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| Number | Title | Issue Date |
| 8079440 | Determining the polarity of movement of an actuator mass in a seismic vibrator A technique or mechanism for use with a vibrator to be employed for subterranean surveying includes receiving, from a sensor, a unipolar indication of movement of an actuator mass of the vibrator. According to the indication from the sensor, a correlation is determi... | 12/20/2011 |
| 8061471 | Seismic vibrator controlled by directly detecting base plate motion A seismic vibrator has a base plate with at least four isolators isolating a frame from the base plate. Each of these isolators is offset from the plate's footprint on shelves to free up area on the plate's top surface. An accelerometer disposed directly on the base... | 11/22/2011 |
| 7926614 | Particle motion sensor mounting for marine seismic sensor streamers A marine seismic streamer includes a jacket substantially covering an exterior of the streamer. At least one strength member is disposed along the length of the jacket. A sensor mount is coupled to the strength member. At least one particle motion sensor is suspende... | 04/19/2011 |
| 7918307 | Accelerated weight drop for use as a seismic energy source and a method of operation thereof The present invention provides an accelerated weight drop for use as a seismic energy source, a method for operating an accelerated weight drop for use as a seismic energy source, and a seismic survey system including the accelerated weight drop. The accelerated wei... | 04/05/2011 |
| 7841444 | Seismic vibrator baseplate One example of a seismic vibrator system includes a baseplate having a bottom surface and a coupling mechanism, the coupling mechanism being operable to a deployed position; a hold-down mass connected to the baseplate; a lifting mechanism in operational connection w... | 11/30/2010 |
| 7650962 | Rotary actuated seismic source and methods for continuous direct-push downhole seismic testing Remotely operated rotary actuated shear wave generating apparatus and methods that generate horizontally polarized vertically propagating shear waves for use in down-hole shear wave velocity measurements. Seismic signals are generated by an offset mass rotating in a... | 01/26/2010 |
| 7617908 | Downhole seismic source Elastodynamic waves are generated by a tool having a hammer rotatably connected with a housing by a first hinge and an actuator arm rotatably connected with the hammer by a second hinge. An axial force applied to the actuator arm by a drive shaft and spring is trans... | 11/17/2009 |
| 7562740 | Borehole acoustic source The present invention discloses an acoustic borehole source and method of using the source for generating elastic waves through an earth formation that may be used for logging or permanent installations. The acoustic source is comprised of a first motorized reaction... | 07/21/2009 |
| 7467685 | Array seismic fluid transducer source An apparatus for generating a seismic signal in a wellbore includes an elongated housing configured to be disposed in the wellbore; a piston slidably disposed in an internal bore in the elongated housing; a strike plate fixed on the elongated housing proximate one e... | 12/23/2008 |
| 7441628 | Wellbore 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 |
| 7424928 | Apparatus, 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 |
| 7395897 | Accelerated weight drop configurable for use as a shear wave seismic energy source and a method of operation thereof The present invention provides an accelerated weight drop for use as a seismic energy source, a method for operating an accelerated weight drop for use as a seismic energy source, and a seismic survey system including the accelerated weight drop. The accelerated wei... | 07/08/2008 |
| 7377357 | Marine seismic acquisition method and apparatus A marine seismic source method capable of retaining low frequencies is disclosed. One embodiment of the method comprises a seismic source that generates an up-going wave and first down-going wave with opposite polarity. The up-going wave reflects off the ocean surfa... | 05/27/2008 |
| 7373976 | Well production optimizing system A method and system for controlling a producing cycle in a well, during the production cycle, for optimizing production from the well including disrupting fluid in a wellbore with a pulse generator to create a pressure pulse transmitted through the fluid in the well... | 05/20/2008 |
| 7364008 | System for imparting mechanical impulse energy to the ground The invention relates to an apparatus and method for imparting a precise amount of impulse energy to be delivered to the ground. The apparatus includes an anvil for operative deployment against the earth a hammer operatively connected to the anvil for striking the a... | 04/29/2008 |
| 7357030 | Apparatus and methods for determining at least one characteristic of a proximate environment Methods and an apparatus for determining at least one characteristic of an environment are disclosed. A vibrational energy may be imparted into an environment and a magnitude of damping of the vibrational energy may be measured and at least one characteristic of the... | 04/15/2008 |
| 7318489 | Hydraulic motor arrangement and method of operating a hydraulic motor A hydraulic motor for use in subterranean drilling operations in which a drive fluid within a first reservoir is forced through the motor by a high pressure working fluid, such as drilling mud, the drive fluid entering a second reservoir upon exiting the motor. Upon... | 01/15/2008 |
| 7284636 | Accelerated weight drop for use as a seismic energy source and a method of operation thereof The present invention provides an accelerated weight drop for use as a seismic energy source, a method for operating an accelerated weight drop for use as a seismic energy source, and a seismic survey system including the accelerated weight drop. The accelerated wei... | 10/23/2007 |
| 7278513 | Internal lens system for loudspeaker waveguides This invention provides a lens system for a loudspeaker. The loudspeaker may include a driver unit and a waveguide attached to the driver unit. The loudspeaker further may include a lens system. The lens system may include a plurality of plates. The plates may be po... | 10/09/2007 |
| 7216738 | Acoustic stimulation method with axial driver actuating moment arms on tines A method for generating acoustic waves, the method having the steps of: extending a tine from a support structure so that a proximal end of the tine is attached to the support structure and a distal end of the tine is uninhibited; positioning an oscillator so as to ... | 05/15/2007 |
