Fake Sand. They make this to stuff down oil wells. Makes the oil come out.

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[–]maxpower 12 insightful - 3 fun12 insightful - 2 fun13 insightful - 3 fun -  (1 child)

This is called a proppant. It's generally a man-made ceramic. Basically when fraccing, the pressure is greatly increased within the reservoir or coal seam which generates cracks. This proppant is part of the pressuring fluids and is forced in. When the pressuring is completed the proppant holds the cracks open and increased porosity/permeability of the formation enables production.

[–]Tiwaking 4 insightful - 2 fun4 insightful - 1 fun5 insightful - 2 fun -  (0 children)

That was really informative! Thanks maxpower!