Key Takeaways ExxonMobil and Chevron reported much lower second-quarter profits as the price of oil slumped.Adjusted earnings for both oil giants beat estimates, but Chevron missed revenue forecasts.Chevron's results were impacted by a loss in the fair market price of shares of Hess,

Rather than jockeying for an advantage in their weakened state, the two longtime rivals are set to work together more and more.

Top U.S. oil producers Exxon Mobil and Chevron are expected to report their lowest earnings in four years when they release second-quarter results on Friday, as weaker oil and gas prices slashed revenue.