Underwater Patents (Class 181/110)
  • Patent number: 10459100
    Abstract: Techniques are disclosed relating to geophysical surveying and data processing using streamers at different depths. In one embodiment, a method includes obtaining geophysical data that is specific to a geophysical formation and representative of: a particle motion signal recorded using sensors at a first depth, a first pressure signal recorded using sensors towed at the first depth, and a second pressure signal recorded using sensors towed at a second, greater depth. In this embodiment the method includes modifying a low-frequency range of the particle motion signal using particle motion information estimated based on the second pressure signal. The modified particle motion signal may then be used to separate up-going and down-going wavefields. In some embodiments, obtaining geophysical data is performed by towing a first streamer at the first depth and a second streamer at the second depth. In some embodiments, the second streamer does not include particle motion sensors.
    Type: Grant
    Filed: November 7, 2013
    Date of Patent: October 29, 2019
    Assignee: PGS Geophysical AS
    Inventor: Stian Hegna
  • Patent number: 10345472
    Abstract: A method for estimating a time variant signal representing a seismic source obtains seismic data recorded by at least one receiver and generated by the seismic source, the recorded seismic data comprising direct arrivals and derives the time variant signal using an operator that relates the time variant signal to the acquired seismic data, the operator constrained such that the time variant signal is sparse in time.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: July 9, 2019
    Assignee: CGG SERVICES SAS
    Inventors: Chris Davison, Gordon Poole, Ziqin Yu, Yuan Ni
  • Patent number: 10338258
    Abstract: A system for acquiring a marine seismic survey makes use of a propelled vessel (40) towing at least a seismic source assembly (100) behind it. The navigation control system (42) of the propelled vessel is instructed to steer the propelled vessel in response to position information repetitively generated by a source global positioning system (GPS, 130) which forms part of the seismic source assembly being towed. The position information from the source GPS is thus used to navigate the seismic source assembly to a target location. The position information from the source GPS is also used to trigger activation of the seismic source when the seismic source is located within a pre-determined distance from the target location.
    Type: Grant
    Filed: June 10, 2016
    Date of Patent: July 2, 2019
    Assignee: SHELL OIL COMPANY
    Inventor: David Arthur Chalenski
  • Patent number: 10281602
    Abstract: A system and method for acquiring seismic streamer data is provided. Embodiments may include performing a marine seismic survey using an unmanned marine vessel having a power source configured to drive and provide propulsion to the unmanned marine vessel. Embodiments may further include acquiring one or more of long and ultra-long seismic survey data using a multi-dimensional seismic sensor array coupled with the unmanned marine vessel and providing the seismic survey data as a reduced data set that includes long and ultra long offsets.
    Type: Grant
    Filed: June 18, 2015
    Date of Patent: May 7, 2019
    Assignee: WESTERNGECO L.L.C.
    Inventors: Nicolae Moldoveanu, Denes Vigh, Surrinder Kapoor, Sudhir Pai
  • Patent number: 10254423
    Abstract: An unmanned vessel system can include a hull system configured to provide buoyancy, one or more seismic sources configured to generate seismic energy, and a deployment apparatus configured to deploy the seismic sources from the hull system to a water body or water column. A control system can be configured to operate the deployment apparatus, in order to deploy the one or more seismic sources so that the seismic energy propagates through the water column. A compressed air source can be provided on board the unmanned vessel system, with a source line configured to provide compressed air to the seismic sources.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: April 9, 2019
    Assignee: ION Geophysical Corporation
    Inventors: Timothy A. Dudley, Curt Schneider
  • Patent number: 10222496
    Abstract: Apparatus and methods to operationally deploy land-based seismic nodes. An autonomous or semi-autonomous vehicle includes apparatus for placing, monitoring, testing, servicing, and collecting nodes in a harsh environment such as, e.g., tundra or desert. Associated methods of node deployment and retrieval are disclosed including a ‘rollover deployment.