| 7213681 | Acoustic stimulation tool with axial driver actuating moment arms on tines An apparatus for generating acoustic waves, the apparatus having: a support structure; two tines extending from the support structure so that proximal ends of the two tines are attached to the support structure so that distal ends of the two tines are positioned wit... | 05/08/2007 |
| 7210555 | Low frequency acoustic attenuator for use in downhole applications An acoustic attenuator includes a housing having an inner side surface which defines an interior chamber and at least one dampening member both physically and acoustically coupled to the housing and projecting into the interior chamber. Acoustic energy propagating w... | 05/01/2007 |
| 7182170 | Gerotor 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 |
| 7178626 | Method 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 |
| 7104357 | Device for generating focused elastic waves in a material medium such as underground, and method using same An electromechanical device for generating elastic waves in a material medium such as the subsoil in a frequency range where the wavelengths of the waves generated are great in view of the dimensions of the device, and method of implementation. The device comprises ... | 09/12/2006 |
| 7082831 | Measurement of base and subgrade layer stiffness using bender element technique The present invention relates to a device and method for measuring the stiffness of base and subgrade layers of soil. The device is a penetrometer comprising first and second spaced apart cone penetrometer shafts. A first of the cone penetrometer shafts is fitted wi... | 08/01/2006 |
| 6851511 | Drive assembly for acoustic sources In one embodiment of the present invention, a drive assembly for a seismic land vibrator is provided. The drive assembly comprises at least a first spring element. The first spring element operates in at least two vibration modes in a seismic frequency band of inter... | 02/08/2005 |
| 6831877 | System and method for determining an azimuth of a seismic energy source The present invention provides a system for, and method of determining an azimuth of a seismic energy source. In one embodiment, the system includes a directional assembly having a mount configured to be coupled to a seismic energy source, a rotatable mass assembly ... | 12/14/2004 |
| 6561310 | Method and apparatus for measuring seismic energy imparted to the earth A non-contact vibrometer is employed to measure seismic energy imparted to the earth by a land vibrator. The non-contact vibrometer can be a laser vibrometer operable to measure the motion of a baseplate of the land vibrator. A computing device can be use... | 05/13/2003 |
| 6488117 | Vertical-force vibrator seismic wave source A dynamic force transducer for generating vertically oriented compressional forces and motions at the surface of a solid medium. A frame is rigidly coupled in direct contact with the solid medium surface. At least one pair of identical driver units are mo... | 12/03/2002 |
| 6474439 | Dipole logging tool A logging tool having a tool body, which can be positioned in a fluid-filled borehole, including a receiver section and a dipole transmitter; wherein the dipole transmitter includes a transducer with a shell having a reaction mass and a motor located ther... | 11/05/2002 |
| 6394221 | Swept impact seismic technique and apparatus A method of seismic investigation using the swept impact seismic technique involves measuring the response of a site to be investigated to a series of controlled impact sequences applied at different points of the site, each sequence using impacts generat... | 05/28/2002 |
| 6338394 | Compact vibrator and seismic monitoring or prospecting method using such a vibrator Compact vibrator for emitting elastic waves in a material medium such as the subsoil. The vibrator comprises a baseplate (3) intended to be coupled in operation with a surface of this medium, an inertia mass (5) and at least a pair of electromechanical tr... | 01/15/2002 |
| 6173803 | High amplitude sound wave generator A method and device for generating a high amplitude sound wave is provided. The device includes a housing having an open end. A piston is slidably disposed in the open end of the housing and forms a chamber for holding a pressurized liquid. The pressurize... | 01/16/2001 |
| 6119804 | Horizontally polarized shear-wave vibrator seismic source A dynamic force transducer for generating horizontally oriented shear forces and motion at a surface of a solid medium. A rigid frame is placed in direct contact with the surface of the solid medium. At least one pair of identical dynamic-force driver uni... | 09/19/2000 |
| 6105712 | Method for generating seismic shearing waves in a subterranean formation Method for generating seismic intersection waves in an underground formation, wherein poles that are previously driven into the formation for other purposes or poles that are driven down for this purpose, said poles being used as a transfer medium for the... | 08/22/2000 |
| 6065562 | System for imparting compressional and shear waves into the earth A seismic vibrator system for imparting compressional and shear wave vibrations into the earth has an earth contacting base with a vertical post. A tubular hub is slidably received on the post in a piston/cylinder relationship. Spaced apart horizontal top... | 05/23/2000 |
| 5992559 | Reversible polarity borehole seismic device for P and enhanced S-wave crosshole testing A seismic source for crosshole testing comprises a hammer rod supported by axial bearings in the ends of a cylindrical housing. Fasteners attach a down-blow hammer to the hammer rod inside the housing. A helical spring inside the housing biases the hammer... | 11/30/1999 |
| 5969297 | Pulse generator powered vibrator An apparatus for generating signals and energy for transmission to a large mass. The apparatus incorporates a pulsed generator such as a compensated pulsed alternator for storing and for discharging large amounts of energy in a controlled manner for trans... | 10/19/1999 |
| 5786537 | Vibratory ground-survey system A rotary vibrating system is used in surveys of the acoustic properties of the shallow earth. The vibrator itself is of eccentric-mass (or "swinging-weight") form. Coupled to a flywheel, it decelerates freely from a selected high frequency to a selected l... | 07/28/1998 |
