Downstream operations are the processes involved in converting oil and gas into the final product. A downstream operation is the final stage of a process where oil and gas are processed and turned into a finished product, or a supply stock.Offshore production is the process of producing oil and gas by using pumps in the ocean floor. This process, however, is not without its manufacturing processes. Offshore production, as well as most other manufacturing processes, require a lot of steps in the process of converting hydrocarbons into the finished product. Here is a look at the key steps in an offshore production process.Typically, upstream operations focus on extracting oil and gas. But downstream operations are the processes that convert oil and gas into the finished product such as gasoline, diesel, and natural gas. Downstream operations are also responsible for producing naphtha, asphalt, and fertilizers from the raw materials.