کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
809347 | 1468682 | 2016 | 9 صفحه PDF | دانلود رایگان |
• We use XRCT and digital image correlation to monitor proppant pack deformation.
• The approach provides a non-invasive method to track sub-fracture-scale movement.
• Proppant movement was studied in a core of Marcellus shale loaded to 10,000 psi.
• The analysis captured a failure event in the proppant pack.
• The event coincided with the appearance of vortex-like grain motions.
In this paper, we describe a method to non-invasively study the movement of proppant packs at the sub-fracture scale by applying three-dimensional digital image correlation techniques to X-ray tomography data. Proppant movement is tracked in a fractured core of Marcellus shale placed under a series of increasing confining pressures up to 10,000 psi. The analysis reveals the sudden failure of a region of the proppant pack, accompanied by the large-scale rearrangement of grains across the entire fracture surface. The failure of the pack coincides with the appearance of vortex-like grain motions similar to features observed in biaxial compression of two dimensional granular assemblies
Journal: International Journal of Rock Mechanics and Mining Sciences - Volume 87, September 2016, Pages 39–47