Novel Stabilizers for Casing Drilling Simplify BHA, Handling, and Cost
Bibliographic record
Abstract
Abstract A novel technique for building stabilizers and wear bands directly onto casing for drilling is replacing multiple machined integral stabilizers. This is achieved with spray metal technology and the resulting blades, ribs and bands are at least as wear resistant as steel. Multiple stabilizers can be built onto a single joint of Range 3 casing to create the desired BHA. The spray metal process is commonly used in other industries for corrosion and erosion protection using relatively thin layers. The novelty of this new process is that the wear metal can be built up, typically, to thicknesses of ¾" (19 mm) and in any desired shape. This is a new use of the spray metal process for casing drilling because it has already proved successful in protecting drill pipe tube from wear in Extended Reach wells and in highly abrasive formations. Laboratory and field test results indicate that the material is sufficiently robust to withstand normally anticipated downhole drilling forces and the open hole wear resistance testing indicates that it will deliver very satisfactory rotational and longitudinal resistance to abrasion. In one well drilled with casing the casing string was deliberately tripped at TD to inspect stabilizer integrity and to measure wear. Further laboratory work has been undertaken to compare the material's wear and frictional characteristics with plain tooljoint steel and some more commonly used wear resistant materials. Casing drilling hundreds of wells per year will benefit significantly from the economies of scale which this new process offers. A single joint of Range 3 casing with the necessary stabilizers formed directly upon it is utilized instead of multiple short integral blade stabilizers (IBS) and casing pup joints. Rig time and HSE exposure is reduced through simplifying the BHA and its associated make up procedure. The spray metal stabilizers also provide operators with a significant cost reduction from traditional IBSs.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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".