Using Burst Collars in a Liner String for Multi-zone Completions in Horizontal Wellbores: Case Study
Bibliographic record
Abstract
Abstract This paper introduces a new multi-zone completion technology (MZCT) to stimulate multiple stages in a horizontal wellbore that is either cased using external packers or cemented into place. In both scenarios, a liner assembly containing specialized collars with predrilled ports that are covered by burst disks is run into the horizontal section of a wellbore. There are no restrictions on the number of collars that can be run, nor the spacing between them. After the assembly is set, coiled tubing is used to complete each interval using a cup/cup assembly that straddles each specialized collar, and then pressures up to open the burst ports. The fracture is then initiated through the coil string into the reservoir, with the coiled tubing moving along the horizontal wellbore from the toe to the heel, the process being repeating against each specialized collar. Advantages of this new system include no limits to the number of stages that can be completed, full bore diameter available following the stimulations without the cost of milling out mechanical ports, and the ability to do re-completions on the same intervals at a later date. The liner with the burst collars can be used with packers or cemented in, additional collars can be run and stimulated at a later date, and the completion is more cost effective than current alternatives. This paper discusses the application of the cemented burst collars on the Viking formation in the Redwater field of Alberta and Plato field of SW Saskatchewan. Comparisons are made between the burst collar system and previous completion systems used in the Viking. Recognized benefits include reduced downtime during operations after a screen-out and tighter spacing between fracs in a cemented liner application as opposed to perforating.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| 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) | 0.002 | 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".