PREVIEW

...   Bangzijia’s drilling platform is a semi-submersible drilling platform.

  What is a semi-submersible drilling platform?

  It is fixed by the anchor chain, the platform is semi-submerged in the sea water, and independently balances buoyancy and gravity.

  Then use the casing drilling technique to drill the subsea.

   Sounds simple enough.

   But it is actually very troublesome, especially the balance and vertical positioning are the difficulties.

   In a ...

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