UPDATE 1-Patterson-UTI, Helmerich & Payne gain on buoyant demand for hi-tech rigs
April 23, 2015 at 07:23 AM EDT
April 23 (Reuters) - Oil drilling contractors Patterson-UTI Energy Inc and Helmerich & Payne Inc reported higher-than-expected quarterly profits as demand for their hi-tech rigs remained resilient despite the slump in crude prices.
