23. Where a well poses a risk for the safety of persons and property, and for environmental protection, a licence holder must carry out corrective activities in compliance with Chapter X.
A well is considered as posing such a risk if any of the following situations is detected: (1) there is an emanation at the surface casing vent flow and that emanation has one of the following characteristics:
(a) its stabilized flow is equal to or greater than 50 m3 day;
(b) the emanation is not only composed of gas;
(c) it contains hydrogen sulfide (H2S) whose concentration is equal to or greater than 6 μg/m3 for 4 minutes;
(d) it is produced by a failure of a packer or casing;
(2) the stabilized closing pressure at the wellhead is equal to or greater than half the formation leak pressure measured at the elevation of the surface casing shoe or, if that elevation is unknown, at 11 kPa/m multiplied by the true vertical depth of the surface casing;
(3) there is a gas migration that represents a fire hazard or other risk to the safety of persons and property, and environmental protection.