Offshore building unsealing operation platform and unsealing method thereof

Abstract

The invention relates to the technical field of ocean engineering. The invention discloses an offshore building unsealing operation platform. The system comprises a deck, a tower, a plugging operationmodule, a pile winding crane, a first lifting machine and a second lifting machine, the outer contour of the deck is rhombic; the tower and the pile winding crane are oppositely arranged at the acuteangle end of the deck; the first lifting machine and the second lifting machine are oppositely arranged at the obtuse angle end of the deck; the plugging operation module is detachably arranged on the deck; the acute angle end of the deck can enter a narrow position to be fixed; the construction platform is simple in structure and high in flexibility, the pile winding crane achieves dismantling operation of the to-be-dismantled platform, the detachable plugging operation module achieves plugging operation of a wellhead, after plugging is completed, the plugging operation module can be removed, a deck serves as an area where the dismantling module can be stored, and the space utilization rate and the operation efficiency of the operation platform are improved. The invention further provides an offshore building unsealing method.

Description

technical field [0001] The invention relates to the technical field of marine engineering, in particular to an offshore building unsealing operation platform and an unsealing method thereof. Background technique [0002] At present, offshore drilling activities have been carried out for decades. Some offshore fixed platforms are mostly closed and idle due to the depletion of oil reservoir resources or high secondary recovery costs. Long-term abandonment in relevant sea areas poses potential risks to the surrounding marine environment and shipping. Relevant countries have legislated to dismantle and seal wells for abandoned platforms with a certain number of years. It is estimated that in the near future, about 3,000 oil and gas wells on nearly 500 oil and gas production facilities in overseas countries will be included in the abandonment plan, resulting in a fairly large-scale well demolition operation market, which will bring hundreds of billions of dollars in the future. ...

AI Technical Summary

Problems solved by technology

[0003] In China, due to the late start of offshore oil exploration activities, there has not yet been a large-scale platform that needs to be dismantled. Therefore, the traditional operation method is still used to dismantle the abandoned fixed platform. This method is in the form of floating cranes and barges. For hoisting and transshipment, a certain part of the modules of the fixed platform must first be disassembled and the wellhead and downhole plugging and abandonment operations must be carried out. Due to the complex environment around the platform, floating cranes and barges often cannot be dismantled and transferred very smoothly, which is very time-consuming and labor-intensive, and the cost of unpacking is relatively high

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