Cairn Energy has chartered the Valaris JU-123 for work in the UK North Sea.
The one-well contract is expected to get underway in the second quarter of next year, with an estimated duration of 72 days.
Offshore drilling contractor Valaris made the announcement as part of a swathe of new contract wins for work across the globe.
Edinburgh-headquartered Cairn previously said it is on course to spud Diadem – a 50-50 venture with Shell – in Q2 2022.
The prospect is expected to deliver around 30 million barrels gross.
In March last year, Shell and Cairn completed a 50-50 swap deal for Diadem, as well as Jaws, which is also forecast to deliver about 30 million barrels.
Valaris has also been awarded a contract with Taqa for Valaris JU-12 – a heavy-duty harsh environment jackup – for work offshore the Netherlands.
The contract is expected to commence in the fourth quarter of 2021 with an estimated minimum duration of 60 days.
It covers the preparation of a wellbore for the Porthos CO2 transport and storage project.
In conjunction with this contract, the jackup will be upgraded with a selective catalytic reduction (SCR) system to eliminate select emissions.
Valaris has also been awarded a one-well contract with Carnarvon Petroleum offshore Timor-Leste for Valaris JU-107, a heavy-duty modern jackup.
The contract is expected to commence in the fourth quarter of 2021 with an estimated duration of 30 days.