Oil-gas-water separation device and method for oil-gas field produced liquid

An oil-gas-water separation device for an oil-gas field produced fluid, comprising:

• a primary separation mechanism for a gas-liquid separation of the oil-gas field produced fluid, comprising a liquid inlet pipe, and a gas-liquid separation unit in communication with the liquid inlet pipe;
• a main container, in which a secondary separation zone and a tertiary separation zone are formed, the liquid inlet pipe being in fluid communication with the secondary separation zone;
• a secondary separation mechanism arranged in the secondary separation zone, for performing a primary oil-water separation on an oil-water mixture separated by the primary separation mechanism and entering the secondary separation zone;
• and
• a tertiary separation mechanism arranged in the tertiary separation zone, comprising a three-dimensional electrode unit capable of generating an electric field to destabilize an oily produced water separated by the secondary separation mechanism, so as to perform a secondary oil-water separation on the oily produced water,
• wherein the main container further comprises a collection zone for collecting the separated oil and water.