Method for offshore floating petroleum production, storage and offloading with a buoyant structure

A method for offshore floating petroleum production, storage and offloading comprising the steps of:

• a. receiving hydrocarbons from at least one of:
• an FPSO, production risers, or wellhead on the seabed by a floating hull;
• b. processing received hydrocarbons forming hydrocarbon product in the floating hull;
• c. storing the hydrocarbon product, in the floating hull, the floating hull comprising:
• a hull plan view that is circular and wherein the floating hull comprises:
• i. a bottom surface;
• ii. a top deck surface;
• iii. at least three connected sections, joined in series and symmetrically configured about a vertical axis with the connected sections extending downwardly from the top deck surface toward the bottom surface the at least three connected sections comprising of:
• upper cylindrical portion;
• a lower conical section;
• and a cylindrical neck section;
• iv. a moveable hawser connection comprising:
• 1) a trolley slidably engaging the floating hull;
• 2) a trolley shackle connected to the trolley;
• 3) a plate connected to the trolley shackle;
• v. a hose connected to the floating hull for transferring hydrocarbon product between the tanker and the floating hull;
• vi. a set of fins secured to the floating hull configured to provide hydrodynamic performance through linear and quadratic damping;
• offloading the stored hydrocarbon product using the hose to a tanker connected to the plate via a hawser.