Petroleum reservoir engineering 12 TJ Mechanical engineering and machinery 12 TP Chemical technology 11 Petroleum reservoirs 8 Crude oil 5 Floods 4 Reservoirs (water) 4 T Technology (General) 4 Additives 3 Biodiesel 3 Carbon dioxide 3 Enhanced recovery 3 Environmental science, engineering & technology 3 Fermentation 3 Flow of fluids 3 Gas industry 3 Gases 3 Gasoline 3 Heat transfer 3 Heavy oil production 3 Low permeability reservoirs 3 Natural gas wells 3 Oil well flooding 3 Petroleum industry 3 Petroleum technology 3 Porosity 3 TK Electrical engineering. Electronics Nuclear engineering 3 biofuel 3 fermentation 3 metabolism 3