A underwater drilling underplate for TLP

The utility model discloses an underwater drilling underplate for TLP, including the underplate main structure body, guide line positioning system and mechanical guide cylinder, guide line positioning system and mechanical guide cylinder are installed on the underplate main structure body, and mechanical guide cylinder adopts quick detachable structure. The utility model discloses well TLP subsea wellhead underplate is the necessary infrastructure of TLP well drilling, the utility model designs a release restraint after accomplishing the well drilling, is dismantled with the guide cylinder to the mechanical guide cylinder that can dismantle fast. It combines the steel construction, can dismantles mechanical direction, carries out functions such as boring well casing direction and installation riser head direction. Its design is for solving the functional requirement that TLP well drilling clamping orient satisfies needs resilient mounting under the first permanent operating mode on the throne of retained wate