Stimulation of High-Temperature Sandstone Wells in Steam Drive and SAGD Areas
Notice bibliographique
Résumé
Abstract Steam drive and SAGD (Steam Assisted Gravity Drainage) are common methods of producing heavy oil in many areas of the world. Feedstock water is taken from a local water source, converted to steam and pumped down an injector well. The steam heats the fluids in the formation reducing the native bitumen viscosity allowing it to flow to a nearby producing well. This process has the potential to produce several damage scenarios including carbonate and/or silicate scales, asphaltene deposition or formation fines migration. A procedure has been developed to remove formation damage and provide matrix stimulation in the shallow, extremely high BHT (200°C), sandstone wells in producing Steam Drive and SAGD wells. The producer's wells covered in this paper are located in the heavy oil region of Bolney, which is northeast of Lloydminster, Alberta, Canada. In many cases, the horizontal section of the producing wells are completed using slotted liners consisting of alternating blank and slotted sections. The slotted liner helps prevent sand production and maintain wellbore integrity while still allowing fluid inflow to occur. In addition to the original liners, most of the Bolney producers had additional screens put inside the liners that provided a smaller slot size. This was done to help with fine sand production problems the field experienced after initial completion. This completion configuration presents challenges in stimulating the ‘behind’ pipe formation which also includes the space between the slotted liner and open hole and the near wellbore region. The acid treatment involves various pre-flush fluids and a unique retarded hydrofluoric acid system that results in the slow release of hydrofluoric acid in the formation to yield deep penetration into high temperature sandstone reservoirs. Not only is the reaction with fines and clays retarded, the retardation chemistry stabilize reaction products in spent acid to help control precipitation damage. Over a time period of five years, information from various analyses was obtained which confirmed some of the damage mechanisms that can be present in the producing wells. Two particular wells, which are presented in detail, have been treated on three occasions over these five years and on each treatment, a different volume of stimulation fluid and a separate application technique has been utilized. Each treatment produced a markedly different production profile. The production increase can be correlated to the treatment type and volume of fluid used. Presented in this paper is the evolution of the process where multiple wells where stimulated utilizing various treatment types and volumes and the resulting production analyzed to optimize the process.
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Scores du classifieur distillé par catégorie (deux têtes)
| 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) | 0,002 | 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
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