    Type: Grant
    Filed: December 24, 2014
    Date of Patent: March 5, 2019
    Assignee: FAIRFIELD INDUSTRIES INCORPORATED
    Inventors: James E. Blattman, William Hopewell
  • Patent number: 10139511
    Abstract: Method and system for acquiring seismic data. The marine seismic acquisition system includes a first vessel that follows an inline direction (X); a first source array (S1) configured to generate first seismic waves; and a second source array (S2) configured to generate second seismic waves. The first and second source arrays are towed by the first vessel along the inline direction (X) and a first inline distance (d) between (i) a first center of source (CS1) of the first source array (S1) and (ii) a second center of source (CS2) of the second source array (S2) is different from zero.
    Type: Grant
    Filed: June 1, 2016
    Date of Patent: November 27, 2018
    Assignee: CGG SERVICES SAS
    Inventor: Thomas Mensch
  • Patent number: 10027240
    Abstract: Systems and methods for grounding power generation units with silicon carbide MOSFET power converters are provided. A power generation unit can include a power generator configured to generate multiphase alternating current power at a first voltage. The power generation unit can also include a power converter configured to convert the multiphase alternating current power from the power generator at the first voltage to multiphase alternating current power at a second voltage. The power converter can include one or more silicon carbide MOSFETs and at least one heatsink configured to remove heat from the power converter. The at least one heatsink of the power converter can be electrically connected to a local ground formed by one or more components of the power generation unit.
    Type: Grant
    Filed: January 6, 2017
    Date of Patent: July 17, 2018
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Robert Gregory Wagoner, Govardhan Ganireddy, Saurabh Shukla, Ravisekhar Nadimpalli Raju, Harold Robert Schnetzka
  • Patent number: 9958564
    Abstract: Method and system for acquiring seismic data. The system includes a first streamer vessel configured to tow a first source array and a first streamer spread; a first source vessel configured to tow a second source array; and a second source vessel configured to tow a third source array. The first to third source arrays are distributed along a non-linear profile while the first streamer vessel and the first to second source vessels move along an inline direction (X).
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: May 1, 2018
    Assignee: CGG SERVICES SAS
    Inventors: Damien Grenie, Thomas Mensch, Risto Siliqi
  • Patent number: 9829594
    Abstract: A marine seismic exploration method and system comprised of continuous recording, self-contained ocean bottom pods characterized by low profile casings. An external bumper is provided to promote ocean bottom coupling and prevent fishing net entrapment. Pods are tethered together with flexible, non-rigid, non-conducting cable used to control pod deployment. Pods are deployed and retrieved from a boat deck configured to have a storage system and a handling system to attach pods to cable on-the-fly. The storage system is a juke box configuration of slots wherein individual pods are randomly stored in the slots to permit data extraction, charging, testing and synchronizing without opening the pods. A pod may include an inertial navigation system to determine ocean floor location and a rubidium clock for timing. The system includes mathematical gimballing. The cable may include shear couplings designed to automatically shear apart if a certain level of cable tension is reached.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: November 28, 2017
    Assignee: FAIRFIELD INDUSTRIES, INC.
    Inventors: Clifford H. Ray, Glenn D. Fisseler, James N. Thompson, Hal B. Haygood
  • Patent number: 9766355
    Abstract: Disclosed herein are various embodiments of a method and apparatus to enhance spatial sampling in all nominally horizontal directions for Dual-Sensor seismic data at the bottom of a body of water such as the ocean. The sensor apparatus on the water bottom is comprised of sensing elements for linear particle motion, for rotational motion, for pressure measurement, for pressure gradients, and for static orientation. Stress and wavefield conditions known at the water bottom allow numerical calculations that yield enhanced spatial sampling of pressure and nominally vertical linear particle motion, up to double the conventional (based on physical sensor locations) Nyquist spatial frequency in two nominally horizontal independent directions. The method and apparatus have a wide range of application in Ocean Bottom Seismic 3D, 4D, and Permanent Reservoir Monitoring surveys, and other marine seismic surveys, in oil and gas exploration and production.
    Type: Grant
    Filed: May 7, 2014
    Date of Patent: September 19, 2017
    Inventor: Robert H. Brune
  • Patent number: 9709688
    Abstract: Measurement data is received from first and second seismic sensors, where the first and second seismic sensors are oriented in opposite directions. Each of the first and second seismic sensors has a sensing element responsive to pressure and particle motion. The signals can be combined to remove the particle motion component of the measurement data and obtain pressure-only data. Alternatively, the signals can be combined to deghost the received measurement data.
