Found Unit 27 listed for Exxon in Nac County. Will dig further for Unit 21 but verifies that Exxon is in that county and close to those Unit numbers.
LEASE NAME : TRAWICK GAS UNIT 27 OPERATOR NUMBER : 257128 OPERATOR NAME : EXXON MOBIL CORPORATION FIELD NAME : TRAWICK (PETTIT-TP CONS.) WELL NUMBER : 104 WELL ROOT KEY : 00608068 WELL TYPE NAME : PRODUCING OFF SCH FLAG : N UPPER PERF : 7438 LOWER PERF : 8838 API NUMBER : 34733134