Geometrical instruments – Area integrators – Electrical
Patent
1983-02-24
1986-07-01
Strecker, Gerard R.
Geometrical instruments
Area integrators
Electrical
33127, 324206, 324263, G01B 726, G01B 704
Patent
active
045971838
ABSTRACT:
Methods and apparatus are disclosed for measuring a length of logging cable introduced into a borehole, thereby measuring the depth of a logging tool, or sonde, attached to the lower end of the cable. The methods involve producing an electrical signal, which propagates along the cable, and detecting at the mouth of the borehole the time of passage of the initial electrical signal and the time of passage of a subsequent electrical signal reflected or returned upwardly from the lower end of the cable, or, alternatively, the time of arrival of the reflected or returned electrical signal at the upper end of the cable. These times can be determined by means of clocks which are switched on by the passage of the initial electrical signal and switched off by the subsequent electrical signal. Knowing the time intervals and the velocity of propagation of electrical signals in the cable, the length of cable from the mouth of the borehole to the lower end of the cable, and thus the depth of the sonde, is measured. Various embodiments of apparatus including electrical signal detectors which do not electrically contact the cable are disclosed for sensing the electrical signals necessary for measuring the length of cable introduced into the borehole, and thus the depth of the sonde.
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Edmonds Warren S.
Standard Oil Company (Indiana)
Stanley Timothy D.
Strecker Gerard R.
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