What is Semi-submersible Platform?

Information about Semi-submersible Platform

A Semi-submersible platform or rig, is a mobile structure used for drilling for oil and natural gas in offshore environments.

Their superstructures are supported by columns sitting on hulls or pontoons which are ballasted below the water surface. They provide excellent stability in rough, deep seas.

Semi-submersible platforms have legs of sufficient buoyancy to cause the structure to float, but of weight sufficient to keep the structure upright. Semi-submersible rigs can be moved from place to place; and can be ballasted up or down by altering the amount of flooding in buoyancy tanks; they are generally anchored by cable anchors during drilling operations, though they can also be kept in place by dynamic positioning. Semi-submersibles can be used in depths from 600 up to 35,000 feet (180 to more than 10,600 m).
The acronym OIL can refer to:
  • Output Input Language
  • Office of Infrastructure and Logistics - Luxembourg
  • Ontology Inference Layer or Ontology Interchange Language, an Ontology Infrastructure for the Semantic Web.
  • Oil India Limited.

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gas, especially when compared to other energy sources such as electricity. Before natural gas can be used as a fuel, it must undergo extensive processing to remove almost all materials other than methane.
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Offshore has three principal meanings:
  1. Physical - in the sea away from the shore; not on the shoreline but out to sea.
  2. Offshore Industry - Industry related to equipment for offshore oil and gas
  3. Financial

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semi-submersible or semisubmersible is a watercraft that can put much of its bulk underwater.

With a relatively small area above the water's surface, the semi-submersible is less affected by the waves than a normal ship, but must be trimmed continuously.
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Dynamic positioning (DP) is a system to automatically maintain a ship’s position and heading by using her own propellers and thrusters. This allows operations at sea where mooring or anchoring is not feasible due to deep water, congestion on the sea bottom (pipelines,
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