Working mechanism and rock-breaking performance study of new core drill bit with negative pressure absorption effect
Bibliographic record
Abstract
In order to improve the ROP (rate of penetration) of complex structure and deep wells and reduce the energy consumption of rock breaking during the drilling process, a core drill bit with negative pressure adsorption effect is developed. Rock-breaking energy consumption, ROP, negative pressure effect and rock carrying capacity of new drill bit are studied. Numerical example is conducted to analyze the relationship between the characteristic parameters of drill bit and cutting velocity and experimental tests are carried out to verify the theoretical model and the results of calculation examples. The calculation results indicate that with the increase in the cutting velocity, the axial and tangential forces and the ROP increase and the power consumption of drill bit decreases. The nozzle equivalent size of the new drill bit can be designed as 0.03 mm. According to the experimental results, as the flow rate of fluid increases, the power consumption of new drill bit decreases and the ROP increases. Compared with the conventional bit, the reduced ratio of power consumption of new drill bit is between 8% and 25%, and the ROP is increased by more than 45% in some sections, which show the rock breaking effect of new drill bit is better. The new drill bit can be used in the exploitation of oil and gas well drilling technology with new conditions, and also can provide technical support for improving rock breaking efficiency and ROP in the drilling process.
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 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".