Schlumberger Ltd. (SLB) Chief Executive Andrew Gould said Monday that a further round of layoffs is likely at the oil services firm due to low energy prices.

"We have already announced a headcount reduction of 5%, which will largely be completed by the end of the first quarter, and a further reduction of a similar amount is likely over the coming months," he said in a speech at the Howard Weil annual energy conference.

-By Jason Womack, Dow Jones Newswires; 1-713-547-9201; jason.womack@dowjones.com