2017
DOI: 10.1007/s00603-017-1295-y
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Abstract: The economic production of gas and oil from shales requires repeated hydraulic fracturing operations to stimulate these tight reservoir rocks. Besides simple depletion, the often observed decay of production rate with time may arise from creep-induced fracture closure.We examined experimentally the creep behavior of an immature carbonate-rich Posidonia shale, subjected to constant stress conditions at temperatures between 50° and 200°C and confining pressures of 50 to 200 MPa, simulating elevated in-situ depth… Show more

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Cited by 84 publications
(65 citation statements)
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“…We tested this representation and found that power laws with n < 0.07 provided a satisfactory fit to our data and were consistent with the exponent values of n < 0.04 obtained by Hasbani and Hryb (2018) for Vaca Muerta shale samples in the oil window. Power law exponents lower than 0.1 have generally been reported for a wide range of shales (Hasbani & Hryb, 2018;Rassouli & Zoback, 2016;Rassouli & Zoback, 2018;Rybacki et al, 2017;Sone & Zoback, 2014), suggesting that these creep data could also be satisfactorily fitted using the log time model (indeed, logarithmic and power law models yield nearly identical strain rate decays, 1/t and 1/t 1-n , respectively, if and only if the exponent n is very small). Here, we found the log time description more convenient than power law because it allowed us to use the creep modulus concept developed for nanoindentation creep experiments (Vandamme & Ulm, 2013).…”
Section: 1029/2019jb017524mentioning
confidence: 84%
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“…We tested this representation and found that power laws with n < 0.07 provided a satisfactory fit to our data and were consistent with the exponent values of n < 0.04 obtained by Hasbani and Hryb (2018) for Vaca Muerta shale samples in the oil window. Power law exponents lower than 0.1 have generally been reported for a wide range of shales (Hasbani & Hryb, 2018;Rassouli & Zoback, 2016;Rassouli & Zoback, 2018;Rybacki et al, 2017;Sone & Zoback, 2014), suggesting that these creep data could also be satisfactorily fitted using the log time model (indeed, logarithmic and power law models yield nearly identical strain rate decays, 1/t and 1/t 1-n , respectively, if and only if the exponent n is very small). Here, we found the log time description more convenient than power law because it allowed us to use the creep modulus concept developed for nanoindentation creep experiments (Vandamme & Ulm, 2013).…”
Section: 1029/2019jb017524mentioning
confidence: 84%
“…Transient creep strain in shales has been described in some studies as increasing with the logarithm of time (Chang & Zoback, ; Ghassemi & Suarez‐Rivera, ), while, in others, the combined transient and secondary creep regimes were modeled as a single power law in time (with power n < 0.1; Hasbani & Hryb, ; Rassouli & Zoback, ; Rassouli & Zoback, ; Rybacki et al, ; Sone & Zoback, , ). Transient creep can also be interpreted using the Burgers (Ghassemi & Suarez‐Rivera, ; Li & Ghassemi, ) or modified standard linear (Almasoodi et al, ) viscoelastic models.…”
Section: Introductionmentioning
confidence: 99%
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