Mealey's (June 18, 2015, 10:55 AM EDT) -- PITTSBURGH — A hydraulic fracturing company sued by an oil and gas field services company for failing to pay for services performed at a well site field a brief on April 15, arguing that the petition should be denied for violations of the Federal Rules of Civil Procedure (ULC Oil and Gas Field Services v. EXCO Resources Pa LLC, No. 14-00072, W.D. Pa.)....