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MODU or mobile offshore drilling unit is a term for floating drilling units such as semi-submersibles, jack-up rigs etc.

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Types of Mobile Offshore Drilling Units Or MODU

Mobile offshore drilling units (MODU) are classified into a number of structures, namely:

Drilling barges
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They are mostly utilized for shallow water drilling in calm water conditions. Drilling equipment is placed on to the barges’ decks and towed to the site by tugs. Anchors hold the barges in the position where drilling is to be carried out.
Jack-up Rig
These self-contained drilling structures are as good as the drilling barges only to the exception that these massive structures are positioned onto the site by lowering and rooting their three or four giant legs on the sea floor.

Submersible Rigs
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These rigs are pontoon-based which allow for water ballasting and de-ballasting in order to position, anchor and re-float the massive structure. All necessary drilling equipment is fitted on the platform’s deck, similar to the drilling barges and jack-up rigs.

The only conspicuous change in these structures is that the drilling and production facilities are rested on stilts that are raised to some height above the pontoons. Their operations are limited to shallow waters due to their submersible design.

Drill ships
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These vessels are advantageous over the other drilling units such as the semi-submersibles due to their ultra-deepwater drilling capability and easy mobility. They are basically maritime vessels modified to drill wells in oil and gas fields. They are adapted to provide complete offshore drilling solutions to the clients across the globe. They are equipped with exhaustive mooring and positioning systems and are able to propel from one well to another without outside assistance.