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| Number | Title | Issue Date |
| 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 one or more images from a borehole, and identifying one or more fractu... | 12/06/2011 |
| 8009509 | Automated mud slowness estimation An integrated framework is described for automating some or all of mud slowness estimation for both fast and slow formations. An estimation of fluid slowness based on monopole radial profiling is calculated if conditions permit. Alternatively, an estimation of fluid... | 08/30/2011 |
| 7830744 | Method for determining reservoir permeability form borehole Stoneley-wave attenuation using Biot's poroelastic theory Method for determining reservoir permeability from Stoneley wave attenuation extracted from conventional sonic logs by inversion of the full Biot wave equations for a porous medium. Frequency-dependent Stoneley-wave attenuation is extracted by analyzing array sonic ... | 11/09/2010 |
| 7830745 | Identifying the -factor using microseismic event generated -coda waves A method and system model of the formation and rock matrices in a well site. A microseismic event from a hydraulic fracture in a well bore is recorded at a monitoring well site. The S-coda wave window of the microseismic event is identified. Q-factors for a set of f... | 11/09/2010 |
| 7813219 | Electro-magnetic acoustic measurements combined with acoustic wave analysis A method and apparatus for assessing the permeability of a subterranean formation and the hydrocarbon and/or water content of the formation. The method includes emitting an acoustic signal, such as a Stoneley wave into the formation and sending an electro-magnetic p... | 10/12/2010 |
| 7796468 | Prediction of shallow drilling hazards using seismic refraction data Shallow drilling hazards (44), such as karsts, caves, voids and unconsolidated discontinuities, that can pose significant risks to exploration and development well drilling operations are detected employing seismic refraction data on which a series of attribu... | 09/14/2010 |
| 7782709 | Multi-physics inversion processing to predict pore pressure ahead of the drill bit Methods are disclosed to predict pore pressure ahead of the drill bit while drilling a borehole through subsurface regions. ... | 08/24/2010 |
| 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 based on a borehole-formation model having a set of borehole-formation p... | 07/27/2010 |
| 7755972 | 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 ... | 07/13/2010 |
| 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 one or more images from a borehole, and identifying one or more fractu... | 06/29/2010 |
| 7672193 | Methods and systems for processing acoustic waveform data Methods and systems for taking acoustic measurements related to subterranean formations. The methods and systems provide extracting a portion of the acoustic measurements based on predetermined parameters for selecting reflected arrival waves in the acoustic measure... | 03/02/2010 |
| 7668043 | Methods and systems for sonic log processing Techniques for processing sonic waveform data include processing the data based on an initial set of formation-borehole parameters, to produce initial coherence peak attributes, wherein the processing is performed in a borehole; sending the initial coherence peak at... | 02/23/2010 |
| 7660196 | Methods for processing dispersive acoustic waveforms A method for processing acoustic data comprising applying a dynamic filter band. The method and apparatus may be particularly adapted to processing sonic data to measure formation slowness in a borehole. ... | 02/09/2010 |
| 7652950 | Radial profiling of formation mobility using horizontal and vertical shear slowness profiles Methods and apparatus facilitating radial profiling of formation mobility are disclosed. Radial profiling of formation mobility aids in an optimal completion of a well for enhanced production. Some aspects of the present invention provide a technique for radial prof... | 01/26/2010 |
| 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 system concurrently generates and senses monopole, dipole, quadrupole ... | 01/12/2010 |
| 7602669 | Tube-wave seismic imaging The detailed analysis of cross well seismic data for a gas reservoir in Texas revealed two newly detected seismic wave effects, recorded approximately 2000 feet above the reservoir. A tube-wave (150) is initiated in a source well (110) by a source (... | 10/13/2009 |
| 7529151 | Tube-wave seismic imaging The detailed analysis of cross well seismic data for a gas reservoir in Texas revealed two newly detected seismic wave effects, recorded approximately 2000 feet above the reservoir. A tube-wave (150) is initiated in a source well (110) by a source (... | 05/05/2009 |
| 7529152 | Use of an effective tool model in sonic logging data processing Methods and apparatus facilitating radial profiling of shear slowness are disclosed. According to some aspects of the invention, acoustic tool bias is accounted for in the calculation of radial profiles. According so some aspects, acoustic tool bias is accounted for... | 05/05/2009 |
| 7518949 | Shear wave velocity determination using evanescent shear wave arrivals A method for determining a shear wave velocity of a subterranean formation from a leaky shear wave arrival is disclosed. Standoff measurements are utilized to indicate the presence of leaky shear wave arrivals in the received waveforms. In one exemplary embodiment, ... | 04/14/2009 |
| 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 signals propagated from the signal source. The step of receiving the pr... | 02/17/2009 |
