Percussion method and apparatus for the investigation of a casin

Details Percussion method and apparatus for the investigation of a casin Percussion method and apparatus for the investigation of a casin

1979-09-19

1981-09-15

Myracle, Jerry W.

Measuring and testing

Borehole or drilling

Downhole test

73 12, 73588, E21B 4700

Patent

active

042890233

ABSTRACT:
A percussion technique is described with which an impulse is applied to an element to bounce it off the inner surface of a casing cemented in a borehole. The movement of the element is automatically measured to produce information from which the bond between the casing and cement behind the point of impact of the element can be evaluated. In accordance with one embodiment, the cement bond evaluation is automatically derived by comparing impact and rebound velocities of the element such as by generating a coefficient of restitution of the bouncing element. In another embodiment, the contact time of the element with the casing is measured to derive an indication of the quality of the cement bond.

REFERENCES:
patent: 2412240 (1946-12-01), Williams et al.
patent: 2641927 (1953-06-01), Grable et al.
patent: 2672050 (1954-03-01), Sewell
patent: 3759085 (1973-09-01), Wilson et al.
patent: 3879982 (1975-04-01), Schmidt

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