HOUSTON--(BUSINESS WIRE)--Rock Hill Capital Group (Rock Hill) has announced its investment in Oklahoma City-based Park Energy Services, LLC (Park Energy). Park Energy was formed to acquire and operate a fleet of Sertco compressors servicing the domestic oil and natural gas production industry. Park Energy, through its predecessor company, High Sierra Sertco, LLC, has a unique supplier relationship with Sertco, a company with over 30 years of manufacturing experience and 15 years in the natural