Method of qualifying a borehole survey

Details Method of qualifying a borehole survey Method of qualifying a borehole survey

1996-11-21

1998-08-04

Tsay, Frank

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

175 50, E21B 47022, E21B 47024

Patent

active

057879974

ABSTRACT:
A method of qualifying a survey of a borehole formed in an earth formation is provided. The method includes the steps of a) selecting a sensor for measuring an earth field parameter and a borehole position parameter in said borehole, b) determining theoretical measurement uncertainties of said parameters when measured with the sensor, c) operating said sensor so as to measure the position parameter and the earth field parameter at a selected position in the borehole, d) determining the difference between the measured earth field parameter and a known magnitude of said earth field parameter at said position, and determining the ratio of said difference and the theoretical measurement uncertainty of the earth field parameter, and e) determining the uncertainty of the measured position parameter from the product of said ratio and the theoretical measurement uncertainty of the position parameter.

REFERENCES:
patent: 4682421 (1987-07-01), van Dongen et al.
patent: 4710708 (1987-12-01), Rorden et al.
patent: 4761889 (1988-08-01), Cobern et al.
patent: 4957172 (1990-09-01), Patton et al.
patent: 5103920 (1992-04-01), Patton
patent: 5155916 (1992-10-01), Engebretson
patent: 5452518 (1995-09-01), DiPersio

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