초록 ▼

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

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.

대표청구항 ▼

A borehole survey probe comprising: a housing to traverse the borehole, the housing having a longitudinal axis and being randomly rotatable about said longitudinal axis as the housing traverses the borehole; an inclinometer in said housing; and a source of polarized electromagnetic radiation fixed t

A borehole survey probe comprising: a housing to traverse the borehole, the housing having a longitudinal axis and being randomly rotatable about said longitudinal axis as the housing traverses the borehole; an inclinometer in said housing; and a source of polarized electromagnetic radiation fixed to said housing generating a polarized signal having an axis of polarization orthogonal to the longitudinal axis of the housing, the axis polarization of the signal providing a measure of the orientation of the housing as a reference for said inclinometer.