Borehole orientation detection system employing polarized radiat

Details Borehole orientation detection system employing polarized radiat Borehole orientation detection system employing polarized radiat

1982-08-09

1984-03-06

Birmiel, Howard A.

Measuring and testing

Borehole or drilling

Downhole test

340854, 175 45, 166255, 33304, E21B 47022

Patent

active

044346549

ABSTRACT:
A borehole survey instrument has a probe with a polarized light system for transmitting a signal representing the angular orientation of the probe to the surface. Light from a source in the probe is directed through a polarizing filter with an axis of polarization orthogonal to the longitudinal axis of the probe. The polarized light beam is transmitted to the surface through an optical fiber light conduit. The angle of polarization is detected with a rotating polarizing filter and provides a measure of the probe orientation. In surveying a borehole, azimuth is determined from inclinometer measurements. The probe orientation in vertical sections of the borehole is measured by the polarized light system. Two measures of borehole azimuth are combined, providing an improved measure of azimuth in boreholes near vertical and near horizontal.

REFERENCES:
patent: 3741013 (1973-06-01), Hering et al.
patent: 3905010 (1975-09-01), Fitzpatrick
patent: 3993127 (1976-11-01), Chepelev et al.
patent: 4162400 (1979-07-01), Pitts, Jr.
patent: 4189705 (1980-02-01), Pitts, Jr.
patent: 4190962 (1980-03-01), Lyman, Jr.
patent: 4231252 (1980-11-01), Cherkson
patent: 4389645 (1983-06-01), Wharton

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