Establishing Operating Envelops for Material Susceptibility to Environmentally Assisted Cracking in Thermal Oil Sands Operation
Bibliographic record
Abstract
Abstract The defined environmental and material limits specified in ANSI/NACE MR0175/IS015156:2009 restrict the use of austenitic stainless steel alloys under sour conditions typically encountered in thermal in-situ oil sand operations. In this study, C-ring testing was conducted to evaluate the susceptibility of an austenitic stainless steel to conditions that simulate a severe downhole environment; i.e., 230 °C, a pH of 3.5, and variable chloride concentrations and H2S partial pressures. The results indicated that after 720 hours of exposure, the material did not show any cracking when tested at 10,000 ppm Cl- and 1,000 kPa H2S, and at 50,000 ppm Cl- and 100 kPa H2S; conditions well outside of the environmental limitation imposed by ANSI/NACE MR0175/IS015156:2009. Cracking was observed on the specimens when the chloride concentration was increased to 30,000 ppm at 1,000 kPa H2S, and at 10,000 ppm chloride when the partial pressure of H2S was increased to 3,000 kPa. Increasing the partial pressure of H2S tended to produce deeper cracks in the specimens, while increasing the chloride content increased the number of cracks on the specimens. Increasing the chloride concentration was linked to higher corrosion rates in the specimens due to its scale destabilizing effects.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 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) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".