The pressure integrity test tool and method of pressure integrity of the drill string conveying for testing a casing

摘要

The invention relates to a floating platform ( 1 ) for offshore drilling or production of hydrocarbons, comprising a topsides ( 2 ) and a substructure ( 3 ) having a lower pontoon ( 4 ) and columns ( 5 ) connecting the pontoon ( 4 ) to the topsides ( 2 ). Heave motion (sSUB1/SUB, sSUB2/SUB) of the platform ( 1 ) causes a change in the metacentric height (GM) of the platform. To counteract this change in metacentric height, the columns ( 5 ) are so adapted that the moment of area inertia of the waterline area of the columns ( 5 ) decreases on downward heave motion (sSUB1/SUB) and increases on upward heave motion (sSUB2/SUB).