Patents by Inventor Arthur H Hartog

Arthur H Hartog 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: 10359302
    Abstract: Using hDVS techniques to detect a disturbance in a coherent Rayleigh backscatter caused by the presence of another optical signal in the fiber. The interaction can be caused by a pump pulse travelling shortly after a probe pulse and at a frequency close to that of the probe plus or minus a Brillouin frequency shift. This results in gain or attenuation of the backscatter signal. The Brillouin shift is a function of temperature and strain.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: July 23, 2019
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Arthur H. Hartog, Florian Englich
  • Patent number: 10113902
    Abstract: A fiber optic distributed vibration system for detecting seismic signals in an earth formation is provided. The system includes a fiber optic cable deployed in a borehole that extends into the earth formation and which is configured to react along its length to a seismic wave incident on the fiber optic cable from outside the borehole. An optical source launches an optical signal into the fiber optic cable while the seismic wave is incident thereon. A receiver detects coherent Rayleigh noise (CRN) produced in response to the optical signal. A processing circuit processes the detected CRN signal to determine characteristics of the earth formation.
    Type: Grant
    Filed: October 18, 2016
    Date of Patent: October 30, 2018
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Richard T. Coates, Douglas E. Miller, Arthur H. Hartog, Colin A. Wilson, Dominic Brady, Henry Menkiti, Francois M. Auzerais, Ian David Richard Bradford
  • Patent number: 9798023
    Abstract: Disclosed are a system, apparatus, and method for optical fiber well deployment in seismic optical surveying. Embodiments of this disclosure may include methods of deploying a spooled optical fiber distributed sensor into the wellbore integrated in a ballast or weight for a seismic optic tool, to achieve deployment of a lightweight disposable fiber optic cable against the wellbore walls via gravity. The method may further include unspooling the spooled optical fiber distributed sensor and using the optical fiber as a distributed seismic receiver. Once the fiber optic distributed sensor is deployed according to methods of the present disclosure, surveys may be obtained and processed by various methods.
    Type: Grant
    Filed: January 4, 2013
    Date of Patent: October 24, 2017
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Pierre Vigneaux, Arthur H. Hartog, Bernard Frignet
  • Publication number: 20170248008
    Abstract: A sensor assembly for passive detections of downhole well features. Embodiments include a casing collar locator assembly that utilizes fiber optics in combination with a magneto-responsive sensor to detect casing collars and provide real-time location information in a well. The sensor may be configured to work with a poled monolithic structure that is dimensionally responsive to voltage in a way that substantially eliminates noise during detections. Additionally, the sensor may be intentionally imbalanced, utilizing multiple fibers of different lengths and multiple wavelength monitoring so as to provide enhanced directional information as well as allow operators to decipher and address circumstances of polarization fade.
    Type: Application
    Filed: August 29, 2014
    Publication date: August 31, 2017
    Inventors: Dominic BRADY, Arthur H. HARTOG
  • Publication number: 20170176221
    Abstract: Using hDVS techniques to detect a disturbance in a coherent Rayleigh backscatter caused by the presence of another optical signal in the fiber. The interaction can be caused by a pump pulse travelling shortly after a probe pulse and at a frequency close to that of the probe plus or minus a Brillouin frequency shift. This results in gain or attenuation of the backscatter signal. The Brillouin shift is a function of temperature and strain.
    Type: Application
    Filed: December 15, 2016
    Publication date: June 22, 2017
    Inventors: Arthur H. Hartog, Florian Englich
  • Publication number: 20170167245
    Abstract: Monitoring one or more items of equipment associated with a borehole or other conduit. A sensor system includes a vibration sensor for sensing vibrations at one or more sensor locations associated with one or more items of the equipment and/or the borehole or other conduit. A processing system processes the sensor information to determine a characteristic of the operation of the one or more items of equipment and/or the borehole or other conduit.
    Type: Application
    Filed: February 2, 2015
    Publication date: June 15, 2017
    Inventors: Paul Frederick Cilgrim Dickenson, Gareth P. Lees, Arthur H. Hartog, Cheng-Gang Xie, Paul Simon Hammond, Ashley Bernard Johnson, Gary Martin Oddie, Andrew William Meredith, Franck Bruno Jean Monmont, Theo Cuny
  • Publication number: 20170096890
    Abstract: A system and methods for drilling a well in a field having an previously drilled well are provided. In accordance with one example, a method includes drilling a new well in a geological formation having an previously drilled well using a bottom hole assembly (BHA) having a transmitter. The method also includes transmitting a signal while drilling using the transmitter of the BHA. Further, the method includes measuring from the previously drilled well the signal from the transmitter received by at least one optical fiber disposed within the previously drilled well.
