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| Number | Title | Issue Date |
| 8130591 | Downhole measurements of mud acoustic velocity One or more acoustic transducers are used to measure ultrasonic velocities in the mud in the interior channel of a drill collar. Corrections may be applied for temperature and/or fine grain drill cuttings to get the ultrasonic velocity in the annulus between the dri... | 03/06/2012 |
| 8077545 | Method for detecting gas influx in wellbores and its application to identifying gas bearing formations A method for identifying gas in a wellbore includes imparting acoustic energy into the wellbore at a first selected position and detecting the acoustic energy at a second position in the wellbore spaced apart from the first position. Acoustic velocity of fluid in th... | 12/13/2011 |
| 7924652 | Method for determining seismic anisotropy The method disclosed is useful for estimating anisotropic properties of an earth formation. The method includes extracting travel time values of components of the acoustic wave induced from a downhole tool and reflected from a boundary bed formation. The method furt... | 04/12/2011 |
| 7911877 | Active noise cancellation through the use of magnetic coupling Passive suppression of casing signals is used to improve the ability to measure formation velocities. Passive suppression includes the use of a magnet slidably coupled to the casing. ... | 03/22/2011 |
| 7885142 | Method and apparatus for logging foam cement in cased boreholes An acoustic logging system that measures distribution of foam cement and other material in a casing-borehole annulus. The distribution is preferably displayed as map. A borehole tool utilizes at least one acoustic transducer with a known frequency response and mount... | 02/08/2011 |
| 7813220 | Method and apparatus for long term seismic monitoring A method and apparatus for deploying seismic detectors and monitoring seismic activity associated with a production well from a down hole location within a well. ... | 10/12/2010 |
| 7773454 | Method and apparatus for cement evaluation using multiple acoustic wave types A method and apparatus useful to determine the integrity of a cement bond log disposed in the annular space between a casing and a wellbore. The method and apparatus produce a transversely polarized shear wave and emit the wave through the casing and into the wellbo... | 08/10/2010 |
| 7755973 | Ultrasonic logging methods and apparatus for automatically calibrating measures of acoustic impedance of cement and other materials behind casing Methods and apparatus for in situ, continuous, automatic, and real-time acoustic impedance calibration of a transducer in an acoustic logging system. By taking the frequency characteristics of the ultrasonic transducer which are present in the internal casing reflec... | 07/13/2010 |
| 7710823 | Resistivity measurement through metal casing using magnetic field and magnetoacoustic phenomena Measurements of acoustic velocities are made through a case borehole in the absence and presence of an applied magnetic field. A formation resistivity parameter may be estimated from differences in the acoustic velocities. ... | 05/04/2010 |
| 7675814 | Method and apparatus for generating acoustic signals with a single mode of propagation A method and apparatus for generating an acoustic signal having a single mode of propagation along borehole walls. The method includes generating an n-pole (monopole, dipole, quadrupole, and so on) acoustic signal and calculating the tool position and borehole shape... | 03/09/2010 |
| 7663969 | Use of Lamb waves in cement bond logging A method and apparatus useful to determine the integrity of a cement bond log disposed in the annular space between a casing and a wellbore. The method and apparatus induce a Lamb wave in the casing and into the wellbore. The Lamb wave attenuates upon passage throug... | 02/16/2010 |
| 7660197 | System for measuring stress in downhole tubulars An apparatus for evaluating a tubular in a borehole of includes at least two electromagnetic acoustic transducers. The transducers are configured to generate and receive first and second acoustic waves in the tubular. A difference in velocity of the two acoustic wav... | 02/09/2010 |
| 7656747 | Ultrasonic imaging in wells or tubulars An ultrasonic imaging method is provided. A wideband acoustic pulse is fired at a wall. A wideband response signal is received. The wideband response signal is processed to select an impedance measurement frequency. A wavelet having a characteristic frequency approx... | 02/02/2010 |
