Quotables
"It is my heart-warmed and world-embracing Christmas hope and aspiration that all of us, the high, the low, the rich, the poor, the admired, the despised, the loved, the hated, the civilized, the savage (every man and brother of us all throughout the whole earth), may eventually be gathered together in a heaven of everlasting rest and peace and bliss, except the inventor of the telephone. "
Mark Twain ; Christmas greetings, 1890
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| Number | Title | Issue Date |
| 7423930 | Methods and systems for detecting arrivals of interest Methods and systems for taking measurements related to subterranean formations. The methods and systems provide robust, reliable first arrival data for component signals of interest, which may be used to estimate formation slowness, characterize formation slowness z... | 09/09/2008 |
| 7340384 | Process for determining the variation in the relative permeability of at least one fluid in a reservoir A method for determining for a reservoir (1) containing fluids (W, O), the variation in the relative permeability (krO, krW) of at least one of the fluids, as a function of the saturation of at least one of the fluids (W, O),) is provided. According to this m... | 03/04/2008 |
| 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 |
| 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 |
| 7035165 | Imaging near-borehole structure using directional acoustic-wave measurement Directional acoustic measurements made in the borehole are used for imaging a near-borehole geological formation structure and determination of its orientation. Four-component cross-dipole data set measured in a deviated borehole in combination with the directionali... | 04/25/2006 |
| 7032707 | Acoustic isolator downhole applications A plurality of heavy mass irregularities attached to an inner wall of the drill collar attenuate waves traveling through the collar. The plurality of heavy mass irregularities are spaced and sized for the maximum attenuation of acoustic pulses in a predetermined fre... | 04/25/2006 |
| 7028806 | Acoustic isolator for downhole applications An apparatus for performing acoustic investigations while drilling a borehole in a subsurface geological formation comprises a longitudinally extending assembly conveyed in the borehole on a drilling tubular. The assembly and the drilling tubular have a drilling flu... | 04/18/2006 |
| 6907348 | Synthetic acoustic array acquisition and processing The present invention provides a method of determining a property of an earth formation using an acoustic logging tool on a bottomhole assembly (BHA) in a borehole in the earth formation. At least one transmitter is used in the acoustic logging tool for generating a... | 06/14/2005 |
| 6868038 | Seismic method of performing the time picking step The present invention provides a method of performing the time picking step in a VSP (vertical seismic profile) survey. In a preferred embodiment of the invention the time picking step is carried out on a combined three-component amplitude of the received seismic en... | 03/15/2005 |
| 6801473 | Method for estimating and removing artifact noise from seismic data A seismic signal is represented as a combination of a geologic signal and a noise signal. The representation of the seismic signal is decomposed into a linear combination of orthonormal components. One or more components are identified in which the geologic signal a... | 10/05/2004 |
| 6151275 | Method of dual wavefield reinforcement A method and system of dual wavefield reinforcement or increasing the contributions to each image point in the seismic image can be accomplished by aligning the upward traveling energy, U, and the downward traveling energy, D, and then summing U and D in ... | 11/21/2000 |
| 6125079 | System and method for providing dual distance transducers to image behind an acoustically reflective layer A transducer configuration for use in acoustically imaging a target region behind an acoustically reflective layer includes a sonde having a geometrical center and constructed and arranged to support a plurality of transducers. The system includes a first... | 09/26/2000 |
| 5995447 | System and method for processing acoustic signals to image behind reflective layers A system for acoustically imaging a target region behind an acoustically reflective layer includes a transducer configuration for acquiring acoustic image data from the reflective layer and target region, wherein the reflective layer and target region are... | 11/30/1999 |
