Numerical simulations of triaxial compression tests of cemented sandstone

Rakhimzhanova, Aigerim; Thornton, Colin; Minh, Nguyen Hop; Fok, S.C.; Zhao, Yong

doi:10.1016/j.compgeo.2019.04.013

Cited by 20 publications

(13 citation statements)

References 25 publications

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“…Material properties of reservoir equivalent sandstone the Ustyurt-Buzachi Sedimentary Basin samples were reproduced for the numerical experiments. We have extended the previous research on 3D bond contact model of cemented sandstone material to the numerical simulations of CPT tests and the identified bond strength values to be used for verified with experimental results by Rakhimzhanova et al (2019) were used for the simulations of CPT test. The results show that with increase in bond strength the cone resistance and side friction decrease, while the friction ratio increase; the cone resistance and side friction increase with increase in penetration depths.…”

Section: Resultsmentioning

confidence: 99%

Numerical simulations of cone penetration tests in cemented sandstone

Rakhimzhanova¹,

Thornton²,

Zhao³

2019

Preprint

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In this study, three-dimensional simulations of cone penetration tests (CPT) in cemented sandstone have been carried out using the Discrete Element Method (DEM). The particle size distribution of the sandstone analogue samples from the Ustyurt-Buzachi Sedimentary Basin was replicated with the numerical samples. Numbers of numerical CPT tests at different bond strength values were performed with the penetrometer vertically moved down at a constant rate. The results of the real-world particle size distribution show that the cone penetration resistance and sleeve friction increase with increasing depths; and with increase in bond strength the cone resistance and side friction decrease, while the friction ratio increases. The result of numerical CPT tests in cemented sandstone was found to be in good agreement with the Soil Behaviour Type (SBT) classification system from CPT data.

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Section: Resultsmentioning

confidence: 99%

Numerical simulations of cone penetration tests in cemented sandstone

Rakhimzhanova¹,

Thornton²,

Zhao³

2019

Preprint

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“…The main aim of this study is to investigate threedimensional DEM simulations of cone penetration tests in weakly cemented sandstone using the real-world particle size distribution and periodic boundaries and to examine the effect of cementation bond strength. This research applies the recent development of a simple 3D bond contact model for cemented sandstone material [12][13]. Further, interpretation of obtained realistic cone…”

Section: Introductionmentioning

confidence: 94%

Numerical simulations of cone penetration in cemented sandstone

2021

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In this study, three-dimensional simulations of cone penetration tests (CPT) in cemented sandstone have been investigated using the Discrete Element Method (DEM). We generated the realistic grain size distribution of sandstone in the numerical simulations using the Ustyurt-Buzachi Sedimentary Basin samples. Numbers of numerical CPT tests at different bond strength values were performed with the penetrometer vertically moved down at a constant rate. The results of the real-world particle size distribution show that the cone penetration resistance and side friction increase with increasing depths; and with increase in bond strength the cone resistance and side friction decrease, while the friction ratio increases. The result of numerical CPT tests in cemented sandstone was found to be in good agreement with the Soil Behaviour Type (SBT) classification system from CPT data.

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“…All the DEM sand particles are considered to be elastic and frictional, where the particle-LSO (Large-Sized Objects) and particle-particle contact forces without adhesion are calculated using the theories of Hertz (1881) to determine the normal force, and Mindlin (1949) to calculate the tangential force. A simple 3D bond contact model for cemented sandstone material developed by Rakhimzhanova et al (2018Rakhimzhanova et al ( , 2019a) was used to calculate the interparticle normal contact force with adhesion, where authors simply modified the previous existing JKR model for auto-adhesive silt sized particles provided by Johnson et al (1971) and Johnson (1976). Further, the 2D and 3D Navier-Stokes solvers for compressible flow were modified to an incompressible flow solver since the CFD-DEM modelling of sand production is not a large-scale simulation that can capture the density changes caused by pressure or temperature changes as in real field conditions.…”

Section: Numerical Methods and Governing Equationsmentioning

confidence: 99%

“…For the rock characterization part, the previous research conducted by Rakhimzhanova et al (2018Rakhimzhanova et al ( , 2019a is used. Authors developed a simple 3D bond contact model for cemented sandstone material by modifying the previous existing JKR model for auto-adhesive silt size sand particles and reported the results obtained from 3D DEM simulations of triaxial compression tests of cemented sandstone of different density from loose to medium dense.…”

Section: Numerical Sample Preparation Methods and Simulation Proceduresmentioning

confidence: 99%

Numerical simulations of sand production in oil wells using the CFD-DEM-IBM approach

Rakhimzhanova¹,

Thornton²,

Zhao³

2020

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Three-dimensional CFD-DEM-IBM simulations of sand production in a sandstone formation, using periodic boundaries, were performed using 10000 frictional elastic spheres bonded together and compressed at 1 MPa of overburden pressure. Sand production simulation geometry and procedure are proposed, in which the cone penetration test (CPT) has been used to investigate a physical perforation penetration of the cemented sandstone material with the real-world grain size distribution from the Ustyurt-Buzachi Sedimentary Basin. The Immersed Boundary Method (IBM) was adapted for the sand production simulation geometry to simulate the fluid flow near the well casing. Oil with low viscosity and density was used as an injection fluid (reservoir fluid). Erosion near the perforation tunnel due to the pressure drawdown was examined, where the production of sand particles was initiated during the first flow due to the drag force that lifted the sand particles from the perforation damage zone. At the beginning of the simulation a sand arch was captured around the perforation tunnel and due to the fluid flow it collapsed and perforation cavity became larger. The amount and mass of produced sand particles were calculated.

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Numerical simulations of triaxial compression tests of cemented sandstone

Cited by 20 publications

References 25 publications

Numerical simulations of cone penetration tests in cemented sandstone

Numerical simulations of cone penetration tests in cemented sandstone

Numerical simulations of cone penetration in cemented sandstone

Numerical simulations of sand production in oil wells using the CFD-DEM-IBM approach

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