Study on Casing Stability under Non-Uniform Ground Stress for In-Situ Leaching Well Of One Uranium
Bibliographic record
Abstract
One in-situ leaching sandstone uranium deposit is located in the southern margin of Ili basin in northern Tianshan area.In order to study the effect of in-situ stress in deep ground on casing stability in long-term in-situ leaching operation process, we estimate the in-situ stress character in the mine based on the pie core and scan images of borehole TV, combining with the measured in-situ stress nearby.The results show that the direction of the maximum horizontal principal stress in the mine is NNE16°, the magnitude of it is about 25.54 MPa.Within the scope of tested depth, the relationship among the magnitude of the principal stress is SH>SV>Sh, the range of SH/SV is 1.6-1.1,therange of Sh/SV is 1.1-0.8,which indicate that the horizontal stress dominate control the stress field in this area.Taking UPVC casing-cement sheath-stratum combined system as study target, the finite models were established for rearch on the pressure and deformation effect of different factors and mud creep.The relation on the casing deformation and non-uniformity was studied.Furthermore, the casing life in creep formation was estimated.The numerical simulation results shows that the non-uniform ground stress is the important cause of main casing damage.Meanwhile the mudstone creep will aggravate the non-uniformity of the ground stress.The larger the stress differential is, the easier the casing will be plastic damage.Under the condition of non-uniform stress, the plastic strain reaches 14% at a depth of 720 m for 8 years and close to the plastic strain of 15%.The casing is likely to be damaged or excessively deformed.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 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".