A series of experiments were performed to study the influence of initial pressures and pressure drop rates on the amount of lost gas during the coring process. The change laws of cumulative gas production and gas production rate were investigated. The proportion changes of lost gas, desorbed gas, and residual gas were analyzed. The results show that the cumulative gas production can be divided into

In this work, the influence of NaCl on natural sweet and sour gas hydrate formation in the pressure of 115 bar and isothermal conditions (8 °C) have been compared. Salt concentration in the experiments was in the range of 1-7 wt% and the inhibitor was used at a constant concentration of 0.5 wt%. The results show that the presence of salt has been more effective on inhibition time, hydrate growth and

A 12-lumped reaction network for heavy oil catalytic cracking including 54 reaction paths is established according to the catalytic cracking reaction mechanism, clean gasoline, and light olefins production. The model kinetic parameters were calculated by Runge-Kutta method and BFGS based on the data from Davison Circulating Riser lab device and Python platform. The verification of the model parameters

Liquid hydrocarbons obtained from the pyrolysis of polypropylene and polystyrene were used as diluents to reduce the viscosity of a Mexican heavy crude oil of 10.6°API. Blends of oil and diluents were formulated with fractions of 5, 10 and 15 vol% of diluent. Viscosity results were plotted as a function of temperature and diluent volume fractions. The degree of viscosity reduction at room temperature

This study aims to develop a grid-based smart proxy model (G-SPM) for water flooding enhancement under different injection/production scenarios. The contribution of this work is combining experimental design and data mining techniques to prepare a high-quality database and introducing a hyper-feature to incorporate flow physics into database. The proxy was constructed by training a sequential neural

Based on the physico-chemical regularities, the unsteady mathematical model of the diesel fuel catalytic dewaxing process was developed. The influence of the raw materials composition and flow rate on the catalyst deactivation degree, product output and cold filter plugging point was shown. It was established, that while producing low-freezing diesel fuel, the higher the aromatic content in the raw

A commercially available anti-agglomerant (AA) was evaluated in water-in-crude oil (W/CO) emulsions at different water cut. The injection of an AA to an emulsion affects the induction time and rate of hydrate formation. When AA was injected before emulsification, AA performed better due to the higher number of AA molecules at the hydrate surface has been increased. The transition from stable a W/CO

One of the major challenges of microwave assisted EOR is the composition of produced liquid and gases. In this present contribution, heavy oil from one of Chinese oil field were exposed to time variant microwave radiation until 18 min. Experimental results illustrates that rapid increase in the gas flow rate was observed between 3 and 12 min radiation and after 12 min radiation, this value tends to

In order to increase the efficiency of microbiological methods of influencing the formation and use them in formations having conditions, which are unfavorable for microorganism activities, a new microbiological method of oil recovery increase was developed in which a rim of low-saline flush fluid was used prior to the injection of organic substrate. As an organic substrate, a composition of two types

Static Dissipater Additive (SDA) is conductivity improver additive that is added to low sulfur fuels to avoid sudden increase in conductivity that may occur during transfer/pumping of fuel. Due to surface active nature, SDA dosage may deplete with time. The monitoring of concentration of SDA is very critical and is carried out using conductivity measurement as per ASTM D2624. In this study, four ATFs

This study investigated the relationship between chemical and physical or rheological properties of asphalt binders during aging. Two types of base asphalt binders and their SBS modified asphalt binders were chosen. Results show that carbonyl index (IC=O) or sulfoxide index (IS=O) for base asphalt binders has the higher correlation coefficient square (R2) with rheological properties than physical properties

In this work, the efficiency of CO2-foam injection for enhanced oil recovery (EOR) is investigated. Six floods were performed on sand pack columns. Pure water injection, WAG injection and simultaneous injection of CO2 and surfactant solution with various concentrations were conducted. Notable difference was observed between oil production in secondary surfactant assisted WAG and other injection scenarios

The saturated and aromatic hydrocarbon maturity parameters of shale from a salt lake basin were studied. The results show that the most familiar maturity parameters such as tricyclic terpane/hopane, Ts/Tm, sterane 20S/(20S + 20R), ββ/(ββ + αα), MPI1, MPI2, MPI3, PAI-1, and triaromatic steroid (І)/triaromatic steroid (І+ІІ), are not applicable for oil and source rock from saline lakes. The ratio of

In this paper, CO2 assisted steam flooding technique was proposed to further enhance heavy oil recovery after steam flooding. PVT tests and 3D model oil displacing experiment were conducted to investigate enhancing oil recovery (EOR) mechanisms and oil displacing performance. The results indicated that CO2 dissolving in heavy oil could induce oil swelling, reduce oil relative density, and reduce oil

