Patents by Inventor Go Fujisawa

Go Fujisawa 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).

  • Patent number: 10345480
    Abstract: A sensor is provided for monitoring a mineral acid dissolved in a liquid. The sensor includes an internal reflection window which, in use, is in direct contact with the liquid. The sensor further includes a mid-infrared light source which directs a beam of mid-infrared radiation into said window for attenuated internal reflection at an interface between the window and the liquid. The sensor further includes a first narrow bandpass filter which preferentially transmits mid-infrared radiation over a band of wavelengths corresponding to an absorbance peak of the dissolved mineral acid to filter internally reflected mid-infrared radiation received from the window. The sensor further includes an infrared detector which detects filtered mid-infrared radiation transmitted through the first filter.
    Type: Grant
    Filed: September 9, 2015
    Date of Patent: July 9, 2019
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Timothy Jones, Nathan Lawrence, Go Fujisawa, Sheng Chao, Li Jiang
  • Publication number: 20180320508
    Abstract: A sensor for monitoring a species which is a component of a fluid. The sensor includes an internal reflection window which, in use, is in direct contact with the fluid. The sensor further includes a mid-infrared light source which directs a beam of mid-infrared radiation into said window for attenuated internal reflection at an interface between the window and the fluid. The sensor further includes a first narrow bandpass filter which preferentially transmits mid-infrared radiation over a band of wavelengths corresponding to an absorbance peak of the species. The sensor further includes an infrared detector which detects filtered mid-infrared radiation transmitted through the first filter and a processor for measuring the intensity of the detected mid-infrared radiation trans mined through the first filter, and determines therefrom an amount of the species in the fluid.
    Type: Application
    Filed: September 9, 2015
    Publication date: November 8, 2018
    Inventors: Timothy Jones, Nathan Lawrence, Go Fujisawa, Sheng Chao
  • Publication number: 20180231684
    Abstract: A sensor is provided for monitoring a mineral acid dissolved in a liquid. The sensor includes an internal reflection window which, in use, is in direct contact with the liquid. The sensor further includes a mid-infrared light source which directs a beam of mid-infrared radiation into said window for attenuated internal reflection at an interface between the window and the liquid. The sensor further includes a first narrow bandpass filter which preferentially transmits mid-infrared radiation over a band of wavelengths corresponding to an absorbance peak of the dissolved mineral acid to filter internally reflected mid-infrared radiation received from the window. The sensor further includes an infrared detector which detects filtered mid-infrared radiation transmitted through the first filter.
    Type: Application
    Filed: September 9, 2015
    Publication date: August 16, 2018
    Inventors: Timothy Jones, Nathan Lawrence, Go Fujisawa, Sheng Chao, Li Jiang
  • Publication number: 20170242151
    Abstract: A sensor for monitoring a hydrate inhibitor dissolved in a liquid. The sensor includes an internal reflection window for contacting with the liquid. The sensor further includes a mid-infrared light source for directs a beam of mid-infrared radiation into the window to provide for attenuated internal reflection at an interface between the window and the liquid. The internally reflected mid-infrared beam is passed through a narrow bandpass filter which preferentially transmits mid-infrared radiation over a band of wavelengths corresponding to an absorbance peak of the dissolved hydrate inhibitor to filter internally reflected mid-infrared radiation received from the window. The intensity of the reflected mid-infrared beam transmitted through the filter is measured and used to determine an amount of hydrate inhibitor ion the liquid.
    Type: Application
    Filed: September 9, 2015
    Publication date: August 24, 2017
    Inventors: Timothy Jones, Nathan Scott Lawrence, Go Fujisawa, Sheng Chao, Rolf Rustad
  • Publication number: 20170242149
    Abstract: A sensor for monitoring CO2 in a fluid regardless of the phase properties of the fluid, i.e., regardless of whether the fluid contacting the window is a liquid water-based phase, a liquid oil-based phase, a mixture of liquid water and liquid oil-based phases, or a gas phase. The sensor includes an internal reflection window for contacting with the fluid. A mid-infrared light source directs a beam of mid-infrared radiation into the window and the beam is internal reflected at an interface between the window and the fluid. The reflected beam is passed through three narrow bandpass filters which preferentially transmit mid-infrared radiation over bands of wavelengths corresponding to absorbance peaks of water, oil and CO2.