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: July 18, 2017
    Assignee: WESTERNGECO L.L.C.
    Inventor: Nicolas Goujon
  • Patent number: 9664805
    Abstract: A system and method for handling seismic cable having sensor stations thereon is provided. The seismic cable is positionable about the seismic field for measuring seismic parameters of a subsurface structure. The system includes a mobile unit, a reel and a winch assembly. The mobile unit is positionable about the seismic field, and has a platform. The reel is supportable on the platform with the seismic cable disposable about the reel. The winch assembly is carried by the mobile unit and includes a plurality of cable guides. At least one of the cable guides has a passageway with an adjustable dimension for aligning and guiding the seismic cable and the sensor stations passing therethrough.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: May 30, 2017
    Assignee: SHELL OIL COMPANY
    Inventors: Steven James Maas, Guido Jozef Maria Baeten, Johan Cornelis Hornman, Grant Slack Irwin
  • Patent number: 9651691
    Abstract: Methods and apparatuses for land seismic survey are provided. The methods and apparatuses utilize spatial derivatives of a seismic wavefield to interpolate, regularize or extrapolate seismic data. The methods and apparatuses may considerably reduce land seismic field efforts and/or compensate data gaps.
    Type: Grant
    Filed: April 2, 2013
    Date of Patent: May 16, 2017
    Assignee: WESTERNGECO L.L.C.
    Inventors: Pascal Edme, David Fraser Halliday, Everhard Johan Muijzert, Julian Edward Kragh
  • Patent number: 9594179
    Abstract: Method for estimating source signature of a marine seismic source array in a naturally band-limited subsurface region, for designature processing of resulting seismic data. Direct arrivals identified in the streamer receivers' records (131) provide a far-field estimate of the source signature, provided that the subsurface naturally limits frequencies to below the first notch frequency in the amplitude response of the seismic streamer receiver array. Processing of the direct arrivals may include move out or alignment correction (132), signal enhancement (133), summing of direct arrival traces over all offsets (134), windowing or tapering of direct arrivals (135), and deterministic corrections to the combined direct arrivals to compensate for ghosting and streamer array effects (136).
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: March 14, 2017
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Michael W. Norris, Joseph M. Reilly
  • Patent number: 9588242
    Abstract: A marine vibrator may include a containment housing, a sound radiating surface, and a compliance chamber. The compliance chamber may include a compliance chamber housing, a non-linear linkage assembly, and a low pressure chamber. The compliance chamber housing may define at least a portion of a compliance chamber internal volume having a compliance chamber internal gas pressure. The low pressure chamber may comprise a low pressure piston and a low pressure chamber housing. The low pressure chamber housing may define at least a portion of a low pressure chamber internal volume having a low pressure chamber internal gas pressure. The low pressure piston may be configured to move in response to a pressure differential across the low pressure piston such that a resonance frequency of the marine vibrator may be changed.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: March 7, 2017
    Assignee: PGS Geophysical AS
    Inventor: Nils Gunnar Olof Kröling
  • Patent number: 9534864
    Abstract: The method of controlling recoil in a disrupter comprises: providing liquid in a liquid chamber of the disrupter, the liquid chamber having a front nozzle for expelling the liquid therethrough; providing combustible propellant in a propellant chamber of the disrupter that communicates with the liquid chamber and that has a rear nozzle for expelling combustion gases therethrough; providing a bather between the liquid and the propellant to avoid admixing both; and igniting the propellant to generate expanding combustion gases that will expel the liquid out of the disrupter through the front nozzle in a first direction, either rupturing or propelling the barrier in the process, the combustion gases exhausting out of the disrupter at least partly through the rear nozzle in a second direction, with the first and second directions being at least partly opposite one another to control the recoil of the disrupter.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: January 3, 2017
    Assignee: PROPARMS LTD.
    Inventor: Rudra Kinkar Dey
  • Patent number: 9417359
    Abstract: The invention relates to a seismic node (100), comprising at least one seismic sensor with associated electronics, a primary oscillator (106) for timing sensor signals, a reference oscillator (104), a memory, a power source, a switch (102) for turning the reference oscillator on and off, and a processor (112) for digitizing sensor signals and storing them in the memory, calibrating a frequency of the primary oscillator (106) based on the frequency of the reference oscillator (104), and turning the reference oscillator on and off.
