Electrical Components

Nanorobots are already in use in medicine for detection of diseases and delivering medicines within the human body.

The use of nanorobots for oil exploration data collection should also be possible.

Nanorobots' use in medicine is a feat praiseworthy.

but its use in thousands of feet below the sole under immense geothermal heat and pressure, in my view is still years away. we'll get there though. we got here.

Not so true if you look at the work been carried out on carbon nano tubes and substrates like graphene you will see that they could easily work in heated enviorments, unlike silicon based devices. As the data info being collected wouldnt require massive intergration (ie measuring temp could be done with a handful of transistor and a small transmitter about the same and power from the very heat you talk about) I think it very possible even with convention silicon it maybe a vaible option..