Seaborne boundary condition simulation method for FLNG device liquidation process

Abstract

The invention relates to a seaborne boundary condition simulation method for an FLNG device liquidation process. The method is characterized by comprising the following steps of: (1) establishing a three-dimensional control volume unit, working mediums of which flow in an FLNG liquidation process system, under a sea condition, and carrying out analysis to obtain a momentum equation of working medium flow directions; (2) obtaining a three-dimensional motion equation of a hull or a platform on the basis of sea condition basic data of an actual operation sea area; (3) carrying out calculation to obtain a translational motion equation and an angular motion equation of working medium gravity centers; (4) establishing a one-dimensional fluid flow equation for representing flow, in the FLNG liquidation process system, of the working mediums under the actual sea condition; and (5) calculating sea condition boundary condition parameters according to the one-dimensional fluid flow equation, and loading the sea condition boundary condition parameters into a FLNG device liquidation process dynamic model so as to realize application of actual sea condition environment to FLNG device liquidation process. The method can be widely used for improving the simulation facticity and emergency working condition prediction correctness of the FLNG device liquidation process.

Description

technical field [0001] The invention belongs to the field of offshore petroleum engineering, in particular to a method for simulating and simulating offshore boundary conditions used in the liquefaction process of an FLNG device. Background technique [0002] In the development of deep-water gas fields, due to the distance from the coast, the investment and construction of the traditional pipeline transportation mode is difficult and the risk of flow safety is high. The integration of functions such as liquefaction, storage, loading and unloading has become the first choice for the development of deep offshore gas fields and marginal gas fields. [0003] However, in the process of designing the upper liquefaction process module of the FLNG unit, due to the special environment at sea, it is impossible to accurately describe the influence of sea conditions on the process and equipment performance during the simulation design process of the liquefaction process, and the externa...

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Problems solved by technology

[0003] However, in the process of designing the upper liquefaction process module of the FLNG unit, due to the special environment at sea, it is impossible to accurately describe the influence of sea conditions on the process and equipment performance during the simulation design process of the liquefaction process, and the external sloshing also affects the process dynamic simulation process. There is no efficient way to bound it

In order to meet the requirements of offshore safety, the FLNG process flow designed by the existing method has a large process design margin and a large space occupation, which leads to a high proportion of investment in the FLNG upper liquefaction process module, and the overall cost is not economical and effective.

Moreover, relying solely on experiments for data collection and analysis requires a lot of time and high economic costs.

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