Combined degassing and floatation tank
AssigneeEPCON Norge AS
InventorStein Egil Oserod
Life of this patent
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Abstract
A combined degassing and flotation tank for separation of a water influent containing considerable amounts of oil and gas. A rotational flow is created in the tank which forces the lighter components such as oil and gas droplets towards an inner concentric cylindrical wall where they coalesce and rise to the surface of the liquid and are removed via the outlet. The heavier parts are forced down where the heavy particles sink to the lower part where they can be removed as a sludge. The water is discharged via an outlet in the lower part of the tank. The combined degassing and flotation tank is particular suited for use in oil production at sea for removal of oil and gases from water streams before the water is returned to the sea.
Claims22
A combined degassing and flotation tank comprising an essentially cylindrical vertical tank having a top and a bottom, a tangentially arranged inlet, an outlet for gas and oil placed in an upper part of the tank, an outlet for water placed essentially in a center of the bottom, and at least one essentially concentrically arranged vertical first baffle extending from the top of the tank leaving a passage for water in a lower part of the tank and a passage for gas in the upper part of the tank, and at least one essentially concentric, cylindrical vertical baffle of smaller diameter than said first baffle extending from the bottom of the tank leaving a passage in the upper part of the tank, and wherein the tank further comprises an inlet guide vane placed in connection with the inlet leaving an open space between the inlet guide vane and the first baffle.
A combined degassing and flotation tank comprising an essentially cylindrical vertical tank having a top and a bottom, a tangentially arranged inlet, an outlet for gas and oil placed in an upper part of the tank, an outlet for water placed essentially in a center of the bottom, and at least one essentially concentrically arranged vertical first baffle extending from the top of the tank leaving a passage for water in a lower part of the tank and a passage for gas in the upper part of the tank, and at least one essentially concentric, cylindrical vertical baffle of smaller essentially concentric, cylindrical vertical baffle of smaller diameter than said first baffle extending from the bottom of the tank leaving a passage in the upper part of the tank.
A combined degassing and flotation tank comprising an essentially cylindrical vertical tank having a top and a bottom, a tangentially arranged inlet, an outlet for gas and oil placed in an upper part of the tank, an outlet for water placed essentially in a center of the bottom, and at least one essentially concentrically arranged vertical first baffle extending from the top of the tank leaving a passage for water in a lower part of the tank and a passage for gas in the upper part of the tank, and at least one essentially concentric, cylindrical vertical baffle of smaller diameter than said first baffle extending from the bottom of the tank leaving a passage in the upper part of the tank, wherein the tank is configured for use in an oil production from an aged oil field at sea in an environmentally fragile area.
Dependencies are inferred from the claim text.