Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1987-03-26
1988-10-25
Haroian, Harry N.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
G01C 906
Patent
active
047793538
ABSTRACT:
A tool is provided for measuring the angles of inclination and rotation of the tool itself, especially for use in a borehole. The tool preferably comprises an electrically nonconductive cylindrical chamber containing a conductive fluid and a nonconductive fluid which together fill the chamber; at least two wires oriented parallel to the longitudinal axis of the chamber and located about the circumference of the chamber at other than 180 degrees apart from each other, such that the surface interface between the conductive and nonconductive fluids may be defined by a point along each of the two wires along with a third point on the surface; and electrical means attached to the wires for sensing an electrical characteristic of the wires corresponding to the points along the wires defined by the fluid interface; and means for using the sensed electrical characteristics of the wires, a knowledge of the chamber radius, and a knowledge of the third point, and determining therefrom an index of inclination of said chamber. Preferably, the means for using the sensed electrical characteristics to determine an index of inclination also uses the sensed electrical characteristics of the wire and a knowledge of the third point to provide an index of rotation of the chamber. The electrical characteristics are typically resistance values which can be determined by injecting current into the wires and determining a resulting voltage.
REFERENCES:
patent: 1859222 (1932-05-01), Rogers
patent: 2440189 (1948-04-01), Zworykin
patent: 3290786 (1966-12-01), Parkin
patent: 3478437 (1969-11-01), Cothran
patent: 4028815 (1977-06-01), Buckley et al.
patent: 4583296 (1986-04-01), Dell'Acqua
Couet Benoit
Lopes Jose C. B.
Stumolo Gary S.
Ziehl Warren F.
Gordon David P.
Haroian Harry N.
Schlumberger Technology Corporation
Smith Keith G. W.
Tager Clifford L.
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