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| Number | Title | Issue Date |
| 8107316 | Controlled source imbalance apparatus, systems, and methods In some embodiments, an apparatus and a system, as well as a method and an article, may include exciting a plurality of signal source pairs having a substantially equal and non-zero acoustic signature amplitude difference in a frequency domain to provide acoustic si... | 01/31/2012 |
| 8107317 | Technique and system for performing a cross well survey A technique includes providing a source in a first well and a seismic receiver in a second well to detect a seismic event that is caused by the source. The technique includes referencing clocks in the source and receiver to a common reference time frame and determin... | 01/31/2012 |
| 8102732 | Anisotropy measurement while drilling Methods and apparatus facilitating measurement of anisotropy are disclosed. According to some aspects, anisotropy can be determined while drilling. Monopole/quadrupole interactions, as well as monitoring dipole excitations and other methods, may be used to find the ... | 01/24/2012 |
| 7933166 | Autonomous depth control for wellbore equipment A method for tracking a wellbore tool includes: obtaining a first image of the wellbore using an imager associated with the tool; obtaining a second image of the wellbore using the imager after a selected time period; matching the first image with the second image b... | 04/26/2011 |
| 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 receiving transducer wherein each element of the multi-element receiving trans... | 03/22/2011 |
| 7894297 | Methods and apparatus for borehole sensing including downhole tension sensing The present disclosure provides, among other things, apparatuses and methods for sensing subsurface data. One embodiment comprises borehole conveyance system tool, the borehole conveyance system tool comprising a conveyance, a sensor array disposed on the conveyance... | 02/22/2011 |
| 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 meeting physical restrictions of LWD and MWD logging systems. The transmit... | 01/04/2011 |
| 7768870 | Method for adjusting a seismic wave velocity model according to information recorded in wells The invention is a method for defining the development conditions of a hydrocarbon reservoir by updating a velocity model by means of log data. A first seismic depth image representative of the reservoir is established by using seismic data and a velocity model. A s... | 08/03/2010 |
| 7710822 | Vertical seismic profiling method utilizing seismic communication and synchronization A while-drilling Vertical Seismic Profiling (VSP) data acquisition system utilizing the same seismic shots for three purposes is disclosed. First, the seismic shots provide a means for synchronizing a downhole clock in the VSP receiver to a master clock at the surfa... | 05/04/2010 |
| 7688674 | Methods and apparatus for performing moving checkshots Methods and apparatus for creating a velocity profile of a formation surrounding a borehole by checkshot measurements while moving the tool along the borehole. A conveyance and a sensor section are configured to move the sensor section in the borehole. At least one ... | 03/30/2010 |
| 7679992 | Wettability from electro-kinetic and electro-osmosis measurements Methods and devices are provided for investigating an earth formation use electro-kinetics and/or electro-osmosis measurements. In one example, the method includes creating a pressure difference in the earth formation proximate to a wellbore; measuring a generated e... | 03/16/2010 |
| 7668042 | Method for obtaining a seismic wavelet using seismic data and well logs in a deviated well A method for obtaining a seismic wavelet using seismic data in a deviated well includes the steps of: (a) extracting seismic data along the well path; (b) calculating the well path in the time domain; (c) extracting a window of seismic data in the time domain along ... | 02/23/2010 |
| 7668041 | Apparatus and methods for acquiring seismic data while tripping A system for acquiring logging data comprises a controller for causing the generation of a signal in a formation surrounding a wellbore. The controller has a first clock for time-stamping a record of the generated signal. A receiver is deployed in the wellbore and i... | 02/23/2010 |
| 7660194 | Microseismic fracture mapping using seismic source timing measurements for velocity calibration A system and method for microseismic fracture mapping using seismic source timing measurements for velocity calibration is disclosed. The system may include a seismic source coupled to a wireline and a seismic source trigger, a sensor capable of detecting a first si... | 02/09/2010 |
| 7602668 | Downhole sensor networks using wireless communication Sensors located in the vicinity of a hydrocarbon-producing well receive power and communicate with one or more hubs located in the well or at the outer surface of a casing by means of elastodynamic waves. Each hub incorporates a plurality of transducers which permit... | 10/13/2009 |
| 7567485 | Method and apparatus for borehole sensing The present invention provides an apparatus and method for sensing subsurface data. One embodiment of the invention comprises a shuttle attached to a conveyance where the conveyance and shuttle are adapted to be spooled downhole into a borehole for sensing seismic d... | 07/28/2009 |
| 7554882 | Methods and systems for calibrating acoustic receivers A method for in-situ calibrating acoustic receivers while the tool is in an open or cased borehole or during a logging run in a borehole. The method and system facilitate calibrating the acoustic receivers while they are mounted to a downhole acoustic tool. Calibrat... | 06/30/2009 |
| 7551516 | Vertical seismic profiling method utilizing seismic communication and synchronization A while-drilling Vertical Seismic Profiling (VSP) data acquisition system utilizing the same seismic shots for three purposes is disclosed. First, the seismic shots provide a means for synchronizing a downhole clock in the VSP receiver to a master clock at the surfa... | 06/23/2009 |
