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9038765 Neutrally-buoyant borehole investigation tools and methods  
Neutrally-buoyant tools for seismic data collection are provided that may range from several hundred meters to several kilometers in length and have integrated sensors which move along with the...
8944183 Low frequency formation shear slowness from drilling noise derived quadrupole array data  
The present disclosure is related to apparatuses and methods measuring and processing a characteristic of subsurface earth formations penetrated by a borehole. More specifically this present...
8848485 Sonic/acoustic monitoring using optical distributed acoustic sensing  
Methods and apparatus for performing sonic well logging within a wellbore based on optical Distributed Acoustic Sensing (DAS) are provided. A sonic well logging system based on DAS may be capable...
8831886 System and method for reconstructing microseismic event statistics from detection limited data  
Embodiments of this invention relate to compositions and methods of processing a subterranean formation including collecting microseismic data from one wellbore, collecting amplitude ratio...
8773134 Logging tool sonde sleeve  
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...
8682587 Method and apparatus for determining the permeability of earth formations  
A method and apparatus for determining the fluid permeability of an earth formation is described. An instrument comprising an acoustic source and acoustic and electrokinetic sensors is located in...
8611183 Measuring standoff and borehole geometry  
Refracted ultrasonic waves are utilized to calculate tool standoff. An ultrasonic transmitter sends a wave toward (and into) the borehole wall at a critical incidence angle for refracted waves....
8526269 Methods and systems for deploying seismic devices  
Methods and systems for acoustically determining reservoir parameters of subterranean formations. A tool comprising at least one seismic source or seismic receiver mounted thereon; a conveyance...
8464790 Brine salinity from sound speed  
Temperature and pressure measurements that are made downhole are used to predict a compressional wave velocity for pure water under downhole conditions. The predicted velocity and a measured...
8408355 Enclosures for containing transducers and electronics on a downhole tool  
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...
8400872 Seismic source which incorporates earth coupling as part of the transmitter resonance  
An acoustic energy source for imparting acoustic energy into the Earth's subsurface includes an electrically driven transducer coupled to a source of swept frequency alternating current. A tunable...
8353339 Apparatus for the measuring of fluid levels and pumping of the same  
A device for employing sonic transmissions is utilized to determine fluid level in a well or a container. The device may be utilized while the well is operating. It is known that wells replenish...
8270251 Acoustic isolator  
An acoustic isolator for use with tubular assemblies such as drillpipe or production tubing comprising an acoustic wave transmitter, the acoustic isolator comprising, in series connection, an odd...
8261874 Attenuating out of band energy emitted from seismic sources  
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...
8258975 Communication system for communication with and remote activation of downhole tools and devices used in association with wells for production of hydrocarbons  
A system for communicating with downhole tools and devices is disclosed. The system includes multiple communication devices which, in combination, permit operators at the surface to operate...
8256565 Enclosures for containing transducers and electronics on a downhole tool  
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...
8220583 Acoustic isolator section  
An acoustic isolator section for an acoustic well logging tool, the isolator section comprising: an isolator comprising:(i) an isolator body;(ii) a mass;(iii) a resiliently deformable portion...
8136625 Attenuating out of band energy emitted from seismic sources  
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...
8125848 Acoustic logging-while-drilling tools having a hexapole source configuration and associated logging methods  
Multipole acoustic logging-while-drilling (LWD) tools and associated methods are disclosed herein. In some embodiments, the disclosed acoustic LWD tool comprises a transmitter array and at least...
8072840 Fracture clusters identification  
Method for identifying one or more fracture clusters in a formation surrounding a reservoir. In one implementation, the method may include generating a P to S image, comparing the P to S image to...
8061470 Method and apparatus for deploying a plurality of seismic devices into a borehole and method thereof  
Deploying systems and methods for deploying a plurality of seismic devices into a borehole comprising a cable including a plurality of inter-connected cable segments and ellipsoid seismic units...
8010291 Processing measurement data that involves computing a derivative of the measurement data that represents a subterranean structure  
To process measurement data representing a subterranean structure, a derivative of the measurement data collected by at least one survey receiver is computed, with respect to frequency. A response...
7997380 Low frequency acoustic attenuator  
An attenuation apparatus, system, and method are disclosed. The attenuator is attached to a pipe and includes a housing that includes an inner sleeve and an outer sleeve. The attenuator includes...
7970544 Method and apparatus for characterizing and estimating permeability using LWD Stoneley-wave data  
Stoneley-wave data acquired in the LWD environment are used to characterize/estimate formation permeability. Real-time Stoneley-wave time-delay/slowness and center-frequency/attenuation data are...
7913806 Enclosures for containing transducers and electronics on a downhole tool  
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...
7911876 Method for initializing receiver channels in a cement bond logging tool  
A method for initializing the input of each of m receiver channels of a receiving transducer in a well logging tool comprising the steps of selecting a logging tool having a multi-element...