    Type: Grant
    Filed: July 30, 2013
    Date of Patent: August 16, 2016
    Assignee: MAGSEIS AS
    Inventors: Jan B. Gateman, Nils P. Gateman
  • Patent number: 9389327
    Abstract: A marine vibrator may include a containment housing, a sound radiating surface, and a compliance chamber. The compliance chamber may include a compliance chamber housing, a non-linear linkage assembly, and a low pressure chamber. The compliance chamber housing may define at least a portion of a compliance chamber internal volume having a compliance chamber internal gas pressure. The low pressure chamber may comprise a low pressure piston and a low pressure chamber housing. The low pressure chamber housing may define at least a portion of a low pressure chamber internal volume having a low pressure chamber internal gas pressure. The low pressure piston may be configured to move in response to a pressure differential across the low pressure piston such that a resonance frequency of the marine vibrator may be changed.
    Type: Grant
    Filed: May 27, 2015
    Date of Patent: July 12, 2016
    Assignee: PGS Geophysical AS
    Inventor: Nils Gunnar Olof Kröling
  • Patent number: 9075165
    Abstract: A hydrodynamic foil system for a sensor streamer array includes at least two tow ropes each coupled at one end to a survey vessel and at the other end to a paravane. the paravanes configured to provide lateral outward force as the vessel and paravanes are moved through a body of water. A spreader cable is coupled to each of the paravanes. A plurality of laterally spaced apart sensor streamers coupled at forward ends thereof to the spreader cable. A plurality of foils is disposed on the spreader cables. The foils configured to provide hydrodynamic lift in a vertical direction as the spreader cables are moved through the water.
    Type: Grant
    Filed: November 3, 2009
    Date of Patent: July 7, 2015
    Assignee: PGS Geophysical AS
    Inventors: Erling Vageskar, Kenneth Karlsen
  • Patent number: 9019797
    Abstract: Measurement data is received from first and second seismic sensors, where the first and second seismic sensors are oriented in opposite directions. Each of the first and second seismic sensors has a sensing element responsive to pressure and particle motion. The signals can be combined to remove the particle motion component of the measurement data and obtain pressure-only data. Alternatively, the signals can be combined to deghost the received measurement data.
    Type: Grant
    Filed: June 1, 2011
    Date of Patent: April 28, 2015
    Assignee: Westerngeco L.L.C.
    Inventor: Nicolas Goujon
  • Patent number: 9010484
    Abstract: A seismic source array includes a first source and a second source. The first source has a first spectral output and the second source has a second spectral output different than the first spectral output. The first source has a first total volume different than a second total volume of the second source.
    Type: Grant
    Filed: June 12, 2013
    Date of Patent: April 21, 2015
    Assignee: WesternGeco L.L.C.
    Inventors: Emmanuel Coste, Claudio Bagaini, Robert Montgomery Laws, Jon-Fredrik Hopperstad
  • Patent number: 8964501
    Abstract: A technique includes obtaining multi-component seismic data acquired by two or more seismic sensors while in tow. The multi-component seismic data is indicative of a pressure wavefield and particle motion. The technique includes based on the data, determining at least one high order (i.e., second order or higher) spatial derivative of the pressure wavefield.
    Type: Grant
    Filed: May 25, 2008
    Date of Patent: February 24, 2015
    Assignee: WesternGeco L.L.C.
    Inventors: Massimiliano Vassallo, Johan Olof Anders Robertsson, Dirk-Jan Van Manen
  • Patent number: 8910743
    Abstract: An acoustic reflector primarily for underwater use comprising a shell surrounding a core in which holes are provided in the shell to allow air and water freely to enter and leave the interior of the shell when the reflector is immersed in water. Various embodiments are described including the use of a metal shell matched to a water core, the use of a mounting bar, provision of a frame to reflect acoustically alpha numeric characters, a soluble plug to delay operation of the reflector, and coating the reflector with polyurethane to limit damage. Also proposed is a pulse pattern to improve the identification of an acoustic reflector in some circumstances. Designs of reflectors particularly suitable for use with the relatively low frequency sonars found in the fishing industry with an aluminum or aluminum alloy shell are described, as are reflectors with a non-metal shell suitable for use with the higher frequency sonars in the underwater exploration industry.
