Experimental Investigation on the Influence of High Pressure and High Temperature on the Mechanical Properties of Deep Reservoir Rocks

Zhang, Peng; Mishra, Brijes; Heasley, K.A.

doi:10.1007/s00603-015-0718-x

Cited by 66 publications

(17 citation statements)

References 27 publications

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“…However, the apparent viscosity of gel fracturing fluid obtained using KPS/ABS microcapsules as the gel reduced relatively slowly, and the apparent viscosity was maintained above 50 mP·s for 100 min at 70 °C [Figure (c)] and reduced to 7 mP·s after 160 min. This was very beneficial for high‐temperature fracturing construction …”

Section: Resultsmentioning

confidence: 99%

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Encapsulation of potassium persulfate with ABS via coacervation for delaying the viscosity loss of fracturing fluid

Meng

Wang

et al. 2019

J of Applied Polymer Sci

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Encapsulation of persulfates is an important and effective method for sustained release to delay the gel breaking of a fracturing fluid in a high‐temperature reservoir. For a gel breaker with sustained release performance, the coacervation of Acrylonitrile‐Butadiene‐Styrene (ABS) induced by polydimethylsiloxane (PDMS) was conducted to encapsulate potassium persulfate (KPS). Moreover, the composition, KPS loading, morphology, structure, release property, and gel‐breaking performance of the obtained microcapsules were investigated thoroughly. The results show that KPS was successfully encapsulated by the ABS, and the KPS/ABS microcapsules consisted of micron‐sized particles with a porous surface, core/shell structure, and significant sustained release property that were affected by the core/shell mass ratio during the preparation. Moreover, the apparent viscosity of gel fracturing fluid at 70 °C obtained using the KPS/ABS microcapsules as the gel breaker could be maintained above 50 mPa·s for 100 min. Therefore, the encapsulation of KPS by the coacervation of ABS is a feasible method to achieve sustained release property, and it could effectively reduce the rate of viscosity loss of fracturing fluid at a high temperature. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47734.

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Section: Resultsmentioning

confidence: 99%

“…This was very beneficial for high-temperature fracturing construction. 7,[37][38][39] With the increase in temperature, the apparent viscosity of gel fracturing fluid decreases (Figure 7). The apparent viscosity was maintained above 50 mPÁs for 74 min at 75 C [ Figure 7(c)], but it was only 7 min at 80 C [ Figure 7(d)].…”

Section: Release Property Testsmentioning

confidence: 99%

Encapsulation of potassium persulfate with ABS via coacervation for delaying the viscosity loss of fracturing fluid

Meng

Wang

et al. 2019

J of Applied Polymer Sci

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“…Many efforts have been devoted to the relationship between rock axial peak stress and confining pressure, with a number of strength criteria proposed. Among them, the linear Mohr–Coulomb strength criterion is extensively used in practical projects (Zhang et al 2015a , b ; Yang et al 2011 ; Li et al 2015a , b ) because it has a simple expression and can reflect the essence of shear failure for materials. The linear Mohr–Coulomb strength criterion can be expressed as where σ 1c is the axial peak stress, σ 3 is the confining pressure, σ 0 is usually regarded as the uniaxial compression strength of rock sample, and k is a material constant.…”

Section: Results and Analysesmentioning

confidence: 99%

“…The results revealed that rock failure is caused by axial splitting under uniaxial compression; as the confining pressure increases, rock failure occurs in a few localized shear planes and the rock mechanical behavior is changed from brittle to ductile. To study the mechanical strength and deformation of sandstone, Zhang et al ( 2015a , b ) performed a series of mechanical tests on sandstone samples. They showed that there is a clear transition from volumetric compressibility to dilatancy and a strong dependency on confining pressure.…”

Section: Introductionmentioning

confidence: 99%

“…The results indicated that the pore pressure, under low confining stress, undergoes a transition from increase to decrease due to the evolution of volumetric strain from contraction to dilatation and this transition gradually disappears under high confining stress. In order to investigate deep reservoir rock properties in High Pressure and High Temperature environments, triaxial tests were performed on Carthage marble and Crab Orchard sandstone samples by Zhang et al ( 2015a , b ). It was found that with the increase of confining pressure, the Carthage marble changes from strain-softening to strain-hardening, and the Crab Orchard sandstone exhibits brittle or strain-softening behavior; at high temperature, tensile cracks and axial splitting are observed on both rocks; strength of the two rock types is directly dependent on confining pressure and inversely related to temperature.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation and constitutive model for lime mudstone

et al. 2016

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In order to investigate the mechanical properties of lime mudstone, conventional triaxial compression tests under different confining pressures (0, 5, 15 and 20 MPa) are performed on lime mudstone samples. The test results show that, from the overall perspective of variation law, the axial peak stress, axial peak strain and elastic modulus of lime mudstone tend to gradually increase with increasing confining pressure. In the range of tested confining pressure, the variations in axial peak stress and elastic modulus with confining pressure can be described with linear functions; while the variation in axial peak strain with confining pressure can be reflected with a power function. To describe the axial stress–strain behavior in failure process of lime mudstone, a new constitutive model is proposed, with the model characteristics analyzed and the parameter determination method put forward. Compared with Wang’ model, only one parameter n is added to the new model. The comparison of predicted curves from the model and test data indicates that the new model can preferably simulate the strain softening property of lime mudstone and the axial stress–strain response in rock failure process.

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Elastoplastic augmented virtual internal bond modeling for rock: A fracture‐plasticity combined constitutive model

Wei

Zhao

Cheng

et al. 2023

Num Anal Meth Geomechanics

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In the ultra-deep reservoir or other deep-buried subsurface engineering, the in situ stress is high enough to make the rock transition from the brittle to the plastic. In such situation, the fracturing process always goes with the plastic deformation together. Therefore, to develop an elastoplastic constitutive model which can simultaneously account for both fracture and plastic deformation is critically important. In this paper, an elastoplastic augmented virtual internal bond (EP-AVIB) model is developed. In EP-AVIB, a hyperelastic AVIB is developed to characterize the elastic deformation of rock, in which the micro bond is linear elastic in compression whereas is hyperelastic in tension. The Drucker-Prager yield criterion is employed to characterize the plastic deformation. Thus, the EP-AVIB can combine the fracture and plastic deformation together. The simulation examples show that the EP-AVIB can simulate the elastoplastic mechanical behaviors and the fracturing process of rock subjected to compression. It provides a simple approach to the elastoplastic failure simulation of rock. Its perspective in deep reservoir and deep-buried subsurface engineering simulation should be inspiring.

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Experimental Investigation on the Influence of High Pressure and High Temperature on the Mechanical Properties of Deep Reservoir Rocks

Cited by 66 publications

References 27 publications

Encapsulation of potassium persulfate with ABS via coacervation for delaying the viscosity loss of fracturing fluid

Encapsulation of potassium persulfate with ABS via coacervation for delaying the viscosity loss of fracturing fluid

Experimental investigation and constitutive model for lime mudstone

Elastoplastic augmented virtual internal bond modeling for rock: A fracture‐plasticity combined constitutive model

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