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| Number | Title | Issue Date |
| 7660195 | Attenuation mapping apparatus, systems, and methods In some embodiments, an apparatus and a system, as well as a method and an article, may include generating attenuation values associated with a set of multiple signals received by multiple receivers from a transmitted signal as a function of reception time and mater... | 02/09/2010 |
| 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 |
| 7337068 | Global classification of sonic logs A method of determining the sonic slowness of a formation traversed by a borehole comprising generating tracks from sonic waveform peaks received at a plurality of depths wherein the peaks that are not classified prior to tracking is set forth. A method for generati... | 02/26/2008 |
| 7089119 | Acoustic signal processing method using array coherency A system and method is provided for characterizing earth formations. In one embodiment, the method includes passing a logging tool through a borehole and repeatedly: (a) triggering an acoustic wave generator; (b) recording acoustic waveforms received by receivers in... | 08/08/2006 |
| 7013217 | System and method for determining formation slowness The invention provides techniques for calculating velocity from sonic signals with an improved signal to noise ratio, accuracy and certainty of result. Multichannel coherence measures are calculated from sonic transmitter signals and averaged to produce an average c... | 03/14/2006 |
| 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 echo signal transit time distributions are then determined in a plurali... | 05/10/2005 |
| 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 |
| 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 |
| 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 |
| 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 equipment. The time travel information is transmitted by a ... | 02/06/1990 |
| 4893285 | Method and apparatus for cement bond tool In accordance with principles of the present invention methods and apparatus are provided for evaluating the quality of the cement bond in cased boreholes. Acoustic energy is used to excite the borehole-casing-annulus-formation system and the quality of t... | 01/09/1990 |
| 4813026 | Method for logarithmic analysis of seismic reflection signals A seismic marine survey is carried out by traversing a line of exploration with an acoustic energy source, an array of spaced-apart receivers, and a recording system. Seismic reflection signals recorded by the receivers are digitized to provide a pluralit... | 03/14/1989 |
| 4780858 | Borehole televiewer mudcake monitor In connection with a borehole televiewer system (10), the delta time (51) between low threshold (54) crossing (T1) and signal peak arrival (T2) provides a measure of mudcake (43) thickness.... | 10/25/1988 |
| 4777629 | Method and apparatus for detecting the peak of an analog signal A method and apparatus for processing a signal generated by a borehole scanning system of the type in which periodic electrical firing pulses initiate a plurality of corresponding acoustic energy pulses which are transmitted from the central portion of th... | 10/11/1988 |
| 4764903 | Method and apparatus to determine permeability of rock formations adjacent a borehole A method and apparatus for determination of earth formation permeability in situ. A logging sonde supported in a borehole derives attenuation data from at least two ultrasonic energy transmission paths which have a common alignment but differing length, t... | 08/16/1988 |
| 4757479 | Method and apparatus for cement bond logging In accordance with principles of the present invention methods and apparatus are provided for evaluating the quality of the cement bond in cased boreholes. Acoustic energy is used to excite the borehole-casing-annulus-formation system and the quality of t... | 07/12/1988 |
| 4701891 | Method and apparatus for measuring formation compression and shear wave velocity Method and apparatus for measuring formation compressional and shear wave velocities characterized by a downhole tool having an attenuation chamber between a transmitter and a receiver and a plurality of receivers spaced from the transducer so as to discr... | 10/20/1987 |
| 4658383 | Automatic gain control of digitized full trace acoustic signal in a borehole For use in a downhole acoustic logging system including an acoustic transmitter and spaced acoustic receiver, the preferred and illustrated embodiment incorporates a gain control for the receiver system. The automatic gain control (AGC) controls data capt... | 04/14/1987 |
| 4592030 | Method of seismic exploration by acoustic well logging The invention relates to a method of seismic exploration by acoustic well logging. It is characterized in that in the traces recorded corresponding to each transmitter-receiver pair, each type of wave of interest is identified using the results of a veloc... | 05/27/1986 |
| 4543648 | Shot to shot processing for measuring a characteristic of earth formations from inside a borehole A method and apparatus for measuring an earth formation characteristic from inside a borehole penetrating earth formations is described. A tool carrying a sonic transmitter and an array of receivers is moved along the borehole and waveform signals from th... | 09/24/1985 |
| 4495605 | Method for determining the dip angle of geological formations traversed by a borehole Acoustic signals are transmitted in a direction substantially perpendicular to the borehole axis, from different levels of at least three determined generatrices of the borehole wall. Reflected acoustic signals are received from the same direction at diff... | 01/22/1985 |
| 4479204 | Method of monitoring the spacial production of hydrocarbons from a petroleum reservoir In the injection of fluids into subsurface geological formations, such as for the purpose of recovering a mineral in that formation, it is important that the flow progress of that fluid is known at all points in the subsurface. This information is provide... | 10/23/1984 |
| 4402068 | Method and apparatus for acoustic well logging An improved well logging technique is provided for more accurately deriving acoustic measurements of sub-surface earth formations. Method and apparatus are described for converting an acoustic signature which can be generated on a depth dependent or time ... | 08/30/1983 |
| 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 |
| 4210965 | Acoustic well logging method and apparatus for detecting and measuring an acoustic wave A method and apparatus are described for detecting an acoustic wave in a waveform produced from a sonic receiver in response to an acoustic investigation of a borehole. The maximum amplitude of the waveform is measured and a portion thereof utilized as a ... | 07/01/1980 |
| 4123744 | Method and apparatus for dynamically investigating a borehole An apparatus and method for investigating a borehole with energy transmissions whose directivity is varied in real time during the investigation is described. A plurality of transmitters are employed on a well logging tool with at least one receiver locat... | 10/31/1978 |
| 3968499 | Apparatus for producing continuous graphic displays from intermittantly sampled data The minimum and maximum values attained by an analog data signal in each of successive sampling periods are determined by alternately operative amplitude detectors which produce and store a corresponding minimum and maximum signal for each of these period... | 07/06/1976 |
