| Patent Number |
Title Of Patent |
Date Issued |
| 8061206 |
Casing thickness evaluation method |
November 22, 2011 |
| Evaluating casing thickness by inducing SH0 and SH1 modes of a shear wave in the casing. The SH0 group velocity and SH1 mode group velocity (Vg) are measured and the measured SH0 mode group velocity is assigned as the tubular material shear velocity (Vs). A shear wave wavelength .lamda. |
| 7911877 |
Active noise cancellation through the use of magnetic coupling |
March 22, 2011 |
| 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. |
| 7787327 |
Cement bond analysis |
August 31, 2010 |
| A method and apparatus for evaluating a bond between a formation and a bonding material. The method includes emitting a shear wave into the tubular, recording the response of the shear wave, and evaluating the response to obtain bond information. The bond information includes bond ma |
| 7773454 |
Method and apparatus for cement evaluation using multiple acoustic wave types |
August 10, 2010 |
| 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 wellbore. The transversely |
| 7681450 |
Casing resonant radial flexural modes in cement bond evaluation |
March 23, 2010 |
| A method useful for evaluating the presence and/or the quality of the cement bond of a downhole tubular. The method involves measuring radial resonance modes of the tubular, and comparing those measured values to the unbound tubular resonant values of a calibration ring. For a well b |
| 7663969 |
Use of Lamb waves in cement bond logging |
February 16, 2010 |
| 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 through the cement bond |
| 7639562 |
Active noise cancellation through the use of magnetic coupling |
December 29, 2009 |
| 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 output of an electrom |
| 7525872 |
Method and apparatus for cement bond evaluation using transversely polarized shear waves |
April 28, 2009 |
| 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 wellbore. The transversely |
| 7150317 |
Use of electromagnetic acoustic transducers in downhole cement evaluation |
December 19, 2006 |
| 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 comprised of an electromag |
