G - Physics – 11 – B
Patent
G - Physics
11
B
352/10.1
G11B 15/00 (2006.01) H01B 13/34 (2006.01) H01F 13/00 (2006.01)
Patent
CA 1128655
ABSTRACT OF THE DISCLOSURE Method and apparatus for automatically inscribing magne- tic marks on a moving wireline are disclosed. An alternating magnetic field is generated for application to a zone on the moving wireline. The marks are inscribed on the wireline by interrupting the field in response to a control signal corre- sponding to the time for a mark. The interruption is synchro- nized to alternations of the field and movement of the wireline. The interruption begins between alternations of the field and is maintained for a time sufficient for a predetermined length of the wireline to be moved beyond the application zone. This predetermined length is related to the length of the zone on the wireline affected by the alternating magnetic field, which is applied with a U-shaped electromagnet held in proximity to the wireline. Wireline movement pulses are generated by a tangentially coupled measuring wheel driving an encoder. The movement pulses are counted to determine the time for each mark and provide a control signal corresponding to a desired mark. The pulses are also used to determine when the predeter- mined length of wireline has been moved beyond the application zone and when the interruption of the field ends. Preferably, the field is restored starting with an alternation of a polarity related to the polarity of the field when it was terminated.
289441
Schlumberger Canada Limited
Smart & Biggar
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