Transocean, owner and operator of the drilling rig that caught fire and sank in the Gulf of Mexico last year, has concluded that the oil well’s owner, BP, was primarily responsible for the massive spill triggered by the blast.
In a report issued Wednesday after an internal investigation, Transocean said BP used a “faulty” well design, failed to check the integrity of cement used to seal the well and chose a plan for temporarily abandoning the well that “created unnecessary risk.”
Transocean acknowledged the possibility that its crew members failed to detect the signs that hydrocarbons were breaching the cement and steel barriers in the Macondo well and making their way up the drill pipe. Those signs should have raised alarms about a possible blowout, its investigators found.
“None of the individuals monitoring the well, including the Transocean drill crew, initially detected the influx,” the report said, noting that “the results of the critical negative pressure test were misinterpreted.”