The strength, pore structure, morphology and mineralogical composition of hydration products natural pozzolan (NP) nanosilica (nSiO2) based alkali activated binder (AAB) were examined. It was noted that AAB without nSiO2 relatively porous with the presence micro-, meso- macro-level pores. In contrast, as proportion increased in mixture, structure started to refine a reduction volume due transformation source material polymeric compound, such C-A-S-H higher Al absorption structure....

All-iron redox flow batteries (Fe-RFBs) can be the grid's most cost-effective and environmentally friendly electrochemical energy storage solution. However, low-capacity retention due to electrolyte degradation is major hurdle in its progress. This study examines effects of different additives their on Fe-RFBs system a full-cell configuration. Adding hydrochloric acid (HCl) results slow aging iron chloride compared that without HCl, leading improved performance. improvement evident terms...

Carbonate microporosity can vary significantly across depositional lithofacies and cycles, owing primarily to the high degree of heterogeneity in their pore sizes, throat radius, geometry, connectivity. This is further compounded by complex diagenetic alterations during various stages burial. In addition, presence micropores, which are abundant carbonate rocks, but not visible using conventional techniques, challenging characterize. To address this issue, our study focused on Middle Jurassic...

The petrophysical characterization of tight gas sands can be affected by clay minerals, adsorption, microfractures, and the presence high-density minerals. In this study, we conducted various petrophysical, petrographic, high-resolution image analyses on Saudi Arabian sand in order to understand how a complex pore system responds measurement tools. About 140 plug samples extracted from six wells were subjected routine core including cleaning, drying, porosity–permeability measurements. data...

Abstract Permeability determination of organic-rich shales is still a major challenge. Uncertainty in this estimate involves several factors. Two significant ones are the occurrence gas adsorption which can severely limit transport pores and understanding physical chemistry issues pore's surface area estimation when using various gases. In study, we reported our experimental results permeability measurement on unconventional shale samples, investigated effect type, pore pressure, effective...

By computing the total porosity φ and specific surface area S for a number of segmented digital volumes natural sandstones, carbonates, granular samples, as well their subvolumes, we observe fairly tight trends between those two variables. The emerging picture is different low-to-medium rocks from that high-porosity samples. In former, increases with increasing φ, while behavior opposite in particulates. We explain these by invoking simple theoretical derivations where consolidated samples...

Abstract Accurate determination of organic-rich shale permeability is still a major challenge. Various methods have been proposed to measure the on core plugs or crushed samples under various stress conditions using different fluids. Permeability obtained from and their could differ by two orders magnitude, potentially painting very views reservoirs resulting in differences asset development workflows. This situation only reinforces need for considerable additional focused work quantify...

We describe a study focused on the absolute permeability of reservoir carbonate rocks from Middle East and involving comparison experimental data numerical estimates obtained by combining digital-rock Lattice-Boltzmann Methods (LBM). The question “representativeness” site at which simulation is performed addressed as follows. First, low-resolution, CT X-ray scan core plug to identify regions large porosity (millimeter-sized vugs, etc.). These are then avoided postselect smaller sites (site...

Abstract Simulations of nuclear magnetic resonance (NMR) signal from fluids contained in porous media (such as rock cores) need to account for both enhanced surface relaxation and the presence internal field gradients due susceptibility contrast between matrix fluid phase. Such simulations are typically focussed on extraction NMR T 2 distribution which can be related pore size indirectly system permeability. Discrepancies such digital cores associated experimental measurements however...

Summary In-situ evaluation of fracture tortuosity (i.e., pore geometry complexity and roughness) preferential orientation is crucial for fluid flow simulation production forecast in subsurface water hydrocarbon reservoirs. This particularly significant naturally fractured reservoirs or postacid fracturing because the strong permeability anisotropy. However, such downhole in-situ characterization remains a challenge. study presents new method evaluating based on pulsed field gradient (PFG)...

Nuclear magnetic resonance (NMR) well logging tools are being commercially utilized for the characterization of various fluids confined within reservoir rocks. Conventional NMR T2-distribution measurements unable to quantify actual fractions crude oil and brine simultaneously present in Herein, we reported NMR-responsive paramagnetic [M-EDTA] (M = Fe3+, Mn2+, Cu2+) complexes having capability differentiate signals coming from by accelerating water (1H) relaxation. The formation these...

The conventional methods for controlling excess water production in oil/gas wells can be classified on the basis of mechanism (pore-blocking and relative permeability modification) used. Gel systems developed a pore-blocking completely block pores stop flow both oil water, whereas modifier (RPM) only restricts single phase fluid. gel working is known as total blocking gel. An invert emulsified (PAM–PEI) polymer system. same emulsion system tested this research work. dual-injection technique...

Abstract Subsurface unconventional shale samples are always scarce. Outcrop analogs often used as an alternative to enhance the understanding of corresponding reservoir formation. One assumption is usually made that rock composition and properties between outcrop subsurface remain same or similar, despite differences in their burial diagenetic histories. This paper presents a comparative case study investigate similarities from Two two Lower Silurian Longmaxi formation Sichuan Basin China...