Patents by Inventor Pradyumna Thiruvenkatanathan

Pradyumna Thiruvenkatanathan 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).

  • Publication number: 20210115785
    Abstract: A method of determining fluid inflow locations comprises determining a plurality of temperature features from a distributed temperature sensing signal originating in a wellbore, using the plurality of temperature features in a fluid inflow identification model, and determining the presence of fluid inflow at one or more locations along the wellbore based on an output from the fluid inflow identification model.
    Type: Application
    Filed: October 15, 2020
    Publication date: April 22, 2021
    Inventors: Cagri CERRAHOGLU, James Crofton RAMSAY, Pradyumna THIRUVENKATANATHAN
  • Publication number: 20210115786
    Abstract: A method of determining fluid inflow rates within a wellbore comprises determining a plurality of temperature features from a distributed temperature sensing signal originating in a wellbore, determining one or more frequency domain features from an acoustic signal originating the wellbore, and using at least one temperature feature of the plurality of temperature features and at least one frequency domain feature of the one or more frequency domain features to determine a fluid inflow rate at one or more locations along the wellbore.
    Type: Application
    Filed: October 15, 2020
    Publication date: April 22, 2021
    Inventors: Cagri CERRAHOGLU, James Crofton RAMSAY, Pradyumna THIRUVENKATANATHAN
  • Patent number: 10975687
    Abstract: A method of detecting a leak event within a wellbore can include inducing a pressure differential within a wellbore comprising a fluid, obtaining a sample data set representative of the acoustic signal across a frequency spectrum while inducing the pressure differential, determining a plurality of frequency domain features of the sample data set, determining a presence of a leak event at one or more depths within the wellbore based on determining that the plurality of frequency domain features match a leak event signature, correlating the leak event with the induced pressure differential, and determining a presence and location of a leak within the wellbore based on the presence of the leak event and the correlating of the leak event with the induced pressure differential.
    Type: Grant
    Filed: September 10, 2019
    Date of Patent: April 13, 2021
    Assignee: BP EXPLORATION OPERATING COMPANY LIMITED
    Inventors: Tommy Langnes, Pradyumna Thiruvenkatanathan
  • Publication number: 20210087923
    Abstract: A method for determining an operating envelope for a wellbore includes receiving an indication of sand ingress into the wellbore from at least one production zone, sand transport along the wellbore, or both while producing one or more fluids from the wellbore from the at least one production zone, correlating a force on a production face of the at least one production zone of the wellbore with the sand ingress, the sand transport, or both, and determining an operating envelope based on the correlating. The operating envelope defines a boundary for the force on the production face of the at least one production zone of the wellbore during a production of the one or more fluids from the at least one production zone.
    Type: Application
    Filed: September 18, 2020
    Publication date: March 25, 2021
    Inventor: Pradyumna THIRUVENKATANATHAN
  • Publication number: 20210047916
    Abstract: A method of characterizing an inflow into a wellbore includes obtaining an acoustic signal from a sensor within the wellbore. In addition, the method includes determining a plurality of frequency domain features from the acoustic signal. Further, the method includes identifying at least one of a gas phase flow, an aqueous phase flow, or a hydrocarbon liquid phase flow using the plurality of the frequency domain features. The method also includes classifying a flow rate of the at least one of the gas phase flow, the aqueous phase flow, or the hydrocarbon liquid phase flow using the plurality of frequency domain features. The acoustic signal comprises acoustic samples across a portion of a depth of the wellbore.
    Type: Application
    Filed: August 13, 2020
    Publication date: February 18, 2021
    Applicant: BP Corporation North America, Inc.
    Inventors: Pradyumna THIRUVENKATANATHAN, Fei CAO
  • Publication number: 20200291772
    Abstract: A monitoring system, comprising a flow line comprising at least one bend, an optical fiber coupled to an exterior of the flow line, wherein the optical fiber is wrapped around at least a portion of the flow line, and a receiver coupled to an end of the optical fiber, wherein the receiver is configured to detect at least one acoustic signal from the optical fiber.
