Green Business News: BP cements Gulf oil well ahead of permanent plug BP cements Gulf oil well ahead of permanent plug ================================================================================ feeds.reuters.com on 05 August, 2010 06:42:19 HOUSTON (Reuters) - BP finished pumping cement into its ruptured oil well in the Gulf of Mexico on Thursday to seal off the source of the world's worst offshore spill, paving the way to permanently plug the blow-out later this month.