    Type: Grant
    Filed: July 11, 2011
    Date of Patent: December 16, 2014
    Assignee: Subsea Asset Location Technologies Limited
    Inventors: Carl Peter Tiltman, Andrew Malcolm Tulloch
  • Publication number: 20140238771
    Abstract: There is a method for determining a shape and structure of a piston for a vibratory seismic source element. The method includes generating a cost function J that is function of plural variables; applying plural constraints to the cost function J; calculating a piston shape and piston design that fulfills the plural constraints; and modifying the calculated piston shape and piston design based on practical implementations of the vibratory source element.
    Type: Application
    Filed: February 4, 2014
    Publication date: August 28, 2014
    Applicant: CGG SERVICES SA
    Inventors: Benoit TEYSSANDIER, Robert DOWLE, Dominique THOMAS
  • Patent number: 8773134
    Abstract: A logging tool for use in a wellbore having a sensor portion for making measurements. The tool has a sleeve enclosing the sensor portion and made of a material that is transparent to the measurements being made. One or more structural elements having physical characteristics different from the material comprising the sleeve are carried on the sleeve to enhance the mechanical properties of the sleeve.
    Type: Grant
    Filed: June 9, 2011
    Date of Patent: July 8, 2014
    Assignee: Schlumberger Technology Corporation
    Inventors: Alice Sorbier, James S. Almaguer
  • Patent number: 8770336
    Abstract: The invention concerns a device for emitting seismic waves designed to operate by being towed by a vessel, characterized in that it comprises means capable of discharging compressed air under high pressure into water, to generate a bubble (44) of a general annular shape.
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: July 8, 2014
    Assignee: CGGVeritas Services SA
    Inventors: Behzad Vahida, Thierry Payen
  • Patent number: 8687460
    Abstract: Methods and apparatus for generating borehole seismic surveys are disclosed. The methods and apparatus enable more accurate surveys than previous surveying systems. In some embodiments, firing of remote seismic sources is synchronized with data recording in a borehole. In some embodiments, the synchronization is based on a universal time standard. In some embodiments, GPS positioning technology is used to predict firing times and synchronize firing times with downhole and surface recording.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: April 1, 2014
    Assignee: Schlumberger Technology Corporation
    Inventors: Emmanuel Coste, John Richard Tulett, Hiroshi Nomura, James Edward Martin
  • Patent number: 8582395
    Abstract: A method for processing seismic data. The method includes receiving the seismic data acquired at one or more receivers due to one or more marine vibroseis sources that emit one or more vibroseis sweeps. The method then applies a receiver motion correction algorithm to the received seismic data to generate receiver motion corrected seismic data. After generating the receiver motion corrected seismic data, the method transforms the receiver motion corrected seismic data into a temporal Fourier domain to generate seismic data as a function of frequency. The method then reconstructs the transformed seismic data as a function of frequency to correct for one or more motions of the one or more marine vibroseis sources. After reconstructing the transformed seismic data, the method transforms the reconstructed seismic data to the time domain. The method then generates a seismic image of a subsurface of the Earth based on the transformed reconstructed seismic data.
    Type: Grant
    Filed: November 4, 2010
    Date of Patent: November 12, 2013
    Assignee: WesternGeco L.L.C.
    Inventor: Ralf G. Ferber
  • Patent number: 8561754
    Abstract: A marine source sub-array and method for generating a pressure wave in a body of water. The marine source sub-array includes a float configured to float in the body of water; base plates connected to the float through cables; plural individual source elements connected to the base plates and configured to generate pressure waves underwater; and a coverage plate located between the plural individual source elements and the float. The coverage plate has a surface area larger than a surface area of the float.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: October 22, 2013
    Assignee: Cggveritas Services SA
    Inventor: Yuan Ni
  • Publication number: 20130098704
    Abstract: A marine source sub-array and method for generating a pressure wave in a body of water. The marine source sub-array includes a float configured to float in the body of water; base plates connected to the float through cables; plural individual source elements connected to the base plates and configured to generate pressure waves underwater; and a coverage plate located between the plural individual source elements and the float. The coverage plate has a surface area larger than a surface area of the float.
