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- W2023148048 abstract "Abstract The concept of skin has been with us for a long time. Numerous different definitions exist but normally a skin is considered a dimensionless factor calculated to determine or explain deviation from a well’s ideal (or theoretical) behaviour. Skin is often considered to include the impact of formation damage or reduced near wellbore permeability and provides a convenient catch-all for any number of different phenomena that affect well performance. This concept, which avoids attempting to fully capture and understand system performance, would not be tolerated in other engineering industries. It is time to reconsider our use and abuse of skin and move to a more systematic and physically rigourous description of well performance and formation damage. When a well is drilled there are multiple factors that influence the well performance or the ability of fluid to flow in to or out of the well. The key factors are the reservoir properties and the geometry of the wellbore and how this geometry interacts with the reservoir. Rather than relating varied and diverse well geometries such as perforations, hydraulic fractures, chemically-induced fractures or channels, to a simple cylindrical base case well and calling the difference in well performance skin we can, and should, detail the well geometry. Too often the good or excellent well performance from stimulated wells is mis-attributed to a negative skin and no formation damage when the principal stimulation has been a significant change in the wellbore geometry. If the well geometry can be defined then we can evaluate how the well performance compares with expectation for that geometry without invoking skin. Using examples of real well performance and formation damage, a procedure is presented which demonstrates the advantages gained from understanding real wellbore geometry and the advances that extinction of skin factors brings to well planning and performance. Skin is an outdated and misleading concept and an expedient tool for justifying drilling and completion design and well performance. The challenges in modeling such a complex system should never be underestimated but it is clear that better well planning and better understanding of well productivity and formation damage will be possible if we include the well geometry in our assessment and eliminate skin." @default.
- W2023148048 created "2016-06-24" @default.
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- W2023148048 date "2012-02-15" @default.
- W2023148048 modified "2023-09-24" @default.
- W2023148048 title "The Extinction of Skin" @default.
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- W2023148048 doi "https://doi.org/10.2118/151807-ms" @default.
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