Stress-Induced Fracturing of Reservoir Rocks: Acoustic Monitoring and μCT Image Analysis

Pradhan, Srutarshi; Stroisz, Anna; Fjær, Erling; Stenebråten, Jørn; Lund, Halvor; Sønstebø, E.F.

doi:10.1007/s00603-015-0853-4

Cited by 39 publications

(11 citation statements)

References 6 publications

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“…Does the elastic energy variation show similar peaks before the catastrophic failure point? Can we measure and analyze the elastic energy during a rock-fracturing test [17] in terms of the applied strain?…”

Section: Discussionmentioning

confidence: 99%

Variation of Elastic Energy Shows Reliable Signal of Upcoming Catastrophic Failure

2019

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We consider the Equal-Load-Sharing Fiber Bundle Model as a model for composite materials under stress and derive elastic energy and damage energy as a function of strain. With gradual increase of stress (or strain) the bundle approaches a catastrophic failure point where the elastic energy is always larger than the damage energy. We observe that elastic energy has a maximum that appears after the catastrophic failure point is passed, i.e., in the unstable phase of the system. However, the slope of elastic energy vs. strain curve has a maximum which always appears before the catastrophic failure point and therefore this can be used as a reliable signal of upcoming catastrophic failure. We study this behavior analytically for power-law type and Weibull type distributions of fiber thresholds and compare the results with numerical simulations on a single bundle with large number of fibers.PACS numbers:

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Section: Discussionmentioning

confidence: 99%

Variation of Elastic Energy Shows Reliable Signal of Upcoming Catastrophic Failure

2019

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“…Remarkably, these exponents are quite universal and independent of details of material or modeling. For example, τ E is known to be 1.3 − 2.0 for many brittle materials like synthetic plaster [53], wood [54], fiberglass [55], cellular glass [56] and rocks [57]. For bone under compressive loading, it has recently been reported for porcine bone that τ E = 1.3 − 1.7 [58].…”

Section: Avalanche Size Distributionmentioning

confidence: 99%

Role of matrix behavior in compressive fracture of bovine cortical bone

2017

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In compressive fracture of dry plexiform bone, we examine the individual roles of overall mean porosity, the connectivity of the porosity network, and the elastic as well as the failure properties of the nonporous matrix, using a random spring network model (RSNM). Porosity network structure is shown to reduce the compressive strength by up to 30%. However, the load-bearing capacity increases with an increase in either of the matrix properties-the elastic modulus or the failure strain threshold. To validate the porosity-based RSNM model with available experimental data, bone-specific failure strain thresholds for the ideal matrix of similar elastic properties were estimated to be within 60% of each other. Further, we observe the avalanche size exponents to be independent of the bone-dependent parameters as well as the structure of the porosity network.

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“…Wanniarachchi et al [13] studied the influence of confining pressure and injection pressure on the permeability of hydraulically fractured specimens. Besides the sandstone, many other rock materials were also adopted to the hydraulic experimental tests, such as limestone [14,15], coal [16,17], shale [18][19][20][21][22], and granite [23][24][25][26][27][28]. Blanton et al [29] systematically studied the relationships between hydraulic propagating fractures and natural fractures using Devonian shale.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Fracturing Behaviors and Mechanical Properties of Cracks under Coupled Hydro-Mechanical Effects in Rock-like Specimens

Zhou

Zhao

et al. 2018

Water

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The artificial fracturing technique under coupled hydro-mechanical effects is widely used in many rock engineering. Therefore, the study on the fracturing behaviors and mechanical properties of hydro-mechanical coupled cracks is very crucial. In this study, a series of fracturing tests were conducted on the cylinder gypsum specimens with single pre-existing cracks using triaxial compression loading system. Water pressure was applied inside the pre-existing cracks and led to the specimen failure with external compression loading. A new type of cracks, namely horizontal coupled cracks (HCC), were found in some specimens. Macroscopic observations reveal that HCC, which were mainly caused by the hydraulic pressure, were different from any tensile wing cracks, shear secondary cracks, or shear anti-wing cracks. Subsequently, a microscopic study was performed using scanning electron microscope (SEM), the outcomes suggest that: (1) Shear fracturing zones (SFZ) and tensile fracturing zones (TFZ) under coupled hydro-mechanical effects displayed distinct characteristics on orientations, length, and independence of gypsum grains; and (2) the HCC were tensile cracks when they just initiated from outer tips of pre-existing cracks. While tensile stress made major contribution to the specimen failure during the whole fracturing processes, the HCC became tensile and shear mixed cracks when the specimen was about to fail.

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Stress-Induced Fracturing of Reservoir Rocks: Acoustic Monitoring and μCT Image Analysis

Cited by 39 publications

References 6 publications

Variation of Elastic Energy Shows Reliable Signal of Upcoming Catastrophic Failure

Variation of Elastic Energy Shows Reliable Signal of Upcoming Catastrophic Failure

Role of matrix behavior in compressive fracture of bovine cortical bone

Experimental Study on the Fracturing Behaviors and Mechanical Properties of Cracks under Coupled Hydro-Mechanical Effects in Rock-like Specimens

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