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US 6,546,962 B1Granted
Introduction of air into injection water
AssigneeDen Norske Stats Oljeselskap A.S.
InventorEgil Sunde
Life of this patent
Estimating the term…
Abstract
Air is introduced into the injection water for microbial enhanced oil recovery. The injection water is passed through an ejector where it is entrained and the oxygen subsequently dissolves in the water.
Claims21
The use of an ejector for introducing oxygen into injection water for oil recovery, in which:
- injection water is supplied to said ejector at a predetermined pressure and passes through said ejector as a stream;
- oxygen is also supplied to said ejector at an adjustably controlled rate;
- and
- the pressure and velocity of said water stream passing through said ejector are arranged to draw said oxygen into said water stream,
- wherein said controlled rate of oxygen supply is controlled based on feedback as to the pressure within the oxygen supply line and the pressure differential across the ejector so as to result in a predetermined stable concentration of dissolved oxygen in said injection water.
2 more elements
A method for introducing oxygen into injection water for oil recovery which comprises:
- supplying water to an ejector by means of an injection pump;
- supplying oxygen to the ejector at an adjustably controlled rate;
- and
- drawing said oxygen into the water in the ejector,
- wherein said controlled rate of oxygen supply is controlled based on feedback as the pressure within the oxygen supply line and the pressure differential across the ejector so as to result in a predetermined concentration of dissolved oxygen in said injection water.
2 more elements
Dependencies are inferred from the claim text.