Position detection

A method of detecting the change in position of an underground object 2 comprises the steps of measuring the displacement of the object in its path of movement, measuring the angle the object makes with the horizontal or vertical, and calculating a change in position of the object from these measure...

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Bibliographic Details
Main Authors RICHARD WILLIAM FLING, CHRISTOPHER JOHN RAINEY
Format Patent
LanguageEnglish
Published 10.01.2001
Edition7
Subjects
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
GYROSCOPIC INSTRUMENTS
MEASURING
MEASURING DISTANCES, LEVELS OR BEARINGS
MINING
NAVIGATION
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
PHOTOGRAMMETRY OR VIDEOGRAMMETRY
PHYSICS
SURVEYING
TESTING
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Summary:A method of detecting the change in position of an underground object 2 comprises the steps of measuring the displacement of the object in its path of movement, measuring the angle the object makes with the horizontal or vertical, and calculating a change in position of the object from these measurements. The angle which the object makes with the horizontal or vertical may be detected by a tilt sensor (figs. 2-5) which uses a ferromagnetic fluid and which signals the tilt of the object to an outstation 8 via a modulated magnetic field. The outstation also determines any deviation in the heading of the object on the basis of the magnetic field generated by the object. The displacement of the object along its path is calculated by counting the number of rods 6 added behind the object, using magnetic sensors (figs. 6-9) to detect the passage of rod joints.
Bibliography:Application Number: GB19960016151