Method for cement evaluation using acoustical logs

Details Method for cement evaluation using acoustical logs Method for cement evaluation using acoustical logs

1990-10-18

1991-07-30

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

181105, G01V 140

Patent

active

050364960

ABSTRACT:
An improved method to determine the quality of a material disposed in an annular space behind a casing (or a liner) in a wellbore. A transit time of a sound wave to travel through a specimen of the material is determined, and a pulse velocity is calculated. The slurry density and mixing rate of the material are determined at a wellsite, and the slurry volume can then be calculated by multiplying the amount of time that the slurry remains at the slurry density by the mixing rate. The slurry has a theoretical acoustical impedance that is equal to the slurry density multiplied by the pulse velocity. The true annular displacement volume and a theoretical acoustical impedance map, an attenuation rate map, and a voltage map are than drawn. After running an acoustical log, a calculated acoustical impedance is derived, and is compared to the theoretical acoustical impedance to detertmine the quality of the material.

REFERENCES:
patent: 3401773 (1986-09-01), Synnott, III
patent: 4703427 (1987-10-01), Catala et al.
patent: 4757479 (1988-07-01), Masson et al.
patent: 4893285 (1990-01-01), Masson et al.
patent: 4896303 (1990-01-01), Leslie et al.
patent: 4928269 (1990-05-01), Kimball et al.

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