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7558153 |
Radial profiling of slowness: methods and apparatus for near-wellbore alteration estimation
Methods and apparatus facilitating radial profiling of acoustic slowness of a formation traversed by a borehole are disclosed. According to some aspects of the invention, a radial slowness profile...
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7542373 |
Vector 3-component 3-dimensional kirchhoff prestack migration
An apparatus and a method for migration of three components, 3-Dimensions seismic (3-C, 3-D) data acquired by down-hole receivers and surface seismic sources. This method utilizes full 3 components...
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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 (...
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7523002 |
Method and system for cause-effect time lapse analysis
A method of evaluating changes for a wellbore interval involves acquiring a first log data from a logging sensor during a first pass over the wellbore interval, acquiring a second log data from the...
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7450469 |
Water velocity corrections
Various technologies for a method for processing seismic data. In one implementation, the method includes cross-correlating seismic traces having midpoint locations, offsets and azimuths within a...
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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...
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7405997 |
Method of accounting for wavelet stretch in seismic data
A computer-implemented method of accounting for angle-dependent wavelet stretch in seismic data based on a novel relationship between wavelet stretch and the cosine of a reflection angle of an...
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7317989 |
Method and apparatus for chemometric estimations of fluid density, viscosity, dielectric constant, and resistivity from mechanical resonator data
The present invention provides a chemometric equation to estimate fluid density, viscosity, dielectric constant and resistivity for a formation fluid sample downhole. The chemometric estimates can...
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7196634 |
Systems for predicting earthquakes and methods of employing such systems
A method of predicting earthquakes includes the step of positioning a first transducer array adjacent to a seismically active region and below the water table, i.e., within the zone of saturation....
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6920082 |
Method and apparatus for determining earth formation shear-wave transverse isotropy from borehole stoneley-wave measurements
The present invention is a method of determining formation horizontal shear wave velocity, formation transverse isotropy and an effective logging tool modulus. The method comprises determining an...
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6891777 |
Subsurface borehole evaluation and downhole tool position determination methods
Methods for processing ultrasonic signal data to evaluate subsurface properties and tool orientation. Acoustic signals are transmitted into a plurality of azimuthal borehole positions. Formation...
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6816435 |
Method for estimating the position of a drill
The present invention relates to a method for estimating the position and trajectory of a drill during drilling of boreholes in rock. The method comprising the steps of determining the starting...
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6788619 |
Concentrating seismic energy in a selected target point in an underground formation
Providing a set of seismic sources in a focusing array to enable concentrating seismic energy in a selected target point (k) in an underground formation, by performing a standard seismic survey of...
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6747915 |
Seismic imaging a subsurface formation
A method of seismic imaging a subsurface formation using an array of seismic sources and an array of seismic receivers located subsurface, wherein there is a complex transmission medium between the...
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6618322 |
Method and apparatus for measuring acoustic mud velocity and acoustic caliper
A method and apparatus for determining acoustic mud velocity and bore hole caliper in a downhole environment. A highly accurate acoustic signal is adjusted for mud velocity as continuously...
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6510389 |
Acoustic detection of stress-induced mechanical damage in a borehole wall
A method provides for locating and measuring mechanical damage in rock surrounding a borehole by detecting one or both of reductions in ultrasonic compressional wave velocity in the rock as a...
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6366531 |
Method and apparatus for acoustic logging
The invention is a method and apparatus for acoustic logging including one or more acoustic transmitters and one or more acoustic receivers. One or more of the elements of a set made up of the...
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6351991 |
Determining stress parameters of formations from multi-mode velocity data
A method for determining unknown stress parameters in earth formation measures velocities in four sonic transmissions modes (compression, fast shear, slow shear and Stoneley) at a series of depths....
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6002339 |
Seismic synchronization system
A system for synchronizing a seismic system having multiple subsystems. A control system transmits a message to selected subsystems and an internal subsystem counter is zeroed to a selected epoch....
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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...
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5886255 |
Method and apparatus for monitoring mineral production
Long-term changes in the distribution of a mineral in a subsurface deposit, due to commercial production of the mineral, are monitored by suitable instrumentation. The monitoring instrumentation is...
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5737277 |
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 from acoustic well...
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5691475 |
Method for measuring the propagation velocity of ultrasonic acoustic waves through rock fragments
Method for measuring the propagation velocities of ultrasonic acoustic waves through rock fragments which includes the steps of (a) introducing the fragment in a coupling fluid between a pair of...
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5648937 |
Method and apparatus for correlating geological structure horizons from velocity data to well observations
A method and apparatus for adjusting the results of a seismic survey according to well log data obtained from wells within the survey region is disclosed. The disclosed method operates on one...
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5644550 |
Method for logging behind casing
A method for logging a subterranean formation from within a well that has been cased and cemented is disclosed. An acoustic signal is transmitted into the formation from a pulse-echo transducer...
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5619475 |
Method of predicting mechanical failure in formation utilizing stress derivatives which measure formation nonlinearity
A method for determining whether a formation is subject to incipient failure are disclosed. The method comprises determining in situ a nonlinear parameter of a formation, and determining whether...
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5544127 |
Borehole apparatus and methods for measuring formation velocities as a function of azimuth, and interpretation thereof
Borehole tools are provided with at least one transmitter which generates acoustic waves at a plurality of azimuthal locations about the borehole, and at least one receiver which receives and...
