Determination of stabilization time during stress-sensitivity tests
Notice bibliographique
Résumé
Previous studies proved that rock properties such as permeability, porosity, and well-logging properties can be changed when effective pressure increases (Labuz and Biolzi, 2016; Xiao et al., 2016; Dou et al., 2016; Miah et al., 2020; Han et al., 2021). The damage degree of permeability during such process is usually referred to as stress sensitivity. Stabilization time can be used to quantify the delayed stress sensitivity phenomenon. It characterizes how much time is required for a given core to reach an unchanging permeability level when the confining pressure is changed from a lower pressure to a higher pressure. However, few studies explore the mechanisms behind the observation that it takes an extra-long time for a low-permeability core to reach an unchanging permeability level when the confining pressure is changed from a lower pressure to a higher pressure. Most of stress sensitivity tests are terminated before reaching the stabilization stage, which leads to an underestimation of the actual permeability damages. In this study, we make a hypothesis that the delayed stress sensitivity can be correlated with the pore-scale properties of the reservoir rocks. In this study, mercury intrusion porosimetry (MIP) tests and tri-axial stress-sensitivity tests have been conducted on twelve core samples. MIP tests are used to measure the pore size distributions and to estimate the pore structure property. Using a trial-and-error approach, we develop an empirical method to split the pores in a given core sample into large pores and small pores based on the pore size distribution charts. Here we divide the pores into large and small pores. Our study find that the delayed stress sensitivity is strongly correlated with the pore structure of core samples. Once the pores are split into large pore and small pores, we can further calculate the area ratio of the large pores to the small pores. During each tri-axial stress-sensitivity test, we monitor the variation of permeability versus time. By analyzing the permeability variation data, we can determine the stabilization time, i.e., the time required for the permeability to reach a constant value when confining pressure changes to a higher level. We also record the cumulative stabilization time as a function of the confining pressure. The experimental results indicate that a core sample with a larger area ratio of large pores to small pores has a shorter stabilization time, while a core sample with a smaller area ratio of large pores to small pores has a longer stabilization time. Based on the experimental results, we develop a novel empirical model that can be used to predict the stabilization time required during the stress-sensitivity tests of a given rock sample.
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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 | 0,000 | 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 ».