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.
The daylong cementing operation followed earlier injections of heavy drilling mud this week that had subdued the upward pressure of oil and gas inside the deep-sea Macondo well. The crippled wellhead was provisionally capped in mid-July.
