May 27 (Bloomberg) -- U.S. stock-index futures gained as an advance in oil prices boosted energy shares, overshadowing predictions Wall Street banks will report more credit losses.

Schlumberger Ltd. and Halliburton Co., the world's biggest oilfield services providers, rose after analysts increased forecasts for the companies' stock prices. Lehman Brothers Holdings Inc., Goldman Sachs Group Inc. and Morgan Stanley declined after Bank of America Corp. said slowing economic growth and further asset writedowns may hurt profits. Qualcomm Inc. advanced after being added to Piper Jaffray's Cos. ``Alpha'' list.

Standard & Poor's 500 Index futures expiring in June climbed 2.3, or 0.2 percent, to 1,375.7 at 9:12 a.m. in New York. Dow Jones Industrial Average futures added 20 to 12,491 and Nasdaq- 100 Index futures increased 9 to 1,967.25.

To contact the reporter on this story: Henrietta Rumberger in Frankfurt at hrumberger@bloomberg.net; Elizabeth Stanton in New York at estanton@bloomberg.net

Last Updated: May 27, 2008 09:13 EDT