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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 |
| 7382683 | Computing an absorption parameter for a mode-converted seismic wave To survey a subterranean structure, measured seismic data is processed using an algorithm for deriving a single-mode absorption parameter. A first absorption parameter for a mode-converted seismic wave is computed based on an output of the algorithm. The first absor... | 06/03/2008 |
| 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 |
| 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 |
| 7310580 | Method for borehole measurement of formation properties The present invention is a method of estimating formation properties by analyzing acoustic waves that are emitted from and received by a bottom hole assembly. A bottom hole assembly may be deployed in a borehole to estimate formation properties. From the bottom hole... | 12/18/2007 |
| 7289909 | Method for borehole measurement of formation properties The present invention is a method of estimating formation properties by analyzing acoustic waves that are emitted from and received by a bottom hole assembly. A bottom hole assembly may be deployed in a borehole to estimate formation properties. From the bottom hole... | 10/30/2007 |
| 7280432 | Oscillating shear valve for mud pulse telemetry An oscillating shear valve system for generating pressure fluctuations in a flowing drilling fluid comprising a stationary stator and an oscillating rotor, both with axial flow passages. The rotor oscillates in close proximity to the stator, at least partially block... | 10/09/2007 |
| 7150317 | Use of electromagnetic acoustic transducers in downhole cement evaluation A bond log device comprising a sonde, an acoustic transducer, and an acoustic receiver. The acoustic transducer is comprised of a magnet combined with a coil, where the coil is energizable by an electrical current source. The acoustic transducer can also be comprise... | 12/19/2006 |
| 7110323 | Method, system and apparatus for interpreting seismic data using duplex waves A Method for Interpreting Seismic Data Using Duplex Waves is described. Whereas substantially horizontal boundaries are readily identified using conventional processing methods based on primary reflections, it has been difficult or impossible to use such methods for... | 09/19/2006 |
| 7095676 | Assessing a solids deposit in an oilfield pipe Tube waves are used to locate and characterize a solids deposit inside a fluid-filled pipe. An acoustic tube wave pulse is transmitted along the pipe. On encountering a solids deposit, the tube wave pulse is perturbed and partially reflected by changes in the bounda... | 08/22/2006 |
| 7079449 | Methods and systems for low frequency seismic and infrasound detection of geo-pressure transition zones Methods for determining the existence and characteristics of a gradational pressurized zone within a subterranean formation are disclosed. One embodiment involves employing an attenuation relationship between a seismic response signal and increasing wavelet waveleng... | 07/18/2006 |
| 7062386 | Method to estimate the mechanical properties of a solid material subjected to isonification A method for measuring the complex frequency-dependent dilatational and shear wavespeeds of a slab of material subjected to insonification. Transfer functions that are obtained by insonifying the material at different angles. Once this is accomplished, the transfer ... | 06/13/2006 |
| 7026951 | Data telemetry system for multi-conductor wirelines An improved data telemetry system for multi-conductor wirelines to achieve satisfactory 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 firs... | 04/11/2006 |
| 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 effective logging tool modulus by modeling the logging tool as a fluid... | 07/19/2005 |
| 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 |
| 6842400 | Acoustic logging apparatus and method The specification discloses a system and related method for determining characteristics of earth formations traversed by a borehole. An acoustic transmitter mounted on a tool, whether that tool is a wireline tool or a logging-while-drilling tool, imparts acoustic en... | 01/11/2005 |
| 6739692 | Ink jet recording apparatus The present invention provides an ink jet recording apparatus including a carriage to which a recording head for effecting recording on a recording material by discharging ink and an ink tank for containing ink to be supplied to the recording head are detachably mou... | 05/25/2004 |
| 6473695 | Method for direct hydrocarbon reservoir detection and delineation by low frequency acoustic spectroscopy A method for detecting and identifying a type and geometric dimensions of hydrocarbon deposits and other underground fluid deposits. Sensors are used to measure anomalies caused by a deposit in a natural earth frequency spectrum. Different frequencies are... | 10/29/2002 |
| 6205087 | Sonic data logging system A sonic logging method involves the pre-processing of a detection signal by a downhole processing device to determine the arrival time of a sonic signal at a receiver which is then transmitted to the surface. A suitable sonic logging downhole tool include... | 03/20/2001 |
| 6188643 | Method and apparatus for inspecting well bore casing An improved technique for determining the thickness of a member, especially pipe such as fluid-filled casing in an earth borehole, includes the following steps: directing a pulse of ultrasonic energy toward the inner surface of the pipe, and receiving and... | 02/13/2001 |
