Songa Offshore AS was founded in January 2005 with the purchase of the two semisubmersibles, Mata Redonda and La Muralla. Mata Redonda was renamed Songa Venus and La Muralla was renamed .
On August 15, 2017, announced it was acquiring Songa Offshore for US$1.2 billion in cash, and an enterprise value of approximately US$3.4 billion. The complete transfer of business to Transocean was done by Ja. .
Songa Offshore operates seven oil rigs. • Songa Dee• Songa Delta• Songa Trym• Songa Equinox (Cat D-1).
[pdf] 
As of June 2010, there were over 620 mobile offshore drilling rigs (jackups, semisubs, drillships, barges, etc.) available for service in the worldwide offshore rig fleet. .
Offshore drilling is a mechanical process where a is drilled below the seabed. It is typically carried out in order to explore for and subsequently extract that lies in rock formations beneath the. .
Offshore drilling is usually done from platforms generically known as mobile offshore drilling units (MODU), which can be of one of several. .
Offshore oil and gas production is more challenging than land-based installations due to the remote and harsher environment. Much of the innovation in the offshore petroleum. .
Offshore oil production involves environmental risks, most notably from oil tankers or pipelines transporting oil from the platform to onshore facilities, and from leaks and accidents on the platform (e.g. and .
Around 1891, the first submerged oil wells were drilled from platforms built on piles in the fresh waters of the in . The wells were developed by small local. .
Notable offshore fields include:• the • the (offshore , , , and )• (in the and , part of the Ventura Basin) .
• • • • • •
[pdf] A drilling riser is a conduit that provides a temporary extension of a to a surface drilling facility. Drilling risers are categorised into two types: marine drilling risers used with subsea (BOP) and generally used by floating drilling vessels; and tie-back drilling risers used with a surface BOP and generally deployed from or very stable floating platfor.
[pdf] 
