A New Precipitation Squeeze Alternative for Treating Harsh Barium Sulphate Scaling in a Highly Naturally Fractured North Sea Carbonate Reservoir
Bibliographic record
Abstract
Abstract Harsh barium sulphate scaling downhole presents a significant squeeze treatment challenge, particularly with providing and then maintaining scale inhibitor residual concentration for extended period at and above the high MIC demand. The control situation worsens considerably when faced with such a scenario in a high temperature, naturally fractured carbonate well. Conventional dispersive type squeezes have found favour here, however their placement and subsequent rapid return at high concentration can result in low squeeze lifetime, mainly due to poor retention of the inhibitor type. The paper details a solution to the inhibitor retention and high MIC demand challenges via development of a novel precipitation squeeze formulation which utilises the dispersive type scale inhibitor as its primary active. The phase-separating ‘precipitation squeeze’ inhibitor formulation is designed to be deployed via conventional bullheaded squeeze into a high temperature, naturally fractured carbonate well environment. The material will thermally activate causing phase separation and enhanced retention of the inhibitor as its calcium salt. Since the active inhibitor is highly tolerant to calcium, it will return into solution with greater facility than conventional precipitation squeeze analogues, leading to elevated levels of scale inhibitor in solution for extended periods compared to standard chemistries in the same carbonate environment. Simulated carbonate field coreflood tests indicated a 3-4 time squeeze lifetime extension was achievable using this technology, and formation damage assessments indicate no identifiable damage to the core material or fluid throughput. The material is now developed for bulk manufacture and is now in the field awaiting first pilot squeeze deployment at the time of writing this abstract. This novel alternative squeeze treatment shows significant increase in achievable squeeze lifetime compared to existing scale inhibitor chemistries for squeeze deployment in harsh barium sulphate scaling carbonate field deployments. Benefits are logistical, environmental and economic when deploying this technology.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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".