Chaparral Energy, Inc. reported production results for the fourth quarter and full year of 2018. For the year, the increased year-end 2018 proved reserves to 94.8 million barrels of oil equivalent (MMBoe), up 35% when adjusting for 2018 divestitures. STACK proved reserves were increased to 73.7 MMBoe, up approximately 49% as it replaced 519% of estimated 2018 production. About 21.7 thousand barrels of oil equivalent per day (MBoe/d) were produced for the fourth quarter of 2018, growing STACK production to an estimated 16.6 MBoe/d in the period, up 60% year-on-year.