    Type: Application
    Filed: September 9, 2015
    Publication date: August 24, 2017
    Inventors: Go Fujisawa, Sheng Chao, Timothy Jones, Nathan Lawrence, Rolf Rustad, Li Jiang, Steven Gahlings
  • Publication number: 20170241899
    Abstract: An integrated approach for cleaning an active surface of a petrochemical sensor. Sensors in the petrochemical industry are often deployed in locations where they are prone to fouling. By heating the active surface fouling substances may be removed from the active surface. Heating the surface above a supercritical point of a fluid being sensed may create a fluid that may serve to clean the active surface. Limiting the duration of the applied heating and/or pulsing the heating may mitigate adverse effects of use of high temperatures. A doped active surface, such as a doped diamond window may be designed to have conductive areas in the window that may be used for resistive heating of the window.
    Type: Application
    Filed: September 9, 2015
    Publication date: August 24, 2017
    Inventors: Timothy JONES, Nathan LAWRENCE, Go FUJISAWA, Sheng CHAO, Steven GAHLINGS
  • Publication number: 20170242150
    Abstract: A sensor is provided for monitoring cement. An internal reflection is contacted with the cement and a mid-infrared light source directs a beam of mid-infrared radiation into said window for attenuated internal reflection at an interface between the window and the cement. The reflected infrared radiation is passed through a first narrow bandpass filter that preferentially transmits mid-infrared radiation over a band of wavelengths corresponding to an absorbance peak of a species associated with the cement to filter internally reflected mid-infrared radiation received from the window. An infrared detector detects filtered mid-infrared radiation transmitted through the first filter and a processor measures the intensity of the detected mid-infrared radiation transmitted through the first filter, and determines therefrom an amount of the species associated with the cement.
    Type: Application
    Filed: September 11, 2015
    Publication date: August 24, 2017
    Inventors: Timothy Jones, Nathan Lawrence, Go Fujisawa
  • Patent number: 8909478
    Abstract: A method and a tool that implements a method which includes measuring the viscosity and flow rates of formation fluids and obtaining the ratio of relative permeabilities of the formation fluids and wettability of the formation using the same.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: December 9, 2014
    Assignee: Schlumberger Technology Corporation
    Inventors: Maki Ikeda, Sophie Nazik Godefroy, Go Fujisawa
  • Patent number: 8904859
    Abstract: A gas separation and detection tool for performing in situ analysis of borehole fluid is described. The tool comprises a sampling chamber for a downhole fluid. The sample chamber comprises a detector cell with an opening. The tool also comprises a gas separation module for taking a gas from the downhole fluid. The gas separation module comprises a membrane located in the opening, a support for holding the membrane, and a sealant applied between the housing and the membrane or support. Moreover, the tool comprises a gas detector for sensing the gas.
    Type: Grant
    Filed: January 19, 2012
    Date of Patent: December 9, 2014
    Assignee: Schlumberger Technology Corporation
    Inventors: Jimmy Lawrence, Tim G. J. Jones, Kentaro Indo, Tsutomu Yamate, Noriyuki Matsumoto, Michael M. Toribio, Hidetoshi Yoshiuchi, Andrew Meredith, Nathan S. Lawrence, Li Jiang, Go Fujisawa, Oliver C. Mullins
  • Patent number: 8813554
    Abstract: Methods of and apparatus to estimate one or more volumes of one or more components of a fluid in a sample chamber of a downhole tool are described. An example method includes obtaining a sample chamber volume measurement, a flowline volume measurement and a supplemental volume measurement. The example method includes drawing the fluid into the sample chamber until the sample chamber is substantially full and measuring a characteristic of the fluid in the sample chamber at a first time to obtain a first characteristic measurement. The example method also includes adding a supplemental volume corresponding to the supplemental volume measurement to over-pressurize the sample chamber after measuring the characteristic at the first time and measuring the characteristic of the fluid in the sample chamber at a second time to obtain a second characteristic measurement. The second time is after the sample chamber is over-pressurized.
