Interfacial Films of Diluted Heavy Oil–Aqueous Systems at Elevated Temperatures and Pressures: Effect of Reverse Emulsion Breakers
Bibliographic record
Abstract
Steam-assisted gravity drainage (SAGD) is one of the unconventional methods used in Canada to extract heavy oil; however, a stable water-in-oil-in-water (W/O/W) emulsion is generated during production. The emulsion is then pumped into a high-temperature separator, after adding a diluent, a reverse emulsion breaker (REB), and an emulsion breaker (EB) to separate the oil and water and comply with the sales oil specifications. This work is focused on understanding the demulsification processes under high-temperature (80–120 °C) and high-pressure (700–900 kPa) conditions. Compressibility, crumpling film or drop detachment ratios, and interfacial tension (IFT) were used to evaluate the demulsifiers. REBs were found to decrease IFT and cause the interfacial film to be reversible. These effects showed a dependency with the temperature, and their magnitude varied with the chemistry of the REB. Effective REBs formed complexes with natural anionic surfactants present in the oil phase, weakening the irreversible film, which correlated well with lowering emulsion stability. When EB was added to the system, a synergistic effect was observed by further lowering the IFT. All of these results demonstrated that the compressibility and IFT techniques employed in this study provide valuable insights into the mechanisms of demulsification of SAGD emulsions.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".