Halliburton may also be implicated in the oil spills in the Timor Sea off Australia in August 2009 and in the Gulf of Mexico in April 2010 for improper cementing . Halliburton staff were employed on the Transocean operated '' Deepwater Horizon '' oil rig in the Mexican Gulf . Halliburton staff completed cementation of the final production well 20 hours prior to the Deepwater Horizon drilling rig explosion , but had not yet set the final cement plug
Timor Sea
Montara oil spill
Halliburton