Crude oil production is defined as the quantities of oil extracted from the ground after the removal of inert matter or impurities. It includes crude oil, natural gas liquids (NGLs) and additives. This indicator is measured in thousand tonne of oil equivalent (toe).Crude oil is a mineral oil consisting of a mixture of hydrocarbons of natural origin, yellow to black in colour, and of variable density and viscosity. Baby oil is a perfumed mineral oil. Most often, mineral oil is a liquid by-product of refining crude oil to make gasoline and other petroleum products. This type of mineral oil is a transparent, colorless oil, composed mainly of alkanes and cycloalkanes, related to petroleum jelly. It has a density of around 0.8 g/cm 3. Oil & Gas Production Phase. After the flurry of activity surrounding drilling, completing, testing and getting the ownership and payment paperwork in order, finally comes what both oil company and mineral owner look forward to – the production phase. Crude oil, natural gas, condensate, (and err…usually some salt water) begin to flow.