change from oil to gas

convert oil to gas

gas-to-oil mobility ratio

gas-to-oil ratio

oil-gas gas exploration

gas-to-gas heat exchanger

3 phase of oil-gas-water

acidy oil-gas field

air-to-oil cooler

ammonia revamping project of using natural gas to replace residual oil

associated gasoil ratio

atmospheric gas oil

atmospheric gasoil ratio

axial gas-oil multiphase pump

basement oil-gas reservoir

basin reformation and oil-gas preservation

buried hill oil-gas reservoir

catalyst to oil

catalyst to oil ratio