Flexible underwater storage tank

Abstract

The invention relates to a flexible underwater storage tank which is characterized by comprising hollow unit tank bodies, wherein each unit tank body comprises a flexible shell, and the flexible shell successively comprises a liner layer, a framework layer and an external protection layer from inside to outside; an oil inlet pipe and an oil outlet pipe communicated with the chamber in each unit tank body are arranged at the top of each unit tank body. The flexible underwater storage tank has the beneficial effects that the flexible underwater storage tank is combined and mounted in a form of unit bodies and solves the problem of oil pollution; the flexible tank bodies solve the problem of poor seawater ballast buoyancy, and the rubber flexible tank bodies can adapt to the corrosion of oil and has heating and heat preservation functions; a plurality of unit tank bodies can be connected in series and in parallel to realize single control; the flexible underwater storage tank has multiple leakproof safety protection designs, is not affected by the depth of seawater in the using process, can be suitable for various oil and gas fields, particularly can be reused for many times in marginal oilfield development, and significantly reduces the investment cost.

Description

technical field [0001] The invention relates to a flexible underwater storage tank suitable for storing liquids underwater, especially suitable for an independent oil storage device in the mode of an offshore oil drilling and storage platform. Background technique [0002] At present, in fact, the development and production facilities of offshore oil and gas face many technical difficulties, one of which is the storage of oil and gas after exploitation. The traditional mining method generally adopts the way of laying submarine pipelines to transport the mined oil and gas to the user end or the ship for oil and gas transportation. With the development of oil field development scale to miniaturized exploration, some oil fields in shallow water or offshore are far away from the user end. However, when there is no infrastructure such as submarine pipelines to rely on, transportation becomes a serious constraint. Large ships have a large draft and cannot approach oil fields in sh...

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Problems solved by technology

[0003] In the current underwater storage technology, the structural form commonly used in the experience of underwater storage tanks is to build storage tanks with underwater reinforced concrete structures, load and unload crude oil into the storage tanks, and rely on the volume and weight of reinforced concrete to balance the realization of tanks. The buoyancy difference caused by the loading and unloading of the body mainly adopts two methods, one is the oil-water replacement method, and the other is the oil-gas replacement method. Both replacement principles require ballast tanks to eliminate the buoyancy difference. Oil storage The low utilization rate of space efficiency is a common problem. In the former method, there is direct contact between oil and water, and there is a problem of evaporation and dissolution at the contact interface. Seawater must be polluted by oil. When oil and water are replaced, the polluted sea must be discharged to the ocean. This method has been banned in Europe and the United States, and is also banned in China. Although isolation devices are used at the oil-water separation interface, a soft material for isolation, such as plastic or high Molecular plastic film layer, etc., the thickness is thin and the pressure is very low. In use, it is generally inconvenient to install in large storage tanks. During use, there are fatigue cracking problems caused by severe wrinkles, and rupture caused by pressure increase. The risk of oil leakage cannot be avoided; in the oil-gas replacement method, it is also necessary to design the storage tank according to the way of installing a pressure vessel, and the internal inert gas occupies a large space. When this method is used in a large storage tank, the underwater water The pressure is high, the thickness of the pipe wall needs to be designed very thick, and the weight of the tank body is large, resulting in low bearing pressure and limited storage capacity, which cannot realize large-capacity storage. There is also the problem of oil and gas pollution emissions. To sum up, a large capacity can be realized underwater Storage of oil and gas technology needs further breakthrough

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