Experimental Investigation of CO<sub>2</sub>‐ and Fe<sub>3</sub>O<sub>4</sub>‐Assisted Corrosion at the Cement–Casing Interface
Bibliographic record
Abstract
In this study, CO 2 ‐ and Fe 3 O 4 ‐assisted corrosion of the cement–casing interface for the magnetite (Fe 3 O 4 ) high‐density cement–casing steel system in simulated formation water is investigated under the normal and high CO 2 pressure conditions. Results show that the degradation of the cement–casing interface is affected by the competition of cement hydration and CO 2 corrosion. The migration of CO 2 and corrosive species to the cement–casing interface is facilitated under the high pressure condition, resulting in enhanced corrosion rate as compared to the normal pressure condition. The casing steel is in active corrosion state while the corrosion rate gradually increases with time. After long term of immersion, a layer of thick corrosion products with multiple cracks/microgaps forms at the cement–casing interface, which can hardly protect the casing steel from further corrosion. The corrosion products on the steel surface are mainly FeCO 3 accompanied by a small amount of CaCO 3 and Fe 3 O 4 , suggesting the prevalence of CO 2 corrosion. The mechanism of the CO 2 ‐ and Fe 3 O 4 ‐facilitated corrosion of the cement–casing interface for the magnetite high‐density cement–casing system is proposed.
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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 | 0.001 | 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 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| 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".