How much does a semi-submersible oil rig cost?

The average cost for offshore rigs can be as much as 15 to 20 times greater than the average cost for land rigs. The least-expensive offshore rigs typically cost nearly $200 million. The average price for offshore oil-drilling rigs is approximately $650 million.

How does a semi-submersible oil rig work?

Semi-submersible rigs make stable platforms for drilling for offshore oil and gas. They can be towed into position by a tugboat and anchored, or moved by and kept in position by their own azimuth thrusters with dynamic positioning.

What is a semi-submersible drilling rig?

A Semi-Submersible Rig or a “Semi-Sub” or a “Semi” or a “Floater” is a drilling rig that is used to drill wells in water depths inaccessible to jack-up rigs (water depths greater than 400 ft). Semi-submersible rigs are buoyant and, unlike jack-up rigs which rest on the seabed, float during drilling operations.

What is the biggest drilling rig in the world?

The DP3 rig Bluewhale 1 has an operating depth of up to 12,000 feet (3,658 meters) and a drilling depth to 50,000 feet (15,240 meters), making it capable of drilling in any waters around the world. It is 387 feet (118 meters) high, equal to a 37-story building.

How does a semi submersible drilling rig work?

A Semi-Submersible Rig or a “ Semi-Sub ” or a “ Semi ” or a “ Floater ” is a drilling rig that is used to drill wells in water depths inaccessible to jack-up rigs (water depths greater than 400 ft). Semi-submersible rigs are buoyant and, unlike jack-up rigs which rest on the seabed, float during drilling operations.

How are semi submersibles used in deep water?

Semi-Submersible. Semi-submersibles are used in deep water applications they are either towed or self propelled to the drilling site. They are either anchored, or moved by and kept in position by their own azipod thrusters with dynamic positioning. Semi-submersible drilling platforms include a submersible hull and an above-water deck…

Which is better a drillship or a semisubmersible?

Simply put, if the primary target is ultra deepwater exploration drilling, the ship is the design of choice. If the primary target is development drilling, the semisubmersible is the design of choice. The key consideration is the mooring system.

When was the first semi submersible drilling platform built?

The first purpose-built semi-submersible production platform was for the Balmoral field in the UK North Sea in 1986. Notable platforms are as follows: Petrobras 36 – Converted from drilling rig Spirit of Columbus and sank in 2001 Atlantis PQ – BP and BHP joint venture