    Type: Application
    Filed: March 12, 2020
    Publication date: September 17, 2020
    Inventors: Pradyumna THIRUVENKATANATHAN, Tommy LANGNES
  • Publication number: 20200256834
    Abstract: A system for processing acoustic data to identify an event includes a receiver unit including a processor and a memory. The receiver unit is configured to receive a signal from a sensor disposed along a sensor path or across a sensor area. A processing application is stored in the memory. The processing application, when executed on the processor, configures the processor to: receive the signal from the sensor, where the signal includes an indication of an acoustic signal received at one or more lengths along the sensor path or across a portion of the sensor area and the signal is indicative of the acoustic signal across a frequency spectrum; determine a plurality of frequency domain features of the signal across the frequency spectrum; and generate an output comprising the plurality of frequency domain features.
    Type: Application
    Filed: October 10, 2018
    Publication date: August 13, 2020
    Applicant: BP Exploration Operating Company Limited
    Inventors: Tommy LANGNES, Pradyumna THIRUVENKATANATHAN
  • Publication number: 20200200000
    Abstract: A method of detecting sand ingress within a wellbore includes obtaining a sample data set, determining a plurality of frequency domain features of the sample data set over a plurality of depth ranges, determining a presence of sand ingress at a first depth range of the plurality of depth ranges within the wellbore based on determining that the plurality of frequency domain features over the first depth range match a sand ingress signature, and determining a presence of sand migration along a second depth range of the plurality of depths within the wellbore based on determining that the plurality of frequency domain features over the second depth range match a sand migration signature. The sample data set is a sample of an acoustic signal originating within a wellbore including a fluid. The sample data set is representative of the acoustic signal across a frequency spectrum.
    Type: Application
    Filed: August 23, 2018
    Publication date: June 25, 2020
    Applicant: BP Exploration Operating Company Limited
    Inventors: Tommy LANGNES, Pradyumna THIRUVENKATANATHAN
  • Publication number: 20200190971
    Abstract: A method of detecting an event by: obtaining a first sample data set; determining a frequency domain feature(s) of the first sample data set over a first time period; determining a first threshold for the a frequency domain feature(s) using the first sample data set: determining that the frequency domain feature(s) matches the first threshold; determining the presence of an event during the first time period based on determining that the frequency domain feature(s) matches the first threshold; obtaining a second sample data set; determining a frequency domain feature(s) of the second sample data set over a second time period; determining a second threshold for the frequency domain feature(s) using the second sample data set; determining that the frequency domain feature(s) matches the second threshold; and determining the presence of the event during the second time period based on determining that the frequency domain feature(s) matches the second threshold.
    Type: Application
    Filed: December 11, 2019
    Publication date: June 18, 2020
    Inventor: Pradyumna THIRUVENKATANATHAN
  • Publication number: 20200182047
    Abstract: A method of detecting sand inflow into a wellbore is disclosed. The method can include obtaining a sample data set, detecting a broadband signal within the sample data set, comparing the broadband signal with a signal reference, determining that the broadband signal meets or exceeds the signal reference, and determining the presence of sand inflow into the wellbore based on determining that the broadband signal meets or exceeds the signal reference. The sample data set can be a sample of an acoustic signal originating within a wellbore comprising a fluid, and the broadband signal at least includes a portion of the sample data set at frequencies above 0.5 kHz.
    Type: Application
    Filed: April 6, 2017
    Publication date: June 11, 2020
    Applicant: BP Exploration Operating Company Limited
    Inventors: Tommy LANGNES, Pradyumna THIRUVENKATANATHAN
  • Publication number: 20200174149
    Abstract: A method of identifying events includes obtaining an acoustic signal from a sensor, determining one or more frequency domain features from the acoustic signal, providing the one or more frequency domain features as inputs to a plurality of event detection models, and determining the presence of one or more events using the plurality of event detection models. The one or more frequency domain features are obtained across a frequency range of the acoustic signal, and at least two of the plurality of event detection models are different.
