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Authigenic clay (Aclay) is common in grain-supported tight reservoirs and exerts a primary control on reservoir’s percolation properties. In this study, we investigated the impacts of Aclay on pore connectivity, pore size distribution (PSD), and rock compressibility, to the resulting impacts on storage and percolation in order to arrive at a genetic classification of tight sandstones. QEMSCAN® combined...
The thermal method of in-situ combustion (ISC) was proposed to produce Tahe heavy oil; therefore, the oxidative characteristics of this oil are critical, especially its coking behaviors, which are closely related to the combustion process. In this work, a series of thermogravimetric and differential scanning calorimetry (TG-DSC) tests with isothermal and non-isothermal models were conducted to determine...
Pore connectivity of shale is a critical factor in shale gas migration and production. In order to investigate the pore connectivity from three typical shale formations in south China (Longmaxi, Niutitang, and Longtan shales), we conducted complementary analyses with field emission-scanning electron microscopy (FE-SEM), mercury intrusion capillary pressure (MICP), gas (CO2 and N2) sorption isotherm,...
The depressurization-induced decomposition behaviors of methane hydrate around the freezing point in porous media are investigated in this numerical study. A total of three cases have been simulated in a cylindrical reactor using a central vertical well with the production pressure PW=2.20, 2.60, and 3.00MPa, respectively. The simulation results of the pressure and temperature profiles and gas production...
This work studied the evolution of in-cylinder polycyclic aromatic hydrocarbons (PAHs) in a diesel engine fueled with n-heptane, and explored the effects of adding toluene to n-heptane on in-cylinder PAHs. In-cylinder PAHs were sampled in a direct injection diesel engine using a total cylinder sampling system. PAHs were analyzed by gas chromatography–mass spectrometry with programmed temperature vaporization...
The reduction in carbonyl compound emissions was evaluated using diesel engines running on Fischer–Tropsch diesel fuel synthesized from coal (CFT). A four-cylinder light-duty diesel engine fuelled with CFT and diesel fuel (DF) was used, and 13 individual carbonyl compounds identified in the exhaust. Tests were performed in the constant speed/varying load mode and in the constant load/varying speed...
In order to develop efficient suppression techniques and isolation materials for gas explosion, it is greatly vital to understand the intrinsic mechanism of gas explosion at atomic level. The methane explosion process was systematically explored by reactive force field molecular dynamics (MD) simulation and density function theory (DFT) calculations. The results show that the initiation step of the...
The present work was aimed at developing a method for determining the kinetics of low temperature coal oxidation based on thermogravimetric analysis and differential scanning calorimetry (TGA–DSC). The analyses of TGA–DSC on non-isothermal oxidation of three coals at a single heating rate were carried out. The measured heat release rates and derived apparent kinetic parameters of low temperature oxidation...
Pulsed corona discharge is an efficient method on NO oxidization, and the investigation of the oxidization process is significant both for model validation and industrial application. In-situ visualization of NO and OH in pulsed corona discharge was performed by planar laser-induced fluorescence (PLIF) in this work. Two dimensional NO oxidization and OH consumption were studied under different conditions...
Pilot-Scale Hydrate Simulator (PHS), a novel three-dimensional 117.8-L pressure vessel was developed to investigate the gas production from methane hydrate in porous media using the huff and puff method. In situ methane hydrate was synthesized in the pressure vessel with methane gas and deionized water in quartz sand with grain sizes between 300 and 450μm. In the PHS, a 9-spot distribution of vertical...
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