New fracture closure-stress calculation leads to improved proppant selection

04/05/2010
A proposed calculation of in situ closure stress allows engineers to select more appropriate proppant.For decades, the calculation for in situ closure stress on proppant has involved subtracting flowing bottomhole pressure (FBHP or estimated FBHP) from minimum horizontal stress. Using these results, engineers have selected proppant based on its tested and published strength to withstand being crushed severely or completely.But this traditional calculation leads to an incorrect and low closure-stress value.The author believes that in situ closure stress on the proppant in the fracture should never be less than the closure pressure or minimum horizontal stress of the formation (determined a...
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