Drill hole survey instrument

Details Drill hole survey instrument Drill hole survey instrument

E - Fixed Constructions

21

B

33/92

E21B 47/02 (2006.01) E21B 47/022 (2006.01)

Patent

CA 1137299

-la- ABSTRACT OF INVENTION. A drill hole survey instrument comprising a first pair of inclinometers with sensitive axes that are co-planar and at 90° to each other, mounted at one end of a torsionally rigid member of known length and a second pair of inclino- meters similarly mounted at the other end of the rigid member so that when the instrument is vertical the sensitive axes lie in two vertical planes at 90° to each other.

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