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5475650 |
Measurement of nonlinear properties of formation using sonic borehole tool while changing pressure in borehole
A method of investigating a formation traversed by a borehole includes, measuring at a plurality of different static borehole pressures the acoustic Stoneley and/or flexural wave velocities of...
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5467320 |
Acoustic measuring method for borehole formation testing
An acoustic formation apparatus is set forth. It utilizes the drill bit on a drill stem as the acoustic source. At a common azimuth and spaced vertically along the drill stem, first and second...
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5450371 |
Statistical analysis of regional velocities
A multi-dimensional assemblage of time/velocity functions are sampled for velocity as a function of incremental time. The samples are stored in a matrix arranged in columns along the time axis and...
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5448916 |
Method and device for three dimensional measuring of surface
A measuring technique for producing a three-dimensional image and information relating to the type of sand, clay or gravel which defines a wall or walls of a deep concealed underground excavation...
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5398215 |
Identification of stress induced anisotropy in formations
Low and high frequency flexural waves or their equivalents are generated with dipole or other source transducers. From measurements made at receiving transducers which are oriented at two...
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5343440 |
Geopressure analysis system
Seismic data is combined with well log data to generate a two-dimensional geopressure prediction display; this permits deviated and horizontal well planning plus lithology detection. Shale fraction...
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5233567 |
Method for determining the path of a borehole
A method is provided for determining the path of a borehole relative to a seismic section. The borehole extends through subsurface formation layers which are seismic boundaries and appear as...
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5214251 |
Ultrasonic measurement apparatus and method
Pulse echo apparatus and methods are disclosed for measuring characteristics of a borehole while it is being drilled. A component of a bottomhole assembly, preferably a drilling collar, is provided...
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5200928 |
Method for using mode converted P- to S- wave data to delineate an anomalous geologic structure
A method for using mode converted P- or S- wave data to delineate the surface of an anomalous geologic structure such as a salt dome is disclosed. Seismic wavefields are propagated from near the...
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5103428 |
Method for optimizing well production rates
A method and apparatus for laboratory simulation of the dynamic formation of sand arches in production of oil and/or gas from unconsolidated or poorly consolidated wells is disclosed. An ultrasonic...
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5081611 |
Methods for determining formation and borehole parameters via two-dimensional tomographic reconstruction of formation slowness
Methods are provided for determining the axial and radial slowness of a formation traversed by a borehole via utilization of sonic data obtained from a sonic borehole tool having a plurality of...
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5076100 |
Magnetostrictive transducer measuring system
A magnetostrictive transducer measuring system for precisely measuring the liquid level of fuel in an underground tank. The system provides for the measurement of the position of one or more...
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5058078 |
Method and apparatus for determining compressional first arrival times from waveform threshold crossing provided by apparatus disposed in a sonic well tool
A well logging system includes a digital threshold crossing data generation system (TCDG System) disposed in a well tool, adapted to be disposed in a borehole, and a digital first motion detection...
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4982381 |
Method and device for acquiring and processing signals obtained in wells and particularly in horizontal wells
A method is disclosed for acquiring and processing logs obtained by a well-logging tool moved in a well, providing better discrimination between the discontinuities of the sub-soil oriented...
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4964085 |
Non-contact borehole caliber measurement
A method and apparatus for measuring the caliber of a borehole while drilling utilizes a borehole compensated downhole measuring system in both a compensated and a non-compensated manner. A...
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4930109 |
Method and apparatus of measuring ultrasonic time travel information obtained from logging operations in a well borehole
A method for measuring time of travel information of an acoustic return obtained from borehole logging operations avoids the phenomena of cycle skipping. The time of travel is determined from a...
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4918669 |
Method and apparatus for sonic dip measurement
A method and apparatus are disclosed for measurement of earth formation dip utilizing sonic techniques. At least three electroacoustic devices are utilized, each having an electroacoustic...
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4899144 |
Method of transmitting ultrasonic amplitude & time travel information over a logging cable
A method for transmitting ultrasonic amplitude and time travel information obtained from borehole logging operations over a logging cable allows accurate measurement of the time travel by surface...
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4855963 |
Shear wave logging using acoustic multipole devices
The multipole shear wave logging device of this invention includes a logging sonde, means for generating a 2 n -pole shear wave in an earth formation surrounding a borehole containing liquid where...
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4853901 |
Automatic liquid level recording device
Apparatus and method for obtaining from a well drilled into the subsurface of the earth the information necessary to determine the location of the liquid surface in same. A source of pressure...
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4845616 |
Method for extracting acoustic velocities in a well borehole
In an acoustic well logging apparatus including one or two transmitters and having a pair of spaced apart receivers, two interval transit times are measured independently through a common zone of...
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4843598 |
Method of shear wave porosity logging of a subsurface formation surrounding a cased well
The porosity of a formation surrounding a cased well is determined from a shear wave log of the formation. Shear wave velocity is derived from the log and formation porosity is identified from a...
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4833658 |
Method of seismic prospecting with very high resolution in horizontal boreholes
A method of seismic prospecting with very high resolution as applicable in particular to exploitation of a productive hydrocarbon deposit essentially consists in transmitting and receiving acoustic...
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