E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 47/024 (2006.01) E21B 47/022 (2006.01) G01C 9/14 (2006.01)
Patent
CA 2050768
ABSTRACT An inclinometer comprising a tubular casing (1), a sleeve (22) formed internally with steps (54) of progressively increasing diameter and a venturi ring (52) spring-urged to move axially within the casing between end portions, a central rod (42) presenting a series of co-axial rings (44) with any one of which the venturi ring on the sleeve is selectively co- operative according to the position of the sleeve to provide a restriction projecting into the sleeve, and a pendulum (46) universally pivotally attached to the rod (42) and formed with an annular radially projecting latching shoulder (50) engageable with a particular one of the steps on the sleeve according to the position of the sleeve. As sleeve moves under mud pressure pendulum moving from vertical engages a particular step and stops movement of the ring under mud pressure. Counting of number of pressure pulses as venturi ring moves along rod gives position of step engaged by pendulum and inclination angle of inclinometer.
Anderson Charles A.
Fetherstonhaugh & Co.
LandOfFree
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