Design of Construction Mode of Offshore Gas Storage in the Whole Sea—Taking H Gas Field in Liaodong Bay, Bohai Sea as an Example

Offshore LNG import has become one of the four major natural gas import channels. One of the potential targets of gas reservoir reconstruction around coastal developed areas is offshore near-exhausted gas reservoir resources. Therefore, in recent years, the related research on offshore gas storage is gradually carried out. In view of the congested shipping lanes in China’s coastal areas, the “onshore gas reverse transport” mode used in the construction of offshore gas storage abroad may be difficult to solve the gas source problem of offshore gas storage due to the scarce resources of LNG receiving stations, busy sea lanes and other problems. Therefore, this paper innovated and proposed a brand new storage construction mode—the whole-sea offshore gas storage construction mode, which provides a new idea for offshore gas storage construction. The main difference between this model and other offshore gas storage models is that in this model, the gasification storage units are located at sea, and the main gasification units used are floating gasification storage units (FSRU, Floating Storage and re-to-feedstock Unit); GBS (Gravity Based Structure). Taking H gas field in Bohai Sea as an example, this paper studies the scheme of reservoir construction under this model. The research results show that H gas field can be converted into “whole sea” offshore gas storage, which can provide reference for other offshore gas storage construction.