| 7649804 | In-situ determination of yield stress state of earth formations Determination of in-situ rock yield stress state of a geological formation surrounding a borehole includes determining a profile for each of an axial effective, a radial effective, and a hoop effective stress within at least one axial plane containing a borehole axi... | 01/19/2010 |
| 7639562 | Active noise cancellation through the use of magnetic coupling Passive and active suppression of casing signals is used to improve the ability to measure formation velocities. Passive suppression includes the use of a magnet slidably coupled to the casing. Active suppression uses measurement of casing signals to control the out... | 12/29/2009 |
| 7639563 | Method for sonic indication of voids in casing cement A method for determining on a real time logging while drilling (LWD) basis the top of cement location between casing transition zones in a borehole using at least one sonic attributes of coherent energy, attenuation and slowness as a function of at least one of dept... | 12/29/2009 |
| 7626886 | P-wave anisotropy determination using borehole measurements A phased array of transducers is used to generate elastic waves into the earth formation in a selected direction. The impedance measured at the input to the transducer array is indicative of the elastic impedance of the earth formation in the selected direction.... | 12/01/2009 |
| 7525872 | Method and apparatus for cement bond evaluation using transversely polarized shear waves A method and apparatus useful to determine the integrity of a cement bond log disposed in the annular space between a casing and a wellbore. The method and apparatus produce a transversely polarized shear wave and emit the wave through the casing and into the wellbo... | 04/28/2009 |
| 7522471 | Multimode acoustic imaging in cased wells A well casing is insonified with a first acoustic wave in a first mode that may be any mode of a set including: extensional mode, thickness mode, flexural mode. A first echo is received at a first acoustic transducer for receiving, a first signal is produced and a f... | 04/21/2009 |
| 7495995 | Method and apparatus for investigating a borehole with a caliper Embodiments of the present invention relate to a caliper and method for mapping the dimensions and topography of a formation such as the sidewall of a borehole. Examples of formations in which embodiments of the invention can be used include, but are not limited to,... | 02/24/2009 |
| 7486589 | Methods and apparatus for predicting the hydrocarbon production of a well location Methods and apparatus that use microseismic event data, stress data, seismic data, and rock properties to predict the hydrocarbon production success of a well location are disclosed. An example method generates a hydrocarbon production function based on information ... | 02/03/2009 |
| 7460436 | Apparatus and method for hydraulic fracture imaging by joint inversion of deformation and seismicity A method for hydraulic fracture imaging consistently integrates ground deformation data and microseismic data. A time sequence of hydraulic fracture images is computed from the combined data by first computing an orientation and location of the fracture. A size of t... | 12/02/2008 |
| 7414918 | Method for normalizing signals in a cement bond logging tool A longitudinally segmented acoustic transducer for a cement bond logging (CBL) tool having a plurality of adjoining PZT ring-like segments driven synchronously in parallel by one or more pulses and caused to vibrate in an anti-resonant mode, substantially below the ... | 08/19/2008 |
| 7411864 | Method for processing signals in a cement bong logging tool A longitudinally segmented acoustic transducer for a cement bond logging (CBL) tool having a plurality of adjoining PZT ring-like segments driven synchronously in parallel by one or more pulses and caused to vibrate in an anti-resonant mode, substantially below the ... | 08/12/2008 |
| 7372777 | Sonic instrumentation apparatus and method for cement bond logging A longitudinally segmented acoustic transducer for a cement bond logging (CBL) tool having a plurality of adjoining PZT ring-like segments driven synchronously in parallel by one or more pulses and caused to vibrate in an anti-resonant mode, substantially below the ... | 05/13/2008 |
| 7350585 | Hydraulically assisted tubing expansion A method of expanding tubing comprises applying a varying fluid pressure across the wall of the tubing. The variation in pressure may be achieved by varying one or both of the fluid pressure within the tubing and the fluid pressure externally of the tubing. A body o... | 04/01/2008 |
| 7350568 | Logging a well A method for logging a well. Includes receiving energy with at least one array of elements coupled to a drill bit, wherein the at least one array of elements functions as an electronic array. An apparatus for logging a well includes a drill bit and at least one arra... | 04/01/2008 |
