Hess will use the buyout funds to continue repurchasing shares under its existing $4 billion authorisation.
PTT Exploration and Production Public Company Limited snapped up both the Sinphuhorm and Pailin fields for the billion dollar price tag.
The two assets produced an average of 17,000 barrels of oil equivalent per day in 2013.
Hess will use the buyout funds to continue repurchasing shares under its existing $4 billion authorisation.