Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1988-03-15
1989-08-29
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
356345, 356358, G01V 140, G01B 902
Patent
active
048624241
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: 4328567 (1982-05-01), Dodge
patent: 4373804 (1983-02-01), Pryor et al.
patent: 4375164 (1983-03-01), Dodge et al.
patent: 4450540 (1984-05-01), Mallett
patent: 4555175 (1985-11-01), Gardner et al.
patent: 4570248 (1986-02-01), Assard
patent: 4597183 (1986-07-01), Broding
patent: 4612536 (1986-09-01), Harman
patent: 4625547 (1986-12-01), Lyle, Jr.
patent: 4656421 (1987-04-01), Ellis et al.
patent: 4671659 (1987-06-01), Rempt et al.
patent: 4722603 (1988-02-01), Graebner et al.
Ayre, R. W. A., "Measurement of Longitudinal Strain in Optical Fiber Cables During Installation. . . " IEEE 1986.
Carroll, J. W., et al., "A Fiber Optic Hydrophone with a Mechanical Anti-Aliasing Filter," IEE 1986.
Angehrn Jorg A.
Graebner Peter
Sie Swan A.
Chevron Research Company
Keeling E. J.
LaPaglia S. R.
Lobo Ian J.
Tarcza Thomas H.
LandOfFree
Interferometric means and method for accurate determination of f does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Interferometric means and method for accurate determination of f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interferometric means and method for accurate determination of f will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2245517