| 7339494 | Acoustic telemetry transceiver One embodiment includes an apparatus that includes a piezoelectric transducer to generate an acoustic signal that is to modulate along a mandrel, wherein the piezoelectric transducer includes at least one piezoelectric element and at least one electrode that is with... | 03/04/2008 |
| 7322410 | Controllable production well packer An apparatus and method for operating an electrically powered device in a packer using the piping structure of the well as an electrical conductor for providing power and/or communications. The electrically powered device may comprise an electrically controllable va... | 01/29/2008 |
| 7313481 | Methods and devices for analyzing and controlling the propagation of waves in a borehole generated by water hammer A method for simulating water-hammer waves in a borehole is used to estimate formation parameters such as porosity and permeability, and to design completion strings. The simulation method uses a model that has a plurality of layers, at least one of the layers inclu... | 12/25/2007 |
| 7301852 | Methods of generating directional low frequency acoustic signals and reflected signal detection enhancements for seismic while drilling applications The present invention provides a method and apparatus for using an acoustic logging tool conveyed in a borehole in an earth formation for determining a characteristic of the formation. The method comprises using a first acoustic source for generating an acoustic sig... | 11/27/2007 |
| 7292942 | Measuring formation density through casing A method of determining formation density in a cased hole environment using a logging tool having a gamma ray source, a long spacing detector, and a short spacing detector that includes developing one or more cased hole calibration relationships that utilize differe... | 11/06/2007 |
| 7286006 | Sign-sign least means square filter In some embodiments, an adaptive filter employs two adaptation modes, where during one adaptation mode the adaptive filter is updated only when the received training sample is a first binary value and during the other adaptation mode the adaptive filter is updated o... | 10/23/2007 |
| 7286937 | Estimating formation properties from downhole data Methods and systems for extracting formation properties from formation logging data is disclosed. A method includes obtaining a deconvolution filter; and processing the formation logging data using the deconvolution filter to produce estimates of the formation prope... | 10/23/2007 |
| 7283910 | Incremental depth measurement for real-time calculation of dip and azimuth The present invention provides a method and apparatus for logging an earth formation and acquiring subsurface information wherein a logging tool is conveyed in borehole to obtain parameters of interest. The parameters of interest obtained may be density, acoustic, m... | 10/16/2007 |
| 7273097 | Formation characterization using wellbore logging data Methods for determining formation characteristics comprising establishing baseline casing conditions for a string of casing disposed within a wellbore in a formation and measuring updated casing conditions for the string of casing at a first time interval from the e... | 09/25/2007 |
| 7274990 | Downhole library of master wavelets for VSP-while-drilling applications A controllable seismic source is used in a seismic-while-drilling system for obtaining VSP data. Coded information is sent downhole about the signal generated by said controllable source. The information about the seismic source is used for reconstructing the source... | 09/25/2007 |
| 7272504 | Real-time imaging while drilling Measurements made by a formation evaluation sensor downhole are processed to produce an image and a bitstream characterizing the image is transmitted uphole. The parameters used in the downhole processing are dynamically alterable. ... | 09/18/2007 |
| 7263029 | System and method for acquiring seismic and micro-seismic data in deviated wellbores Methods and apparatus are adapted for acquiring seismic data from an array of sensors deployed along a section of a deviated, including horizontal, wellbore for monitoring seismic and microseismic activity. The sensors may be permanently deployed in the wellbore. | 08/28/2007 |
| 7259688 | Wireless reservoir production control A reservoir production control system includes a plurality of wells for producing a reservoir linked to a central computer over a downhole communication network and a surface communication network. Both the downhole and the surface communication networks are wireles... | 08/21/2007 |