    Type: Grant
    Filed: June 1, 2011
    Date of Patent: August 26, 2014
    Assignee: Schlumberger Technology Corporation
    Inventors: Go Fujisawa, Andrew J. Carnegie, Jack H. Harfoushian, Saifon Daungkaew Sirimongkolkitti, Oliver C. Mullins
  • Patent number: 8555696
    Abstract: Methods of calibrating a fluid analyzer for use in a wellbore are described. An example method of generating calibration data for a fluid analyzer for use in a downhole tool involves lowering a downhole tool including a fluid analyzer to a location in a wellbore, measuring, via the fluid analyzer, a characteristic value of a calibration fluid or a vacuum while the fluid analyzer is at the location, obtaining an expected characteristic value for the calibration fluid or the vacuum at the location, and comparing the measured characteristic value to the expected characteristic value to generate a calibration value for the fluid.
    Type: Grant
    Filed: July 3, 2008
    Date of Patent: October 15, 2013
    Assignee: Schlumberger Technology Corporation
    Inventors: Chengli Dong, Ricardo R. Vasques, Michael O'Keefe, Peter S. Hegeman, Oliver C. Mullins, Go Fujisawa, Stephane Vannuffelen, Richard Jackson, Ahmad Saputra
  • Patent number: 8393207
    Abstract: Methods and apparatus to use multiple sensors to measure downhole fluid properties are described. An example method of measuring a property of a downhole fluid involves obtaining a plurality of measurements for each of a plurality of sensors. Each of the measurements corresponds to a same property of the downhole fluid, and each of the sensors is differently configured to measure the property. Additionally, the example method involves obtaining a plurality of weighting values, each of which corresponds to one of the sensors. The example method also involves applying the weighting values to the respective measurements obtained by each of the corresponding sensors to generate a weight-corrected measurement for each of the sensors. Further still, the example method involves generating a value representative of a measurement of the property of the downhole fluid based on the weight-corrected measurements and outputting the value representative of the measurement of the property.
    Type: Grant
    Filed: February 16, 2009
    Date of Patent: March 12, 2013
    Assignee: Schlumberger Technology Corporation
    Inventors: Go Fujisawa, Sophie Nazik Godefroy
  • Publication number: 20120304757
    Abstract: Methods of and apparatus to estimate one or more volumes of one or more components of a fluid in a sample chamber of a downhole tool are described. An example method includes obtaining a sample chamber volume measurement, a flowline volume measurement and a supplemental volume measurement. The example method includes drawing the fluid into the sample chamber until the sample chamber is substantially full and measuring a characteristic of the fluid in the sample chamber at a first time to obtain a first characteristic measurement. The example method also includes adding a supplemental volume corresponding to the supplemental volume measurement to over-pressurize the sample chamber after measuring the characteristic at the first time and measuring the characteristic of the fluid in the sample chamber at a second time to obtain a second characteristic measurement. The second time is after the sample chamber is over-pressurized.
    Type: Application
    Filed: June 1, 2011
    Publication date: December 6, 2012
    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: GO FUJISAWA, ANDREW J. CARNEGIE, JACK H. HARFOUSHIAN, SAIFON DAUNGKAEW SIRIMONGKOLKITTI, OLIVER C. MULLINS
  • Patent number: 8322196
    Abstract: Vibrating wire viscometers are described. Some example vibrating wire viscometer housings include a flowline through the housing to expose a first wire to a downhole fluid, a cavity in the housing to hold a magnet and to conduct one or more additional wires from the flowline to a signal generator, first and second electrically conductive posts mechanically coupled to the housing to hold the first wire in tension within the flowline, and a seal mechanically coupled to the housing to prevent access to the magnet by the downhole fluid.
    Type: Grant
    Filed: August 2, 2009
    Date of Patent: December 4, 2012
    Assignee: Schlumberger Technology Corporation
    Inventors: Raghu Madhavan, Yu Hatori, Mami Nishida, Sophie Nazik Godefroy, Michael Stangeland, Go Fujisawa
  • Patent number: 8307698
    Abstract: Vibrating wire viscometers are disclosed. An example vibrating wire viscometer includes first and second electrically conductive tubes, where the first tube is at least partially inserted into the second tube, and where the first and second tubes are coupled via an electrically insulating bonding agent. The example viscometer further includes first and second electrically conductive pins inserted into respective ones of the first and second tubes, and an electrically conductive wire fastened to the first and second pins to vibrate in a downhole fluid to determine a viscosity of the downhole fluid.
