646 wells completed. In existing fields, 107 oil and 450 gas wells were completed. Exploratory drilling included 12 new gas field discoveries, 4 new gas pool discoveries, 3 deeper pool discoveries, 1 shallower pool discovery, and 36 extensions to existing gas fields. Oil production was 848,969 bbl and gas production 19,000 mmcf. Drilling for Medina Sandstone gas production and Devonian black shale gas.--Modified journal abstract.