Back to results
US 11,598,193 B2Granted
Subsea processing of crude oil
AssigneeSubsea 7 Norway AS
InventorSigbjorn Daasvatn
Life of this patent
Estimating the term…
Abstract
A subsea production unit for subsea treatment of oil has a frame that supports an onboard multiphase separation system for separating gas and water from a wellstream containing oil. The subsea production unit also includes an onboard water treatment system for cleaning oil from water that is produced by the separation system.
Claims9
A method of separating fluids from a multiphase oil-containing wellstream, the method comprising:
- separating gas and water from the wellstream to produce oil;
- cleaning oil from the water that is produced by the separation step by passing the produced water through at least one flotation unit and mixing the produced water with gas separated from the wellstream in the separation step;
- storing oil produced by the separation step in a storage tank and performing the cleaning step also on water settled from the stored oil;
- and
- injecting the produced water, with gas separated from the wellstream in the separation step and gas separated from the oil in the storage tank, into a subsea reservoir after cleaning;
- the separation, storage and cleaning steps each being performed subsea onboard a frame of a transportable subsea production unit provided on the seabed.
3 more elements
Dependencies are inferred from the claim text.