Method and system for providing fuel gas to a topside facility
AssigneeFMC Kongsberg Subsea AS
InventorSteinar Eriksen
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Abstract
A method for providing fuel gas to a top-side processing system of a sub-sea well stream is provided. The method comprises separating the sub-sea well stream in a sub-sea arranged three phase separator obtaining a crude oil stream, and a crude natural gas stream, separating acid gasses and/or water from the crude natural gas, pressurizing the gas stream sub-sea, adding at least part of the pressurized gas to the crude oil stream subsea, transporting the added gas together with the oil to the topside, separating the gas from the oil in a first stabilization stage and providing the separated gas as fuel gas to a fuel gas system.
Claims13
A method for providing fuel gas to a topside processing system for a subsea well stream, the method comprising:
- separating the subsea well stream in a subsea arranged three phase separator to thereby obtain a crude oil stream and a crude natural gas stream;
- separating at least one of acid gasses and water from the crude natural gas stream;
- pressurizing the crude natural gas stream subsea;
- adding at least part of the pressurized gas to the crude oil stream subsea;
- transporting the added pressurized gas together with the crude oil to the topside processing system;
- separating the pressurized gas from the crude oil in a first stabilization stage;
- and
- providing the separated gas as fuel gas to a fuel gas system.
A subsea well topside fuel gas-providing system which comprises:
- a subsea arranged three phase separator which includes a well stream inlet, a crude natural gas outlet and a crude oil outlet;
- a riser which includes a subsea riser inlet in fluid communication with the crude oil outlet and the crude natural gas outlet;
- the riser further comprising a topside riser outlet in fluid communication with a topside arranged stabilization unit which includes a stabilized crude oil outlet and a fuel gas outlet.
Dependencies are inferred from the claim text.