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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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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 |
| 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 |
| 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 |
| 7301473 | Receiver for an acoustic telemetry system One embodiment includes a method comprising receiving an acoustic signal that is propagated along a drill string. The method also includes correlating the acoustic signal to a first stored acoustic signal representing a first symbol, wherein the first stored acousti... | 11/27/2007 |
| 7279677 | Measuring wellbore diameter with an LWD instrument using compton and photoelectric effects A method for determining the diameter of a wellbore, the wellbore being drilled by a drill string immersed in weighted mud, the weighted mud having a significant weight fraction of a heavy component. A well logging instrument having a gamma ray source and energy-sen... | 10/09/2007 |
| 7265553 | Method and apparatus for imaging earth formation The invention concerns an apparatus for investigating the wall of a borehole tilled with non-conductive mud, said apparatus comprising: a pad having an inside face and an outside face for pressing against the wall of the borehole; a set of measurement electrodes mou... | 09/04/2007 |
| 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 |
| 7256582 | Method and apparatus for improved current focusing in galvanic resistivity measurement tools for wireline and measurement-while-drilling applications A galvanic resistivity tool with one or more measurement electrodes and guard electrodes, and one or more shielding electrodes. The potential difference between the measurement electrodes and the guard electrodes is controlled to minimize current flow between the me... | 08/14/2007 |
| 7250768 | Apparatus and method for resistivity measurements during rotational drilling A resistivity sub including a resistivity sensor forms part of a bottom hole drilling assembly. The sensor is maintained at a substantially fixed offset from the wall of a borehole during drilling operations by, for example, a stabilizer. In WBM, galvanic sensors ma... | 07/31/2007 |
| 7228903 | Apparatus and method for wireline imaging in nonconductive muds A pad mounted resistivity imaging device includes at least one transmitter and two or more arrays of receivers. Analysis of the received signals is done using either amplitude and phase differences between the arrays of receivers, or by analyzing amplitude and phase... | 06/12/2007 |
| 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 |
| 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 |
| 6978672 | Wireline apparatus for measuring steaming potentials and determining earth formation characteristics 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 ... | 12/27/2005 |
| 6925031 | Method of using electrical and acoustic anisotropy measurements for fracture identification Measurements made by a cross-dipole acoustic logging tool in a borehole are processed to determine the principal directions of azimuthal anisotropy of a subsurface formation. Measurements indicative of azimuthal resistivity variations are also made with a multicompo... | 08/02/2005 |
| 6920083 | Method intended for detection and automatic classification, according to various selection criteria, of seismic events in an underground formation A method for automatic classification, according to various selection criteria, of seismic or microseismic events picked up by seismic receivers coupled with an underground formation under development, according to whether the events are purely of microseismic natur... | 07/19/2005 |
| 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 |
| 6915875 | Acoustic isolator for 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... | 07/12/2005 |
| 6837332 | Method and apparatus for cancellation of unwanted signals in MWD acoustic tools An apparatus (10) and method are disclosed for eliminating a noise signal from at least one source during an acoustic measurement of a subsurface geological formation or borehole. The apparatus (10) includes a longitudinal body for positioning in the b... | 01/04/2005 |
| 6643220 | Vapor handling in printing Apparatus and methods are disclosed for enabling vapor handling in printing. In certain implementations, for example, one or more volatiles emitted during an ink-based printing process may be condensed into one or more liquids. The one or more liquids may... | 11/04/2003 |
| 6630890 | Methods, systems and tools for borehole logging A borehole logging tool system includes a surface system, a logging array, and a logging cable providing power supply and data paths connecting the logging array to the surface system, wherein the logging array includes a series of discrete sondes connect... | 10/07/2003 |
| 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 measured. The borehole standoff is utilized to compensated data co... | 09/09/2003 |
| 5780784 | Cancellation of tool mode signal from combined signal A system for eliminating the tool mode signal from a received combined signal comprising both tool mode and formation mode components, comprising: a formation receiver for receiving said combined signal, a reference receiver for receiving a tool mode refe... | 07/14/1998 |
