Oct. 28, 2010 (Bloomberg) -- The cement Halliburton Co. recommended to seal BP Plc’s Macondo well was unstable in tests and may have contributed to the April 20 blowout, the staff of a national commission investigating the accident said.
The National Commission on the BP Deepwater Horizon Oil Spill said documents provided by Halliburton showed at least three tests of the mixture, in February and April, found the mixture unstable. BP received data from at least one test in March, the commission staff said in a letter today.