Advances in drilling technology, such as lateral wells, have reduced the footprint of the oil industry and increased the recovery of oil.

Prudhoe Bay Well Layout
Here’s a typical well pad layout from the 1970s and 1980s. This is a section of Prudhoe Bay. The red areas are the well pads and the black lines represent the horizontal component of the well bores. Kind of looks like a quartet of shotgun blasts. The technology of the day did not allow long sidetracks, so field development took place in a radial pattern. The efficiency of oil recovery from the field is limited by how many pads can be checkerboarded on the surface.

Alpine Well Field Layout
Here’s a similar map of the Alpine field. Alpine was discovered in 1994, and was the first North Slope field to developed exclusively with all horizontal wells, both producers and injectors. Notice that one smaller pad covers the same area of the field that took four larger pads at Prudhoe Bay. The use of laterals means that oil-bearing formations can be more efficiently drilled and produced with a smaller number of wells.
The use of multi-lateral technology has also improved the economics and oil recovery of the West Sak and Schrader Bluff formations. The technology is a cost-effective method to develop remaining oil or oil located in isolated but closely stacked sandstones separated by layers of shale, so more complicated stratigraphic plays can be developed.