3,636 research outputs found
A GPU-accelerated package for simulation of flow in nanoporous source rocks with many-body dissipative particle dynamics
Mesoscopic simulations of hydrocarbon flow in source shales are challenging,
in part due to the heterogeneous shale pores with sizes ranging from a few
nanometers to a few micrometers. Additionally, the sub-continuum fluid-fluid
and fluid-solid interactions in nano- to micro-scale shale pores, which are
physically and chemically sophisticated, must be captured. To address those
challenges, we present a GPU-accelerated package for simulation of flow in
nano- to micro-pore networks with a many-body dissipative particle dynamics
(mDPD) mesoscale model. Based on a fully distributed parallel paradigm, the
code offloads all intensive workloads on GPUs. Other advancements, such as
smart particle packing and no-slip boundary condition in complex pore
geometries, are also implemented for the construction and the simulation of the
realistic shale pores from 3D nanometer-resolution stack images. Our code is
validated for accuracy and compared against the CPU counterpart for speedup. In
our benchmark tests, the code delivers nearly perfect strong scaling and weak
scaling (with up to 512 million particles) on up to 512 K20X GPUs on Oak Ridge
National Laboratory's (ORNL) Titan supercomputer. Moreover, a single-GPU
benchmark on ORNL's SummitDev and IBM's AC922 suggests that the host-to-device
NVLink can boost performance over PCIe by a remarkable 40\%. Lastly, we
demonstrate, through a flow simulation in realistic shale pores, that the CPU
counterpart requires 840 Power9 cores to rival the performance delivered by our
package with four V100 GPUs on ORNL's Summit architecture. This simulation
package enables quick-turnaround and high-throughput mesoscopic numerical
simulations for investigating complex flow phenomena in nano- to micro-porous
rocks with realistic pore geometries
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Capacity investigation of brine-bearing sands of the Frio Formation for geologic sequestration of CO2
The capacity of fluvial brine-bearing formations to sequester CO2 is investigated using numerical simulations of CO2 injection and storage. Capacity is defined as the volume fraction of the subsurface available for CO2 storage and is conceptualized as a product of factors that account for two-phase flow and transport processes, formation geometry, formation heterogeneity, and formation porosity. The space and time domains used to define capacity must be chosen with care to obtain meaningful results, especially when comparing different authors’ work. Physical factors that impact capacity include permeability anisotropy and relative permeability to CO2, brine/CO2 density and viscosity ratios, the shape of the trapping structure, formation porosity and the presence of low permeability layering.National Energy Technology LaboratoryBureau of Economic Geolog
Uncertainty quantification for CO2 sequestration and enhanced oil recovery
This study develops a statistical method to perform uncertainty
quantification for understanding CO2 storage potential within an enhanced oil
recovery (EOR) environment at the Farnsworth Unit of the Anadarko Basin in
northern Texas. A set of geostatistical-based Monte Carlo simulations of
CO2-oil-water flow and reactive transport in the Morrow formation are conducted
for global sensitivity and statistical analysis of the major uncertainty
metrics: net CO2 injection, cumulative oil production, cumulative gas (CH4)
production, and net water injection. A global sensitivity and response surface
analysis indicates that reservoir permeability, porosity, and thickness are the
major intrinsic reservoir parameters that control net CO2 injection/storage and
oil/gas recovery rates. The well spacing and the initial water saturation also
have large impact on the oil/gas recovery rates. Further, this study has
revealed key insights into the potential behavior and the operational
parameters of CO2 sequestration at CO2-EOR sites, including the impact of
reservoir characterization uncertainty; understanding this uncertainty is
critical in terms of economic decision making and the cost-effectiveness of CO2
storage through EOR.Comment: 9 pages, 6 figures, in press, Energy Procedia, 201
Numerical Investigation of Two-Phase Flow through a Fault
Imperial Users onl
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