Rotating acoustic transducer head for cement bond evaluation too

Details Rotating acoustic transducer head for cement bond evaluation too Rotating acoustic transducer head for cement bond evaluation too

1997-06-05

1998-11-24

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 86, 367911, 367912, 181104, 181105, 7315217, 175 50, G01V 100

Patent

active

058417346

ABSTRACT:
An apparatus for logging a borehole comprises a non-rotating component and a rotating component that is flexibly attached to the non-rotating component and includes a logging head. The rotating component is centralized independently from the non-rotating component such that the rotating component remains centralized as it rotates, regardless of whether the non-rotating component is centralized. The logging head includes at least one signaling device, a hydrostatic pressure balancing system, a sealed, variable-volume fluid reservoir in fluid communication with said transducer, and a motor housed in said logging head for rotating the rotating component. The apparatus can further include a second non-rotating component suspended below the rotating component.

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SPE Drilling & Completion; Jun. 1995; Standoff and Caliper Measurements While Drilling Using a New Formation-Evaluation Tool with Three Ultrasonic Transducers; Moake, Birchak, Matthews, Schultz; (pp. 104-111).
Halliburton Energy Services; CAST Borehole Imaging; 1995.

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