The latest contract marks Rollys Royce’s 100th deal for drillship featuring its propulsion equipment.

During drilling operations, propulsion systems are used to propel the vessels to and from drill sites to accurately maintain their positioning.

To maintain the position of the vessels, high power is very essential and a drillship typically features six such thrusters. The thrusters can be changed underwater, avoiding the downtime and expense of a visit to drydock.

Rolls-Royce Offshore president Anders Almestad said the company has a range of thrusters for the oil and gas sector.

"We are proud to be a strategic partner in the continuing development of the world’s drillship fleets, and particularly delighted to reach the significant milestone of powering 100 of these highly specialised vessels which are at the forefront of oil and gas exploration," Almestad added.

Drillships typically operate in the oil and gas fields off the coasts of Brazil, West Africa and the Gulf of Mexico.

Transocean is a Switzerland-based offshore drilling company.

Value of the latest contract was not disclosed.