equipos de fondo vs. equipos superficiales

I was researching the term "equipo de fondo", and found some good information, here:

http://www.iie.org.mx/gee/arti/12.pdf    spanish article talking about "los equipos de fondo" with diagrams.

Basically, it looks like the drilling equipment is divided as such:

Equipos superficiales = Surface equipment   (everything that's above ground)
Equipos de fondo = Downhole equipment   (everything that's below ground)

Approved.