(Oil Spill Losers story updated for Halliburton, Schlumberger losses, and losses in all energy service stocks)NEW ORLEANS ( TheStreet) -- The rally in shares of BP and Transocean ( RIG) turned out to be as short-lived as optimistic reports on the success of BP's top kill method to contain the oil spill. While there were consecutive indications on Thursday and Friday that the top kill was showing some signs of effectiveness in slowing the oil spill, Thursday's early optimism clearly went too far, and both BP and Transocean shares were down close to 6% on Friday at midday. BP's midday Friday loss was more than twice the decline of any of the other integrated major oil companies. The Transocean decline on Friday was equal to the decline in stocks within the more volatile offshore drilling sector, where fears of the impact from President Obama's ban on offshore drilling, announced Thursday, exacted a toll on all the major players. Diamond Offshore Drilling ( DO), Rowan Companies ( RDC) and Pride International ( PDE) were down by as much as Transocean's 5% decline at midday Friday. Jeffries & Company said Friday that offshore drillers including Diamond Offshore, Transocean, Price and Rowan, as well as Noble ( NE) and ENSCO ( ESV), could see 5% to 15% profit dips in 2010 and 2011, as the Gulf of Mexico business opportunities wane. Noble and ENSCO were both also declining by as much as 4% at midday Friday. Companies involved in providing deepwater services to oil drillers and integrated oil giants were taking huge losses on Friday. Halliburton ( HAL), the deepwater engineer at the center of the failed effort to cement the BP oil well shut, was down close to 8% early on Friday afternoon. Oceaneering International ( OII) was leading losses among deepwater drilling servicers, down more than 10%. Superior Energy Services was down 8.5%, while Helix Energy Solutions ( HLX) was down more than 7%.
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