FLOATING DRILLING AND PRODUCTION OFFSHORE PLATFORM Russian patent published in 2012 - IPC B63B35/44 B63B35/08 E21B43/01 E21B17/00 F03D9/02 

FIELD: transport.

SUBSTANCE: invention relates to oil-and-gas industry. Proposed platform comprises water separating casing string with buoyancy elements secured on its outer surface over its entire length and arranged between well mouth and platform and coupled therewith. Platform is equipped with ice breaker to prevent its destruction and displacement relative to well mouth. Wedge-like safety belt is arranged along platform outer bottom perimetre, inclination of wedge faces being equal to 5°-85°. Rods are arranged along platform hull perimetre and provided with 5-500 m-thick layer of resilient material and steel strip. One to four pollution-free windmill electric power stations are mounted on platform deck. In drilling soft rocks, drilling string with cylinders and rock destruction bore bit is arranged directly on said rocks. Sea casing string is fitted inside drilling string without cylinders for well soft roof consolidation. Drilling pipes and water separation temporary and permanent casing strings represent all-cast or all-welded detachable cylinders filled by pressurised nitrogen gas or inert gas made up of cast shell with one welded seam on every side. Openings are made at platform bottom.

EFFECT: higher safety and anti-ice protection.

17 dwg