    Type: Application
    Filed: November 27, 2019
    Publication date: June 4, 2020
    Inventor: Pradyumna THIRUVENKATANATHAN
  • Publication number: 20200173273
    Abstract: A method of identifying inflow locations along a wellbore includes obtaining an acoustic signal from a sensor within the wellbore, determining a plurality of frequency domain features from the acoustic signal, and identifying, using a plurality of fluid flow models, a presence of at least one of a gas phase inflow, an aqueous phase inflow, or a hydrocarbon liquid phase inflow at one or more fluid flow locations. The acoustic signal includes acoustic samples across a portion of a depth of the wellbore, and the plurality of frequency domain features are obtained across a plurality of depth intervals within the portion of the depth of the wellbore. Each fluid flow model of the plurality of fluid inflow models uses one or more frequency domain features of the plurality of the frequency domain features, and at least two of the plurality of fluid flow models are different.
    Type: Application
    Filed: November 27, 2019
    Publication date: June 4, 2020
    Inventor: Pradyumna THIRUVENKATANATHAN
  • Publication number: 20200048999
    Abstract: A method of detecting a leak event within a wellbore can include inducing a pressure differential within a wellbore comprising a fluid, obtaining a sample data set representative of the acoustic signal across a frequency spectrum while inducing the pressure differential, determining a plurality of frequency domain features of the sample data set, determining a presence of a leak event at one or more depths within the wellbore based on determining that the plurality of frequency domain features match a leak event signature, correlating the leak event with the induced pressure differential, and determining a presence and location of a leak within the wellbore based on the presence of the leak event and the correlating of the leak event with the induced pressure differential.
    Type: Application
    Filed: September 10, 2019
    Publication date: February 13, 2020
    Inventors: Tommy LANGNES, Pradyumna THIRUVENKATANATHAN
  • Publication number: 20200032639
    Abstract: A method of detecting sand inflow into a wellbore is disclosed. The method can include obtaining a sample data set, detecting a broadband signal within the sample data set, comparing the broadband signal with a signal reference, determining that the broadband signal meets or exceeds the signal reference, and determining the presence of sand inflow into the wellbore based on determining that the broadband signal meets or exceeds the signal reference. The sample data set can be a sample of an acoustic signal originating within a wellbore comprising a fluid, and the broadband signal at least includes a portion of the sample data set at frequencies above 0.5 kHz.
    Type: Application
    Filed: September 6, 2019
    Publication date: January 30, 2020
    Applicant: BP Exploration Operating Company Limited
    Inventors: Tommy LANGNES, Pradyumna THIRUVENKATANATHAN
  • Publication number: 20190390546
    Abstract: A method of detecting an event within a wellbore includes obtaining a sample data set, determining a plurality of frequency domain features of the sample data set, comparing the plurality of frequency domain features with an event signature, determining that the plurality of frequency domain features matches the thresholds, ranges, or both of the event signature, and determining the presence of the event within the wellbore based on determining that the plurality of frequency domain features match the thresholds, ranges, or both of the event signature. The sample data set is a sample of an acoustic signal originating within a wellbore including a fluid. The sample data set is representative of the acoustic signal across a frequency spectrum. The event signature includes a plurality of thresholds, ranges, or both corresponding to the plurality of frequency domain features.
    Type: Application
    Filed: September 6, 2019
    Publication date: December 26, 2019
    Applicant: BP Exploration Operating Company Limited
    Inventors: Tommy LANGNES, Pradyumna THIRUVENKATANATHAN
  • Publication number: 20190120044
    Abstract: A method of detecting an event within a wellbore includes obtaining a sample data set, determining a plurality of frequency domain features of the sample data set, comparing the plurality of frequency domain features with an event signature, determining that the plurality of frequency domain features matches the thresholds, ranges, or both of the event signature, and determining the presence of the event within the wellbore based on determining that the plurality of frequency domain features match the thresholds, ranges, or both of the event signature. The sample data set is a sample of an acoustic signal originating within a wellbore including a fluid. The sample data set is representative of the acoustic signal across a frequency spectrum. The event signature includes a plurality of thresholds, ranges, or both corresponding to the plurality of frequency domain features.