| 7529150 | 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 system concurrently generates and senses monopole, dipole, quadrupole ... | 05/05/2009 |
| 7471591 | Method and apparatus for azimuthal logging of shear waves in boreholes using optionally rotatable transmitter and receiver assemblies An acoustic logging system with a borehole tool comprising a transmitter assembly and an axially spaced receiver assembly. The transmitter and receiver assemblies are optionally rotatable with respect to each other, depending upon the embodiment of the logging syste... | 12/30/2008 |
| 7463550 | Stoneley radial profiling of formation shear slowness Methods and apparatus facilitating radial profiling of shear slowness or shear modulus c66 in the cross-sectional plane of a borehole in an anisotropic formation with the vertical X3-axis are disclosed. According to some aspects of the inventio... | 12/09/2008 |
| 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 conductors to provide a voltage to the transducer elements. One embodime... | 12/02/2008 |
| 7457194 | Discriminating natural fracture- and stress-induced sonic anisotropy using a combination of image and sonic logs Fracture- and stress-induced sonic anisotropy is distinguished using a combination of image and sonic logs. Borehole image and sonic logs are acquired via known techniques. Analysis of sonic data from monopole P- and S-waves, monopole Stoneley and cross-dipole shear... | 11/25/2008 |
| 7433851 | System and method for inferring geological classes A system for inferring geological classes from oilfield well input data is described using a neural network for inferring class probabilities and class sequencing knowledge and optimising the class probabilities according to the sequencing knowledge. ... | 10/07/2008 |
| 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 |
| 7424367 | Method for predicting lithology and porosity from seismic reflection data Method for predicting lithology and porosity of subsurface rocks from seismic reflection data. The seismic data is inverted to yield elastic properties of the rocks such as the compressional and shear impedances. A rock physics model is built to relate porosity, the... | 09/09/2008 |
| 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 propagation in a drilling fluid in a downhole environment includes emit... | 09/02/2008 |
| 7414919 | Method for improving the seismic resolution A method for improving the seismic resolution in the field of petroleum exploration and development, using the steps of: (1) ensuring the depth and the velocity of the low-velocity layer and the high-velocity layer and the characteristic of the frequency spectrum of... | 08/19/2008 |
| 7414918 | Method for normalizing signals in a cement bond logging tool A longitudinally segmented acoustic transducer for a cement bond logging (CBL) tool having a plurality of adjoining PZT ring-like segments driven synchronously in parallel by one or more pulses and caused to vibrate in an anti-resonant mode, substantially below the ... | 08/19/2008 |
| 7414405 | Measurement tool for obtaining tool face on a rotating drill collar An apparatus for obtaining tool face angles on a rotating drill collar in substantially real time is disclosed. In one exemplary embodiment the apparatus includes a magnetoresistive magnetic field sensor deployed in a tool body. The apparatus further includes a prog... | 08/19/2008 |
| 7411864 | Method for processing signals in a cement bong logging tool A longitudinally segmented acoustic transducer for a cement bond logging (CBL) tool having a plurality of adjoining PZT ring-like segments driven synchronously in parallel by one or more pulses and caused to vibrate in an anti-resonant mode, substantially below the ... | 08/12/2008 |
| RE40321 | Remote reservoir resistivity mapping A method for surface estimation of reservoir properties, wherein location of and average earth resistivities above, below, and horizontally adjacent to the subsurface geologic formation are first determined using geological and geophysical data in the vicinity of th... | 05/20/2008 |
| 7372777 | Sonic instrumentation apparatus and method for cement bond logging A longitudinally segmented acoustic transducer for a cement bond logging (CBL) tool having a plurality of adjoining PZT ring-like segments driven synchronously in parallel by one or more pulses and caused to vibrate in an anti-resonant mode, substantially below the ... | 05/13/2008 |
| 7364007 | Integrated 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 |
| 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 |
| 7359800 | Determination of fracture orientation and length using multi-component and multi-array induction data Measurements made by multiarray and multicomponent induction resistivity measurements in a borehole are used for determining the orientation and length of fractures in an earth formation when the fractures have a fluid with a resistivity different from that of the e... | 04/15/2008 |
| 7359845 | Method and system for predictive stratigraphy images Methods and systems are provided for displaying and forecasting the lithology and wellbore conditions to be encountered while conducting drill string operations in a wellbore. A method and system is described for predicting and modeling lithology while operating a d... | 04/15/2008 |
| 7352651 | System and method for determining directional and non-directional fluid wave and current measurements A system for determining the directional properties of surface waves or internal waves of a fluid medium includes a sonar system having a plurality of transducers for generating respective, separate acoustic beams and receiving echoes from one or more range cells lo... | 04/01/2008 |
| 7348894 | Method 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 |
| 7348892 | Pipe mounted telemetry receiver Methods and apparatus for receiving a telemetry signal with a receiver that is moveably disposed within a drillstring. In certain embodiments, the system comprises a surface module coupled to the upper end of a drillstring, an upper module detachably connected to th... | 03/25/2008 |