    Type: Application
    Filed: October 6, 2015
    Publication date: April 6, 2017
    Inventors: Arthur H. Hartog, Karim Boudah, Miguel F. Pabon
  • Publication number: 20170038246
    Abstract: A fiber optic distributed vibration system for detecting seismic signals in an earth formation is provided. The system includes a fiber optic cable deployed in a borehole that extends into the earth formation and which is configured to react along its length to a seismic wave incident on the fiber optic cable from outside the borehole. An optical source launches an optical signal into the fiber optic cable while the seismic wave is incident thereon. A receiver detects coherent Rayleigh noise (CRN) produced in response to the optical signal. A processing circuit processes the detected CRN signal to determine characteristics of the earth formation.
    Type: Application
    Filed: October 18, 2016
    Publication date: February 9, 2017
    Inventors: Richard T. Coates, Douglas E. Miller, Arthur H. Hartog, Colin A. Wilson, Dominic Brady, Henry Menkiti, Francois M. Auzerais, Ian David Richard Bradford
  • Patent number: 9546548
    Abstract: A distributed acoustic wave detection system and method is provided. The system may include a fiber optic cable deployed in a well and configured to react to pressure changes resulting from a propagating acoustic wave and an optical source configured to launch interrogating pulses into the fiber optic cable. In addition, the system may include a receiver configured to detect coherent Rayleigh noise produced in response to the interrogating pulses. The CRN signal may be used to track the propagation of the acoustic waves in the well. Such capability allows the location of the cement sheath, as well as measuring the bonding of cement to at least a casing string at least partially surrounded by a cement sheath.
    Type: Grant
    Filed: September 19, 2012
    Date of Patent: January 17, 2017
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Arthur H. Hartog, William B. Underhill, Simon Severance, Samantha Rist
  • Patent number: 9476760
    Abstract: A fiber optic distributed vibration sensor provides a highly sensitive measurement of a measurand with a high degree of linearity. The distributed vibration sensor includes subsections configured to have a high sensitivity to a measurand of interest interspaced in an alternating manner with subsections having a low sensitivity to the measurand. The distributed vibration sensor is interrogated such that a phase difference between the backscattered signals generated in low sensitivity subsections surrounding a high sensitivity subsection can be determined. Characteristics of the measurand may then be determined based on the phase difference.
    Type: Grant
    Filed: June 25, 2010
    Date of Patent: October 25, 2016
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Dominic Brady, Arthur H. Hartog
  • Patent number: 9470807
    Abstract: A fiber optic distributed vibration system for detecting seismic signals in an earth formation is provided. The system includes a fiber optic cable deployed in a borehole that extends into the earth formation and which is configured to react along its length to a seismic wave incident on the fiber optic cable from outside the borehole. An optical source launches an optical signal into the fiber optic cable while the seismic wave is incident thereon. A receiver detects coherent Rayleigh noise (CRN) produced in response to the optical signal. A processing circuit processes the detected CRN signal to determine characteristics of the earth formation.
    Type: Grant
    Filed: November 6, 2013
    Date of Patent: October 18, 2016
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Richard T. Coates, Douglas E. Miller, Arthur H. Hartog, Colin A. Wilson, Dominic Brady, Henry Menkiti, Francois M. Auzerais, Ian David Richard Bradford
  • Patent number: 9429450
    Abstract: A method for measuring Brillouin backscattering from an optical fiber, comprising mixing backscattered light received from the optical fiber and having a Brillouin frequency f?(t) with coherent light at a frequency f i in an optical detector to produce an electrical signal with a difference frequency ?F(t)=f?(t)?f15 and directly digitizing the electrical signal using an analog-to-digital converter to generate a sequence of samples representing the electrical signal, the samples then being processed to determine one or more properties of the Brillouin spectral line. The difference frequency may be further reduced by an additional frequency mixing stage to allow digitization at a lower sampling rate.
    Type: Grant
    Filed: August 7, 2007
    Date of Patent: August 30, 2016
    Assignee: Schlumberger Technology Corporation
    Inventor: Arthur H. Hartog
  • Patent number: 9377551
    Abstract: A method of detecting seismic waves traveling through a subsurface formation includes lowering a cable into a borehole in the subsurface formation, the cable having at least one optical fiber associated therewith, and causing descent of a remote end of the cable to be arrested. The method further includes feeding a further length of the cable into the borehole such that the cable is slack and in contact with at least part of a wall of the borehole, and using an interrogator coupled to the at least one optical fiber to detect seismic waves traveling through the subsurface formation and into the cable.
    Type: Grant
    Filed: May 22, 2013
    Date of Patent: June 28, 2016
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Arthur H. Hartog, Bernard Frignet, Duncan Mackie, Michael Clark
  • Patent number: 9316754
    Abstract: A seismic acquisition system includes a distributed optical sensor (having an optical fiber) and an interrogation subsystem configured to generate a light signal to emit into the optical fiber. The interrogation subsystem receives, from the distributed optical sensor, backscattered light responsive to the emitted light signal, wherein the backscattered light is affected by one or both of seismic signals reflected from a subterranean structure and noise. Output data corresponding to the backscattered light is provided to a processing subsystem to determine a characteristic of the subterranean structure.