| 5798982 | Method for inverting reflection trace data from 3-D and 4-D seismic surveys and identifying subsurface fluid and pathways in and among hydrocarbon reservoirs based on impedance models A method is disclosed for inverting 3-D seismic reflection data obtained from seismic surveys to derive impedance models for a subsurface region, and for inversion of multiple 3-D seismic surveys (i.e., 4-D seismic surveys) of the same subsurface volume, ... | 08/25/1998 |
| 5753812 | Transducer for sonic logging-while-drilling An acoustic wave transducer useful in sonic logging while drilling a borehole through an adjacent earth formation includes an array of transducer elements mounted circumferentially around a drill collar. The elements are bonded in an elastomer ring that i... | 05/19/1998 |
| 5654938 | Method for identifying alteration of earth formations using dipole acoustic logging A method for detecting alteration of earth formations penetrated by a wellbore. The method includes determining a first arrival velocity of dipole acoustic energy propagated through the earth formations. A first frequency dependent velocity of the dipole ... | 08/05/1997 |
| 5638337 | Method for computing borehole geometry from ultrasonic pulse echo data A method for using geometrical data to determine characteristics of a wellbore penetrating a subterranean formation is disclosed. The method involves converting data obtained form acoustic well logging into cartesian coordinates and solving a general quad... | 06/10/1997 |
| 5587966 | Sonic well logging methods and apparatus for processing flexural wave in optimal frequency band Methods for determining an optimal frequency band for processing of flexural waves according to bias-corrected STC or QSTC are disclosed. A preliminary estimate of the formation shear slowness S and a determination of the borehole diameter D are first obt... | 12/24/1996 |
| 5491668 | Method for determining the thickness of a casing in a wellbore by signal processing pulse-echo data from an acoustic pulse-echo imaging tool The invention is a method of determining the thickness of a casing in a wellbore penetrating an earth formation using group delay determined casing resonance extracted from processed reflection signals from an acoustic pulse-echo imaging tool. A first Fou... | 02/13/1996 |
| 5197038 | Method and sonic tool apparatus for investigating properties of earth formations transversed by a borehole Methods are provided which utilize a sonic tool for quantitatively determining parameters of a velocity profile of an altered zone in a rock formation traversed by a borehole. Synthetic amplitude information for the formation is generated by a computer mo... | 03/23/1993 |
| 4962489 | Acoustic borehole logging An acoustic borehole logging system employs an acoustic tranmitter excited by a sweep frequency tone burst to produce an acoustic output having a free-field frequency spectrum of at least one resonant frequency of vibration. A closely-spaced acoustic rece... | 10/09/1990 |
| 4855965 | Time ramped gain for borehole televiewer Amplifier gain is time ramped to increase amplification of the signal with increasing mud transit time and attenuation. Amplitude, ramp slope, and ramp onset time are independently controllable from the surface.... | 08/08/1989 |
| 4829486 | Transmitting multiple borehole parameters in sonic logging In an acoustic logging system for providing information regarding selected parameters of the wall of a borehole in the earth, and of the rock formation which is adjacent the borehole, in which a single transmit/receive transducer system (T/RTS) mounted on... | 05/09/1989 |
| 4817059 | Borehole logging methods for detection and imaging of formation structural features Waveform data obtained in a borehole by a tool having a sonic source and an array of sonic detectors is analyzed to obtain an image of formation features within several tens of feet of the borehole, such as fractures, bed boundaries and other boreholes. A... | 03/28/1989 |
| 4809236 | Method and apparatus for determining the magnitude of components of measurements made from inside a borehole Techniques are described whereby measurements derived from acoustic investigations made from inside a borehole penetraing an earth formation are factorized into components with high depth resolution. In one embodiment travel times of an acoustic wave such... | 02/28/1989 |
| 4805156 | System for acoustically determining the quality of the cement bond in a cased borehole The present invention is directed to an apparatus and method for obtaining azimuthally dependent measurements for evaluating the casing cement bond quality and, more particularly, for detecting and specifically locating channels or fissures between the ca... | 02/14/1989 |