| 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 |
| 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 |
| 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 |
| 7334661 | Acoustic logging tool sleeve An acoustic logging tool sleeve with a preferably discontinuous, alternating structure that is acoustically opaque in some zones, and acoustically transparent in others. The sleeve may be modular, with several stages connected together. The multiple stages provide a... | 02/26/2008 |
| 7311143 | Method and apparatus for generation of acoustic shear waves through casing using physical coupling of vibrating magnets The method and apparatus of the present invention provides for inducing and measuring shear waves within a wellbore casing to facilitate analysis of wellbore casing, cement and formation bonding. An acoustic transducer is provided that is magnetically coupled to the... | 12/25/2007 |
| 7310285 | Method for characterizing shear wave formation anisotropy A method of characterizing shear wave anisotropy in a formation includes obtaining crossed-dipole waveforms from a borehole penetrating the formation over a range of depths and frequencies, determining far-field slowness in a fast-shear and slow-shear direction usin... | 12/18/2007 |
| 7301852 | Methods 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 comprises using a first acoustic source for generating an acoustic sig... | 11/27/2007 |
| 7301345 | While-drilling methodology for estimating formation pressure based upon streaming potential measurements Logging-while-drilling apparatus and methodologies for measuring streaming potential in an earth formation are provided. The apparatus and methodologies can be utilized to find information relevant to the drilling operations. In particular, since the streaming poten... | 11/27/2007 |
| 7260477 | Estimation of borehole geometry parameters and lateral tool displacements A method for determining a borehole geometry parameter vector and/or lateral tool displacement vectors in a borehole is provided. The method includes acquiring at least one set of standoff measurements at a corresponding time. The method also includes processing a s... | 08/21/2007 |
| 7257489 | Quadrupole acoustic shear wave logging while drilling A tool generates signals indicative a shear wave slowness of the formation surrounding a borehole. The tool comprises a collar portion adapted for mounting in a drill string, a quadrupole sonic transmitter mounted to the collar portion, and a quadrupole sonic receiv... | 08/14/2007 |
| 7243718 | Methods for locating formation fractures and monitoring well completion using streaming potential transients information Earth formations are characterized by using an array of electrodes which can measure streaming potentials in the formation, and by interpreting the data obtained by the electrodes. The electrodes are placed on a wireline tool, a LWD tool, or in a fixed manner about ... | 07/17/2007 |
| 7243029 | Systems and methods of hydrocarbon detection using wavelet energy absorption analysis Disclosed herein are systems and methods of hydrocarbon detection based on wavelet energy absorption analysis. One disclosed hydrocarbon detection method embodiment includes: a) obtaining seismic trace data for a region of interest; and b) processing the seismic tra... | 07/10/2007 |
| 7207397 | Multi-pole transmitter source Methods and apparatus facilitating logging-while-drilling (LWD) using a multi-pole acoustic transmitter source. The multi-pole transmitter source enables measurement of formation velocities, including shear wave velocities through formations that are slower than vel... | 04/24/2007 |
| 7206782 | Method for deriving a GrAZ seismic attribute file The method for deriving a GrAZ seismic attribute file entails inputting a horizon file and an attribute file, obtaining the gradient of the horizon file thereby producing a horizon vector file, indexing from the attribute file data at corresponding geographic locati... | 04/17/2007 |
| 7205762 | Downhole high resolution NMR spectroscopy with polarization enhancement An apparatus and method is discussed for characterizing a fluid sample downhole of aliphatic hydrocarbon compounds, aromatic hydrocarbon compound, or connate mud filtrates containing carbon-13 isotopes using an enhanced nuclear magnetic resonance (NMR) signal on a m... | 04/17/2007 |
| 7187620 | 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... | 03/06/2007 |
| 7177765 | Method of general elastic inversion by combination of calculated pseudo-shear and measured compressional seismic amplitude information A method designed to combine both pseudo compressional interval velocity and pseudo shear interval velocity from seismic data for predicting fluid type and porosity in oil and gas exploration. The first step is the generation of ψS, pseudo shear reflectivity data, ... | 02/13/2007 |
| 7173542 | Data relay for casing mounted sensors, actuators and generators A casing sensor and methods for sensing using a casing sensor are disclosed. The casing sensor includes a casing shoe and a sensor coupled to the casing shoe. A casing data relay includes a downhole receiver coupled to a well casing and a transmitter coupled to the ... | 02/06/2007 |
| 7126332 | Downhole high resolution NMR spectroscopy with polarization enhancement An apparatus and method is discussed for characterizing a fluid sample downhole of aliphatic hydrocarbon compounds, aromatic hydrocarbon compound, or connate mud filtrates containing carbon-13 isotopes using an enhanced nuclear magnetic resonance (NMR) signal on a m... | 10/24/2006 |