7889596 Method and a system for determining the position of a drill bit  
A method and a system for determining the position of a drill bit are presented. The method comprises determining positions of seismic wave detectors, recording seismic waves generated at the...
7864629 Monopole acoustic transmitter comprising a plurality of piezoelectric discs  
A monopole acoustic transmitter with at least one disc assembly with a plurality of piezoelectric discs configured to optimized acoustic pressure output within a desired frequency range while...
7813220 Method and apparatus for long term seismic monitoring  
A method and apparatus for deploying seismic detectors and monitoring seismic activity associated with a production well from a down hole location within a well.
7764572 Methods and systems for acoustic waveform processing  
A technique for processing acoustic waveforms includes: (a) transforming at least a portion of the acoustic waveforms to produce frequency-domain signals; (b) obtaining a model dispersion curve...
7746725 Fracture clusters identification  
Method for identifying one or more fracture clusters in a formation surrounding a reservoir. In one implementation, the method may include generating a P to S image, comparing the P to S image to...
7721809 Wellbore instrument module having magnetic clamp for use in cased wellbores  
A magnetically clamped wellbore instrument module includes a substantially non-magnetic housing configured to traverse an interior of the wellbore. At least one electromagnet is disposed at a...
7694735 Sonde  
A sonde and an apparatus for the deployment thereof against a well casing is described, the sonde comprising a resilient C-shaped member and at least one sensor.
7688673 Connector nodes for interrogating optical fiber sensor arrays  
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,...
7681450 Casing resonant radial flexural modes in cement bond evaluation  
A method useful for evaluating the presence and/or the quality of the cement bond of a downhole tubular. The method involves measuring radial resonance modes of the tubular, and comparing those...
7660195 Attenuation mapping apparatus, systems, and methods  
In some embodiments, an apparatus and a system, as well as a method and an article, may include generating attenuation values associated with a set of multiple signals received by multiple...
7646674 Borehole apparatus and methods for simultaneous multimode excitation and reception to determine elastic wave velocities, elastic modulii, degree of anisotropy and elastic symmetry configurations  
An acoustic borehole logging system for generation and detection of multipole modes used to determine elastic properties of earth formations characterized as inhomogeneous anisotropic solids. The...
7637161 Substrate penetrating acoustic sensor  
An acoustic sensor configured to detect sound waves traveling through a substrate in which the acoustic sensor is embedded. The acoustic sensor includes a piezoelectric element and mass configured...
RE40944 Adjustable shear valve mud pulser and controls therefor  
A telemetry system involving a shear-type mud pulser valve as the preferred embodiment is described. The control system includes a motor driver for the mud pulser which, in essence, moves one...
7574303 Seismogram correction for absorption effects  
Correcting seismograms to compensate for absorption or dissipative effects that occur in the earth. In one implementation, a ratio of traveltime (t) to absorption parameter (Q) may be computed for...
7564741 Intelligent efficient servo-actuator for a downhole pulser  
An improved energy efficient intelligent pulser driver used for generating a mud pulse in a MWD (measurement while drilling) application. In the pulser driver, a direct current (DC) powered...
7500539 Method and apparatus of using crossed magnetic fields for measuring conductivity, permeability and porosity  
When a static magnetic field and a crossed oscillating field are applied, the deformation rate at a boundary between a fluid and a porous medium depends on the amplitudes of the applied magnetic...
7495995 Method and apparatus for investigating a borehole with a caliper  
Embodiments of the present invention relate to a caliper and method for mapping the dimensions and topography of a formation such as the sidewall of a borehole. Examples of formations in which...
7492664 Method for processing acoustic reflections in array data to image near-borehole geological structure  
A method and apparatus for enhancing the moveout between a direct wave and a reflected wave. The method involves transmitting imaging signals into a body to be imaged and receiving the resulting...
7463551 Method of generating directional low frequency acoustic signals and reflected signal detection enhancements for seismic while drilling applications  
The present invention provides a method and apparatus for using an acoustic logging tool conveyed in a borehole in an earth formation for determining a characteristic of the formation. The method...
7460435 Acoustic transducers for tubulars  
Acoustic transducers configured with transducer elements disposed on an arch or arcuate shaped member adapted to fit in juxtaposition around a tubular. The arcuate shaped member is adapted with...
7436185 Highly integrated logging tool  
An apparatus for logging a formation traversed by a borehole includes a plurality of logging tools adapted for conveyance inside the borehole. The plurality of logging tools includes a tool body,...
7418865 Method and apparatus for ultrasound velocity measurements in drilling fluids  
The disclosure relates to methods and apparatus for determining the velocity of an ultrasound pulse in drilling fluids in downhole environments. A method for determining a velocity of ultrasound...
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...
7356411 Method for acquiring and interpreting transient electromagnetic measurements  
A method for interpreting transient electromagnetic survey data includes measuring transient response of a medium over a plurality of switching events. The measured transient response to a first...
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