How does a semi-submersible rig work?

Semi-submersibles are the choice for drilling from a floating position, due to the deep water depths. Semi-submersible (“semi”) rigs float like a ship while being towed into position, where their pontoons can then be flooded, partially submerging the rig. Figure 5-4 illustrates a typical semi-submersible.

How much does a semi-submersible rig cost?

The rig is scheduled to be delivered in March 2021 at a cost of $425 million US, with an additional $30 million needed for commissioning.

How do semi-submersible rigs float?

Simple physics. As with oil tankers, heavy load barges and cruise ships, deep sea oil rigs float according to basic physics. As the weight of the rig pushes downwards displaced water pushes upwards, thus keeping the structure afloat.

Which rig can drill in the deepest water?

A Maersk drillship has broken the world record for the deepest water depth for an offshore oil rig after spudding a well located more than two miles below the surface of the ocean. The well, known as the Raya-1 prospect, is being drilled offshore Uruguay in a water depth of 3,400 meters (11,156 feet).

What are semi submersibles?

Semi-submersible may refer to a self-propelled vessel, such as: Heavy-lift ship, which partially submerge to allow their cargo (another ship) to float into place for transport. Narco-submarine, some of which remained partially on the surface. Semi-submarine, which cannot fully submerge.

How is drilling cost calculated?

Total Drilling Cost

  1. Fixed Cost = Annual Overhead Cost / Annual Meter Budget.
  2. Variable Cost = Labor + Fuel + Supervision + Repair Parts + Repair Maintenance + Repair Labor.

What is the deepest oil rig?

Perdido
Perdido (spanish for lost) is the deepest floating oil platform in the world at a water depth of about 2450 meters (8040 feet) operated by the Shell Oil Company in the Gulf of Mexico. At 267 meters, the above water portion of the structure is almost as tall as the Eiffel Tower.

Do oil rigs touch the bottom?

Mobile Drilling Platforms. A jack-up rig can raise and lower itself on three or four massive “legs.” Oil companies float these structures out to a drill site and then lower the legs until they touch the sea floor and elevate the rig out of the water.