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Class 181/112 - Plural detectors


Subclass of Class 181 - Acoustics
Definition: Subject matter wherein the means for receiving seismic waves
No. of patents: 133
Last issue date: 10/28/2008


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NumberTitleIssue Date
7441628Wellbore signal generator
Methods and apparatus for generating a signal with a signal generator comprising a tool body disposed in a tubular member. A first and second electromagnets are disposed within the tool body such that the second electromagnet is opposite the first electromagnet. A p...
10/28/2008
7424928Apparatus, system and method for flexibly coupling sensors to a downhole tool
A downhole receiver for gathering seismic and sonic data from inside a borehole includes a substantially tubular housing adapted for axial connection to a tool string, and one or more sensors. A damping element is provided to flexibly couple each sensor to the tubul...
09/16/2008
7426439Method and apparatus for marine seismic data acquisition
The present invention provides a method and apparatus for seismic data acquisition. One embodiment of the method includes accessing data acquired by at least two particle motion sensors. The data includes a seismic signal and a noise signal and the at least two part...
09/16/2008
7364007Integrated acoustic transducer assembly
Acoustic transducers configured with integrated electronics technology are adapted to digitize signal data close to the transducer. The transducers are packaged with a reduced number of elements and sealed for exposure to harsh environments, without oil compensation...
04/29/2008
7348894Method and apparatus for using a data telemetry system over multi-conductor wirelines
A data telemetry system for multi-conductor wirelines to enhance transmission of analog and digital signals with frequency content up to 100 kHz by assigning at least two conductors to a first terminal of a data transmittal means and to a first terminal of a data re...
03/25/2008
7339852Seismic acquisition system
A seismic acquisition system comprising a remote-controlled buoy for conducting seismic acquisition operations. The buoy comprises an operating system for operating a seismic wave production device on the buoy, a placement system, a communications system, and dynami...
03/04/2008
7334661Acoustic logging tool sleeve
An acoustic logging tool sleeve with a preferably discontinuous, alternating structure that is acoustically opaque in some zones, and acoustically transparent in others. The sleeve may be modular, with several stages connected together. The multiple stages provide a...
02/26/2008
7325647Mobile system for seismic emission with fixed coupling devices, and method therefor
Seismic emission system for use in an underground formation, using at least one seismic source movable successively in a plurality of prepared activation locations and method for implementing same. The system comprises for example a plurality of coupling devi...
02/05/2008
7324406Sensor arrangement for seismic waves
A sensor arrangement is provided for use in the seismic investigation of geological formations below the seabed. A plurality of sensor nodes (20) are provided and are positioned gfor deployment on the seabed to collect pressure waves and shear waves from the ...
01/29/2008
7292501Compact shooter localization system and method
Systems and methods for locating the shooter of supersonic projectiles are described. Muzzle blast signals are neither sought nor required. The system uses at least two sensors, with each sensor having a 3-axis accelerometer. The sensors are spaced apart at least 1 ...
11/06/2007
7260021Method of harmonic noise attenuation in correlated sweep data
The present invention provides a method for harmonic noise attenuation in correlated sweep data in seismic exploration. The method includes forming a plurality of correlation data subsets using a plurality of sweep data sets and a correlation reference sequence. The...
08/21/2007
7257489Quadrupole acoustic shear wave logging while drilling
A tool generates signals indicative a shear wave slowness of the formation surrounding a borehole. The tool comprises a collar portion adapted for mounting in a drill string, a quadrupole sonic transmitter mounted to the collar portion, and a quadrupole sonic receiv...
08/14/2007
7254199Location-estimating, null steering (LENS) algorithm for adaptive array processing
An adaptive multiple-tap frequency domain digital filter processes an input signal vector X from an plurality of spatially separated transducers that detect energy from a plurality of sources including a target energy source and at least one non-target energy source...
