a radial offset of the accelerometer based on the two-dimensional accelerometer data, and determining a centripetal acceleration of the accelerometer based on the two-dimensional accelerometer data. A system may comprise one or more x-axis accelerometers disposed on a bottom hole assembly, one or more y-axis accelerometers disposed on the bottom hole assembly, an analog to digital converter, wherein the analog to digital converter converts an analog signal from the one or more x-axis accelerometers and the one or more y-axis accelerometers to a digital signal, and a computing subsystem.Type: ApplicationFiled: November 29, 2018Publication date: September 24, 2020Applicant: Halliburton Energy Services, Inc.Inventor: Rashobh Rajan Sobhana
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Publication number: 20200270980Abstract: A method may comprise measuring during a survey operation a gravitational field data using a survey accelerometer and magnetic field data using a survey magnetometer and determining during a drilling operation an azimuth of a wellbore based on the gravitational field data and the magnetic field data obtained during the survey operation. A system may comprise a drilling rig; a pipe string attached to the drilling rig; a bottom hole assembly attached to the pipe string, wherein the bottom hole assembly comprises at least one sensor; a drill bit, wherein the at least one sensor measure a revolutions-per-minute (RPM) of the drill bit; and a computing subsystem.Type: ApplicationFiled: November 29, 2018Publication date: August 27, 2020Applicant: Halliburton Energy Services, Inc.Inventor: Rashobh Rajan Sobhana