Liquid underwater storage, loading and ex-unloading device

Abstract

The invention provides a liquid underwater storage, loading and ex-unloading device. The device comprises a fixed type and a diving type, wherein each of the types consists of four parts, namely an underwater combined storage tank, a pump unit module, a single-point anchoring device and an electric and remote control work station, and the four parts are connected through cables, pipelines and hoses to form a 'closed air pressure communicated seawater and liquid storage constant specific mass flow automatic displacement system'. Operation weight in processes of storage liquid loading and unloading are constant, and the gravity can only change along the vertical Z axis of the center of buoyancy of the facility. The device can realize that: 1) a liquid product produced by an offshore device or a land device is received and stored; 2) a liquid product transported by a shuttle tanker is received and stored; and 3) the device is matched with an offshore production facility to form a complete system for producing, storing and outward transporting offshore petroleum and natural gas. The device has strong applicability, can be used for shallow water, deep water, small, large and marginal oil-gas fields, and can be transferred to other oil-gas fields to be reused conveniently.

Description

Technical field [0001] The invention relates to an underwater storage, loading and unloading device for liquid products in the offshore oil industry (such as crude oil, liquid hydrocarbons, methanol, etc.). When used for the storage and loading and unloading of offshore crude oil, its function is equivalent to an underwater oil depot and The marine "terminal" for receiving and transporting crude oil. The present invention is the first divisional application of the three divisional applications of the PCT application "liquid underwater storage and transportation device and offshore platform based on it" that the applicant is about to file. Background technique [0002] In the process of offshore oil development and production, the storage and export of crude oil is a very important link. The most commonly used offshore crude oil storage and loading and unloading facilities in the world today, except for the FLOATING STORAGE OFFLOADING UNIT (FSO) as a single crude oil storage and u...

AI Technical Summary

Problems solved by technology

2) Traditional dry oil storage

This is because only by maintaining positive internal pressure can external air be prevented from entering; on the other hand, the cargo oil tanks of FPSO and FSO are mainly flat plate structures, and a slightly larger internal and external pressure difference may cause deformation of the plate structure

The second is usually equipped with a ballast water system

[0013] Third, the wet method can only be used for the storage of water-insoluble liquid products such as crude oil, and cannot be used for the

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