Bermuda-headquartered Borr Drilling has agreed to sell a newbuild premium jack-up rigs under construction at Keppel Fels (Keppel Offshore & Marine) in Singapore to a mystery buyer for US$320 million.

Borr confirmed it has signed a binding letter of intent with an undisclosed third party for the sale of three high-specification drilling units — Tivar, Huldra and Heidrun — being fabricated at Keppel Fels.