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| Number | Title | Issue Date |
| 7372776 | Modal acoustic array transduction apparatus A transduction apparatus, which employs an array of individual transducers that generates multiple acoustic radiation modes, is described. These modes are used together to yield directional steered beam patterns. In one embodiment separate transducers, clustered in ... | 05/13/2008 |
| 7209407 | Seismic 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... | 04/24/2007 |
| 6288975 | Acoustic sensing system for downhole seismic applications utilizing an array of fiber optic sensors A system for sensing subterranean acoustic waves emitted from an acoustic source includes a plurality of laser sources, a plurality of subterranean optical sensors, at least one optical detector, and electronics. The laser sources each emit light at a dif... | 09/11/2001 |
| 6179084 | Underground acoustic wave transmitter, receiver, transmitting/receiving method, and underground exploration using this On a source side, piezo-electric elements (34) are arranged such that vibration direction is perpendicular to a wall of a bore hole (12), and then an anvil (42) arranged on the piezo-electric elements in a bore hole wall side is pressure-contacted to the ... | 01/30/2001 |
| 5841734 | Rotating acoustic transducer head for cement bond evaluation tool An apparatus for logging a borehole comprises a non-rotating component and a rotating component that is flexibly attached to the non-rotating component and includes a logging head. The rotating component is centralized independently from the non-rotating ... | 11/24/1998 |
| 5640371 | Method and apparatus for beam steering and bessel shading of conformal array This invention describes a methodology to image features using an array of multiple piezo-electric elements which employs the selective use of mechanical and electronic beam focusing, electronic beam steering and amplitude shading to increase resolution a... | 06/17/1997 |
| 5635685 | Electroacoustic transducer with mechanical impedance transformer The transducer comprises for example a block (1) of sensitive elements such as piled piezoelectric disks held up by a stud bolt between two ferrules and a shell (8) all in one piece, that is arranged around the piling with a concave central part (8A) exte... | 06/03/1997 |
| 5615172 | Autonomous data transmission apparatus A autonomous borehole data transmission apparatus for transmitting measurement data from measuring instruments at the downhole end of a drill string by generating pressure pulses utilizing a transducer longitudinally responsive to magnetic field pulses ca... | 03/25/1997 |
| 5586084 | Mud operated pulser A poppet and orifice mud pulser assembly is disclosed for use in an MWD system. The mud pulser is capable of generating pressure pulses in the column of drilling mud of various amplitudes to increase the data rate of the mud pulse telemetry system. The mu... | 12/17/1996 |
| 5586083 | Turbo siren signal generator for measurement while drilling systems A self-propelled turbo siren modulator assembly is disclosed for use in an MWD system. The turbo siren includes a fixed turbine deflector located upstream from a rotor, which in turn is located upstream from a fixed stator. Drilling mud flowing through th... | 12/17/1996 |
| 5553034 | Differential pressure fluid density instrument The present invention is a differential pressure fluid density production logging tool. The tool comprises an elongated housing adapted to traverse a wellbore. The housing has ports in hydraulic communication with the wellbore at spaced apart locations. T... | 09/03/1996 |
| 5387767 | Transmitter for sonic logging-while-drilling A sonic transmitter assembly for use in logging-while-drilling includes stacks of piezoelectric crystals that extend outwardly from a nodal plate member, and a generally tubular assembly that contains such stacks and has end portions that are sealingly mo... | 02/07/1995 |
| 5357481 | Borehole logging tool A logging-tool assembly for generating both flexural wavefields and compressional wavefields in the sidewall formations encountered by a borehole. The assembly consists of a sonde constructed of a plurality of segments that are axially rotatable with resp... | 10/18/1994 |
| 5319610 | Hydraulic acoustic wave generator system for drillstrings An acoustic wave generator for telemetering signals through a drillstem comprises a sub interposed in the drillstem with a central mandrel and a piston mass disposed in sleeved relationship around the mandrel and reciprocable by hydraulic pressure fluid t... | 06/07/1994 |
| 5313025 | Displacement amplified acoustic transmitter This disclosure is directed to a displacement amplifier for forming acoustic pulses and more particularly to one which incorporates a flexible movable lightweight diaphragm of rectangular configuration. It has upper and lower ends which are connected to o... | 05/17/1994 |
| 5289433 | Acoustic multi-mode wide-band logging device A multi-mode receiver sonde having individual receiver stations. The receiver stations have transducers which have a flat frequency response over a selected bandwidth so that there is an approximately constant ratio in amplitude and substantially little p... | 02/22/1994 |
| 5285023 | Downhole hydraulic rotary seismic source The present invention relates to an improved downhole seismic source for the simultaneous generation of elliptically polarized shear wave seismic energy and compression wave seismic energy coupled into a borehole. The source of the present invention is ca... | 02/08/1994 |
| 5283768 | Borehole liquid acoustic wave transducer A transducer is described especially designed for use in providing acoustic transmission in a borehole. The transducer includes a multiple number of magnetic circuit gaps and electrical windings that have been found to provide the power necessary for acou... | 02/01/1994 |
| 5268537 | Broadband resonant wave downhole seismic source Method and apparatus for generating resonant broad band pressure waves in a fluid-filled wellbore for seismic exploration. In the preferred embodiment, a device is provided in a borehole; the device comprises a cylindrical choke body and a means at each e... | 12/07/1993 |
| 5248857 | Apparatus for the acquisition of a seismic signal transmitted by a rotating drill bit The invention concerns an apparatus for the acquisition of a seismic signal transmitted by a drill bit, placed at the end of a drill pipe rotating about an axis of rotation. According to the invention, the acquisition apparatus consists of a coupling conn... | 09/28/1993 |