| 5724308 | Programmable acoustic borehole logging A downhole acoustic logging tool having a random access memory for storing acoustic waveforms in digital format. The waveforms being transmitted from a surface logging system to the random access memory in the downhole logging tool. The logging tool playi... | 03/03/1998 |
| 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 |
| 5541890 | Method for predictive signal processing for wireline acoustic array logging tools A method of determining the acoustic propagation velocity of an earth formation penetrated by a wellbore by processing signals from an array acoustic wellbore logging tool. The tool includes a transmitter and a plurality of receivers axially spaced apart ... | 07/30/1996 |
| 5502686 | Method and apparatus for imaging a borehole sidewall A method for concurrently gathering acoustic and resistivity data for mapping the texture of the sidewall of a borehole using a single imaging tool. The data are sampled, formatted and merged to provide a single composite image of the borehole sidewall.... | 03/26/1996 |
| 5289433 | Acoustic multi-mode wide-band logging device A multi-mode receiver sonde having individual receiver stations. The receiver stations have transducers which have a flat frequency response over a selected bandwidth so that there is an approximately constant ratio in amplitude and substantially little p... | 02/22/1994 |
| 5278805 | Sonic well logging methods and apparatus utilizing dispersive wave processing Methods and related apparatus for conducting shear slowness logging are set forth. The methods broadly comprise: detecting dispersive waves such as flexural or Stoneley waves; Fourier transforming the received signals; backpropagating the Fourier transfor... | 01/11/1994 |
| 5226017 | Method and apparatus for acquiring borehole seismic data in two opposite directions The invention relates to a method and apparatus for acquiring borehole seismic data in two opposite directions in a borehole. Acquisition consists in emitting a pressure wave (R, R') at a point (E) in the borehole (PU), and, at a point (R) in the borehole... | 07/06/1993 |
| 5159577 | Technique for reducing whirling of a drill string Improved techniques are provided for correcting signals from a downhole sensor on a drill collar eccentrically rotating within a borehole. The corrected sensor signal may be used to generate a well log which more accurately represents the conditions which... | 10/27/1992 |
| 5159578 | Apparatus for rotating a transducer assembly of a borehole logging tool in a deviated borehole A borehole logging tool having a dipole acoustic energy source and at least one spaced-apart dipole acoustic energy receiver is lowered into a deviated borehole. A motor rotates the source and receiver about the axis of the borehole tool. A first signal i... | 10/27/1992 |
| 5130950 | Ultrasonic measurement apparatus 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... | 07/14/1992 |
| 5124952 | Formation fracture detection using instantaneous characteristics of sonic waveforms A method for enhancing a plurality of recorded waveforms from sonic logging is disclosed. As a function of depth along a well borehole, a plurality of sonic waveforms is obtained. Adjacent waveforms are registered by time shifting so that common event coi... | 06/23/1992 |
| 5058077 | Compensation technique for eccentered MWD sensors The technique according to the present invention is useful for generating a corrected well log which otherwise would include erroneous signals from downhole sensor. Such signal error may be caused, for example, by periodic movement of the drill collar axi... | 10/15/1991 |
| 5010527 | Method for determining the depth of a hydraulic fracture zone in the earth The depth of a hydraulic fracture zone is determined by sensing and recording seismic wave motion at a series of spaced depths in a portion of a bore hole subjected to fracturing pressure during a shut-in period after the application of pressure while the... | 04/23/1991 |
| 4985873 | Method and apparatus for determining compressional first arrival times from waveform threshold crossings 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 (DFMD) software disposed in a memory of a well truck compu... | 01/15/1991 |
| 4951266 | Method of filtering sonic well logging data The present invention is directed to filtering out unwanted components contained in acquired sonic well logging data, e.g., reflected wave components, converted wave components, casing arrivals, tool arrivals and/or noise. In the filtering method, the wav... | 08/21/1990 |
| 4901289 | System for acquiring and recording signals delivered by a set of sensors disposed in well probes A system is provided for acquiring and recording signals delivered by a set of sensors disposed in one or more probes lowered into a well at the end of a multi-function cable. The different signals to be transmitted are multiplexed before being applied to... | 02/13/1990 |
| 4875197 | Method and apparatus for determining propagation velocities of elastic waves in a borehole A method of measuring the propagation velocity of one or more of a plurality of different types of elastic waves in a borehole. It employs a source of elastic waves at a given location in a borehole. The elastic waves generated have a given known frequenc... | 10/17/1989 |
| 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 |
