From a press release from The U.S. Department of Justice:



According to court documents, on April 20, 2010, while stationed at the Macondo well site in the Gulf of Mexico, the Deepwater Horizon rig experienced an uncontrolled blowout and related explosions and fire, which resulted in the deaths of 11 rig workers and the largest oil spill in U.S. history. Following the blowout, Halliburton conducted its own review of various technical aspects of the well’s design and construction. On or about May 3, 2010, Halliburton established an internal working group to examine the Macondo well blowout, including whether the number of centralizers used on the final production casing could have contributed to the blowout. A production casing is a long, heavy metal pipe set across the area of the oil and natural gas reservoir. Centralizers are protruding metal collars affixed at various intervals on the outside of the casing. Use of centralizers can help keep the casing centered in the wellbore away from the surrounding walls as it is lowered and placed in the well. Centralization can be significant to the quality of subsequent cementing around the bottom of the casing. Prior to the blowout, Halliburton had recommended to BP the use of 21 centralizers in the Macondo well. BP opted to use six centralizers instead.

As detailed in the information, in connection with its own internal post-incident examination of the well, in or about May 2010, Halliburton, through its Cementing Technology Director, directed a Senior Program Manager for the Cement Product Line (Program Manager) to run two computer simulations of the Macondo well final cementing job using Halliburton’s Displace 3D simulation program to compare the impact of using six versus 21 centralizers. Displace 3D was a next-generation simulation program that was being developed to model fluid interfaces and their movement through the wellbore and annulus of a well. These simulations indicated that there was little difference between using six and 21 centralizers. Program Manager was directed to, and did, destroy these results.

In or about June 2010, similar evidence was also destroyed in a later incident. Halliburton’s Cementing Technology Director asked another, more experienced, employee (“Employee 1”) to run simulations again comparing six versus 21 centralizers. Employee 1 reached the same conclusion and, like Program Manager before him, was then directed to “get rid of” the simulations.