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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...
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7175499 |
Method for creating controlled pressure release in a pneumatic device
The present invention provides a means for holding the components of the device, a means for storing gas under pressure which is maintained separately from the interior of the device until...
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7028807 |
Non-explosive acoustic source
A non-explosive acoustic source utilizes the combustion of aluminum and water to generate an acoustic pulse. The operation of the non-explosive acoustic source relies on a water/aluminum reaction...
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6973993 |
Methods and apparatus of suppressing tube waves within a bore hole and seismic surveying systems incorporating same
Methods and apparatus for attenuating waves in a bore hole, and seismic surveying systems incorporating the same. In one embodiment, an attenuating device includes a soft compliant bladder coupled...
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6571906 |
Underwater sound mitigation system for explosive testing
A sound mitigation system and method reduce the transmission of acoustic output from explosions underwater. The system is submerged to bottom terrain of a body of water and has at a series of...
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6478107 |
Axially extended downhole seismic source
An axially extended downhole seismic source is disclosed. In one embodiment, the seismic source includes multiple pressure storage chambers, each having an inlet valve and an outlet valve. The...
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6076630 |
Acoustic energy system for marine operations
A marine seismic source for generating acoustic source energy. A housing has a continuous exterior perimeter which is moveable to displace water. Movement of the housing can be accomplished by...
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6076629 |
Low frequency flextensional acoustic source for underwater use
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5991235 |
Seismic data imaging system
A system for seismic prospecting by using reflections of acoustic waves and an operation method thereof. Unprocessed raw data from a plurality geophone sensors and other processed data are stored...
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5834710 |
Acoustic pulse gun assembly
A gas gun is provided for generation of an acoustic pulse and subsequent detection of return reflections from the annulus of a well. The system includes a gas gun and a hand-held gas source. The...
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5491306 |
Mass oscillator having an adjustable gas spring
An apparatus for oscillating a mass at a plurality of selective frequencies includes a source of compressible fluid and a cylinder having a bore filled with the compressible fluid. The cylinder...
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5467322 |
Water hammer driven vibrator
The invention provides apparatus for shaking structures such as fins in a fluid agitator, shaking tables, shaking screens, conveyors, or the walls of bins or hoppers. The apparatus is driven by a...
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5459699 |
Method and apparatus for generating high energy acoustic pulses
A method and apparatus are disclosed for generating intense acoustic pulses by means of the water hammer effect. The method involves generating a water hammer in a conduit by suddenly interrupting...
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5399816 |
Seismic source
A subsurface seismic source for generating seismic waves comprises a fluid supply conduit section conducting fluid downward and having a seat for receiving a blocking body transported by said...
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5270985 |
Seismic pulse generation
An acoustic wave energy generator comprises a body having an internal gas-pressurisable first chamber 1 adjoining a second chamber 2 into which a liquid is introduced to cover a vibratable means 4...
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5189263 |
Human-portable geophysical energy source
A human-portable geophysical energy source is disclosed having an earth-coupling element, a means for providing seismic energy operably connected to that earth-coupling element, a lower container...
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5160814 |
Hydraulically-actuated downhole seismic source
Seismic signals are generated in an earth formation at a selected point in a wellbore by apparatus insertable in the wellbore at the distal end of a tubing string. The apparatus is adapted to...
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5063542 |
Piezoelectric transducer with displacement amplifier
A displacement amplifier interconnects a piezoelectric actuator with a displacement member and comprises respective bellows members of differential diameter defining first and second expansible...
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5018598 |
Apparatus for generating seismic waves
Disclosed is an apparatus for generating seismic waves in a well bore, which apparatus includes a tubular expandable and contractible outer anchor wall, a seslf-contained anchor setting hydraulic...
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4982811 |
Fluid driven torsional dipole seismic source
A compressible fluid powered oscillating downhole seismic source device capable of periodically generating uncontaminated horizontally-propagated, shear waves is provided. A compressible fluid...
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4959818 |
Apparatus for generating elliptically polarized shear waves
Apparatus for generating a controlled parameter elliptically polarized shear wave into an earth medium. The apparatus consists of a baseplate for engagement with the earth medium in...
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4871045 |
Telescoping tube omni-directional shear wave vibrator
Apparatus including transportation structure for generating elliptically polarized shear waves in soft earth medium. A suitable carrier includes a jack assembly for transporting shear wave...
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4869338 |
Method for measuring acoustic impedance and dissipation of medium surrounding a borehole
The invention is the use of standing waves to generate a well log. By measuring changes in energy dissipation from the standing wave along the well-bore, the formation may be evaluated for...
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4862990 |
Downhole seismic sources
A downhole seismic signal source (vibrational or impulsive) capable of producing a signal of sufficiently high energy to permit the tool to be used in a deep wellbore (exceeding 4000 feet). A...
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4853907 |
Inclinable vibratory seismic source
An improved inclinable vibratory seismic source arranged to be vehicle mounted including a base plate mounted for movement relative to the vehicle frame and for engagement with the ground....
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RE32995 |
Variable cylinder hydraulic vibrator and control system
Apparatus for incremental cylinder length control in hydraulic seismic vibrators having increased frequency range. The vibrator apparatus (10) of the type having a reaction mass (38) and axial...
