Oil & Gas
The upstream sector includes the searching of potential underground (onshore) or underwater (offshore) crude oil & NG fields, drilling of explanatory wells& subsequently drilling & operating the wells that bring crude Oil & NG to surface. Coal bed methane extraction is also a part of upstream activity. Some examples can be fixed offshore platforms, FPSO, Drilling Rigs Etc.
Transportation (Pipelines), storage, (track forms) and marketing of Petroleum products. Many a times midstream operations are considered as a part of downstream.
Refining of petroleum crude and processing & purifying of raw natural gas is called as Downstream Process. The Downstream operations will cover all positions with refineries & petro chemical processes.