H-4.2, r. 1 - Regulation respecting petroleum exploration, production and storage in a body of water

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SCHEDULE 3
CLASSIFICATION OF A WELL’S RISK POTENTIAL
During the classification of a well’s risk potential, if a well meets the criteria of the various levels of risks, the highest risk must take precedence.
Classification of the wellsType of wellGeologyStatus before the temporary closure
Low riskGas well
˂ 28,000 m3/day
Non-problematic geological formationsNon-problematic well
Oil well without flow and without H2SWell whose pressures are controlled
Tube well with a content in H2S ˂ 5%, non-perforated
Moderate riskGas well
≥ 28,000 m3/day
Problematic geological formations
(example: karsts)
Problems documented and not controlled (example: communication between adjacent wells)
Oil well without flow and with a content in 
H2S ≥ 5%
Oil well with flow
Injection well
High riskWell containing gas with a content
in H2S ≥ 5%
Not applicableNot applicable
Sour gas well
1251-2018O.C. 1251-2018, Sch. 3.
SCHEDULE 3
CLASSIFICATION OF A WELL’S RISK POTENTIAL
During the classification of a well’s risk potential, if a well meets the criteria of the various levels of risks, the highest risk must take precedence.
Classification of the wellsType of wellGeologyStatus before the temporary closure
Low riskGas well
˂ 28,000 m3/day
Non-problematic geological formationsNon-problematic well
Oil well without flow and without H2SWell whose pressures are controlled
Tube well with a content in H2S ˂ 5%, non-perforated
Moderate riskGas well
≥ 28,000 m3/day
Problematic geological formations
(example: karsts)
Problems documented and not controlled (example: communication between adjacent wells)
Oil well without flow and with a content in 
H2S ≥ 5%
Oil well with flow
Injection well
High riskWell containing gas with a content
in H2S ≥ 5%
Not applicableNot applicable
Sour gas well
1251-2018O.C. 1251-2018, Sch. 3.