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).
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Patent number: 11221431Abstract: 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. The amount of CO2 is determined from the intensities of the mid-infrared radiation passing through the three filters.Type: GrantFiled: January 12, 2021Date of Patent: January 11, 2022Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Go Fujisawa, Sheng Chao, Timothy Jones, Nathan Lawrence, Rolf Rustad, Li Jiang, Steven Gahlings
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Publication number: 20210165123Abstract: 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. The amount of CO2 is determined from the intensities of the mid-infrared radiation passing through the three filters.Type: ApplicationFiled: January 12, 2021Publication date: June 3, 2021Inventors: Go Fujisawa, Sheng Chao, Timothy Jones, Nathan Lawrence, Rolf Rustad, Li Jiang, Steven Gahlings
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Patent number: 10921482Abstract: 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: GrantFiled: September 9, 2015Date of Patent: February 16, 2021Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Go Fujisawa, Sheng Chao, Timothy Jones, Nathan Lawrence, Rolf Rustad, Li Jiang, Steven Gahlings
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Patent number: 10865638Abstract: 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 transmitted through the first filter, and determines therefrom an amount of the species in the fluid.Type: GrantFiled: November 26, 2019Date of Patent: December 15, 2020Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Timothy Jones, Nathan Lawrence, Go Fujisawa, Sheng Chao, Rolf Rustad
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Publication number: 20200165916Abstract: 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 transmitted through the first filter, and determines therefrom an amount of the species in the fluid.Type: ApplicationFiled: November 26, 2019Publication date: May 28, 2020Inventors: Timothy Jones, Nathan Lawrence, Go Fujisawa, Sheng Chao, Rolf Rustad
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Patent number: 10539500Abstract: 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: GrantFiled: September 9, 2015Date of Patent: January 21, 2020Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Timothy Jones, Nathan Lawrence, Go Fujisawa, Sheng Chao, Steven Gahlings
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Patent number: 10487646Abstract: 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 transmitted through the first filter, and determines therefrom an amount of the species in the fluid.Type: GrantFiled: September 9, 2015Date of Patent: November 26, 2019Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Timothy Jones, Nathan Lawrence, Go Fujisawa, Sheng Chao
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Patent number: 10345480Abstract: 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: GrantFiled: September 9, 2015Date of Patent: July 9, 2019Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Timothy Jones, Nathan Lawrence, Go Fujisawa, Sheng Chao, Li Jiang
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Publication number: 20180320508Abstract: 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: ApplicationFiled: September 9, 2015Publication date: November 8, 2018Inventors: Timothy Jones, Nathan Lawrence, Go Fujisawa, Sheng Chao
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Publication number: 20180231684Abstract: 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: ApplicationFiled: September 9, 2015Publication date: August 16, 2018Inventors: Timothy Jones, Nathan Lawrence, Go Fujisawa, Sheng Chao, Li Jiang
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Publication number: 20170241899Abstract: 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: ApplicationFiled: September 9, 2015Publication date: August 24, 2017Inventors: Timothy JONES, Nathan LAWRENCE, Go FUJISAWA, Sheng CHAO, Steven GAHLINGS
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Publication number: 20170242150Abstract: 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: ApplicationFiled: September 11, 2015Publication date: August 24, 2017Inventors: Timothy Jones, Nathan Lawrence, Go Fujisawa
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Publication number: 20170242151Abstract: 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: ApplicationFiled: September 9, 2015Publication date: August 24, 2017Inventors: Timothy Jones, Nathan Scott Lawrence, Go Fujisawa, Sheng Chao, Rolf Rustad
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Publication number: 20170242149Abstract: 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: ApplicationFiled: September 9, 2015Publication date: August 24, 2017Inventors: Go Fujisawa, Sheng Chao, Timothy Jones, Nathan Lawrence, Rolf Rustad, Li Jiang, Steven Gahlings
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Patent number: 8909478Abstract: 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: GrantFiled: November 9, 2010Date of Patent: December 9, 2014Assignee: Schlumberger Technology CorporationInventors: Maki Ikeda, Sophie Nazik Godefroy, Go Fujisawa
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Patent number: 8904859Abstract: 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: GrantFiled: January 19, 2012Date of Patent: December 9, 2014Assignee: Schlumberger Technology CorporationInventors: 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
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Patent number: 8813554Abstract: 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: GrantFiled: June 1, 2011Date of Patent: August 26, 2014Assignee: Schlumberger Technology CorporationInventors: Go Fujisawa, Andrew J. Carnegie, Jack H. Harfoushian, Saifon Daungkaew Sirimongkolkitti, Oliver C. Mullins
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Patent number: 8555696Abstract: 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: GrantFiled: July 3, 2008Date of Patent: October 15, 2013Assignee: Schlumberger Technology CorporationInventors: Chengli Dong, Ricardo R. Vasques, Michael O'Keefe, Peter S. Hegeman, Oliver C. Mullins, Go Fujisawa, Stephane Vannuffelen, Richard Jackson, Ahmad Saputra
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Patent number: 8393207Abstract: 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: GrantFiled: February 16, 2009Date of Patent: March 12, 2013Assignee: Schlumberger Technology CorporationInventors: Go Fujisawa, Sophie Nazik Godefroy
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Publication number: 20120304757Abstract: 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: ApplicationFiled: June 1, 2011Publication date: December 6, 2012Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: GO FUJISAWA, ANDREW J. CARNEGIE, JACK H. HARFOUSHIAN, SAIFON DAUNGKAEW SIRIMONGKOLKITTI, OLIVER C. MULLINS