    Type: Grant
    Filed: August 7, 2009
    Date of Patent: November 13, 2012
    Assignee: Schlumberger Technology Corporation
    Inventors: Noriyuki Matsumoto, Sophie Nazik Godefroy, Kazumasa Kato, Go Fujisawa
  • Publication number: 20120137764
    Abstract: A gas separation and detection tool for performing in situ analysis of borehole fluid is described. The tool comprises a sampling chamber for a downhole fluid. The sample chamber comprises a detector cell with an opening. The tool also comprises a gas separation module for taking a gas from the downhole fluid. The gas separation module comprises a membrane located in the opening, a support for holding the membrane, and a sealant applied between the housing and the membrane or support. Moreover, the tool comprises a gas detector for sensing the gas.
    Type: Application
    Filed: January 19, 2012
    Publication date: June 7, 2012
    Inventors: Jimmy Lawrence, Tim G. J. Jones, Kentaro Indo, Tsutomu Yamate, Noriyuki Matsumoto, Michael M. Toribio, Hidetoshi Yoshiuchi, Andrew Meredith, Nathan S. Lawrence, Li Jiang, Go Fujisawa, Oliver C. Mullins
  • Patent number: 8032303
    Abstract: Methods and apparatus to determine a concentration of nitrogen in a downhole fluid are described. An example apparatus to determine a concentration of nitrogen in a downhole fluid includes a fluid measurement unit to measure a first fluid composition and a density of at least a hydrocarbon and carbon dioxide in a sample of the downhole fluid. Additionally, the example apparatus includes one or more sensors to measure at least a pressure and a temperature of the sample. Further, the example apparatus includes a processing unit to determine a first theoretical density based on at least the first fluid composition, the temperature, and the pressure the sample. Further still, the example apparatus includes an analyzer to determine a first difference between the density of at least the hydrocarbon and the carbon dioxide in the sample and the first theoretical density. The first difference is associated with a concentration of nitrogen in the sample.
    Type: Grant
    Filed: November 24, 2008
    Date of Patent: October 4, 2011
    Assignee: Schlumberger Technology Corporation
    Inventors: Go Fujisawa, Chee Kin Khong, Oliver C. Mullins
  • Publication number: 20110061439
    Abstract: Methods of calibrating a fluid analyzer for use in a wellbore are described. An example method of generating calibration data for a fluid analyzer for use in a downhole tool involves lowering a downhole tool including a fluid analyzer to a location in a wellbore, measuring, via the fluid analyzer, a characteristic value of a calibration fluid or a vacuum while the fluid analyzer is at the location, obtaining an expected characteristic value for the calibration fluid or the vacuum at the location, and comparing the measured characteristic value to the expected characteristic value to generate a calibration value for the fluid.
    Type: Application
    Filed: July 3, 2008
    Publication date: March 17, 2011
    Inventors: Chengli Dong, Ricardo R. Vasques, Michael O'Keefe, Peter S. Hegeman, Oliver C. Mullins, Go Fujisawa, Stephane Vannuffelen, Richard Jackson, Ahmad Saputra
  • Publication number: 20110054796
    Abstract: A method and a tool that implements a method which includes measuring the viscosity and flow rates of formation fluids and obtaining the ratio of relative permeabilities of the formation fluids and wettability of the formation using the same.
    Type: Application
    Filed: November 9, 2010
    Publication date: March 3, 2011
    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: MAKI IKEDA, SOPHIE NAZIK GODEFROY, GO FUJISAWA
  • Publication number: 20110030455
    Abstract: Vibrating wire viscometers are disclosed. An example vibrating wire viscometer includes first and second electrically conductive tubes, where the first tube is at least partially inserted into the second tube, and where the first and second tubes are coupled via an electrically insulating bonding agent. The example viscometer further includes first and second electrically conductive pins inserted into respective ones of the first and second tubes, and an electrically conductive wire fastened to the first and second pins to vibrate in a downhole fluid to determine a viscosity of the downhole fluid.
    Type: Application
    Filed: August 7, 2009
    Publication date: February 10, 2011
    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: NORIYUKI MATSUMOTO, SOPHIE NAZIK GODEFROY, KAZUMASA KATO, GO FUJISAWA