Democratic lawmakers in the United States have raised concerns about the decision by Halliburton, the world's second-largest oilfield-services company, to move its headquarters from Texas to Dubai.
Congressman Henry Waxman, a California Democrat, called for hearings on the move to determine its impact on U.S. taxpayers and national security.
Halliburton says the change will help focus its activities in an area where there is a growing need for oil drilling and related work, rather than in the United States, where most oil fields have been developed.
Halliburton will continue to be registered in the United States.
Halliburton was run by Dick Cheney before he became vice president of the United States.
A subsidiary of Halliburton that handles logistics for the U.S. military in Iraq has been criticized in the U.S. press and Congress for alleged overcharges.
Some information for this report was provided by AFP, AP and Reuters.