Aluminum-plastic composite air bag for pipeline welding and argon filling plugging and preparation method thereof

Abstract

The invention provides an aluminum-plastic composite air bag for pipeline welding and argon filling plugging and a preparation method thereof. The aluminum-plastic composite air bag for plugging is composed of a plurality of layers of aluminum-plastic composite film, the aluminum-plastic composite film is composed by repeatedly stacking a water-soluble barrier layer / aluminum foil layer or the above structural units, due to the fact that the water-soluble barrier material coats the aluminum foil layer surface, the aluminum-plastic composite air bag is endowed with good stiffness, flexibility and gas barrier property, the interior of the composite air bag is embedded with aluminum foil, so that the composite air bag is resistant to corrosion and high in fireproof capability, the aluminum-plastic composite air bag is bonded with a pipeline through a high-temperature-resistant adhesive so as to form a welding and argon filling plugging material with high gas barrier property and high thermal stability, efficient and reliable argon protection atmosphere can be formed in a pipeline with limited space, the welding quality is effectively improved, the construction period is shortened, andthe installation work efficiency is improved, and the aluminum-plastic composite air bag can be applied to touch welding of an ultra-long distance pipeline.

Description

technical field [0001] The invention relates to the field of offshore oil engineering, in particular to an aluminum-plastic composite airbag for pipeline welding and argon-filled sealing and a preparation method thereof. Background technique [0002] With the depletion of global terrestrial oil resources, offshore oil will gradually replace land oil as the main source of human oil and gas resources in the future. It is estimated that 1 / 3 of the world's oil and gas reserves may be on the continental shelf and 1 / 3 in the deep sea. During the development of offshore oil and gas fields, offshore deepwater oil (gas) pipelines often need to be welded on site. The ambient atmosphere during welding will have a great impact on the welding quality. Therefore, the marine deep-water oil (gas) pipeline needs to have perfect gas protection measures during welding, otherwise it will affect the welding quality; A large amount of gas is wasted, and the inflation time required to meet the ...

AI Technical Summary

Problems solved by technology

The disadvantage of this gas shielding method is that the rubber spacer ball must be able to be removed after welding

However, considering the actual situation of welding construction, the disadvantage of this gas shielding method is that the commercially available dissolvable paper is made of a very thin water-soluble film, which will dissolve quickly when it meets water.

The heat generated during the welding process and the welding environment may be affected by vibration, low temperature, strong wind, etc., which may cause the water-soluble paper attached to the pipe wall to fall off; the water-soluble paper is easily ignited by the falling welding slag during the welding process and causes combustion ;It is not good for pipe fittings whose inner wall is not smooth enough

Therefore, the commercially available high-temperature-resistant soluble paper still has great disadvantages, and it is far from meeting the actual needs of effective inert gas protection for welding joints in offshore oil engineering projects.

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