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Development and Validation of an Integrated Numerical Tool for Scaling Control and Squeeze Treatment Optimization

Funded under: FP5-EAECTP C


The main objective of ARISSTON project was to develop and validate an integrated numerical tool that should assist essentially in the design and optimization of squeeze treatments for the prevention of scaling. The formation of mineral scales from produced water/brines in oil/gas wells and pipelines constitutes an old but persistent problem for the oil industry. Lost production, formation damage and operational expenses caused by scale deposits cost hundreds of million US$ every year. The tool predicts the timing of scale deposition, the consequent formation damage distribution and the effects associated with the placement and flow of inhibitors in the near well formation. The validation of the tool and methodology involved both laboratory and field scale activities. Their application will greatly contribute towards the reduction of lost production and operational costs since the tool provides the chance for optimal design of the squeeze treatment (selection of inhibitor, inhibitor concentration, size of the pill, etc.) and for in-time placement of inhibitors at the zones where scaling is expected. Such optimization is important in both vertical and horizontal wells, although its impact is more pronounced in the second case, where significant quantities of inhibitors are wasted with the traditional methods of squeeze treatment due to the large length of the well and the unsymmetrical scale distribution.
The ARISSTON project has been based on the following innovative features: The development of an integrated simulation tool that consists of the following autonomous modules:
- the single well model, which simulates the three phase flow in the formation around the wellbore,
- the geochemical model,
- the permeability and porosity distribution model,
- the inhibitor flow model.

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