Low pressure well
Low pressure well means a well that satisfies at least one of the following conditions:
(1) The static pressure at the wellhead following fracturing but prior to the onset of flowback is less than the flow line pressure;
(2) The pressure of flowback fluid immediately before it enters the flow line, as determined under § 60.5432a, is less than the flow line pressure; or
(3) Flowback of the fracture fluids will not occur without the use of artificial lift equipment.
40 CFR § 60.5430a
As used in this subpart, all terms not defined herein shall have the meaning given them in the Act, in subpart A or subpart VVa of part 60; and the following terms shall have the specific meanings given them.