| 4791618 | Well logging method and system for detecting structural and stratigraphic geological make-up of subsurface formations Disclosed are a well logging process and a well logging system using dipmeter and other logs to find subsurface faults and unconformities and automatically produce therefrom, and with user interaction, a subsurface map of the structural and depositional e... | 12/13/1988 |
| 4736348 | Method and apparatus for logging the characteristics of materials forming the walls of a borehole A borehole televiewer logging tool employs a transducer assembly having a transmitter of acoustic energy pulses and a receiver of acoustic energy pulses representing reflections of the transmitted acoustic energy pulses from the walls of a borehole traver... | 04/05/1988 |
| 4698793 | Methods for processing sonic data A method of sonic logging in which there is established at a depth of interest in a borehole a set of peak matrices comprised of peak vectors representative of a plurality of different characteristics of sonic signals traversing an earth formation. A set ... | 10/06/1987 |
| 4698791 | Acoustic well logging method for improved amplitude data acquisition An acoustic well logging method employing a tool having at least two acoustic transmitters and at least two acoustic receivers. In a preferred embodiment, one receiver is positioned midway between the two transmitters, and the other receiver is spaced fro... | 10/06/1987 |
| 4672588 | Method for displaying acoustic well logging data by producing travel time stacks A method for producing a display of acoustic signals received during full waveform acoustic well logging. In a preferred embodiment, the signals received at the individual receiver (or receivers) of the logging tool are stacked along lines of constant aco... | 06/09/1987 |
| 4641724 | Fracture detection using circumferential offset acoustic paths In the apparatus and method of the invention, acoustic energy is propagated in two slightly differing, or offset, circumferential paths in such a way as to interact with the formation under investigation. The propagating energy is detected and the resulti... | 02/10/1987 |
| 4551823 | Method and apparatus for acoustic cement bond logging A logging instrument is caused to traverse a cased earth borehole periodically emitting and receiving acoustic energies, such instrument generating an electrical signal containing one or more electrical alternations representative of the received acoustic... | 11/05/1985 |
| 4524433 | High speed sonic logging using multiple transducers In an acoustic logging system for providing information regarding selected parameters of the wall of a borehole in the earth, and of the rock formation which is adjacent the borehole, in which a single transmit/receive transducer system (T/RTS) mounted on... | 06/18/1985 |
| 4495606 | Method and apparatus for combined cement bond and acoustic well logging Method and apparatus are provided for measuring acoustic signals having amplitudes of widely varying magnitude during one traversal of the borehole corresponding to indications of cement bonding along a casing as well as acoustic travel time through an in... | 01/22/1985 |
| 4449208 | Lithologic studies utilizing acoustic wave attenuation A method for determining the lithology of subterranean structures based on attenuation of wave energy is disclosed which features a wave model based on a two-way solution to the wave equation rather than one-way solutions previously proposed. Rather than ... | 05/15/1984 |
| 4419748 | Continuous wave sonic logging Apparatus and method for sonic borehole logging using a continuous wave transmitted signal. The transmitted signal is received at a plurality of points distributed along the borehole axis and sampled synchronously with the transmitted signal. The resultin... | 12/06/1983 |
| 4414651 | Integrated well logging system and method An improved well logging technique is provided for more accurately deriving measurements of sub-surface earth formations, for processing and recording such measurements to record them in reproducible form, and to more informatively display such measuremen... | 11/08/1983 |
| 4349896 | Digital acoustic logging method and apparatus A well-logging method and apparatus in which a fast real time portion of a logging signal is sequentially sampled at discrete times. These sampled segments are stored and then are clocked out of storage over an expanded time period. The rms amplitude port... | 09/14/1982 |
| 4346460 | Method and apparatus for deriving compensated measurements in a borehole A technique for producing measurements of physical characteristics of subsurface media near a borehole penetrating the earth is disclosed that uses multiple transducers positioned along a borehole tool. A number of transducers of a first type, such as tra... | 08/24/1982 |
