E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
33/92
E21B 47/02 (2006.01) E21B 47/022 (2006.01)
Patent
CA 1166843
ABSTRACT OF THE DISCLOSURE An apparatus and method for surveying a borehole, mine shaft or the like to determine its trajectory. A sensing probe with two spaced sets of accelerometers measures components of the gravity vector along orthogonal axes at successive positions along the borehole. The two sets of accelerometers are joined by a connector such as a pipe or a cable which is flexible to bend but is torsionally stiff. The angular orientation of the two accelerometer sets relative to each other about the borehole axis is fixed by the connector so that any difference in ori- entation of the two sets is a function of the local trajectory of the borehole. Two sets of accelerometer output signals representing gravity vector components at positions spaced apart along the axis of the borehole are utilized to derive the borehole inclina- tion at each position as well as the change in borehole azimuth angle between the positions of the accelerometer sets. The accelerometer signals, together with a signal representing the position of the probe along the length of the borehole, are com- bined to provide a three dimensional representation of the borehole trajectory, relative to a reference point, which may be the termination of the borehole at the surface.
387999
Riches Mckenzie & Herbert Llp
Sundstrand Data Control Inc.
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