The company will book a $10 million pre-tax gain on the sale to the undisclosed buyer, as its book value was $54 million.

The company has year to date unloaded three jack-up rigs ordered two high-spec new models, chief financial officer Jay Swent said in a statement.

"Continuous high-grading keeps us at the forefront of industry technology and we continue to have the largest premium jackup fleet in the world," he added.

The