HOUSTON (Reuters) - Oil prices will need to rise further for energy companies to significantly expand drilling activities, according to a survey released on Thursday by the Federal Reserve Bank of Dallas.

But prices above $60 a barrel are needed to see a significant uptick in activity, according to the survey, which questioned 134 firms headquartered in Texas, southern New Mexico and northern Louisiana.

West Texas Intermediate (WTI) crude was trading at about $59.50 on Thursday, down slightly from a 2-1/2-year high of $60.01 earlier this week.

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