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Polymer flooding is employed to prevent immiscible viscous fingering between oil and water. If the polymer injection concentration is decreased rapidly, there is a high chance that fast growing miscible viscous fingers will pierce through the polymer bank and enter the oil bank. This is very detrimental to oil production. We performed numerical modeling of polymer flooding in one-quarter of a five-spot...
In this work, a new and pragmatic methodology has been developed and validated to predict phase boundaries together with their types as well as solvent solubility for solvents-heavy oil/bitumen-water systems in a temperature range of 298–573 K, for which the measured data are collected from literature. More specifically, two newly modified alpha functions respectively for non-water components and...
In order to evaluate shale gas content more accurately, a novel method for estimation of shale gas content in place is proposed based on the Polanyi adsorption potential and the London dispersion potential energy (P-L method). A series of integrated analyses were conducted on one shale core sample from the 7th member of Yanchang Formation (Chang 7 Member) in Ordos Basin, NW China, including on-site...
Fuel diversity is critical in the utilization of fluidized bed combustors. To support the use of diverse fuels including low rank coals and biomass, interactions of chemical components that lead to operational issues such as agglomeration need to be studied. Low rank coals and biomass are generally rich in alkali and alkaline earth metals and their role in the initiation of agglomeration is investigated...
Digestate, the residue following of anaerobic digestion, had attracted great attention recently as potential feedstock of pyrolysis. The results of component analysis verified that digestate was suitable for phenol production due to its considerable lignin content. The thermal degradation of lignin in digestate mainly occurred around 350–450 °C in thermogravimetric analysis. The amorphous cellulose...
Ignition delay time and sooting index of kerosene blended with a bio-jet fuel is measured for a comparative study with general aviation fuels. The new blended fuel is similar to a kerosene jet fuel (Jet A-1 or Korean domestic jet fuel) in terms of properties, H/C ratio, density, and heat of combustion. But, its ignition characteristics and sooting propensity are different from those of Jet A-1. Ignition...
Gas transport in coal and shale matrices does not always fall into the continuum flow regime described by Darcy’s law. Rather, a considerable portion of this transport is sporadic and irregular when the mean free path of gas becomes comparable to the prevailing pore scale. A nonlinear process influenced by non-Darcy flow components like gas sorption, gas slippage, and diffusion occurs throughout gas...
The practice of the green renewable fuels in diesel engines is increasing concerning the progressive deterioration of the green environment and the scarcity of the fossil fuels. In these aspects, several experiments in dual fuel mode (DFM) at different global fuel–air equivalence ratio (Φglobal), intake charge preheating and loads have been carried out considering biogas as the inducted renewable...
We have developed a heterogeneous catalyst for the decomposition and removal of dimethyl sulfide used as an odorant in fuels such as city gas in residential fuel cell systems. For the dimethyl sulfide decomposition at 500 °C over various oxides such as γ-Al2O3, TiO2, ZrO2, CeO2, SiO2, and MgO, it was found that adsorption of dimethyl sulfide and other products containing sulfur components, sulfurization...
The pyrolysis of lignocellulosic biomass has received extensive attention due to its potential as an alternative and renewable energy source. The chemical reaction kinetic parameters, obtained by micro-scale thermogravimetric experiments and optimized by the Shuffled Complex Evolution method, are one of the key factors to represent the pyrolysis process. The bench-scale Fire Propagation Apparatus...
This work investigates the catalytic performance of bimetallic Ni-Cu/Al2O3 catalysts for syngas production by methanol steam reforming. The synthesis and characterization of a series of Nix-Cuy/Al2O3 catalysts with various stoichiometric fractions (x = 10, 7, 5, 3 and 0 wt% and y = 0, 3, 5, 7 and 10 wt% to Al2O3 support, respectively) are investigated and discussed. The catalytic performance is evaluated...
There are four main classes of methane hydrate deposits in nature. These classes differ in their distributions of the methane hydrate layer, free water layer and free gas layer. The gas production rate, water production rate, gas-to-water ratio, gas and water production recovery during the depressurization dissociation process are different for hydrate samples of different classes. Water-excess hydrate...
Microbial Enhanced Oil Recovery (MEOR) is a term which is attributed to the process of utilizing bacterial activity for increasing the recovery factor of oil reservoirs. This process relies on several mechanisms especially interfacial tension reduction and wettability alteration mechanisms. The main purpose of this work is to evaluate the impact of these mechanisms during MEOR process for microorganism...
Liquefied Natural Gas (LNG) has become an increasingly important world energy resource and is a part of the European Union clean fuel strategy launched in 2013. Therefore, there are currently several ongoing measurement strategies considering quality specification of LNG. In this context, for application in gas engines, it is essential to understand the combustion behavior of these natural gas mixtures...
Permeability stress-sensitivity is the critical characteristic in reservoir development, especially for coalbed methane (CBM) reservoir. To investigate the permeability evolution during production in Shouyang CBM reservoir, Qinshui Basin, China, a new stress-sensitive permeability analytical model is proposed, while a time-lapse three-dimensional (4D) multi-physical coupling model is constructed....
Compared to nitrogen drying process, the mechanical thermal expression (MTE) drying process, a typical non-evaporation drying process with great potential in large-scale application, results in significantly different changes in characteristics of lignite such as pore structures, mineral matters contents and particle size. In this study, the effects of the evolutions of coal properties during nitrogen...
The minimum ignition currents for the stoichiometric ethylene-air mixture diluted with various amounts of argon, nitrogen or carbon dioxide were measured at various initial pressures within 20 and 120 kPa by using break sparks produced between Cd and W electrodes. The baric coefficients of ignition currents were determined from the correlation of minimum ignition currents with the total initial pressure...
It is well-known that ultra-fine particles, especially those with oxidized surface, are difficult to float using conventional methods. Flotation of oxidized ultra-fine particles has been a serious problem which should be well solved as the demand for energy is increasing. In this investigation, the flotation behaviors of fresh and oxidized fine coal (<45 μm) and the effect of mixing with coarse...
The existing moisture in shale samples makes the evaluation for shale gas reservoirs more difficult due to its impact on the methane adsorption capacity and pore structure measurements. This paper compares the pore structure characteristics and methane adsorption capacity between dry and wet shale samples from Perth Basin, Western Australia. Pores with size between 0.4 nm and 100 nm were quantified...
Diesel fuel mainly contains n-alkanes, iso-alkanes, cycloalkanes and aromatics, and varies with the source of crude oil and refining process. Although satisfying the same emission regulation, the particulate matter (PM) emissions and unregulated gaseous emissions of diesel fuel maybe vary a lot due to different fuel components. A series of experiments was conducted on a single-cylinder diesel engine...
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