    Type: Application
    Filed: September 7, 2012
    Publication date: April 25, 2013
    Applicant: CGGVERITAS SERVICES SA
    Inventor: Yuan NI
  • Patent number: 8427901
    Abstract: A method for seismic exploration of subsurface rock formations includes actuating an impulsive seismic energy source proximate the rock formations. A non-impulsive seismic energy source is actuated. A near field waveform of each of the impulsive and non-impulsive seismic energy sources is detected. A far field waveform of the combined output of the impulsive and non-impulsive seismic energy sources is determined from the near field waveforms. An impulse response of the subsurface rock formations is determined by deconvolving the far field waveform with detected seismic signals.
    Type: Grant
    Filed: December 21, 2009
    Date of Patent: April 23, 2013
    Assignee: PGS Geophysical AS
    Inventors: Nils Lunde, Antoni Marjan Ziolkowski, Gregory Ernest Parkes
  • Patent number: 8408355
    Abstract: A downhole tool for subsurface disposal is provided. The tool comprises an elongated tool body, an enclosure attached to an exterior surface of the tool body. The enclosure comprises at least one transducer disposed at an angle with respect to a longitudinal axis of the enclosure, and an electronics board coupled to and disposed adjacent to the at least one transducer. The enclosure also defines an internal cavity, and the internal cavity contains a fluid for insulating the at least one transducer from a downhole environment. The fluid is in direct contact with the at least one transducer and the electronics board.
    Type: Grant
    Filed: August 1, 2012
    Date of Patent: April 2, 2013
    Assignee: Schlumberger Technology Corporation
    Inventors: Miguel F. Pabon, Fernando Garcia Osuna, David B. Ayers
  • Patent number: 8353383
    Abstract: A seismic energy source includes an inlet aperture and an inlet pipe in fluid communication with an outlet of the inlet aperture at an inlet end of the inlet pipe. The inlet pipe is in fluid communication with an accumulator at an outlet end of the inlet pipe. An outlet pipe is in fluid communication with the accumulator at an inlet end of the outlet pipe and is connected to an outlet valve at an outlet end of the outlet pipe. The outlet valve is actuated by fluid pressure in the outlet pipe. An actuation pressure of the valve, and diameter, length and material properties of the outlet pipe are selected to cause a reflected water pressure wave resulting from closure of the valve to travel within the outlet pipe at a selected velocity. Motion of the seismic source through the water provides water pressure to operate the source.
    Type: Grant
    Filed: June 14, 2011
    Date of Patent: January 15, 2013
    Assignee: PGS Geophysical AS
    Inventor: Richard G Carson
  • Patent number: 8351293
    Abstract: A method for communicating between marine vessels includes the steps of connecting a communication hub and a first marine vessel via a cable; transmitting an electronic signal via the cable between the communication hub and the first marine vessel; and transmitting the electronic signal wirelessly between the communication hub and a second marine vessel. The cable may be a seismic cable such as, and without limitation to, a streamer and an ocean bottom cable. The seismic cable may include one or more seismic sensors such as hydrophones and geophones.
    Type: Grant
    Filed: February 16, 2010
    Date of Patent: January 8, 2013
    Assignee: WesternGeco L.L.C.
    Inventor: Svein Arne Frivik
  • Publication number: 20120318604
    Abstract: A seismic energy source includes an inlet aperture and an inlet pipe in fluid communication with an outlet of the inlet aperture at an inlet end of the inlet pipe. The inlet pipe is in fluid communication with an accumulator at an outlet end of the inlet pipe. An outlet pipe is in fluid communication with the accumulator at an inlet end of the outlet pipe and is connected to an outlet valve at an outlet end of the outlet pipe. The outlet valve is actuated by fluid pressure in the outlet pipe. An actuation pressure of the valve, and diameter, length and material properties of the outlet pipe are selected to cause a reflected water pressure wave resulting from closure of the valve to travel within the outlet pipe at a selected velocity. Motion of the seismic source through the water provides water pressure to operate the source.
