Are the Non-conventional Reservoir Well's Fracked Just One Time During its Shelf Life?

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I think that proppants do not keep the fractures open over time because the oil flow itself weakens and degrades the sand along with overburden pressure.

I have not found, however, evidence both of this fact and technical papers regarding this issue. 

Please share any information including case studies and papers on this topic.

Much appreciated.

 

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