The oil and gas industry is usually divided into three major sectors: upstream (exploration and production – E&P), midstream, and downstream. Upstream usually explores for, finds, and produces oil and natural gas. Upstream has traditionally experienced the highest number of mergers, acquisitions, and divestitures.
Midstream is a major phase of oil and gas industry operations which involves the transportation, storage, and wholesale marketing of the products. Pipelines are used to move the products form production sites to refineries and deliver them to downstream distributors.
Oilfield services companies provide the equipment and services used in the exploration for and extraction of oil and natural gas. These services include: Construction or deconstruction of a well, general maintenance and upkeep, pressure pumping/fracing, water-hauling, repair maintenance, and inspections.
Alternative and renewable energy is generally defined as energy that is collected from resources which are naturally replenished on a human timeline. Forms of this include: solar energy, wind power, geothermal energy, biofuel, and hydro power.