Summary Using focused-ion-beam (FIB)/scanning-electron-microscope (SEM) imaging technology, a series of 2D and 3D submicroscale investigations revealed finely dispersed porous organic (kerogen) material embedded within an inorganic matrix. The has pores capillaries having characteristic lengths typically less than 100 nm. A significant portion total gas in place appears to be associated with interconnected large nanopores the material. Thermodynamics (phase behavior) fluids these is quite...

Summary This paper presents an experimental study on the ability of organic-rich-shale core samples to store carbon dioxide (CO2). An apparatus has been built for precise measurements gas pressure and volumes at constant temperature. A new analytical methodology is developed allowing interpretation pressure/volume data in terms total porosity Langmuir parameters plugs. The method considers pore-volume compressibility sorption effects allows small gas-leakage adjustments high pressures. Total...

Abstract Using FIB/SEM imaging technology, a series of 2-D and 3-D submicro-scale investigations are performed on the types porous constituents inherent to gas shale. A finely-dispersed organic (kerogen) material is observed imbedded within an inorganic matrix. The latter may contain larger-size pores varying geometries although it that makes up majority pore volume, with capillaries having characteristic lengths typically less than 100 nanometers. significant portion total in-place appears...

Summary On the basis of micro- and mesoscale investigations, a new mathematical formulation is introduced in detail to investigate multiscale gas-transport phenomena organic-rich-shale core samples. The includes dual-porosity continua, where shale permeability associated with inorganic matrix relatively large irregularly shaped pores fractures, whereas molecular (diffusive transport nonlinear sorption) are kerogen pores. Kerogen considered nanoporous organic material finely dispersed within...

Summary Fluid mechanics of natural gas in organic-rich shale involves nanoscale phenomena that could lead to potential non-Darcy effects during production. In general, these are low-Reynolds-number and noncontinuum and, more importantly, pore-wall-dominated multiscale effects. this study, we introduce a new lattice Boltzmann method (LBM) investigate numerically simple pore geometries. The standard was developed the 1980s overcome weaknesses cellular automata has emerged recently as powerful...

Summary Measured permeability of an organic-rich shale sample varies significantly with applied laboratory conditions, such as the confining pressure, temperature, and measurement fluid type. This indicates that measured quantity is influenced by several mechanisms add complexity to measurement. The mainly caused stress dependence matrix permeability. Also, it because holds significant volumes fluids in sorbed (adsorbed, dissolved) states; sorption can also influence through its own storage...

Abstract Because of commodity pricing, the production from organic rich shales such as Barnett, Woodford, Eagle Ford and Marcellus has shifted significantly away dry natural gas window into more profitable condensate liquid hydrocarbon (oil) windows. The current practices, however, are based mainly on field experience operators far being a methodological approach for an optimized production. This is due to fact that our understanding condensation, capillarity multi-phase flow dynamics in...

Abstract Porosity and permeability are fundamental properties of hydrocarbon reservoirs that important to estimation the original in-place production rates. These petrophysical often characterized by pore size distribution. Scanning electron microscopy studies performed on organic-rich gas shale samples have provided two- three-dimensional images organic pores with maximum resolution 4-5 nm. However these also suggest some paths connecting even smaller. In this study a different set...

Summary In this paper, we present the results of steady-state methane flow in carbon nanotubes under reservoir conditions by use nonequilibrium-molecular-dynamics simulations. The show that contain a mobile adsorbed phase. mobility leads to significant shift up flow-velocity profile fluid across diameter nanotube. contribution phase transport is capillaries with size smaller than 10 nm. indicate gas organic nanocapillaries resource shales could be influenced Hence, new kerogen-permeability...

Abstract Recent studies have shown that shale gas industry is incorrectly determining gas-in-place volumes in reservoirs with a large sorbed-gas by not properly accounting for the occupied sorbed and free phases. Scanning electron microscopy (SEM) has discovered nanopores organic-rich sizes typically 3-100 nm range, although pores less than 3 cannot be captured current SEM technology. At scale adsorption layer thickness infinitesimally small. Thus portion of total pore volume would...

New Pore-scale Considerations for Shale Gas in Place Calculations Ray J. Ambrose; Ambrose Devon Energy Corporation and University of Oklahoma Search other works by this author on: This Site Google Scholar Robert C. Hartman; Hartman Weatherford Labs Mery Diaz-Campos; Diaz-Campos The I. Yucel Akkutlu; Akkutlu Carl H. Sondergeld Paper presented at the SPE Unconventional Conference, Pittsburgh, Pennsylvania, USA, February 2010. Number: SPE-131772-MS https://doi.org/10.2118/131772-MS Published:...

Abstract This paper presents an experimental study on the ability of Barnett shale core samples to store carbon dioxide. An apparatus has been built for psrecise measurements gas pressure and volumes at constant temperature. A new analytical methodology is developed allowing interpretation pressure-volume data in terms total porosity Langmuir parameters plugs. The method considers pore volume compressibility sorption effects allows small leakage adjustments high pressures. Total storage...

Abstract Recent studies have shown that shale gas industry is incorrectly determining gas-in-place volumes in reservoirs with a large sorption capacity by not properly accounting for the volume occupied adsorbed phase. Scanning electron microscopy has discovered nanopores organic-rich sizes typically 3–100 nm range; adsorption data show presence of smaller pores and micropores (< 2 nm) as part predicted pore size distributions. At diameters this scale potential high thus fractional...

Abstract Using lattice-Boltzmann simulation of steady-state gas flow we show that apparent permeability values nano-scale capillaries could be significantly higher than those predicted by the Klinkenberg slip theory. The difference is due to kinetic effects molecules have gone through inelastic collisions with walls on make up bulk fluid in capillary. energy bouncing back and associated momentum carried not a trivial matter diameter h less 100nm. It creates molecular streaming effect...

Summary A new-generation compositional reservoir-flow-simulation model is presented for gas-bearing organic-rich source rocks, including convective/diffusive mass-balance equations each hydrocarbon component in the organic (kerogen), inorganic, and fracture continua. The accounts presence of dispersed kerogen with sorbed-gas corrected dynamic porosity. Maxwell-Stefan theory used to predict pressure- composition-dependence molecular diffusion formation. are discretized solved numerically by...