Classification used to report annual drilling statistics to American Petroleum Institute. Data have not been systematically entered in the PDMS for wells completed prior to 2001.
dry hole inside field outline, deeper target than existing pay
dry hole within existing field, and drilled to same pay as in field
dry hole within existing field and within about 3 locations (~ 2000 feet) of a producing well;
dry hole between the existing field outline and 1 mile from the field, greater than 3 locations (~ 2000 feet) from a producing well
dry hole between field outline and 1/2 mile from outline, less than 1/2 mile from production
dry hole greater than 1 mile from field
dry hole inside field outline, shallower target than field pay
productive well outside field outline, less than 1/2 mile from same pay
stratigraphic tests, waste disposal wells, potable water supply wells, Survey drill holes, coal borings, engineering, and other non-petroleum tests
productive well greater than 1 mile from existing field
productive well inside field outline, new pay for field;
productive well greater than 3 locations (~ 2000 feet) from existing well that produces from same pay, may be outside the field outline
productive well, greater than 1 mile from nearest production, within field limits, same pay;
productive well, greater than 1/2 mile from nearest production, outside field limits but less than 1/2 mile from nearest production in same pay
productive well less than 1 mile from nearest production, within field limits, deeper pay
salt water disposal wells, non-potable water supply wells, water injection (flood) wells
productive well greater than 1 mile from nearest production, within field limits, shallower pay
productive well within existing field outline and within about 3 locations (~ 2000 feet) from existing well producing from same pay