Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Reexamination Certificate
2011-02-08
2011-02-08
Hellner, Mark (Department: 3663)
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
C367S069000, C181S105000
Reexamination Certificate
active
07885142
ABSTRACT:
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 mounted on a rotating scanning head that is pointed essentially perpendicular to the borehole wall. The response of the transducer is used to measure an original impedance map of material within the borehole-casing annulus. A fast Fourier transform is used to generate a FFT map from the data comprising the original impedance map. The original impedance map is then combined with the FFT map using logic rules to obtain a final impedance map that is indicative of material within the casing-borehole annulus.
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patent: 2008/0112262 (2008-05-01), Tang et al.
Goodwin, K.J., “Guidelines for Ultrasonic Cement-Sheath Evaluation” SPE Production Engineering, Aug. 1992, pp. 280-284.
Graham, W.L., “Enhanced Statistical Variation Method for Determining Zone Isolation in Complex Cements” SPE-28772, Nov. 1994.
Butsch, R.J., “Overcoming Interpretation Problems of Gas-Contaminated Cement Using Ultrasonic Cement Logs” SPE-30509, Oct. 1995.
Harness, P.E., “Neutron Logs Improve Interpretation of Foamed Cements, Evin in Concentric Casing” SPE-35681, May 1996.
Frish, Gary J., “Assessment of Foamed-Cement Slurries Using Conventional Cement Evaluation Logs and Improved Interpretation Methods” SPE-55649, May 1999.
Molder Sarah D.
Tello Lucio N.
Hellner Mark
Precision Energy Services, Inc.
Wong, Cabello, Lutsch, Rutherford & Brucculeri L.L.P.
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