An oil or gas well is created by drilling a hole into the earth with a drilling rig which contains all necessary equipment and generates the required onsite power for all operations. The drilling rig rotates a drill string with a drill bit attached. The drill bit, aided by the weight of thick walled pipes („drill string“), cuts into the formation. Drilling fluid (“mud”) - a complex, carefully tailored mixture of fluids, solids and chemicals - is pumped down the inside of the drill pipe and exits at the drill bit in order to cool and clean it. As the drilling fluid circulates back to surface outside the drill pipe, it sweeps up the generated rock “cuttings” and helps preventing destabilization of the rock in the wellbore walls.