WHERE BP ADDED RISK

摘要

The following are some of the individual design and operation decisions, some of which were approved by federal officials, that helped cut costs prior to the April 20 Macondo well blowout, explosion and Gulf spill.A BP plan review prepared in mid-April recommended against the full string of casing from the top of the wellhead to the well bottom in favor of one that would have provided more barriers to gas flow. Long-string casing saved $7 million to $10 million and time.Instead of the 21 "centralizers" recommended by Halliburton, BP used only six to center the pipe in the well bore to ensure that casing cement flowed evenly around the pipe. Halliburton warned about losing control of gas, but BP declined and saved 10 hours of work.