Diving buoyancy tube

Abstract

The invention discloses a diving buoyancy tube. The diving buoyancy tube comprises an upper part buoy and a lower part buoy, wherein the upper part buoy is in a shape of a round platform; the lower part buoy is in a shape of an inverted round platform; the bottom surface area of the upper part buoy is the same as the top surface area of the lower part buoy; the bottom surface of the upper part buoy is fixedly connected to the top surface of the lower part buoy so as to form a whole; central shafts of both the upper part buoy and the lower part buoy are in the same straight line. According to the invention, the upper part buoy and the lower part buoy adopt round platform structural designs, and a traditional cylindrical buoyancy tube is designed to be drum-shaped, so that a three-dimensional effect of the streaming on the diving buoyancy tube is enhanced, eddy flaking off of a wake field is effectively inhibited, and a better water dynamic stability is provided; a gooseneck elbow device is installed on the outer edge of the diving buoyancy tube, so that the installation process of a flexible cross-over tube is simplified, and the risk of the collision of an ROV and the buoyancy tube is reduced.

Description

technical field [0001] The invention relates to the field of marine engineering equipment, in particular to a diving buoyancy cylinder. Background technique [0002] The free-standing riser is a new type of hybrid riser, which has been widely used in deepwater and ultra-deepwater oil and gas field development projects. A typical free-standing riser system uses a rigid riser as the main body, which stands vertically through the top tension of the submersible buoyancy cylinder, and a jumper connects the floating production platform with the gooseneck bend device on the top of the rigid riser. [0003] The submersible buoyancy cylinder is usually located at a position 50-200 meters below the sea surface. Its main function is to provide a certain buoyancy and tension the rigid riser, thereby improving the dynamic response of the rigid riser, reducing the vortex-induced vibration of the rigid riser, and improving the rigidity. Fatigue life of the riser. [0004] The structure o...

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Problems solved by technology

[0004] The structure of the existing submersible buoyancy cylinder is a slender cylindrical shape with a length-to-diameter ratio of 4 to 6. The performance of the submersible buoyancy cylinder with this structure has two disadvantages: (1) Under the action of ocean currents, the hydrodynamic stability is relatively low. Poor, there is obvious vortex shedding, which is easy to cause vortex-induced vibration; (2) The flexible jumper needs to be assisted by ROV (remote control robot) to complete the connection with the gooseneck bend device on the top of the rigid riser, which is easy to cause ROV Collision risk with diving buoyancy cylinders

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