Coiled-Tubing Fracturing on Slant-Well Operations
Bibliographic record
Abstract
Abstract The unconventional shallow gas market is the fastest growing oil and gas sector in Western Canada. Although these gas reserves are enormous, the economic output of a single well is marginal. The low production rate of each well has forced operators to reduce costs wherever possible. The largest expense in the completion of a well is stimulation. The advent of the coiled tubing fracturing method has reduced these costs substantially, as all zones can be individually isolated and stimulated in one operation. Operators are taking further action by drilling multiple slanted wells from a single surface location. This configuration requires only one lease, one access road and reduces production costs with a single pipeline collection point. Workover equipment with the ability to rig onto these wellheads safely is in short supply. Many shallow gas wells utilize threaded wellheads that are not designed to support sideloads. Coiled tubing equipment is relatively massive, and previous attempts to ‘block up’ the wellhead and blowout preventers (BOPs) have resulted in near-tragic consequences. To overcome these obstacles, a patented support system capable of safe and efficient rig-up of BOPs on slanted wellheads was designed and built. The support system can be rigged onto wellhead angles ranging from 30-95 degrees. The system can manipulate the BOPs in virtually all planes to allow for flexibility when positioning onto a wellhead. The weight of the BOPs and CT equipment are then buttressed by the support system, and not the wellhead. The development of this system has enabled safe coiled tubing fracturing within the economic and technical contraints of shallow gas and coalbed methane type fields.
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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 | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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".