The increase in global energy demand for crude oil has encouraged a huge growth in crude oil production worldwide. The flow behavior of crude oil poses many problems when transported by pipeline over long distances under different environmental conditions. Rheological study of crude oil is necessary to better understand its behavior and thus contribute to its proper transportation. In order to obtain

The average total organic carbon (TOC) content of Chang 91 source rocks is 4.85%, and the main kerogen type is II1, and the average pyrolysis peak temperature is 452 °C in Zhidan-Ansai area, Ordos Basin. These show that Chang 91 source rocks have reached good to excellent level and peak hydrocarbon generation stage. Chang 91 source rocks were formed in semi-deep lacustrine sedimentary environments

To investigate the effect of bitumen physicochemical and thermodynamic parameters on its cohesive properties, 9 asphalt binders from different refineries were used. Chemical constituents, molecular weight distribution as well as thermodynamic parameters of asphalt were obtained. Peel test was applied to evaluate the cohesive properties within bitumen. The relationship between these parameters was investigated

In thermal de-asphalting procedure, where asphaltene particles are aggregated through heating crude oil at an elevated temperature, predicting the asphaltene particles’ diameter is of major importance. In this study, thermal de-asphalting process is modeled using adaptive neuro fuzzy inference system by considering isolating temperature, crude oil API and asphaltene content as inputs to predict asphaltene

A natural hydrogen donor, i.e., a subfraction of the coker gas oil, was used in thermal upgrading of the Venezuela extra-heavy oil. The role of hydrogen donor was quantitatively studied by a combination of thermogravimetric analysis and differential scanning calorimetry. The hydrogen donation was clearly evidenced and reliably evaluated by comparing the experimental and calculated thermal parameters

The purpose is to clarify the effect of warm-mix modifier on rheological properties of SBS warm-mix modified asphalt and its viscosity reduction mechanism. Different types of SBS warm-mix modified asphalt were prepared. The effects of modifier content and temperature on the rheological properties of SBS warm-mix modified asphalt were assessed. The viscosity reduction mechanism of SBS warm-mix modified

The performance of both ebullated bed H-Oil vacuum residue (VR) hydrocracking and fluid catalytic cracking (FCC) of vacuum gas oils (VGO) is interrelated. The increase of H-Oil unit reaction temperature maximizes VR conversion and augments the aromaticity and density of the hydrocracked heavy oils. The FCC of VGO blends that contain more aromatic H-Oil VGOs is featured by a lower VGO conversion. It

Steam injection is attracting a considerable interest in terms of EOR. In this work the oil-saturated sandstones and their extracts (Ashalcha field) were subjected to hydrothermal heating in the presence of iron oxide (II, III) nanoparticles in an autoclave at a 200 °C and 250 °C for 24 hours. SARA analysis revealed that the destruction of resins and asphaltenes is observed after thermo-catalytic treatment

This work is aimed to investigate the effect of CO2/CH4 solvent and N2/CH4 solvent injection on phase behaviors of condensate in DZT reservoir. The results indicate that CO2/CH4 flooding is vaporizing-gas drive when the mole fraction of CO2 is below 0.8, and it becomes condensing-gas drive with the mole fraction of CO2 greater than 0.8. To lower the minimum miscible pressure of multiple contact miscibility

Carbonium ion can be generated easier when low-carbon alcohols are added to hydrocracking tail oil, which initiate the cracking reaction of macromolecular n-paraffin. So the yield of lube oil base oil increases, while that of paraffin decreases, but the total yield of the two products increases. When the low-carbon alcohol is added to the raw oil for non-hydrodewaxing reaction of hydrocracking tail

A series of NiO–MoO3 promoted Pt/ZrO2–TiO2–Al2O3 catalysts were investigated in the cracking reactions of n-decane under supercritical conditions. The results show that the addition of NiO could facilitate the formation of strong acid sites, which are contributed to improving the cracking performance. The catalyst with 6.0 wt.% NiO shows the highest catalytic cracking activity among all catalysts,

The naphthenic acids (NAs) present in the crude oil can lead to the corrosion problems in oil refinery equipment apart from reduces the performances of the oil. In this study, the method to remove NA were done by means of extraction using sodium thiocyanate in ethanol with the aid of Ni/Ca/Al2O3 and Ni/Ce/Al2O3 catalysts at 27 °C reaction temperature. The catalyst was prepared by incipient wetness

The adsorption of Acid Red 10B from aqueous solution has been studied in a fixed bed adsorber using raw and activated petroleum coke as an adsorbent. The activation of the petroleum coke was done with different impregnation ratios of petroleum coke with KOH, activation time and activation temperature to find the best activation condition. The activated petroleum coke is used for the fixed bed adsorption

Methane steam reforming (MSR) reaction is a promising industrial hydrogen production technology. In this study, the impregnation method was deployed to prepare mono Co and Co-based bimetallic catalysts loaded on CeO2 nanoparticles as the catalysts for MSR. Results show that the improved Co-based bimetallic catalysts have good performance compared to the mono one. The best catalyst sample was Co-Ni/CeO2

