Tribological behaviors of quartz sand particles for hydraulic fracturing

Yang, Liu; Wang, Deguo; Guo, Yanbao; Liu, Shuhai

doi:10.1016/j.triboint.2016.06.017

Cited by 40 publications

(23 citation statements)

References 30 publications

(37 reference statements)

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“…At a normal load of 1 N, it is assumed that the damage of the surface roughness might be less pronounced, which would explain the very similar shapes of the tangential force-displacement plots which were independent to the cycle number as well as the less pronounced effect of the number of shearing cycle on the interparticle coefficient of friction. At a greater normal load of 7 or 10 N, the absence of a peak state might be explained by the possible plowing effects [9], which resulted in an increase of the inter-particle Figure 17. The effect of the shearing cycles on the inter-particle friction ratio of LBS grains.…”

Section: Tangential Load-displacement and Friction For The Lbs Grainsmentioning

confidence: 99%

“…At a greater normal load of 7 or 10 N, the absence of a peak state might be explained by the possible plowing effects [9], which resulted in an increase of the inter-particle coefficient of friction when the shearing test was repeated. As reported by Yang et al [9], plowing effects might result because of the shearing process. It is believed that further systematic study is necessary investigating and quantifying the shearing track and the surface roughness of the grains accounting for the role of the magnitude of the applied normal load as well as how the surface damage is affected by the number of shearing cycles.…”

Section: Tangential Load-displacement and Friction For The Lbs Grainsmentioning

confidence: 99%

“…From the first works published in 1960s and 1970s, for example by Horn and Deere [1] or Procter and Barton [2], to recent studies by Cole et al [3], Cavarretta et al [4], Senetakis et al [5][6][7] or Nardelli et al [8] some discrepancies with respect to the measured friction at the interface of geological materials have been noticed. Previous works had a particular focus on the development of laboratory apparatus quantifying the frictional response at the interface of geological materials, for example the studies by Cavarretta [4] or Yang et al [9]. However, the inter-particle stiffness could not be captured in laboratory tests until the recent works by Cole et al [3] and Senetakis et al [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Other applications may be found in petroleum engineering technologies and the energy sector [9,17], deep ground engineering and geothermal engineering [18] as well as understanding energy dissipation mechanisms and damping in soils [19,20] or understanding the mechanisms and modeling stability problems in geotechnical engineering, for example related to landslides [21]. Overall, the understanding of surface properties, processes, interactions and contact mechanics of geological interfaces may be considered as a fundamental step in a variety of problems and applications in geomechanics which are beyond the soil mechanics applications.…”

Section: Introductionmentioning

confidence: 99%

“…One type consisted of quartz sand grains which are typical materials used as fracturing proppant [9]. The second type consisted of a geo-material taken from a landslide which is closer to applications related to debris flows.…”

Section: Introductionmentioning

confidence: 99%

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Exploring the Micromechanical Sliding Behavior of Typical Quartz Grains and Completely Decomposed Volcanic Granules Subjected to Repeating Shearing

Sandeep

Senetakis

2017

Energies

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Abstract:The micromechanical behavior at grain contacts subjected to tangential and normal forces is of major importance in geotechnical engineering research and practice. The development of the discrete element method (DEM) over the past three decades necessitated a more systematic study on the experimental grain contact behavior of real soil grains as DEM simulations use as input tangential and normal load-displacement relationships at grain contacts. In this study, experimental results conducted at the City University of Hong Kong are presented exploring the tangential load-displacement behavior of geological materials. The focus of the study is to explore the possible effect of repeating the shearing test to the same grains on the inter-particle coefficient of friction accounting for the level of the applied normal load. Additionally, the study reports on the frictional behavior of different geological materials including quartz sand grains, denoted as Leighton Buzzard sand (LBS) in the study and completely decomposed volcanic granules denoted as CDV. Quartz grains may find applications as proppant in petroleum engineering, whilst the CDV granules consisted of a material taken from a recent landslide in Hong Kong, whose applications are related to debris flow. Through the micromechanical sliding experiments, the inter-particle coefficient of friction was quantified following shearing paths of about 60 to 200 microns. While at the smallest vertical load of 1 N, there was not observed a notable effect of the repeating shearing for the LBS grains, it was noticed that for small to medium vertical loads, between 2 and 5 N, the repeating shearing reduced the friction at the contacts of the LBS grains. This trend was clear between the first and second shearing, but additional cycles did not further alter the frictional response. However, at greater vertical loads, between 7 and 10 N, the results showed a continuous increase in the dynamic inter-particle friction for the LBS grains with repeating shearing. It was also noticed that at 7 and 10 N of vertical load, there was absence of a peak state in the tangential force-displacement plot, whereas a peak state was observed at smaller loads particularly for the first shearing cycle. These observations might be explained by the possible plowing effects at greater vertical loads which resulted in an increase of the inter-particle coefficient of friction when the shearing test was repeated. For the CDV granules, only the first shearing cycle gave a peak state and, in general, the effect of repeating the shearing was small but with an increase of the inter-particle friction from the first to the second cycle. Overall, during the repeating shearing the LBS grains had a dynamic inter-particle coefficient of friction that ranged between about 0.18 and 0.38, but the CDV granules exhibited much greater friction with values that corresponded to the steady state sliding that ranged between 0.54 and 0.66 . The observed trends in the study might be due to mechanisms that take place...

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Section: Tangential Load-displacement and Friction For The Lbs Grainsmentioning

confidence: 99%

Section: Tangential Load-displacement and Friction For The Lbs Grainsmentioning

confidence: 99%