Patent ID: 9457875
Filing Date: 2016-10-04
CPC Classification: B63B,E21B

Claim Text:
1. A floating type self-lifting drilling platform, comprising: a main deck and an upper structure thereof, a floating cushion, pile legs, a mooring system and a lifting mechanism, wherein the upper structure comprises a module selected from the group consisting of a drilling module, a production module, and a drilling and production module; wherein the floating cushion is located under the main deck, the area and thickness of the floating cushion are both greater than those of the main deck, a middle part of the floating cushion is provided with a moon pool as a passage for the module to pass, and the inner part of the floating cushion is partitioned into multiple cabins; wherein there are three pile legs, a main structure of each of the pile legs is a triangular truss structure, a bottom part of each of the pile legs is rigidly and fixedly connected with the floating cushion, the main deck lifts vertically along the pile legs through the lifting mechanism and is fixed at a preset height, each of the pile legs comprises an upper hollow sealing body, a lower hollow sealing body and a middle section, the upper hollow sealing body and the lower hollow sealing body are both formed by soldering steel plates along the triangular truss structure, the middle section is located between the upper hollow sealing body and the lower hollow sealing body, and the middle section is still of a triangular truss structure through which water can pass; and wherein during the operation, the center of gravity of the floating type self-lifting drilling platform is lower than the centre of buoyancy, and the water line is located within the height range of the upper hollow sealing body and is positioned through the mooring system.