Seabed oil storage system

Abstract

The invention discloses a seabed oil storage system, which comprises a seabed oil storage tank and a platform; wherein a positioning steel pile is fixedly arranged in the axial direction of the seabed oil storage tank, and two ends of the positioning steel pile extend out of the seabed oil storage tank; and one end of the positioning steel pile is connected with the platform. An enclosed structure is adopted for the tank body of the seabed oil storage tank, the oil storage space of the tank body is isolated from surrounding seawater, and water pollution on stored pure crude oil caused by the traditional oil-water substitution oil storage process is avoided. According to the seabed oil storage system, since the seabed oil storage tank is divided into an upper space and a lower space, i.e. an oil storage area and a construction and operation area, the upper space and the lower space are mutually airtight and are mutually not communicated, when water seepage and leakage caused by reasons of non-compact stuffing of a reserved construction hole or a reserved construction seam and the like after completion of construction in the construction and operation area occur, the oil storage area can not be affected, and the water pollution and the leakage of crude oil caused by constructional reasons are prevented.

Description

technical field [0001] The invention relates to a seabed oil storage system and the technical field of crude oil storage in offshore oil fields. Background technique [0002] For marginal oil fields in shallow water, it is sometimes necessary to store crude oil at sea. Due to the limitation of water depth, it is difficult for large oil storage ships to enter. At this time, it is more common to use fixed offshore storage tanks to store oil. Offshore fixed oil storage tanks are usually divided into offshore fixed platform oil storage tanks and seabed oil storage tanks. [0003] Offshore fixed platform oil storage tanks are built on fixed steel structure platforms, usually steel storage tanks. This kind of platform is generally only used for pure oil storage. Since all the crude oil weight, self-weight of the steel storage tank, self-weight of the steel structure platform and the wave force and wind force it bears are all borne by the lower steel piles, the diameter and lengt...

AI Technical Summary

Problems solved by technology

However, due to the large water-retaining surface of the tank body in seawater, relatively large forces such as waves, currents, and tides will be generated, and correspondingly large structural components are required to resist, resulting in an increase in structural cost

At the same time, the large water retaining area will easily produce a large tank bottom scouring effect. Since the tank bottom is connected with seawater, when the oil tank is close to full load, the crude oil in the tank may overflow

[0005] The crude oil output of marginal oilfields is not large, and the development cost is relatively high. The development cost is particularly sensitive to the development benefits. Since the cost of the above two types of offshore storage tanks is relatively high, the application in marginal oil fields may drag down their development benefits, or even produce negative benefits.

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