Viscous creep in room-dried unconsolidated Gulf of Mexico shale (I): Experimental results

Chang, Chandong; Zoback, Mark D.

doi:10.1016/j.petrol.2009.08.018

Cited by 85 publications

(33 citation statements)

References 15 publications

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“…Viscous stress relaxation is another mechanism that can explain S Hmax variation. Viscous creep is a time-dependent deformation even at a constant stress condition, typically controlled by clay content in clayrich sands and shale [Hagin and Zoback, 2004;Chang and Zoback, 2009]. Such a rheological behavior, on the other hand, can result in stress relaxation if strain rate is sufficiently slow [Sone and Zoback, 2014].…”

Section: Stress Profile In C0002mentioning

confidence: 99%

Present‐day stress states underneath the Kumano basin to 2 km below seafloor based on borehole wall failures at IODP site C0002, Nankai accretionary wedge

Chang

Song

2016

Geochem Geophys Geosyst

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We constrain the state of stress to 2 km below seafloor in the Nankai accretionary prism at the Integrated Ocean Drilling Program (IODP) site C0002F, southwest Japan, based on borehole wall failures and rock strengths. The logging‐while‐drilling resistivity images from 872.5 to 2005.5 m below seafloor show that drilling‐mud control in riser drilling worked properly to minimize borehole wall failures. Available breakouts indicate a consistent maximum compression orientation subparallel to the subducting plate margin. Breakout analysis with drill logs suggests that breakouts occurred only when borehole pressure was slightly lowered and time lag between hole cutting and image logging was several hours. This indicates that the observed breakouts are not immediate stress‐induced failure but brought up into shape gradually with time due to other mechanisms. Laboratory investigations on deformation and failure of the cores suggest that the time‐delayed breakout might be a result of progressive rock spall‐out in borehole wall damage zones that occur at a stress level close to failure condition. We constrain stress magnitudes assuming that the stress state is sufficient to bring about the damage zones at the borehole wall. An integrated method utilizing breakouts, drilling‐induced tensile fractures, and a leak‐off test suggests that the stress states are on the boundary between strike‐slip faulting and normal faulting stress regimes, and somewhat variable depending on depth. The stress magnitudes in the accretionary wedge appear to be controlled by frictional strength of the rock, such that the differential stresses are constrained by the laboratory determined frictional coefficients.

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Section: Stress Profile In C0002mentioning

confidence: 99%

Present‐day stress states underneath the Kumano basin to 2 km below seafloor based on borehole wall failures at IODP site C0002, Nankai accretionary wedge

Chang

Song

2016

Geochem Geophys Geosyst

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“…The viscoelastic property of shale rocks was quantitatively investigated by many researchers over the past decades, such as the work of Schatz et al, 1981, Remvik, 1995, Chang et al, 2009. Viscoelasticity can be visualized via two distinct phenomena which are creep deformation and stress relaxation.…”

Section: Rocks Viscoelastic Propertymentioning

confidence: 99%

Viscoelastic Creep of Eagle Ford Shale: Investigating Fluid-Shale Interaction

Almasoodi

Abousleiman

Hoang

2014

Day 3 Thu, October 02, 2014

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Although organic-rich shale formations are being extensively produced in many places in the United States, the unexpected early production decline is still not fully understood. This phenomenon could have many physical or operational reasons. One of the physical attributes is the time-dependent characteristics of the shale mineral assemblage when interacting with the fracturing fluid. Creep deformation is one of those time-dependent characteristics through which rocks exhibit continuous deformation under constant load that affects reservoir completion and hydraulic fracture stimulation. In this study, shale creep deformation was characterized and rheological models were developed. Triaxial creep experiments were conducted on rock samples from the Eagle Ford shale from southern Texas. Samples were tested with water, decane, or without any circulating fluid to assess fluid-shale interaction. Eagle Ford shale mineral compositions were also investigated using X-Ray Diffraction analyses in an attempt to correlate minerals fluid sensitivity. Problems such as loss of fracture width and length due to shale viscoelastic behavior while embedding the proppant can be better understood if the magnitude of shale creep is well characterized. The experimentally calibrated viscoelastic model not only addressed the instantaneous, transient, and long term sample deformations, but also enabled the estimation of proppant embedment depth during production. The creep deformation was most pronounced when the shale was impregnated with water. Decane-impregnated samples produced less creep deformation and the least creep was measured on the dry ones. The theory of linear viscoelasticity was used to model the samples timedependent deformation when subjected to their respective constant loads.

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“…This delay in the surface settlement—that may range from a few months to a few years—can be only partially explained by the delayed pressure propagation into low‐permeable interlayers. Hence, a more complex mechanical behavior for deep aquifer and reservoir rocks must be considered, where the rate‐dependent viscous effects must be taken into account . Indeed, this paper focuses on presenting a 3D rate‐dependent model for reservoir geomechanical simulations, investigating and evaluating how a viscous material may affect the final results in terms of vertical surface displacements.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, a more complex mechanical behavior for deep aquifer and reservoir rocks must be considered, where the rate-dependent viscous effects must be taken into account. [11][12][13][14] Indeed, this paper focuses on presenting a 3D rate-dependent model for reservoir geomechanical simulations, investigating and evaluating how a viscous material may affect the final results in terms of vertical surface displacements.…”

Section: Introductionmentioning

confidence: 99%

Robust numerical implementation of a 3D rate‐dependent model for reservoir geomechanical simulations

Isotton¹,

Teatini

Ferronato

et al. 2019

Num Anal Meth Geomechanics

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Summary A 3D elasto‐plastic rate‐dependent model for rock mechanics is formulated and implemented into a Finite Element (FE) numerical code. The model is based on the approach proposed by Vermeer and Neher (A soft soil model that accounts for creep. In: Proceedings of the International Symposium “Beyond 2000 in Computational Geotechnics,” pages 249‐261, 1999). An original strain‐driven algorithm with an Inexact Newton iterative scheme is used to compute the state variables for a given strain increment.The model is validated against laboratory measurements, checked on a simplified test case, and used to simulate land subsidence due to groundwater and hydrocarbon production. The numerical results prove computationally effective and robust, thus allowing for the use of the model on real complex geological settings.

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Viscous creep in room-dried unconsolidated Gulf of Mexico shale (I): Experimental results

Cited by 85 publications

References 15 publications

Present‐day stress states underneath the Kumano basin to 2 km below seafloor based on borehole wall failures at IODP site C0002, Nankai accretionary wedge

Present‐day stress states underneath the Kumano basin to 2 km below seafloor based on borehole wall failures at IODP site C0002, Nankai accretionary wedge

Viscoelastic Creep of Eagle Ford Shale: Investigating Fluid-Shale Interaction

Robust numerical implementation of a 3D rate‐dependent model for reservoir geomechanical simulations

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