A Saskatchewan Field Trial to Better Understand Downhole Dynamics of PCP Systems
Bibliographic record
Abstract
Abstract This paper presents the results of a field trial conducted in Saskatchewan, Canada to investigate drive string dynamics between conventional and continuous rod and the impact of interference fit between rotor and stator in progressing cavity pumps (PCP). In August 2009, a well was completed with a downhole monitoring system and a PCP driven by a continuous rod string. At the same time, a second well was completed with a downhole monitoring system and a PCP driven by a conventional rod string. The pumps were identical with the exception of the interference fit of the rotor in the elastomeric stator. Thousands of data values were collected over a period of several months and evaluated to better understand rod stretch, torsion, and axial movement during start-up, shut-down and normal operating conditions and how these values change as a function of the interference fit of the pump itself. While the data evaluation did provide answers to help ConocoPhillips improve their PCP operations, there were even more questions generated that will prove thought-provoking to the industry and stir some great discussion.
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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 | 0.003 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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".