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Erschienen in:
2017 | OriginalPaper | Buchkapitel
Borehole Strengthening in Gas Wells from Near Borehole Drying
verfasst von : Euripides Papamichos
Erschienen in: Bifurcation and Degradation of Geomaterials with Engineering Applications
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Abstract
The effect of flow-through drying in sand production is analyzed. In flow-through drying evaporation of the connate water of the reservoir sandstone occurs into the gas phase during natural gas production. The strength of sandstone is affected by the water saturation with dry rock being stronger than water saturated rock. Drying of the formation near the well due to gas flow will thus lead to an increase in the critical stresses for failure and sand production. Flow-through drying of a near wellbore formation is coupled with a constitutive model with water saturation dependent strength and stiffness to analyze the coupled problem of flow-through drying and mechanical behavior of a material. Results from finite element simulations are presented and compared with experimental results.