Two of the world’s top three oilfield service providers, Halliburton and Baker Hughes, reported on Wednesday consensus-beating profits for the second quarter, but both signaled softer demand for drilling on the North American market. Weaker North American performance was more than offset by stronger international businesses at both companies. Halliburton (NYSE: HAL) reported adjusted net income for the second quarter of $691 million, or $0.77 per diluted share, higher than the analyst consensus in The Wall Street Journal, which…