CO2 sorption induced damage in coals in unconfined and confined stress states: A micrometer to core scale investigation

Pirzada, Muhammad Asad; Zoorabadi, Mahdi; Ramandi, Hamed Lamei; Canbulat, Ismet; Roshan, Hamid

doi:10.1016/j.coal.2018.09.009

Cited by 43 publications

(16 citation statements)

References 39 publications

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“…X-ray computed tomography and image analysis X-ray computed tomography is a non-destructive scanning technique which can map the internal structure of the rock sample with high resolution (Viggiani et al 2004;Ji et al 2012;Baud et al 2015;Pirzada et al 2018;Viggiani and Tengattini 2019). The technique has been used to get insights into material instabilities (Sheppard et al 2014) such as observation of the parallel compaction bands in carbonate (Baxevanis et al 2006;Arzilli et al 2016) or to obtain localized 3D strain maps (Lenoir et al 2007;Tudisco et al 2015;Papazoglou et al 2017;McBeck et al 2018;Renard et al 2019).…”

Section: Experimental Set-upmentioning

confidence: 99%

The dynamic evolution of compaction bands in highly porous carbonates: the role of local heterogeneity for nucleation and propagation

Xiao

Roshan

et al. 2020

Prog Earth Planet Sci

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The formation of compaction bands in porous brittle rocks such as sandstones and carbonates has a significant impact on the localization mechanisms preceding earth and planetary surface instabilities such as earthquakes, landslides, and plate boundary faults. The micromechanics underpinning the dynamics of the formation of compaction bands and its effect on alteration of pore fluid pathways are not yet fully understood. The current study seeks to understand the mechanical properties of compaction in highly porous carbonate at micro-and macro-scale using time-lapse triaxial experiments in an X-ray transparent flow and deformation cell. Images were obtained with increasing axial strain levels using X-ray computed tomography allowing mapping of the evolution of internal structures. In addition to the X-ray analysis, digital image correlation (DIC) was used to quantify the evolution of strain and precisely identify the nucleation mechanism of compaction bands and its dynamics. The effect of friction on the boundary platens was shown to be minimal as evidenced by shear strain obtained from DIC analysis. This comprehensive analysis allowed assessment of the role of heterogeneity for the initiation of compaction bands. Local regions with high porosity provide the initial seeds for discrete compaction followed by the nucleation of traveling waves that lead to diffuse growth of the compaction zone. This interesting phenomenon is expected to be a fundamental mode of compressional deformation in porous brittle media where discrete, often periodic, deformation bands are observed on compaction.

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Section: Experimental Set-upmentioning

confidence: 99%

The dynamic evolution of compaction bands in highly porous carbonates: the role of local heterogeneity for nucleation and propagation

Xiao

Roshan

et al. 2020

Prog Earth Planet Sci

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“…It was observed from the microstructural images that due to WAG injection the lignite has experienced swelling and imbibition, and also, CO 2 retention occurred. It was reported that CO 2 sorption and swelling can cause coal core structural change and damage (Pirzada et al 2018). It can be seen from the Fig.…”

Section: Injectivity Decline and Co 2 Retentionmentioning

confidence: 82%

Permeability Damage and Supercritical Fluid Storage in the Cauvery Basin Neyveli Lignite Bed Containing Kaolinite Deposits during Alternative Injection of Brine and CO2

Rajkumar

Antony

Mahalingam³

et al. 2020

Preprint

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A laboratory based investigation has been conducted on permeability damage and CO2 storage or retention in the lignite core during alternative injection of brine and supercritical carbon dioxide. Moreover, anthracite and bituminous coal beds were focused by the scientific community for effective production and reservoir formation damage study. But, now-a-days, lignite based coal bed methane reservoirs have attracted attention for productive exploitation and formation collapse investigation. Hence, for this purpose, a single component injection two phase (Brine + Supercritical CO2) coreflood test analysis under alternative injections were performed to investigate the occurrence of lignite structural collapse, permeability damage, injectivity decline and CO2 retention as well. The experimental study reveals that, due to gravity segregation there is a high rate of fluid saturation in lignite core and also, moderate level of heat transfer coefficient was also noted. Also, lignite core structural collapse under the brine and supercritical CO2 injection at different velocities resulted in huge volume of coal and kaolinite fines concentration. Kaolinite and coal fines migration resulted in pressure change and permeability decline in lignite core. The suspensions produced were passed to microstructural analysis and it revealed that kaolinite fine particle tends to possess a leaflet geometrical structure, which obstructed the cleats and restricted the fluid flow. Subsequently, hysteresis modelling (Pranesh 2018) was applied to this problem to quantify the amount of CO2 retention in lignite core. Additionally, statistical model, multiple linear regression was applied to this problem to validate the experimental model, which showed good agreement.

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“…10 Differences in the failure characteristics of the coal in different directions led to the anisotropy of the gas permeability of the fissured coal .11,12 In addition, when the CO 2 was injected into the coal seams and gas was quickly emitted, the strain of the coal caused by adsorption would lead to coal damage and permeability change. [13][14][15][16] Similarly, the damage and failure of tectonic coal, remolded coal, and coal-rock complex also led to the changes in coal gas permeability . [17][18][19] In order to describe the change law of the coal seam permeability, the relationship between macroscopic mechanical properties (such as deviation stress, effective stress, and fracture volume) and the permeability of damaged coal was established based on test data .…”

Section: Introductionmentioning

confidence: 99%

Investigation of the evolution of damage and permeability of coal containing gas based on acoustic emission characteristics

Liu

Zhou

2020

Asia-Pacific J Chem Eng

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The gas permeability of a coal seam was the main factor determining the efficiency of gas extraction from the mines and was closely related to the coal damages. In this paper, a triaxial compression failure test of the raw coal was carried out in the gas seepage state using the MTS 815 rock mechanics testing system. The damage evolution law of the coal containing gas under triaxial compression was studied based on acoustic emission characteristics. The damage evolution parameters were determined using acoustic emission signals, and the relationship between the permeability and damage evolution of the coal containing gas was quantitatively analyzed. The results demonstrated that the acoustic emission signals could reflect the development of the damage and failure inside the coal, and the turning point of the acoustic emission characteristic curve marked different damage development stages. The periodic changes in the permeability of the coal samples were consistent with the damage change law, and some lag existed in permeability changes compared with damage evolution. The permeability of the coal containing gas saw a stepwise exponential growth with the damage development. The piecewise exponential function better reflected the relationship between the gas permeability and damage variables.

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CO2 sorption induced damage in coals in unconfined and confined stress states: A micrometer to core scale investigation

Cited by 43 publications

References 39 publications

The dynamic evolution of compaction bands in highly porous carbonates: the role of local heterogeneity for nucleation and propagation

The dynamic evolution of compaction bands in highly porous carbonates: the role of local heterogeneity for nucleation and propagation

Permeability Damage and Supercritical Fluid Storage in the Cauvery Basin Neyveli Lignite Bed Containing Kaolinite Deposits during Alternative Injection of Brine and CO2

Investigation of the evolution of damage and permeability of coal containing gas based on acoustic emission characteristics

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