    Type: Grant
    Filed: November 21, 2014
    Date of Patent: April 19, 2016
    Assignee: Schlumberger Technology Corporation
    Inventors: Ed Kragh, Everhard Muyzert, Johan Robertsson, Douglas E. Miller, Arthur H. Hartog
  • Patent number: 9151152
    Abstract: A fiber optic sensing tool assembly is deployed in a wellbore that penetrates a hydrocarbon-bearing formation of interest to measure fluid composition and other fluid characteristics. This measurement is implemented by deploying the tool in a region in which there is substantially no fluid flow and by heating the tool through an optical delivery system. Parameters of the fluid are monitored as a function of the heating of the tool to derive information that is indicative of fluid composition and other fluid characteristics.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: October 6, 2015
    Assignee: Schlumberger Technology Corporation
    Inventors: Dominic Brady, Arthur H. Hartog
  • Patent number: 9146165
    Abstract: A fiber optic cable includes a strain element including a first optical fiber and an optical element including a second optical fiber. The optical element is compliantly coupled with the strain element to transfer a portion of strain experienced by the strain element to the optical element. A fiber optic cable includes a strain transfer member, a central optical fiber disposed through the strain transfer member, and a tight jacket mechanically coupling the central optical fiber and the strain transfer member. The fiber optic cable further includes a compliant layer disposed about and affixed to the strain transfer member; a peripheral optical fiber disposed in the compliant layer, such that a portion of the strain experienced by the strain transfer member is transferred to the peripheral optical fiber via the compliant layer; and a protective cover disposed about the compliant layer.
    Type: Grant
    Filed: February 22, 2007
    Date of Patent: September 29, 2015
    Assignee: Schlumberger Technology Corporation
    Inventors: Arthur H. Hartog, Andrew P. Strong
  • Patent number: 8989526
    Abstract: A method of providing Raman amplification in an optical fiber sensing system, comprises generating a probe pulse of light and launching the pulse into a sensing optical fiber, generating pump light at a shorter wavelength and modulating it to produce a time-varying intensity profile, and launching the pump light into the sensing fiber. such that the intensity of the launched pump light during launch of the probe pulse is different from the intensity at other times. Raman amplification of backscattered light produced by the probe pulse as it propagates along the fiber is achieved, as is amplification of the probe pulse if the pump power is non-zero during launch of the probe pulse.
    Type: Grant
    Filed: July 12, 2007
    Date of Patent: March 24, 2015
    Assignee: Schlumberger Technology Corporation
    Inventor: Arthur H. Hartog
  • Publication number: 20150076334
    Abstract: A seismic acquisition system includes a distributed optical sensor (having an optical fiber) and an interrogation subsystem configured to generate a light signal to emit into the optical fiber. The interrogation subsystem receives, from the distributed optical sensor, backscattered light responsive to the emitted light signal, wherein the backscattered light is affected by one or both of seismic signals reflected from a subterranean structure and noise. Output data corresponding to the backscattered light is provided to a processing subsystem to determine a characteristic of the subterranean structure.
    Type: Application
    Filed: November 21, 2014
    Publication date: March 19, 2015
    Inventors: Ed Kragh, Everhard Muyzert, Johan Robertsson, Douglas E. Miller, Arthur H. Hartog
  • Patent number: 8947232
    Abstract: An intrusion detection system for monitoring a premises includes at least one optical cable that houses at least one optical fiber and extends about the premises. Optical time domain reflectometry (OTDR) means is operably coupled to opposite first and second ends of the at least one optical fiber. The OTDR means includes first signal processing circuitry that analyzes the backscatter signal received via the first end of the at least one optical fiber in order to detect an intrusion of the premises, and second signal processing circuitry that analyzes the backscatter signal received via the second end of the at least one optical fiber in order to detect an intrusion of the premises. The redundancy of intrusions decisions made by the first and second signal processing circuitry can be verified.
    Type: Grant
    Filed: December 6, 2007
    Date of Patent: February 3, 2015
    Assignee: Schlumberger Technology Corporation
    Inventors: Andrew Strong, Arthur H. Hartog
  • Patent number: 8924158
    Abstract: A seismic acquisition system includes a distributed optical sensor (having an optical fiber) and an interrogation subsystem configured to generate a light signal to emit into the optical fiber. The interrogation subsystem receives, from the distributed optical sensor, backscattered light responsive to the emitted light signal, wherein the backscattered light is affected by one or both of seismic signals reflected from a subterranean structure and noise. Output data corresponding to the backscattered light is provided to a processing subsystem to determine a characteristic of the subterranean structure.
    Type: Grant
    Filed: August 9, 2010
    Date of Patent: December 30, 2014
    Assignee: Schlumberger Technology Corporation
    Inventors: Ed Kragh, Everhard Muyzert, Johan Robertsson, Douglas E. Miller, Arthur H. Hartog