Oil and gas are the two natural elements in our earth—crude oil and natural gas—that get extracted through drilling and other methods to be used for heating and fueling purposes. Gas and oil are generally divided into conventional and unconventional categories.
Oil and gas formations that result from a fairly straightforward drilling and extracting process are called conventional oil and gas. In these drilling processes, companies can use standard methods to remove fuel from oil and gas resources. Due to the standardization of the process, costs can be kept low in conventional work.
In the unconventional oil and gas category, it's much more difficult to extract oil and gas, due to unusual circumstances. For example, some resources might be trapped in reservoirs, and it might be difficult for drilling teams to get the oil or gas out of the position. In these cases, unconventional methods must be employed, hence the name. Companies may use hydraulic drilling or gravity drainage to assist in the drilling. Using these extra resources will add costs to an unconventional oil and gas project.