Offshore floating drilling platform for operation in ice-infested waters and harsh environment

An offshore floating platform for oil/gas drilling and exploration in ice-infested waters and harsh environment, wherein a main structure off the platform comprises an upper cone, a transition section, a lower cone, and a bottom frame from top to bottom;

• the upper cone is an inverse frustum, and the lower cone is a normal frustum;
• the transition section is an inverse frustum;
• a top surface of the transition section is coincident with a bottom surface of the upper cone, and a bottom surface of the transition section is coincident with a top surface of the lower cone;
• a size of the bottom frame is larger than that of the bottom surface of the lower cone;
• the upper cone, the transition section, the lower cone and the bottom frame are coincident with a centerline;
• a through center well is designed around the centerline from top to bottom;
• a diameter at the bottom frame is smaller than that of a main body of the center well;
• the upper cone, the transition section and the lower cone are internally connected and divided into plural compartments;
• through ballast compartments are designed outside a sidewall of the upper cone, the transition section and the lower cone;
• a top of the ballast compartments is flush with an upper surface of the upper cone, and the bottom of the ballast compartments is connected with a top of the bottom frame;
• the ballast compartments are internally connected from top to bottom;
• a cross-sectional area of the ballast compartments is consistent at any elevation;
• plural ballast compartments and void compartments are arranged within the bottom frame.