    Type: Application
    Filed: June 14, 2011
    Publication date: December 20, 2012
    Applicant: PGS Geophysical AS
    Inventor: Richard G. Carson
  • Patent number: 8261874
    Abstract: A method for attenuating out of band energy emitted from a seismic source used in a marine seismic survey. The method includes disposing the seismic source in a body of water and releasing a gas into a volume of water surrounding the seismic source. The released gas may be configured such that it displaces the volume of water surrounding the seismic source at a rate less than 2.9×106 cubic-meters per cubic-second.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: September 11, 2012
    Assignee: WesternGeco L.L.C.
    Inventors: Jon-Fredrik Hopperstad, Robert Laws, Julian Edward (Ed) Kragh
  • Patent number: 8256565
    Abstract: An enclosure for housing a transducer and electronics for disposal on a downhole tool. A transducer is disposed at an angle with respect to a longitudinal axis of the enclosure, wherein the enclosure contains a fluid surrounding the transducer. Enclosures also include transducers linked to motor means for selective rotation of the transducers within the enclosure. Enclosures with transducer arrays for phased or targeted signal transmission/detection.
    Type: Grant
    Filed: April 18, 2006
    Date of Patent: September 4, 2012
    Assignee: Schlumberger Technology Corporation
    Inventors: Miguel F. Pabon, Fernando Garcia Osuna, David B. Ayers
  • Patent number: 8233801
    Abstract: A subsea monitoring system.
    Type: Grant
    Filed: August 18, 2008
    Date of Patent: July 31, 2012
    Assignee: Vetco Gray Inc.
    Inventors: Daniel Sexton, John Erik Hershey, John Carbone, Lynn Ann Derose, John Anderson Ross, Todd Tolliver, Michael Dell'Ano
  • Patent number: 8205711
    Abstract: A seismic source array 15 comprises a plurality of seismic source 26 arranged about a central point of the source array 15 in such a way that an imaginary circle drawn with said central point at its center, and containing all of said seismic sources 26, can be divided into at least three whole sectors each of which contains a substantially identical arrangement of seismic sources 26.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: June 26, 2012
    Assignee: WesternGeco L.L.C.
    Inventors: Jon-Fredrik Hopperstad, Johan-Fredrik Synnevaag, Pieter Leonard Vermeer
  • Patent number: 8136625
    Abstract: A method for attenuating out of band energy emitted from a seismic source used in a marine seismic survey. The method includes disposing the seismic source in a body of water and releasing a gas into a volume of water surrounding the seismic source. The released gas may be configured such that it displaces the volume of water surrounding the seismic source at a rate less than 2.9×106 cubic-meters per cubic-second.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: March 20, 2012
    Assignee: WesternGeco L.L.C.
    Inventors: Jon-Fredrik Hopperstad, Robert Laws, Julian Edward (Ed) Kragh
  • Patent number: 8094514
    Abstract: A method for generating seismic energy for subsurface surveying includes operating a first seismic vibrator and operating at least a second seismic vibrator substantially contemporaneously with the operating the first seismic vibrator. A driver signal to each of the first and the at least a second seismic vibrators that are substantially uncorrelated with each other.
    Type: Grant
    Filed: November 7, 2008
    Date of Patent: January 10, 2012
    Assignee: PGS Geophysical AS
    Inventor: Stig Rune Lennart Tenghamn
  • Patent number: 7997179
    Abstract: A hybrid water cannon that can be configured in either a recoil mode or recoilless mode. A first barrel is attached to a breech block. Either a second barrel or breech plug is also attached to the breech block on a side opposite the first barrel. With the breech plug attached, the water cannon is in a recoil mode. With the second barrel attached, the water cannon is in a recoilless mode. A chamber containing a propellant charge is in communication with both the first and second barrels. Upon ignition, the propellant charge pushes a charge of water from both barrels simultaneously and in opposite directions. The discharge from the first barrel is used to disable the target ordnance. The discharge from the second barrel counters the recoil. The propellant charge is ignited using an ignition charge in a port intersecting the chamber at an angle other than 90 degrees.