    Type: Application
    Filed: April 6, 2017
    Publication date: April 25, 2019
    Applicant: BP Exploration Operating Company Limited
    Inventors: Tommy LANGNES, Pradyumna THIRUVENKATANATHAN
  • Patent number: 9551576
    Abstract: The invention comprises an inertial sensor comprising a frame, a proof mass, a first resonant element, the first resonant element being fixed to the frame and electrostatically coupled to the proof mass, and a second resonant element, the second resonant element being fixed to the frame, adjacent to the first resonant element such that there is substantially no electrostatic coupling between the second resonant element and the proof mass. A coupling is provided between the first resonant element and the second resonant element. A drive means is coupled to the first and second resonant elements for vibrating the first and second resonant elements and a sensor assembly is provided for detecting the amplitude of vibration of at least one of the resonant elements.
    Type: Grant
    Filed: November 22, 2012
    Date of Patent: January 24, 2017
    Assignee: Cambridge Enterprise Limited
    Inventors: Pradyumna Thiruvenkatanathan, Ashwin Seshia
  • Patent number: 9310391
    Abstract: An inertial sensor comprising: a frame; a proof mass suspended from the frame; a pair of first resonant elements electrically coupled to the proof mass, or to an intermediate component mechanically coupled to the proof mass, each first resonant element coupled to an opposite side of the proof mass to the other, the first resonant elements being substantially identical to one another and having substantially identical electrostatic coupling with the proof mass when the sensor is not accelerating; wherein the first resonant elements and proof mass lie substantially in a plane, and wherein movement of the proof mass relative to the first resonant elements orthogonal to the plane alters the electrostatic coupling between the proof mass and the first resonant elements; drive means coupled to the first resonant elements for vibrating each of the first resonant elements; and a sensor assembly for detecting a shift in the resonant frequency of each of the first resonant elements; and processing means for summing the
    Type: Grant
    Filed: September 4, 2013
    Date of Patent: April 12, 2016
    Assignee: Cambridge Enterprise Limited
    Inventors: Ashwin Arunkumar Seshia, Pradyumna Thiruvenkatanathan, Xudong Zou
  • Patent number: 9261525
    Abstract: The invention comprises an inertia! sensor comprising a frame, a proof mass; a first resonant element having a proximal end and a distal end, the first resonant element being fixed to the frame at its proximal end and coupled to the proof mass at its distal end, a second resonant element having a proximal end and a distal end, the second resonant element being fixed to the frame at its proximal end, adjacent to the first resonant element such that there is no coupling between the second resonant element and the proof mass, a means for coupling the first resonant element to the second resonant element; a drive means coupled to the first and second resonant elements for vibrating the first and second resonant elements; and a sensor assembly for detecting the amplitude of vibration of the resonant elements.
    Type: Grant
    Filed: May 26, 2011
    Date of Patent: February 16, 2016
    Assignee: Cambridge Enterprise Limited
    Inventors: Pradyumna Thiruvenkatanathan, Ashwin Seshia, Jize Yan
  • Publication number: 20150226762
    Abstract: An inertial sensor comprising: a frame; a proof mass suspended from the frame; a pair of first resonant elements electrically coupled to the proof mass, or to an intermediate component mechanically coupled to the proof mass, each first resonant element coupled to an opposite side of the proof mass to the other, the first resonant elements being substantially identical to one another and having substantially identical electrostatic coupling with the proof mass when the sensor is not accelerating; wherein the first resonant elements and proof mass lie substantially in a plane, and wherein movement of the proof mass relative to the first resonant elements orthogonal to the plane alters the electrostatic coupling between the proof mass and the first resonant elements; drive means coupled to the first resonant elements for vibrating each of the first resonant elements; and a sensor assembly for detecting a shift in the resonant frequency of each of the first resonant elements; and processing means for summing the
    Type: Application
    Filed: September 4, 2013
    Publication date: August 13, 2015
    Inventors: Ashwin Arunkumar Seshia, Pradyumna Thiruvenkatanathan, Xudong Zou