QP announces crude oil prices for September GMT 13:38 2012 Sunday, 07 October Last Updated: 06:49:16 GMT Doha - QNA Qatar Petroleum ( QP ) has announced its official prices of onshore and offshore crude oil for September, 2012. QP set the onshore crude oil price at USD 114.15 per barrel and the offshore crude oil price at USD 112.30 per barrel.