👉 The term "wellhead" is a geological term that refers to the point at which a well or other drilling equipment enters the water-bearing rock below it. It's typically located in a deep borehole, where the well itself is being drilled into a layer of rock that provides pressure and strength for the drill pipe. The wellhead is the first stage of a well, and its location determines how many layers of drilling can be completed without needing to break through the rock below.