Method and apparatus for providing repeatable wireline depth mea

Details Method and apparatus for providing repeatable wireline depth mea Method and apparatus for providing repeatable wireline depth mea

1976-07-16

1978-10-03

Haroian, Harry N.

Geometrical instruments

Area integrators

Electrical

G01B 312, G01B 504

Patent

active

041176006

ABSTRACT:
A depth measurement system particularly suitable for automatically driving a recorder under varying wireline measurement conditions for repeatedly depth recording measurements from borehole tools produces different measurements at generally the same point on the wireline which would correspond if measurement conditions were ideal, but are subject to non-repeatable variations. Accordingly, these signals are automatically utilized to provide a repeatable signal. In one form, the signals correspond to magnetic marks and to incremental movement of the wireline, the latter produced by mechanically coupled devices subject to slippage, variations in circumference, etc. The incremental signals are counted and compared with the number expected for such intervals, a low count indicating slippage or the like and used to provide an appropriate alarm and/or an automatically slippage corrected signal particularly suitable for driving a recorder. Also described are method and apparatus for driving a recorder having a maximum safe speed for changing depths which is somewhat slower than permissible for wireline movement. Accordingly, the recorder drive is controlled to allow the recorder depths to lag temporarily behind the wireline movement without losing recorder depth to borehole depth correspondence. A pulse series correction is also described for providing N pulses per 10.sup.n where N corresponds to the non-zero, least significant digits of a correction factor close to unity but requiring at least n digits to express.

REFERENCES:
patent: 2782515 (1957-02-01), Mayes
patent: 3490150 (1970-01-01), Whitfill
patent: 3497958 (1970-03-01), Gollwitzer
patent: 3566478 (1971-03-01), Hurlston
patent: 3753294 (1973-08-01), Attaci et al.

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