The 10-well contract starts in July 2014 and runs until next June with two one-well options included.
Ensco said it will provide its 1500-foot water depth semi-submersible Ensco 5005 at a dayrate in the low $230,000s.
PTTEP said recently it plans to drill six further appraisal and exploration wells in Block M-3 in the Gulf of Moattama, starting in the fourth quarter of 2014.
