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EPA based its finding on tests at the Methane Emissions Technology Evaluation Center at Colorado State University from February to April 2024. Each source released 0.08 to 6.71 kg/hr of methane in tests of 0.3 to 8 hours. EPA's reviewers found that SOOFIE reached a 90% probability of detection at about 0.6 kg/hr, below the reference limit of 5 kg/hr. On 23 September 2025, EPA approved it for periodic screening at the 5, 10 and 15 kg/hr thresholds. The system locates emissions only to the whole facility. SLB's reanalysis left out events with wind outside the system's operating range. SLB has deployed the devices in 12 US basins and abroad. 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Approval letter for the SLB SOOFIE emissions monitoring system as Methane Alternative Test Method MATM-013, with the Acceptance Justification memorandum, 23 September 2025 (docket EPA-HQ-OAR-2024-0619).","title":"Approval letter and Acceptance Justification: SLB SOOFIE emissions monitoring system (Methane Alternative Test Method)","url":"https://www.epa.gov/system/files/documents/2025-09/slb-soofie-approval-letter-and-justification-memo.pdf","date":"2025-09-23","written_by":"independent","quote":"A 90% POD threshold was identified at approximately 0.6 kg/hr, which is below the reference detection limit of 5 kg/hr."}]}},"provenance":{"kind":"legacy_record","basis":"Editorial assignment.","record_fields":["evidence"],"source_refs":[]},"review_state":"record_mapped","coverage":"partial"},"sources[].upstream_sources":{"state":"unresolved","provenance":{"kind":"curatorial","basis":"Editorial assignment.","record_fields":[],"source_refs":[]},"reason":"This is an explicit unresolved assignment: the sources on record do not settle this question.","review_state":"not_assessed","coverage":"partial"},"strategic_assessments[]":{"state":"unresolved","review_state":"not_assessed","coverage":"partial","family":"strategic assessments"},"summary":{"state":"value_present","value":{"kind":"record_fields","fields":{"summary":"EPA found that SLB's SOOFIE network, which uses an AI-based algorithm to detect methane events, reached 90% probability of detection at about 0.6 kg/hr in controlled tests.","account":"SLB's SOOFIE system uses at least three methane sensors placed around an oil and gas facility. A proprietary AI-based algorithm sorts the readings into emission events. Emission rates then come from a hybrid model that combines machine learning with a Gaussian plume framework. After SLB acquired ChampionX, it refiled ChampionX's application of March 2025 in August 2025. EPA based its finding on tests at the Methane Emissions Technology Evaluation Center at Colorado State University from February to April 2024. Each source released 0.08 to 6.71 kg/hr of methane in tests of 0.3 to 8 hours. EPA's reviewers found that SOOFIE reached a 90% probability of detection at about 0.6 kg/hr, below the reference limit of 5 kg/hr. On 23 September 2025, EPA approved it for periodic screening at the 5, 10 and 15 kg/hr thresholds. The system locates emissions only to the whole facility. SLB's reanalysis left out events with wind outside the system's operating range. SLB has deployed the devices in 12 US basins and abroad. 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