An Integrated Practical Approach to Forecasting Multi-well SAGD Production using Analog, Analytical, and Numerical Modeling Techniques
Bibliographic record
Abstract
Abstract There are many challenges in making rigorous economic decisions for capital intensive SAGD projects. Among those challenges is the need for reliable production forecasts. The traditional forecasting techniques of analogy, numerical simulation, and analytical methods are each burdened with their own drawbacks. The resulting production forecasts can vary to such a degree that the validity of the results obtained from each approach is questionable. When used in isolation, the individual forecasting techniques yield a significantly different result from each other, making economic decisions an imposing task. This paper presents an integrated ternary approach which draws on the strengths of each methodology. A database of 70 SAGD well pairs from Suncor's MacKay River property is used to obtain analogs. It captures the variations in reservoir quality, reservoir thickness, and well design. In addition, an internally developed Monte-Carlo analytical tool, based on fundamental physics (i.e. material/energy balance, gravity drainage theory), is used to generate a probabilistic range of oil and SOR forecasts. This tool utilizes statistical distributions of static and time- dependent variables. Finally, numerical simulation models are also generated in conjunction with Suncor's geostatistical modeling process. The simulation input parameters are obtained through validation of multi-well simulation models against a long period of historical field data in MacKay River project area. The integration of these methodologies is presented in detail in this paper. This integrated approach provides a basis for comparing relevant SAGD performance indicators, such as oil rate and SOR. The results generated from the integrated approach have served to increase confidence in the robustness of the associated business decisions.
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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 | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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".