Auxiliary lifting pontoon and method for lifting underwater object by using the same

Abstract

The invention relates to an auxiliary lifting pontoon and a method for lifting an underwater object by using the same. The auxiliary lifting pontoon comprises a pontoon main body with two closed ends, wherein the pontoon main body comprises a cylindrical middle cabin section and two side cabin sections; the two side cabin sections are arranged at the two opposite ends of the middle cabin section; and a cavity of the middle cabin section and cavities of the side cabin sections are partitioned from each other. A first lifting lug and a second lifting lug are respectively arranged on a first side and a second side of the pontoon main body, wherein the first side and the second side are opposite to each other. First ports communicated with the cavities are respectively formed in first sides of the two side cabin sections so that the cavities of the side cabin sections can be inflated and deflated. Second ports communicated with the cavities are respectively formed in the side walls of second sides of the two side cabin sections so that water can flows in or out of the cavities of the side cabin sections. Through an underwater lifting function of the auxiliary lifting pontoon, the underwater object to be lifted, such as a single point mooring system and the like, can be lifted to am appropriate water depth for air downhole maintenance operation; therefore, the operation efficiency can be increased, the influence of wind waves can be reduced, the safety in construction can be enhanced, and offshore construction time and cost can be also reduced.

Description

technical field [0001] The invention relates to the field of marine engineering mooring maintenance, in particular to an auxiliary lifting buoy and a method for lifting and lowering underwater objects with the auxiliary lifting buoy. Background technique [0002] With the vigorous development of offshore oil and gas, single-point mooring systems are more and more widely used. After the FPSO is released, the single point of the mooring system is generally located at about 50m underwater. In this water depth, air diving operation is used to repair the single point mooring system. Divers have a long decompression time, short operation time, low operation efficiency, and increased The construction difficulty and operation cost are greatly increased. SUMMARY OF THE INVENTION [0003] The technical problem to be solved by the present invention is to provide an auxiliary lifting buoy and a method for lifting and lowering underwater objects with the auxiliary lifting buoy. [00...

AI Technical Summary

Problems solved by technology

After the FPSO is freed, the single point of the mooring system is generally located at about 50m underwater. At this water depth, air diving is used to maintain the single point mooring system. The diver decompression time is long, the operation time is short, and the operation efficiency is low. Increased construction difficulty and operating costs

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