The company said it is continuing to see signs of recovery in its core oil and gas market as oil prices have climbed 16 percent year-to-date. It comes as a relief for oilfield services providers after a prolonged slump in prices that forced producers to cut capital expenses and defer or cancel contracts.

U.S. shale activity has improved, focused mainly on the Permian basin of West Texas and New Mexico, and Niobrara basin, which spans states including Colorado and Wyoming, Wood Plc said.

The positive remarks from Wood echoed that of smaller rivals Petrofac Ltd, which reported on Tuesday a rise in order intake on higher tendering activity, and Hunting Plc, which saw strong activity in U.S. onshore drilling.

Wood Plc said its revenue is expected to have risen to a range of $5.1 billion to $5.2 billion for the six months ending June 30 and core earnings are expected to be between $250 million to $260 million.

Revenue from the United States made up nearly half of the group's total revenue last year.

The company reported a revenue of 2.33 billion pounds ($3.05 billion) for the first six months of 2017.

Aberdeen-based Wood, which completed its acquisition of smaller rival Amec Foster Wheeler in October last year, said its outlook for the current year is unchanged.

Wood Plc shares rose 1.5 percent in early trading on the London Stock Exchange. ($1 = 0.7649 pounds) (Reporting by Muvija M in Bengaluru; Editing by Amrutha Gayathri)