Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1986-06-27
1988-02-02
Willis, Davis L.
Optics: measuring and testing
By particle light scattering
With photocell detection
356358, G01B 902
Patent
active
047226030
ABSTRACT:
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 monochromatic 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 information 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.
REFERENCES:
patent: 4162400 (1979-07-01), Pitts, Jr.
patent: 4597183 (1986-07-01), Broding
patent: 4625547 (1986-12-01), Lyle, Jr.
patent: 4656421 (1987-04-01), Ellis et al.
patent: 4671659 (1987-06-01), Rempt et al.
Angehrn Jorg A.
Graebner Peter
Sie Swan A.
Chevron Research Company
Keeling E. J.
Koren Matthew W.
LaPaglia S. R.
Norviel V. A.
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