Definitions and Notes
CLASS II Wells
Class II wells are wells that have been drilled or converted for use in secondary
or enhanced recovery operations. These "secondary recovery input" wells are
generally water or inert gas (CO2) injection wells. Specifically, the definition
and operation of Class II wells falls under the regulatory jurisdiction of
the United States EPA Region 4 Office in Atlanta, GA.
Development wells are wells drilled to recover resources within a known producing
area to a known producing zone. By rule of thumb, development wells may be
drilled up to 0.5 miles away from existing producing areas.
Exploratory wells are wells drilled to find new producing zones or to extend
an area of known production. Exploratory wells include New Pool or Field
Wildcats, Deeper or Shallower Pool Tests, and Extension (or Outpost) wells.
By rule of thumb, wildcat wells are drilled more than 1 mile from known producing
areas and extension wells are from 0.5 to 1 mile from known producing areas.
FORMATION AT TD
Number reported in these columns represent the number of wells whose deepest
penetration (the total depth) tested strata of the specified age (i.e.,
Pennsylvanian strata, etc.).
Wells reported as "O&G" have been completed as combined oil and gas producers
according to the Well Log and Completion Report filed by the operator of
In Kentucky, a permit to drill, re-open, or deepen an oil or gas well is
in effect for one year after the date of issue. The permit may be cancelled
at any time during that year prior to initiating drilling operations at the
request of the operator. The permit may also be allowed to expire at the
end of the year (again without initiating drilling operations). Both
of these actions result in the "termination" of the permit.