(June 2, 2020, 7:04 PM EDT) -- TULSA, Okla. — An oil well services company on May 28 sued a hydraulic fracturing operator in Oklahoma federal court contending that it breached the agreement between the parties by failing to pay for services rendered at multiple fracking well sites (Key Energy LLC, et al. v. Ram Energy LLC, No. 20-236, N.D. Okla.)....