| 5214252 | Logging method and device in well bores utilizing directional emission and/or reception means A method of use of a logging tool (1) including a directional emission device (4) and/or reception device (R1, R2) and the achieving of several series of loggings while modifying between each series the orientation of the directivity diagrams. At least on... | 05/25/1993 |
| 5212353 | Transducer system for use with borehole televiewer logging tool A focused acoustic transducer for use with a borehole televiewer wherein the transducer is provided with a concaved surface designed to focus the acoustic energy and reduce the energy present in the side lobes of the near field.... | 05/18/1993 |
| 5192948 | Geophone borehole cable A borehole cable includes a plurality of geophone-containing modules spaced apart along the cable by a plurality of conduit sections and designed for acoustic, thermal and pressure imaging of the subsurface. Each cable conduit section comprises an inner c... | 03/09/1993 |
| 5157392 | Telemetry network for downhole multistation seismic recording tools A seismic logging system for VSP or cross well data capture set forth. It is comprised of M duplicate recording stations connected serially below a main structure suspended on a logging cable. Each of the recording stations preferably includes orthogonall... | 10/20/1992 |
| 5142500 | Non-destructive method of measuring physical characteristics of sediments A non-destructive method of measuring physical characteristics of sediments to obtain a cross-sectional distribution of porosity and permeability values and variations, and of shear modulus and shear strength. A pair of boreholes have borehole entries spa... | 08/25/1992 |
| 5119343 | Transducers for acoustic logging tool A transducer for an acoustic logging tool includes a liquid-filled cavity formed by a substantially rigid housing portion of the tool and having a resilient barrier member disposed between liquid in the wellbore and the liquid in the cavity. A magnetic fi... | 06/02/1992 |
| 5115880 | Piezoelectric seismic vibrator with hydraulic amplifier A piezoelectric seismic vibrator is disclosed which utilizes a hydraulic system to amplify the longitudinal displacement which results from the application of a voltage to a stack of piezoelectric elements. In each disclosed embodiment of the present inve... | 05/26/1992 |
| 5113966 | Downhole hydraulic seismic generator A downhole hydraulic seismic generator system for transmitting energy wave vibrations into earth strata surrounding a borehole. The system contains an elongated, unitary housing operably connected to a well head aboveground by support and electrical cabli... | 05/19/1992 |
| 5105390 | Acoustic measuring device A sonde is secured to the end of an electrical cable and is inserted is a bore hole by means of the electrical cable. The sonde has a transmitter and receiver. The other end of the cable is secured to apparatus on the surface, and the apparatus includes m... | 04/14/1992 |
| 5081391 | Piezoelectric cylindrical transducer for producing or detecting asymmetrical vibrations A transducer is constructed of a cylindrical shell and at least one pair of piezoelectric sections. Each member of the pair of piezoelectric sections is rigidly bonded to the wall of the cylinder, in a position diametrically opposed from the other member ... | 01/14/1992 |
| 5069307 | Acoustic signal transmitter for logging tools An acoustic signal transmitter for well logging tools and the like comprising a housing having a generally rectangular opening formed therein and defining a fluid filled cavity in which a compliant sheet transmitter member is disposed and is provided in a... | 12/03/1991 |
| 5060751 | Pneumatic wall-locking geophone system A seismic signal receiving system is provided for use in boreholes to receive seismic waves in carrying out geophysical investigations. The system includes three pairs of opposed plates, each of the pairs of plates including oppositely facing outer surfac... | 10/29/1991 |
| 5047992 | Electromagnetically induced acoustic well logging An electromagnetic source or sources in a sonde in a well bore is caused to emit electromagnetic forces into the well casing. The electromagnetic forces cause displacement of the casing, inducing acoustic waves. The acoustic waves may be either P-waves or... | 09/10/1991 |
| 5044462 | Focused planar transducer An acoustin transducer system for a borehole televiewing apparatus is set forth. In the preferred embodiment, a ceramic circular disc is used and is divided by grooves selected thereon into a set of N concentric rings where N is a whole number integer. Ea... | 09/03/1991 |
| 5035297 | Anti-bounce device for a mass striking a target element An anti-bounce device for a mass striking a target element, with the device including a counter mass and a linking arrangement for holding the counter mass spaced from the mass and a braking arrangement for delaying the counter mass so as to put the count... | 07/30/1991 |
| 5031719 | Seismic sonde An instrument for sensing seismic waves and determining their direction of propagation is operable at considerable depth in a borehole. It comprises a short, stubby sensor module with means to clamp it to the borehole wall and including three acceleromete... | 07/16/1991 |
| 5005665 | Piezoelectric seismic vibration device and method A vibrator and method for transmitting seismic signals into the earth to obtain data on various subsurface characteristics. The vibrator is driven with piezoelectric transducers, and can produce better signal resolution at higher frequencies than is possi... | 04/09/1991 |
| 4960181 | Method and device for improving the coefficient of transmission to geological formations of energy created by a well seismic source A method is provided for improving the coefficient of transmission to geological formations of the energy generated by the firing of a seismic source lowered inside a well or borehole and a device for implementing same. A zone of the wall containing the s... | 10/02/1990 |
| 4953136 | Downhole seismic exploration device and apparatus A downhole seismic exploration device comprises a seismic detector such as a geophone and a magnetic clamp, supported by Q-rings in an open cradle carrier which can be secured to a cable linking several such devices into an array. The array is lowered int... | 08/28/1990 |
| 4949316 | Acoustic logging tool transducers Electrical signal-receiving transducers for logging tools include a silicon plate having piezoresistors formed thereon and response to deflection caused by pressure waves acting on said plate to generate an electrical signal through a bridge circuit inclu... | 08/14/1990 |
