First Field Application of 2-7/8" Scale Removal Tool for Offshore Well Abandonment
Bibliographic record
Abstract
Abstract In June 2010, as part of an operation in a producing well, offshore eastern Canada, a junk basket on wireline tagged its depth and became stuck. The bottomhole assembly (BHA) was disconnected and left in the well. When the wireline was back at surface, scale was determined to be the reason for getting stuck. This became more evident after an attempt was made to bait the fish, which was unsuccessful because loose scale had settled on top of the disconnected tool. A run was made with a lead impression block (LIB) to understand better the fish neck, but it returned with no impression. Previously, in 2005, naturally occurring radioactive material (NORM) was detected in this well, having been observed on logging tools returned back to surface. Similarly, a few years later, NORM scale concerns appeared in another producing well on the platform. Due to the inability to handle large amounts of NORM (mostly loose scale) on surface, no intervention work to date had been performed on this platform. The proposed solution was to perform a scale removal operation using coiled tubing (CT). Initially, a pilot hole was drilled with a motor and mill, but the main focus was the use of a 2 7/8-in. scale-removal tool that employed jetted beads. For optimal pump rates and suspension capabilities, a specific gelled fluid system was recommended. A shaker system was sourced to remove and contain solid cuttings on surface and to recycle the gelled fluid on surface by using two large fluid containment tanks. The operation was completed successfully and without any issues or concerns. Client was able to recover the slot for future sidetrack drilling, which is a priority on a fixed platform.
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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 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| 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".