Before the drilling rig arrives many rigs need to have some prep work done such as setting a conductor pipe. The conductor pipe is typically a length of 16″ pipe (could be 20″ or 24″) that is cemented in place that serves as a pilot hole, which the drilling rig will use in the first step of its drilling process. This helps reduce time for the rig by sealing off any early loss circulation concerns due to poor soils at surface.
Conductor setting rigs will also set the cellar crib, typically 6′ x 3′, that keeps an area open around the hole and makes it easier for attaching well control equipment. This process can also include the drilling of the mouse hole, which is a storage hole for the kelly and a stand of pipe.