08/07/2007
7210556Method and apparatus for installing a sensor array
An apparatus and method is provided for transporting, installing, retrieving, and replacing a sensor array of individual sensor pods at a geographically remote location, such as on the sea floor. The apparatus consists of a remotely operated vehicle (ROV), a carouse...
05/01/2007
7182170Gerotor and bearing system for whirling mass orbital vibrator
A gerotor and bearing apparatus for a whirling mass orbital vibrator which generates vibration in a borehole. The apparatus includes a gerotor with an inner gear rotated by a shaft having one less lobe than an outer gear. A whirling mass is attached to the shaft. At...
02/27/2007
7178627Methods for use in detecting seismic waves in a borehole
The invention provides methods and apparatus for detecting seismic waves propagating through a subterranean formation surrounding a borehole. In a first embodiment, a sensor module uses the rotation of bogey wheels to extend and retract a sensor package for selectiv...
02/20/2007
7178626Method of seismic evaluation of subterranean strata
A method of conducting seismic evaluation of a subterranean formation wherein a rigid, elongate member having a first end and a second end is positioned such that the first end of the elongate member is at a point on the earth's surface, imparting an impulsive force...
02/20/2007
7167413Towed streamer deghosting
Apparatus and methods for reducing ghosts from hydrophone signals in a streamer towed underwater close to the sea surface. A multi-axis micro-electro-mechanical-system (MEMS) accelerometer with attitude sensing is used to reduce the frequency spectral notch in the r...
01/23/2007
7140435Optical fiber conveyance, telemetry, and/or actuation
Methods and apparatus comprise a conveyance structure to carry a tool into a wellbore. The conveyance structure contains an optical fiber line to enable communication between the tool and well surface equipment. In one implementation, the conveyance structure compri...
11/28/2006
7104728Method for deploying seafloor equipment
A method for deploying and retrieving seafloor equipment modules is disclosed. A conveyor has a fixed end and a free end. The conveyor is deployed into a body of water until the free end reaches, or is proximate to, the seafloor. The conveyor is dragged through the ...
09/12/2006
7051808Seismic monitoring of in situ conversion in a hydrocarbon containing formation
In an embodiment, a system may be used to heat a hydrocarbon containing formation. The system may include a conduit placed within an opening in the formation. A conductor may be placed within the conduit. The conductor may provide heat to a portion of the formation....
05/30/2006
7048089Methods and apparatus for use in detecting seismic waves in a borehole
The invention provides methods and apparatus for detecting seismic waves propagating through a subterranean formation surrounding a borehole. In a first embodiment, a sensor module uses the rotation of bogey wheels to extend and retract a sensor package for selectiv...
05/23/2006
7026951Data telemetry system for multi-conductor wirelines
An improved data telemetry system for multi-conductor wirelines to achieve satisfactory transmission of analog and digital signals with frequency content up to 100 kHz by assigning at least two conductors to a first terminal of a data transmittal means and to a firs...
04/11/2006
7027925Adaptive borehole assembly visualization in a three-dimensional scene
A method for displaying a bottom-hole assembly together with a borehole trajectory includes displaying the borehole trajectory in a display window; and displaying the bottom-hole assembly in the display window such that the borehole trajectory and the bottom-hole as...
04/11/2006
7016262Seismic sensor
A seismic sensor, comprising a case, a pre-charged, non-conductive membrane located between two plates that form a capacitor and accommodated inside the case, with one of the plates being immovable relative to the case and the other of the plates being movable relat...
03/21/2006
7013217System and method for determining formation slowness
The invention provides techniques for calculating velocity from sonic signals with an improved signal to noise ratio, accuracy and certainty of result. Multichannel coherence measures are calculated from sonic transmitter signals and averaged to produce an average c...
03/14/2006
7003402Method of processing data
A method of processing data sequences obtained at substantially the same time at locations spatially separated from one another is disclosed. A sequence indicative of a measure of spread of the data sequences or of selected data sequences is determined. A common sig...
