| 摘要 |
<p>A constant specific mass flow replacement process for ballasting seawater and LNG or LPG and a multifunction seabase station for producing, storing and transporting offshore petroligenic natural gas are disclosed. The system used in the constant specific mass flow replacement process includes combined tanks (6) including a seawater ballasting cabin (7) and a stored liquid cabin (8), a seawater ballasting pump (1) and a stored liquid unloading pump (5) operated coordinately with each other, a seawater unloading pump (2) and a stored liquid loading pump (4) operated coordinately with each other, control system, corresponding pipes and valves. The upper parts of the seawater ballasting cabin (7) and the stored liquid cabin (8) are respectively filled with compressed natural gas which does not communicate with each other. The compressed natural gas is pumped from the production flow of the upper facility of the station into and out of the seawater ballasting cabin (7) and the stored liquid cabin (8) via autocontrol inlet valves (11,13) and autocontrol outlet valves (10,12) on their top. The multifunction seabase station has a bottom structure and an upper structure (31), which are connected integrally by a number of upright posts (30). The bottom structure has a number of long cylinder structural units (26) and includes one group or more groups of combined tanks (6) with seawater ballasting cabins (7) and stored liquid cabins (8). The multifunction seabase station includes a two submerging cylindrical units floating seabase station which is moored on the seabed by a positioning mooring system, and a raft seated stationary seabase station which is fixed on the seabed by posts. The multifunction seabase station is adapted to different kinds of oil and gas fields, and in particular to the exploitation of marginal oil and gas field. The multifunction seabase station can be transported to the other oil and gas field in order to be reused.</p> |
