| 摘要 |
An off-shore drilling platform for hydrocarbons has an oscillating column pivoted at its base and kept stable by upward hydrostatic pressure, with hydrocarbon storage in the column. The difference in the densities of water and hydrocarbons in the column is compensated whereby the forces acting on the base of the column and on the pivot remain substantially constant. The column has two compartments, a lower one filled with water, and an upper one forming a float. Compensating means are pumps and valves arranged so that when the hydrocarbon is introduced into the lower compartment it drives out water and corresponding mass of liquid is pumped into the upper compartment. The pumps and valves are servo-controlled to the levels of the two liquids. A gas pocket over the hydrocarbon is kept at constant pressure by a pumping system linked to the servo-control.
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