| CODE | Explanation |
|---|
| AB: | Well known to be abandoned but with no plugging information on file |
| AI: | Air injection |
| CBM: | Coalbed methane gas producer |
| COI: | Carbon dioxide injection |
| CP: | Cathodic protection |
| D&A: | Dry & abandoned |
| DEV: | Development well |
| DG: | Domestic gas |
| EPB: | Enhanced recovery polymer barrier |
| ERI: | Enhanced recovery injection (Class II) |
| EXT: | Extension (outpost) well |
| FF: | Fire flood |
| GAS: | Gas producer |
| GI: | Gas injection |
| GS: | Gas storage |
| IA: | Improperly abandoned |
| LOC: | Location (new permit issued or insufficient data) |
| MSC: | Miscellaneous well |
| N2I: | Nitrogen injection |
| NFW: | New field wildcat |
| NPW: | New pool wildcat |
| O&G: | Combined oil and gas producer |
| OB: | Observation |
| OIL: | Oil producer |
| SPT: | Shallower pool test |
| SI: | Steam injection |
| SRI: | Secondary recovery injection (Class II) |
| SRV: | Service well, EPA Class II injection |
| STRP: | Stratigraphic test with records released to the public |
| SWD: | Salt water disposal |
| TA: | Temporarily abandoned |
| TAI: | Thermal & air injection |
| TP: | Termination pending |
| TRI: | Tertiary recovery injection (Class II) |
| TRM: | Terminated (permit expired or cancelled) |
| UN: | Unknown (as classified by KY DOGC) |
| UNC: | Unclassified |
| WD: | Water disposal |
| WI: | Water injection |
| WS: | Water supply |
| WW: | Water well |
