A device for restraining the relative motion between the heave plate and the main hull of the dry tree semi-submersible platform

Abstract

The invention discloses a relative motion inhibition device for a heavy plate of a dry-tree semi-submersible platform and a main hull. The relative motion inhibition device comprises an X-shaped motion inhibition anchor cable group, an anchor cable guide locking device and an energy buffer device, wherein the X-shaped motion inhibition anchor cable group comprises two upper anchor cables and two lower anchor cables, and the two upper anchor cables and the two lower anchor cables are arranged in an X shape between a lower heavy plate of the dry-tree semi-submersible platform and the main hull;the anchor cable guide locking device is arranged on a stand column of the dry-tree semi-submersible platform and can apply pretension to the upper anchor cables and lock the upper anchor cables; thelower anchor cables are connected with the lower heavy plate; and the upper anchor cables are connected with the energy buffer device after being guided by the anchor cable guide locking device. According to the relative motion inhibition device, an elastic support is adopted at an X-shaped anchor cable lifting device, and the X-shaped anchor cables are introduced to an energy buffer tank of the stand column of the platform to be connected with balances and are used for buffering the inertial force caused by the motion of the lower heavy plate of the platform, so the impact force of the anchorcables and a base structure can be effectively reduced, and the fatigue strength and the reliability of corresponding components are improved.

Description

technical field [0001] The invention relates to a device for suppressing relative motion between a dry tree semi-submersible platform heave plate and a main hull, and belongs to the technical field of deep-water marine oil and gas development. Background technique [0002] Deep-water floating platforms are the main equipment for deep-water offshore oil and gas development. Semi-submersible platforms have obvious advantages in terms of construction, installation and economy compared with single-column platforms and tension-leg platforms. However, the heave motion performance of semi-submersible platforms is poor at present, and wet-type trees must be used as deep-water oil and gas development and production platforms, and wet-type trees are complex in technology and expensive. The dry tree has the advantages of convenient workover, low operating cost, short downtime and good flow safety. Due to its requirement of low platform heave motion, currently only tension leg platforms...

AI Technical Summary

Problems solved by technology

Since the above connection method is adopted between the upper main hull and the lower heave plate, and the length of the slender flexible member is longer, there will be relative motion between the upper main hull and the lower heave plate, especially in severe sea conditions such as typhoons Large relative motion will be generated, resulting in the flexible connecting member between the slender flexible member structure and the upper main hull and the lower heave plate, and the top tensioned riser passing through the middle of the lower heave plate and the lower heave plate. Structural design and manufacture of board joints are difficult and costly

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