| 6175536 | Cross-well seismic mapping method for determining non-linear properties of earth formations between wellbores A method for determining a degree of acoustic non-linearity of an earth formation from seismic signals transmitted into the formation from within one wellbore and received from the formation in another wellbore. The seismic signals include two selected di... | 01/16/2001 |
| 6084825 | Apparatus and methods for seismic data processing A method of determining an optimum processing sequence by calculation of processing sequence sensitivity and processing sequence error. A reference seismic processing sequence is applied to input raw gathers to obtain reference seismic output data. A seri... | 07/04/2000 |
| 6018495 | Method of borehole compensation of earth formation characteristic measurements using depth measurements A method is disclosed for borehole compensation of measurements of earth formations penetrated by a borehole including differential time (Ɗt) measurements obtained from a borehole tool in the formation. The borehole tool includes at least one transmitter... | 01/25/2000 |
| 5999485 | Method of distinguishing geological sequences and their boundaries A method for identifying the boundaries between sequences of rocks laid down in different depositional regimes. The approach used is to search, in well logs or seismic data, for a statistic characteristic of such regimes, and for breaks in that statistic.... | 12/07/1999 |
| 5784333 | Method for estimating permeability of earth formations by processing stoneley waves from an acoustic wellbore logging instrument A method for determining the permeability of earth formations penetrated by a wellbore from acoustic signals measured by an acoustic wellbore logging instrument. The method includes separating components from the measured acoustic signals which represent ... | 07/21/1998 |
| 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 |
| 5485431 | Measurement of nonlinear formation parameters using sonic borehole tool Methods and apparatus are provided for determining an indication of a nonlinear property of the formation. A sonic tool is used in a borehole to generate a signal having multiple cycles of a wave of a predetermined frequency. The amplitude of a tube wave ... | 01/16/1996 |
| 5416750 | Bayesian sequential indicator simulation of lithology from seismic data A discretized lithologic model of the subsurface is defined by a regular array of pixels. Each pixel corresponds to one of a finite number of possible lithoclasses such as sand, shale or dolomite. The lithoclasses are unknown except at a small number of s... | 05/16/1995 |
| 5361239 | Compensation method using a single transmitter measurement tool A method for borehole compensation using a single transmitter measurement electromagnetic propagation tool is disclosed. Phase shift and attenuation are measured at each of three positions relative to a measurement depth. The measurements are used to calc... | 11/01/1994 |
| 5229552 | Method and apparatus for the downhole measurement of elastic rock properties A method and apparatus by which elastic properties of rock formations are determined includes a downhole logging device which has two internal accelerometers mounted within to measure the acceleration of the device. A reference displacement of the device ... | 07/20/1993 |
| 5222048 | Method for determining borehole fluid influx Fluid influx in a borehole is determined by examining and monitoring the computed transfer function in the signal channel defined by the annulus between the borehole and a drillstring in the borehole.... | 06/22/1993 |
| 5216638 | Method and apparatus for the acoustic investigation of a casing cemented in a borehole Method for determining at least one characteristic of a casing cemented in a borehole, such as cement bond and casing thickness, from a reflected acoustic signal S(t) obtained by directing an acoustic pulse at a substantially normal incidence towards a ra... | 06/01/1993 |
| 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 with one or more ultra-sonic transceivers. A pulse echo s... | 05/25/1993 |
| 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 |
| 5138585 | Method for fluid identification and evaluation within wellbores using ultrasonic scanning A method is disclosed for using data from a borehole televiewer in an active well to determine fluid properties. That method involves determining the wall effects from the data, and factoring out the wall effects from the data to determine the fluid prope... | 08/11/1992 |
| 4951267 | Method and apparatus for multipole acoustic logging Apparatus for shear wave borehole logging has a source section 30, a spacer section 32, a detector section 34 and a coupling section 36, adjacent sections being linked by isolation joints 38. The source section 30 has a slotted steel housing 48 containing... | 08/21/1990 |
| 4896303 | Method for cementation evaluation using acoustical coupling and attenuation Acoustical coupling is proposed as a means of determining the presence and acoustical impedance of materials behind casing in cementation evaluation. Expressions for computing coupling and attenuation in multi-receiver/transmitter logging systems are anal... | 01/23/1990 |
| 4888740 | Differential energy acoustic measurements of formation characteristic A method for acoustically investigating characteristics of formations penetrated by a borehole such as fractures by taking differential Stoneley wave acoustic energy measurements between pairs of receivers of an array of receivers carried by a logging too... | 12/19/1989 |
| 4881207 | Seismic prospection method providing improved knowledge of the geological discontinuities of the subsoil A seismic prospection method is provided giving better knowledge of the position and of the nature of the geological discontinuities of the subsoil, consisting essentially in picking up seismic waves which are propagated in the ground by means of one or m... | 11/14/1989 |
