Continuous gravity gradient logging

Details Continuous gravity gradient logging Continuous gravity gradient logging

1984-10-04

1986-07-29

Myracle, Jerry W.

Measuring and testing

Gravitational determination

G01V 700

Patent

active

046025081

ABSTRACT:
A continuous gravimetry survey is carried out with a gravity logging tool having a column of fluid within the tool. First and second pressure sensors are located at spaced-apart axial positions within an upper portion of the fluid column. Third and fourth pressure sensors are located at spaced-apart axial positions within a lower portion of the fluid column. The outputs from the first and second pressure sensors are differenced to produce a first pressure difference signal. The outputs of the third and fourth pressure sensors are also differenced to produce a second pressure difference signal. The difference between these first and second pressure difference signals is related to the gravity gradient along the earth formation adjacent the fluid column. Such a gravity gradient is a continuously moving gradient that is insensitive to acceleration effects from unsteady motions of the logging tool as it traverses the earth formation during the gravimetry survey.

REFERENCES:
patent: 4399693 (1983-08-01), Gournay
patent: 4419891 (1983-12-01), Browning
patent: 4475386 (1984-10-01), Fitch et al.
The Art of Electronics, P. Horowitz et al., Cambridge University Press, pp. 621-623.

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