    Type: Grant
    Filed: April 1, 2008
    Date of Patent: August 16, 2011
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: David A. Nelson, David Smith, Scott Strohman, Ken Poe
  • Patent number: 7974150
    Abstract: Methods and apparatus for controlling seismic source firings are disclosed. The methods and apparatus enable firing of seismic sources to increase pressure wave amplitude. Some methods and apparatus reduce ghosting and align first pressure peaks of multiple seismic sources. The multiple seismic sources may be fired sequentially according to active feedback mechanisms. Controlling the firing of the seismic source facilitates more accurate seismic data and a more consistent seismic source signature.
    Type: Grant
    Filed: October 26, 2006
    Date of Patent: July 5, 2011
    Assignee: Schlumberger Technology Corporation
    Inventors: John Richard Tulett, James Edward Martin
  • Patent number: 7974152
    Abstract: A method for controlling output of a marine seismic vibrator includes operating the vibrator using a predetermined driver signal. A vibrator output signal is measured at at least two different places on the vibrator. The at least two measured vibrator output signals are used to determine a corrected driver signal, wherein the corrected driver signal results in fewer harmonics of fundamental frequencies in the vibrator output. The vibrator is operated using the corrected driver signal.
    Type: Grant
    Filed: June 23, 2009
    Date of Patent: July 5, 2011
    Assignee: PGS Geophysical AS
    Inventor: Stig Rune Lennart Tenghamn
  • Patent number: 7913806
    Abstract: A measurement package for disposal on an apparatus such as a downhole tool or a tool like device. The measurement package including an enclosure, a first acoustic transducer housed within the enclosure, a second acoustic transducer housed within the enclosure and electronics housed within the enclosure that is in communication with the first and second transducers. Further, an acoustic transmitter and receivers can be disposed at an angle with respect to a longitudinal axis of the enclosure. The enclosure can contain attenuative material surrounding the transmitter and receivers, and electronics for controlling the transmitter and receivers and communicating with the downhole tool.
    Type: Grant
    Filed: February 25, 2009
    Date of Patent: March 29, 2011
    Assignee: Schlumberger Technology Corporation
    Inventors: Miguel F. Pabon, Fernando Garcia Osuna, David B. Ayers
  • Patent number: 7679994
    Abstract: Seismic sensor systems and sensor station topologies, as well as corresponding cable and sensor station components, manufacturing and deployment techniques are provided. For some embodiments, networks of optical ocean bottom seismic (OBS) stations are provided, in which sensor stations are efficiently deployed in a modular fashion as series of array cable modules deployed along a multi-fiber cable.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: March 16, 2010
    Assignee: Optoplan AS
    Inventors: Erlend Ronnekleiv, Ole Henrik Waagaard, Hilde Nakstad, Arne Berg, Jon Thomas Kringlebotn
  • Publication number: 20100060901
    Abstract: An acoustic field in a body of water is monitored using a coherent light field emitter applying a distributed light field across the surface of the water to be reflected, and a sensor is used to sense reflected components of the light field above the surface and to provide a signal representing information in the reflected light and related to movements in the water and caused by the acoustic field. The signal is provided from an interferometry technique and useable to derive information on the underwater acoustic field in a useful form.
    Type: Application
    Filed: May 10, 2007
    Publication date: March 11, 2010
    Inventors: Barry John Martin, John Chester Wendoloski
  • Patent number: 7632043
    Abstract: A method and apparatus for storing, transporting, and transferring one or more sensor devices is described. In one embodiment, the apparatus includes a transfer device having a frame, and a movable platform coupled to the frame. A mesh material may be coupled to the frame and surround at least one side of the movable platform and a mating interface is formed in a side of the frame that is adapted to couple with a remotely operated vehicle in an underwater location.
    Type: Grant
    Filed: August 23, 2007
    Date of Patent: December 15, 2009
    Assignee: Fairfield Industries Incorporated
    Inventors: James N. Thompson, Reagan N. Woodard, Jr., Clifford H. Ray
  • Patent number: 7603950
    Abstract: A piezo cable is provided as an impact sensor, which allows up to four different measuring principles. In addition to the piezoelectric measurement, which causes a piezoelectric pulse in an impact, a capacitive measurement, an inductive measurement and a resistance measurement are possible.
    Type: Grant
    Filed: March 13, 2004
    Date of Patent: October 20, 2009
    Assignee: Robert Bosch GmbH
    Inventor: Anton Dukart