Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1990-10-30
1992-02-18
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 25, 367911, 181102, 181105, G01N 904, G01V 140
Patent
active
050899899
ABSTRACT:
A new "radial" cement bond instrument is disclosed for measuring the quality of cement to casing bond. The instrument is capable of measuring the quality of the cement bond both vertically and circumferentially. Four arrays of sectored transmitters and receivers are arranged longitudinally along the instrument body and provide a compensated radial bond measurement with high azimuthal resolution. The sectored transmitter excites both a compressional wave and a shear wave in the casing, with the beam pattern of the transmitter focused in a radial direction. The sectored receiver provides additional directivity for enhanced detection of channels in cement. The disclosed apparatus provides measurement of the quality of cement bond in eight radial segments. The resolution of the instrument provides 5 to 10 percent overlap to insure "full" coverage of the borehole. In its normal operational mode, amplitude information is recorded from the sectored receivers, an acoustic signature from a five-ft spaced transmitter-receiver is recorded, and a two-axis orientation measurement is acquired. The system also has the flexibility to acquire and record acoustic signatures from the segmented receivers.
REFERENCES:
patent: 3697937 (1972-10-01), Ingram
patent: 3747702 (1973-07-01), Beil
patent: 4703427 (1987-10-01), Catala et al.
patent: 4757479 (1988-07-01), Masson et al.
patent: 4809237 (1989-02-01), Vogel et al.
patent: 4896303 (1990-01-01), Leslie et al.
Schmidt, M. G.; "The Micro CBL"; 30th Annu SPWLA Logging Symp; Denver, 6/14/89; Trans VI, Pap No. 2, 16 pp; Abst.
Albert et al.; "A Comparison of CBL, RBT and PET Logs . . . "; 62nd Annu. SPB Tech Conf.; Dallas, 9/30/87, pp. 681-689; Abst.
Leigh et al.; "Results of Field Testing . . . Tool"; 25th Annu. SPWLA Logging Symp., 6/13/84, Trans VI, 21 pp.; Abst.
Catala et al.; "A Combination of Acoustic . . . Cementations"; 59th Annu. SPB of AIME Tech Conf. 9/19/84, SPB 13139, 8 pp.; Abst.
Masak Peter C.
Rhodes Paul B.
Schmidt Mathew G.
Moskowitz Nelson
Springs Darryl M.
Western Atlas International Inc.
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