| 摘要 |
<p>A borehole survey method and apparatus, the apparatus including (a) angular rate sensor means (16) having a sensitive axis, (b) tilt sensor means (17, 18), (c) a rotary drive (13) operatively connected to said (a) and (b) sensor means to rotate same about an axis extending generally in the direction of the borehole. (d) and circuitry operatively connected with said (a) and (b) sensor means to determine the azimuthal direction of tilt of the borehole at a first location therein, said (a) sensor means also connected in feedback relation with the drive whereby the sensitive axis of the (a) sensor means is maintained at a predetermined orientation relative to horizontal during travel of said apparatus in the borehole relative to said first location, and whereby changes in borehole alignment during said travel may be determined.</p> |
