petrl̤eo petroleum 6 reservoirs 6 reservorios 6 Combustibles 5 Combustibles fs̤iles 5 Fossil fuels 5 lisää ... Fuels 5 gas natural 5 natural gas 5 oil 5 energa̕ 4 energy 4 energy sources 4 fuentes de energa̕ 4 refinacin̤ 3 wellheads 3 gas hydrates 2 hidratos de gas 2 industria del petrl̤eo 2 industria petroqum̕ica 2 monetizacin̤ de gas natural 2 natural gas monetization 2 oil industry 2 operaciones 2 operations 2 petrochemical industry 2 procesos 2 processes 2 refining 2 vähemmän ...