Novel semi-submersible platform and mounting method thereof

Abstract

The invention discloses a novel semi-submersible platform and a mounting method thereof. The novel semi-submersible platform comprises a platform hull and a top tensioning type steel vertical pipe; the top tensioning type steel vertical pipe comprises an upper-end oil extraction vertical pipe and a lower-end oil extraction vertical pipe; a reclaimed water buoy is connected between the upper-end oil extraction vertical pipe and the lower-end oil extraction vertical pipe; a truss is arranged on the reclaimed water buoy, a vertical pipe guide frame is arranged at the upper end of the truss, the vertical pipe guide frame is movably connected with a main deck of the platform hull through a spring support, and the spring support is fixedly connected with a main deck; the top of the upper-end oilextraction vertical pipe is matched with the vertical pipe guide frame; a Christmas tree is arranged on a vertical pipe fixing frame; and the Christmas tree is connected with a crude oil treatment device arranged on the main deck of the platform hull. The novel semi-submersible platform has independent buoyancy, and the vertical load of the novel semi-submersible platform on the platform is reduced; and decoupling of heaving motion and longitudinal and transverse shaking motion of the top of the vertical pipe and the platform hull is achieved, so motion of the platform is not directly transmitted to the vertical pipe, and the dry tree oil extraction function can be achieved.

Description

technical field [0001] The invention relates to a novel semi-submersible platform and an installation method thereof, belonging to the field of marine engineering. Background technique [0002] Semi-submersible platforms are the main equipment for deepwater oil and gas development. The main advantages of the semi-submersible platform are that it is less difficult to construct, the overall cost is relatively low, and the deck area is large. The motion performance of the semi-submersible platform is not as good as that of the Spar platform and the TLP platform, so the dry production technology (the Christmas tree is located on the platform deck) cannot be used, only the wet production technology (the Christmas tree is located underwater), and the top tension type cannot be used. Riser, in the process of oil and gas field development, the installation and maintenance costs of wellhead and subsea production system are high, which increases the overall engineering investment. ...

AI Technical Summary

Problems solved by technology

However, increasing the draft of the hull will lead to an increase in the center of gravity of the platform, which is not conducive to stability and construction, and the installation of the heave plate will make the platform installation process more complicated, and the connection structure between the heave plate and the platform is prone to fatigue damage. The tree semi-submersible platform is still in the research and development stage and has not yet moved towards engineering practice

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