Axial-flow underwater three-stage separation method and control system thereof

Abstract

The invention provides an axial-flow underwater three-stage separation method and a control system thereof which are used for underwater direct separation of undersea oil well produced fluids. According to the axial-flow three-stage oil-water separation technique and control system thereof, a crude oil and production sewage treatment facility in the underwater separation system is transferred to the underwater system from the offshore platform, thereby simplifying the oil-gas gathering and transportation process and the production sewage treatment process, lowering the operation energy consumption in the process, and finally implementing oil-water high-efficiency separation. The primary oil-gas-water separation treatment separates out most water in the oil gas, the secondary axial-flow quick separation treatment removes most oil phases in the primary production sewage, and the tertiary axial-flow deep separation treatment removes the residual oil phase in the secondary production sewage. The underwater transfer system is used for pressurizing the oil fluids in all stages by the underwater transfer pump and directly transferring the oil fluids out; and the separation control system automatically controls the underwater separation operations in all stages and regulates the flow rates of the oil well produced fluid and live crude, and ensures the transient flow pressures of the pressurized oil fluids in all stages to be consistent all the time.

Description

technical field [0001] The invention relates to a method for direct underwater separation of oil well production fluid in an underwater production system, in particular to an underwater axial flow three-stage separation control system and its process flow and separation method. Background technique [0002] At present, oil and gas gathering and transportation in offshore oilfields at home and abroad usually adopt "high-pressure well flow→standpipe→platform manifold→three-phase separator→secondary heater→secondary separator→electric booster pump→electric heater→ Typical process flow of electric dehydrator→export pump→sea pipeline”. The high-pressure well flow passes through the three-phase separator and the gravity sedimentation of the chemical agents and water particles in the secondary separator to realize the three-phase separation of oil, gas and water, and then uses the high-voltage electric field of the electric dehydrator to demulsify the crude oil for further dehydrat...

AI Technical Summary

Problems solved by technology

In addition, the research on the direct separation method of oil well production fluid in underwater production system is still in its infancy and experimental stage at home and abroad.

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