Numerical Study of High Pressure Injection in Unconsolidated Reservoirs
Bibliographic record
Abstract
Numerous hydrocarbon-related injection operations are carried out in weakly-consolidated reservoirs. Strong flow-stress coupling, large non-linear deformations, and fracturing/opening are typical during these operations, specifically surrounding the injection wellbore. Geomechanical processes involved in high pressure injection in weakly-consolidated media are not well understood. The objective of this paper is to study the coupled behavior of these reservoirs at injection pressures below hydraulic fracturing, but sufficiently high to induce a zone of plastic deformations around the wellbore. A coupled, axisymmetric, poro-elasto-plastic, numerical model was developed in this study to simulate injection in unconsolidated formations. A detailed stress-strain-pore pressure evaluation was performed throughout the transient period of injection cycle, transient period of post-injection, and at steady state. Pressures were compared against the theoretical equation commonly applied at field and in analytical/numerical studies.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| 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".