Downstream (oil industry) ... The downstream part is the refining of oil raw petroleum and the handling and decontaminating of crude gaseous petrol, just as the showcasing and dissemination of items got from unrefined petroleum and flammable gas. The terms upstream and downstream oil and gas creation allude to an oil or gas organization's area in the production network. ... Upstream oil and gas generation is directed by organizations who distinguish, concentrate, or produce crude materials. Downstream oil and gas creation organizations are nearer to the end-client or purchaser. Upstream alludes to the material sources of info required for generation, while downstream is the far edge, where items get delivered and circulated. Upstream (oil industry) ... The upstream area incorporates scanning for potential underground or submerged raw petroleum and flammable gas fields, penetrating exploratory wells, and thusly boring and working the wells that recoup and bring the unrefined petroleum or crude gaseous petrol to the surface. The upstream oxygen sensor is arranged before the exhaust system while the downstream oxygen sensor is situated after the exhaust system. The upstream sensor screens the degree of contaminations in the motor's fumes and sends this data to the ECU that persistently alters the air-fuel proportion.