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76 FR 64623, Oct. 18, 2011, unless otherwise noted.
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Nomenclature changes to part 550 appear at 90 FR 24071, June 6, 2025.
(a) You must determine whether each reservoir is sensitive. You must classify the reservoir as sensitive if:
(1) Under initial conditions it is an oil reservoir with an associated gas cap;
(2) At any time there are near-critical fluids; or
(3) The reservoir is undergoing enhanced recovery.
(b) For the purposes of this subpart, near-critical fluids are:
(1) Those fluids that occur in high temperature, high-pressure reservoirs where it is not possible to define the liquid-gas contact; or
(2) Fluids in reservoirs that are near bubble point or dew point conditions.
(c) The Regional Supervisor may reclassify a reservoir when available information warrants reclassification.
(d) If available information indicates that a reservoir previously classified as non-sensitive is now sensitive, you must submit a request to the Regional Supervisor to reclassify the reservoir. You must include supporting information, as listed in the table in § 550.1167, with your request.
(e) If information indicates that a reservoir previously classified as sensitive is now non-sensitive, you may submit a request to the Regional Supervisor to reclassify the reservoir. You must include supporting information, as listed in the table in § 550.1167, with your request.