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  2. Total petroleum hydrocarbon - Wikipedia

    en.wikipedia.org/wiki/Total_Petroleum_Hydrocarbon

    Total petroleum hydrocarbons (TPH) is a term used for any mixture of hydrocarbons that are found in crude oil. There are several hundred of these compounds, but not all occur in any one sample.

  3. Nelson complexity index - Wikipedia

    en.wikipedia.org/wiki/Nelson_complexity_index

    5] Where: is a complexity factor; is a unit capacity; is a capacity of crude distillation unit; is a number of all units; The NCI assigns a complexity factor to each major piece of refinery equipment based on its complexity and cost in comparison to crude distillation, which is assigned a complexity factor of 1.0.

  4. Oil well - Wikipedia

    en.wikipedia.org/wiki/Oil_well

    The pumpjack, such as this one located south of Midland, is a common sight in West Texas. An oil well is a drillhole boring in Earth that is designed to bring petroleum oil hydrocarbons to the surface.