Method and apparatus for determining direction parameters of a c

Details Method and apparatus for determining direction parameters of a c Method and apparatus for determining direction parameters of a c

1980-09-22

1982-12-07

Myracle, Jerry W.

Measuring and testing

Borehole or drilling

Downhole test

E21B 4700

Patent

active

043620540

ABSTRACT:
Method and apparatus for continuously determining direction parameters of a borehole from the position of a well logging tool in the borehole during tool movement in the borehole, comprise a well logging tool including an accelerometer and a direction indicator, such as a magnetometer, with three sensitive axes respectively. Output signals derived from the accelerometer are prefiltered and then combined with respective output signals derived from the direction indicator in a manner so as to reduce to negligible proportions the effects of tool motion on respective ones of the output signals. The resulting signal is then subjected to a selective low-pass filtering, and the components thereof are thereafter, respectively combined with corresponding, suitable components of the original output signals in a manner such as to derive direction parameters for the borehole.

REFERENCES:
patent: 3862499 (1975-01-01), Isham et al.
patent: 3899834 (1975-08-01), Harrison, Jr.
patent: 3935642 (1976-02-01), Russell
patent: 4016766 (1977-04-01), Morris
patent: 4227405 (1980-10-01), West

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