Over the past two years, operational costs have totaled $1bn – that's $10,000 in costs for each claim that has received an eligibility notice, while hundreds of thousands more claims still remain to be examined." Juneau was not immediately available for comment. Last month BP filed a petition to the supreme court seeking to undo parts of the massive settlement agreement agreed in the New Orleans court related to the fatal spill. The Macondo well blowout and rig explosion in April 2010 killed 11 people and spilled millions of barrels of oil for 87 days after the blast. The settlement protects Halliburton from certain punitive damages if the court were to rule later that the company had been negligent or 'grossly negligent' for its role in the blowout, Chief Financial Officer Mark McCollum said. Halliburton provided cementing services for BP at the well, including the placement of "centralizers" that help stabilize the well bore during cementing.