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4815557 |
Down hole seismographic source
A seismic energy source provides a bias pressure and oscillating pressure force on a piston mounted transversely to the major axis of the well bore and in pressure contact with the wall of the well...
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4796723 |
System for transmitting energy through an apparatus usable for subsoil prospection, lowered inside a well or drill hole
A system is provided for transmitting energy to an apparatus, such as a pulsed or vibratory seismic source, lowered inside a well or drill hole. It includes a structure anchorable in a well, mobile...
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4785430 |
Hydraulic vibrator with wide dynamic range
Vibrator apparatus having adjustable cylinder volume by means of a continuously adjustable end sleeve that varies the axial limit of the cylinder. A reaction mass with an axial cylinder bore...
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4770269 |
Closed air system seismic wave generator
Apparatus for generating seismic waves including an upstanding hollow cylindrical housing within which an impact piston latched in a cocked position is adapted to be propelled downwardly by high...
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4766974 |
Seismic signal generator with a self-expanding vibrator support base
A seismic signal generator with a self-adjusting footprint base plate. A signal generator for use on paved or other hard surfaces, has a pair of tread members (preferably urethane) that are...
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4754443 |
Airgun having shaft-bearing-guided shuttle and capable of fast repitition self-firing
An airgun impulsive energy source has an elongated shaft bearing surrounding the shaft of the reciprocatable shuttle for guiding the shuttle and preventing its operating or firing pistons from...
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4739859 |
Method and apparatus for reducing the stretch of an elastomeric diaphragm of a land seismic source
A land seismic energy source is provided having a rigid dome-shaped bell containing a substantially imcompressible liquid and an airgun for abruptly releasing pressurized gas into the liquid for...
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4722417 |
Seismic wave generation by a downhole source
A method and apparatus for downhole source generation of seismic waves of adjustable frequency by isolating a volume of liquid in a bore hole and cyclically varying the volume by a hydraulically...
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4719607 |
Full wave field vibratory seismic source
A vibratory seismic surface source includes a single vibrating mass, the energy of which is coupled to the earth through a ground contacting base plate. Means are provided for varying the...
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4712641 |
Method and system for generating shear waves and compression waves in the earth for seismic surveying
A seismic source is disclosed which is particularly useful for generating horizontally polarized shear waves in the earth for seismic surveying. It comprises an elongated, hollow, substantially...
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4706231 |
Reaction mass acceleration feedback device
An improvement for the drive control system of a vibratory sound source used in seismic exploration comprising apparatus for generating a feedback signal proportional to the instantaneous...
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4700804 |
Seismic energy source
A hydraulically controlled seismic energy source for impressing individual seismic energy pulses into the ground, wherein the hydraulic pressure forcing the ram downwardly is substantially reduced...
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4699240 |
Device for applying pulsed radial stresses to the wall of a well
A device for generating pulsed radial stresses to the wall of a well by application of pulses to anchorage shoes of a body lowered in the well, at the end of a cable provided with electric power...
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4691803 |
Projectile powered piston
A transportable seismic energy source having a baseplate for contacting the earth, an upper master cylinder affixed at its lower end to the base plate and extending uprightly from it, a receiving...
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4662473 |
Vibratory seismic source for generating combined compressional and shear waves
A vibratory seismic surface source includes a single vibrating mass, the energy of which is coupled with the earth through a ground contacting base plate. The vibrating mass is connected to the...
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4648478 |
Device for generating sound pulses inside a well, by percussion
A device for generating sound pulses in a well by a mobile mass striking against a target element integral with an elongate body anchored in a well by retractable shoes actuated by hydraulic...
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4641725 |
Wide dynamic range hydraulic vibrator
An apparatus for incremental cylinder length control in a hydraulic vibrator of the type having a reaction mass with a cylinder bore disposed therein, first and second end sleeves disposed in...
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4639905 |
Dual-mode vibrator
A dual mode vibrator assembly for selectively generating either pressure wave or shear wave signals in the earth has a single inertia mass with a plurality of vertically parallel offset cylinder...
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4632215 |
Dual-mode hydraulic vibrator
A dual-mode vibrator for alternately injecting P-waves and S-waves in the earth including a hydraulically driven shaker assembly, a ground-contacting base plate, and a jacking means for raising and...
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4630247 |
Vibrator thermal-stress differential compensator
An apparatus for preventing thermally-induced stress fatigue in a vibrator support housing consists of a stress compensator that absorbs thermal dimensional changes between major structural...
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4597464 |
Method and system for well velocity shooting and vertical seismic profiling
A method and system are provided for well velocity shooting and vertical seismic profiling utilizing mobile seismic land sources for transmitting powerful seismic energy impulses into the earth. A...
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4577723 |
Method for improving the efficiency of air guns
A quantity of a solution of a long-chain polymer is injected into the water around an air gun. The resulting dilute solution of the long-chain polymer tends to reduce turbulence surrounding the air...
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4519053 |
Force or pressure feedback control for seismic vibrators
A seismic vibrator source having an hydraulic vibrator coupled to vibrate a ground pad is provided with one or more force transducers such as, for example, load cells, strain gauges, or...
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4516230 |
Protective drive-level limiter for an electro-hydraulic vibrator
In accordance with an embodiment of this invention, voltages are received from the pilot valve torque motor, the main servo valve and the actuator indicating the value of the torque motor current,...
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