Abstract: This invention relates to a nano-robots system and methods for well logging and borewell measurements. In one embodiment, a nano-robot includes a propulsion system for providing thrust in drilling mud, with extendable fins to help steer nano-robot in the drilling mud. The fins are also extendable to a further position then when used for steering, so that the nano-robot may embed itself into a formation to measure its properties, such as porosity and permeability. In an embodiment, a nano-robot includes electrodes to generate a voltage from the ions in the drilling mud, and a transceiver and antenna to provide communication with other nano-robots, and with a transponder on a drilling string so that measured data may be transmitted to surface receivers for data storage and analysis. Other embodiments are described and claimed.