Subsea deoxygenation in a water injection process plant
AssigneeCameron Solutions, Inc.
InventorBrent Knox-Holmes
Life of this patent
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Abstract
A water injection process plant includes a catalytic deoxygenation unit located subsea that makes use of a reducing agent sent from topsides in liquid form. The catalyst is preferably a palladium catalyst or its equivalent. The reducing agent is an oxygen scavenger such as but not limited to hydrazine, carbohydrazide, sodium erythorbate, methyl ethyl ketoxime (“MEKO”), hydroquinone, diethylhydroxylamine (“DEHA”), formic acid (methanoic acid). A chemical umbilical can be used to deliver the reducing agent to a mixer located upstream of the deoxygenation unit, where the agent is mixed with seawater containing oxygen.
Claims19
A deoxygenation system comprising:
- a catalytic deoxygenation unit located subsea;
- and
- a reducing agent in liquid form located topsides;
- the catalytic deoxygenation unit configured to operate at subsea ambient pressure and receive a mixture of a seawater stream containing, oxygen and the reducing agent.
A method to deoxygenate a seawater stream subsea, the method comprising:
- delivering from topsides to subsea a reducing, agent in liquid form;
- mixing the reducing agent with a seawater stream containing oxygen;
- and
- deoxygenating a mixture of the reducing agent and the seawater stream subsea by reacting the reducing agent with the oxygen in the presence of a catalyst in a catalytic deoxygenation unit located subsea;
- wherein the catalytic deoxygenation unit is configured to operate at subsea ambient pressure.
A biofouling control, deoxygenation and filtration system comprising:
- a biofouling control unit located subsea, the biofouling control unit including chemical dosing means;
- a deoxygenation system comprising a catalytic deoxygenation unit located subsea and configured to operate at subsea ambient pressure and receive a seawater stream containing oxygen and a liquid reducing agent, the catalytic deoxygenation unit located downstream of the biofouling control unit and including a palladium catalyst;
- a liquid reducing agent source located topsides, the liquid reducing agent being selected from the group consisting of hydrazine, carbohydrazide, sodium erythorbate, methyl ethyl ketoxime, hydroquinone, diethylhydroxylamine, and formic acid;
- a chemical umbilical connected to the liquid reducing agent source and the catalytic deoxygenation unit and configured to deliver the liquid reducing agent from the liquid reducing agent source located topsides to the catalytic deoxygenation unit located subsea;
- and
- a filtration system located subsea and including selectively permeable membrane means configured to receive a stream exiting one of the biofouling control unit or the catalytic deoxygenation unit.
Dependencies are inferred from the claim text.