Controlling an underground object

Details Controlling an underground object Controlling an underground object

2007-05-01

2007-05-01

Wong, Albert K. (Department: 2612)

Communications: electrical

Wellbore telemetering or control

Selective control of subsurface equipment

C324S326000, C175S045000, C175S057000, C073S152030

Reexamination Certificate

active

11232908

ABSTRACT:
In order to control the sonde of an underground object, such as an underground boring tool, a predetermined sequence of rotation steps is applied to the object and that sequence is detected. The detection of the appropriate sequence causes the sonde to change its function, for example by changing the carrier frequency of the signal transmitted by the sonde on to change the data output sequence or transfer rate, or to change output power. While it is possible to use a single rotation step, the use of more than one step, with each step to be carried out within a predetermined time, reduces the risk of error.

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