Method and apparatus for acoustic logging of fluid density and w

Details Method and apparatus for acoustic logging of fluid density and w Method and apparatus for acoustic logging of fluid density and w

1998-08-28

2000-04-18

Oda, Christine K.

Measuring and testing

Borehole or drilling

Downhole test

73 32, 181 5, G01T 116

Patent

active

060501413

ABSTRACT:
A method of determining the acoustic impedance of a fluid in a borehole, by gating a reflected acoustic signal into a plurality of time slots, and comparing received energies of the signal for the time slots to obtain a value indicative of the acoustic impedance of the fluid. The value may be normalized to yield the acoustic impedance of the fluid using the acoustic impedance of, e.g., water as a calibration point. The comparison is performed by comparing a ratio of an integration of a first ring down time slot and a second ring down time slot, to an integration of an internal reflection time slot. The acoustic pulse may be generated using a transducer immersed in an intermediate fluid contained within a chamber defined in part by a plate in contact with the borehole fluid and having a thickness such that a mechanical resonance frequency of the plate in a thickness mode is substantially equal to a resonance frequency of the transducer. The sonic velocity of the fluid is also measured and, when combined with the acoustic impedance, is used to determine the fluid density.

REFERENCES:
patent: 3732947 (1973-05-01), Moran et al.
patent: 4255798 (1981-03-01), Havira
patent: 4571693 (1986-02-01), Birchak et al.
patent: 4939362 (1990-07-01), Supernaw et al.
patent: 5036916 (1991-08-01), Bennett
patent: 5204529 (1993-04-01), Diatshcenko

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