Emergency Chemical Scavenging of Hydrogen Sulfide During Gulf of Mexico Well Flowback
Notice bibliographique
Résumé
Abstract During an initial Drillship flowback of a newly completed subsea GoM well, the produced fluids were found to contain unexpected and significant concentrations of hydrogen sulfide (H2S). Despite no detectable levels of H2S in the native reservoir fluids produced from nearby wells in the same sand zone, the flowback separator gas-phase consistently showed H2S concentrations in excess of 100 ppm. It is believed that the souring was caused by irregularities during the completion phase, and the flowback was suspended indefinitely until the serious HS&E concerns could be addressed. Collaboration between the operator and the chemical partner resulted in appropriate operating procedures and chemical selection to allow the well to flowback through existing infrastructure. To mitigate the presence of sour fluids in the carbon steel subsea flowline and topsides plant, the chemical partner was able to prove through laboratory testing that a liquid-phase subsea H2S Scavenger application would prove highly effective. To deliver the chemistry, the scavenger was injected topsides (25 ppm scavenger to 1 ppm gas-phase H2S) into a continuous dead oil circulation that would be used mix with the sour fluids at the wellhead and provide a turbulent flow regime for mixing. This stage of the procedure was preceded by a 500-gallon oil-soluble corrosion inhibitor pill delivered between two pigs to protect the infield flowline from any acid gas induced corrosion. Once well flowback was re-initiated with the treated dead oil circulation, the chemistry was observed to be highly effective at scavenging H2S in the subsea flowline. Draeger tubes and inline gas meters showed no detectable levels of gas-phase H2S during continuous scavenger treatment. To confirm success of the chemical treatment, injection was temporarily ceased and H2S levels were once again detected and began to climb. The value delivered by the relatively small amount of scavenger chemical was tremendous, as the chemical partner was able to help the operator prevent multi-million dollars in workover expenses. Though not immediately quantifiable, the mitigation of topsides HS&E concerns was equally as valuable since the souring was neutralized prior to boarding.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,001 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».