Halliburton Energy Services...claims an employee who helped develop strategy for litigation over the Deepwater Horizon explosion quit his job and joined a firm that helps rig operator BP develop an opposing strategy. On Nov. 15, Halliburton asked U.S. District Judge Carl Barbier to disqualify engineer Michael Viator, CSI Technologies, and CSI owner Fred Sabins as experts for BP. "HESI recently learned that Viator, after switching sides, revealed confidential information to Sabins and CSI as they assisted BP in formulating its claims and defenses against HESI," Donald Godwin of Dallas wrote.