G - Physics – 01 – B
Patent
G - Physics
01
B
354/25, 33/49
G01B 9/02 (2006.01) G01B 11/04 (2006.01) G01B 11/16 (2006.01)
Patent
CA 1286497
ABSTRACT OF THE DISCLOSURE A method and means for determining the amount of stretch in a well logging cable is disclosed. An optical fiber is run into a well with a logging cable and looped back to the surface. A second optical fiber of nominal length is maintained on the surface. A source of mono- chromatic light is passed through both fibers and recombined. As the well logging tool is raised and lowered in the wellbore, the number of interference fringes passing a fixed point is determined. The change in length of the optical fiber and, therefore, the cable will be equal to 1/2 the number of interference fringes passing a fixed point times the wavelength of light used. A precise determination of vertical location can then be made when this information is combined with information from a surface mounted odometer or encoder. This infor- mation further allows a precise determination of interval bulk density or other formation parameters in which it is important to know the depth of a tool.
537903
Angehrn Jorg A.
Graebner Peter
Sie Swan A.
Angehrn Jorg A.
Chevron Research And Technology Company
Graebner Peter
Sie Swan A.
Smart & Biggar
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