RE:RE:RE:RE:RE:AGM
MWD is for measurement while drilling, it is a tool that sends info such as inclination and azimuth, real time back to surface via a mud or electro magnetic pulse. Depending on the tool used , it will also measure gamma counts, resistivity, porosity and density of the formation as you drill. Very good tool to use, not good to leave in hole! As well it is correlated to any mud motor downhole so the well can be steered, and kept straight to reduce doglegs in the wellbore.