The Remediation of Oilfield Asphaltenic Deposits: Near-Well-Bore Application
Notice bibliographique
Résumé
Abstract Asphaltene deposition in petroleum production can cause major economic and safety issues for operators. The most commonly applied solution for remediation is a prolonged solvent soak with an aromatic petroleum solvent, such as toluene or xylene. In many cases, these solvents have demonstrated a low dissolving efficiency, and a high frequency of soaks is needed, resulting in unacceptable levels of deferred production. Nalco Champion has undertaken product development research to provide an appropriate chemical solution. The work presented here describes the technology and techniques used to design chemical product packages and are applicable to both onshore and deepwater production environments. Measurement of the overall solubility parameters of the chemical - deposit interactions, and their implications for product design will be discussed. The ability of the chemical to penetrate and break up the deposit matrix will also be described, as this is a significant factor for solvating efficacy. Finally, a proof-of-concept case history showing success in remediating near-wellbore asphaltene deposits will be presented. A remediation "pill" containing three separate chemistries was designed for an early-life Anadarko Gulf of Mexico subsea well experiencing asphaltene deposition issues in the lower tubing and near-wellbore region. The three chemistries composing the pill (products A, B, and C) were shown to act synergistically in laboratory studies and were highly effective in remediating field asphaltene deposition relative to pure aromatic solvent. The different make-up chemistries of the pill were targeted primarily to near-wellbore asphaltene deposition, and succeeded in increasing near-wellbore permeability. To deliver the chemistry to the affected area, the pill was deployed topsides between two steel pigs and displaced through the subsea flow loop using dead oil into the desired well. The pill volume was large enough to allow for bullheading though the affected downhole area and approximately five radial feet into the near-wellbore region. A thirty six hour static soak was then used to allow effective penetration and dissolution of the asphaltene deposit. Multiple ensuing crude flowback samples were tested for constituent chemical residuals, as well as for asphaltene content. Post-treatment well test data showed an immediate increase in the well productivity index (PI) from 0.73 to 3.8. Oil production also increased from 1,600 STB/d to 2,900 STB/d. The positive increase in production lasted just over three months before asphaltene re-accumulation began to decrease the PI. A second identical treatment was conducted 10 months later with even better results. The benefit of this novel remediation approach relative to traditional xylene soaks was highly apparent based on historical field data. Not only did it show a much greater asphaltene solvency and further increased oil rates, but it allowed for less frequent remediation events and deferred production.
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 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 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 ».