02/21/2006
6992951Permanent seafloor seismic recording system utilizing micro electro-mechanical systems seismic sensors and method of deploying same
Provided is a permanent seafloor seismic recording system utilizing Micro Electro-Mechanical Systems seismic sensors. The system includes and expandable backbone, multiple hubs and sensor lines. The sensor lines include multiple sensor modules that include 3-C accel...
01/31/2006
6977867Seismic data acquisition system
A seismic survey system having remote acquisition modules (RAMs) for acquiring seismic signals and communicating with a central recording system (CRU) via a network of cables, other RAMs, and line tap units (LTUs), arranged in a matrix of receiver lines and base lin...
12/20/2005
6961283Adaptive filtering apparatus and method for seismic data acquisition
The present invention provides an adaptive filtering method for substantially eliminating ground roll noise encountered during seismic data acquisition. An apparatus for acquiring seismic data is provided that includes an adaptive filtering circuit coupled to a mult...
11/01/2005
6956790Borehole sonic data processing method
A method of processing sonic wireline or logging while drilling data acquired in a borehole that includes filtering the sonic data to attenuate tool-borne and borehole-borne arrivals; migrating the filtered sonic data; and beamforming the filtered and migrated sonic...
10/18/2005
6932185Acquisition method and device for seismic exploration of a geologic formation by permanent receivers set on the sea bottom
A method and device for seismic exploration of a subsea geologic formation by pickups set on the sea bottom and intermittently connectable to active data acquisition stations (11) brought nearby. Permanent passive reception stations (1) comprising a he...
08/23/2005
6930616Method and apparatus for LWD shear velocity measurement
Array quadrupole data obtained in a LWD environment are processed to determine the shear velocity of an earth formation taking into account dispersion effects caused by the logging tool. When this processing is done in an azimuthally anisotropic formation, the shear...
08/16/2005
6909666Method and apparatus for generating acoustic signals for LWD shear velocity measurement
An acoustic logging apparatus comprises a drill collar conveyed on a drilling tubular in a borehole within a formation. At least one transmitter is disposed in the drill collar. The transmitter includes at least one magnetostrictive actuator cooperatively coupled by...
06/21/2005
6883638Accelerometer transducer used for seismic recording
Method for operating and testing a sensor assembly (210). The sensor assembly (210) preferably includes accelerometers with axes of sensitivity orthogonal to each other. The method preferably includes determining sensor tilt angle, determining the posi...
04/26/2005
6837332Method and apparatus for cancellation of unwanted signals in MWD acoustic tools
An apparatus (10) and method are disclosed for eliminating a noise signal from at least one source during an acoustic measurement of a subsurface geological formation or borehole. The apparatus (10) includes a longitudinal body for positioning in the b...
01/04/2005
6814179Seismic sensing apparatus and method with high-g shock isolation
A method and apparatus for isolating a seismic sensor module from high-g shock loads such as those encountered during handling, deployment and retrieval of the module. The sensor module includes one or more MEMS accelerometers in an electronics package. The electron...
11/09/2004
6786297System for acquiring geophysical data
A module is described for acquiring geophysical signals. The module includes at least one casing which is individually linked to one track. Each casing houses a processor which operates to digitize the geophysical signals. The module further includes two cable secti...
09/07/2004
6739423Acoustic logging tool
A sleeve for an acoustic logging tool has a structure with a window section having fewer bars than a conventional sleeve separated by a slotted region with thin circumferential slots which are stress-relieved at the ends (“dumb-bell” shaped). Steel receiver moun...
05/25/2004
6678207Trapped water bottom multiple and peg-leg multiple suppression for ocean bottom seismic data
The invention is a method for removing trapped water bottom multiples, receiver side peg-leg multiples, and source side peg-leg multiples from dual sensor OBC data, where the data includes both pressure signals and velocity signals. The pressure and veloc...
01/13/2004
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