Accurate knowledge about vapor–liquid equilibrium (VLE) and phase behavior of impure carbon dioxide has noticeable effect on designing carbon dioxide capture and storage (CCS) processes. In the current work, a novel computational method namely least square support vector machine (LSSVM) was used to predict VLE of binary system of carbon dioxide with nitrogen, hydrogen, oxygen, and argon. To this end

In-situ combustion process is a widely used approach as an enhanced oil recovery (EOR) method in shale and heavy oil reservoirs. In this present contribution, normal propane combustion has been investigated in a porous media. In this regard, fluid flow and heat transfer equations coupled with reaction network of propane combustion in a porous media and solved with COMSOL software. A good agreement

Type I and II kerogens, isolated from outcrop shales in the Songliao Basin, were performed a programed sealed-heating kinetic process. Both carbon isotope values of pyrolysis-residual kerogens and those of asphaltene extractions present gradual enrichments dependence on increasing Easy %Ro and biomarker maturity ratios. The carbon isotope (δ13C) values are used for the first time to analyze a close

Sasobit is an additive to produce asphalt mixes suitable for the use at lower construction temperatures without sacrificing the mix properties. However, Sasobit damages the time–temperature superposition principle (TTSP) of asphalt. Therefore, it is difficult to characterize the constitutive equation of Sasobit-modified asphalt. This study has modeled the rheological response of Sasobit-modified bitumen

According to the current situation of the W5 fault block, it is necessary to carry out the surface-active polymer flooding. By physical simulation, the optimal concentration is 1000 mg/L, the optimal slug size is 0.3PV, and the earlier the injection opportunity, the slower the injection rate, the higher the recovery rate. By numerical simulation, the recovery rate of the optimal scheme is 27.2%. Compared

H-ZSM-5, H-IM-5, and H-IM-5(DS) zeolites were synthesized as highly active and shape selective catalysts for the alkylation of benzene with methanol. The samples were characterized by N2-adsorption-desorption, XRD, SEM, TEM, NH3-TPD, and Py-FTIR. The benzene conversion and xylene selectivity were in the same order H-IM-5(DS) > H-IM-5 > H-ZSM-5, while the toluene selectivity was in the reverse order

The stable carbon and hydrogen isotopes of light crude oils from deep reservoirs of Cambrian-Ordovician strata in Tazhong area of Tarim Basin, NW China were investigated. The δ13C and δD values determined from the oil samples ranged from −32.94 to −29.53‰ and −121.36 to −87.78‰, respectively. A positive correlation exists between δ13Coil and δDoil when the δ13Coil < −31.15‰, while a negative correlation

A transition metal oxide catalyst of copper oxide nanoparticles was synthesized by a conventional non-hydrothermal method. It was studied as a catalyst in thermocatalytic upgrading and viscosity reduction of heavy oil in the laboratory. The experimental results showed that the viscosity of heavy oil may be reduced by 85.75% with 0.2 wt% catalyst at 350 °C for 40 min. With determinations of analyzation

This study investigates the reduction of emissions of a single-cylinder diesel engine fueled with diesel and Di-tetra-butyl peroxide blends by altering the engine load from 1.1 to 5.5 kW with three repetitions. The objective of the study is to investigate DTBP as an ignition improver and to diminish the emission level of a diesel engine. Two concentrations of DTBP (10 and 20% by volume) were blended

In the petroleum and industrial fields, hydrates are easily formed in the process of oil and gas transportation, which affects the normal operation of pipelines and even causes safety accidents. The formation of hydrates in four different oily white oil emulsion systems of 20%, 30%, 40% and 50% was compared. The change of emulsion chord length before and after hydration reaction was studied, and the

Five paraffin-degrading bacteria were isolated from petroleum-contaminated soil collected from Liaohe Oilfield, from which a dominant strain named SS13 was screened out via D2O-labeled single-cell Raman spectroscopy. The dominant strain was identified as Stenotrophomonas maltophilia, and its potential effect in the biodegradation of crude oil was investigated. Results show that the strain produces

In this study, a novel bitumen modification by aluminum oxide (Al2O3) nano particle was investigated to enhance the performance of bitumen and hot mix asphalt (HMA). Nano particles were mixed with the bitumen in three percentages to improve the rutting and fatigue performance. After that, rheological tests were conducted on nano particle modified bitumen to determine rheological properties and rutting

Removing the paraffin deposit plugs has always been a technical problem in petroleum production process. In recent years, ultrasonic treatment technique has attracted much attention because of low cost and pollution-free. In this article, the ultrasonic treatment for removing paraffin wax was systematically investigated. The effectiveness of factors on the core paraffin wax removal were analyzed through

A novel multilayer perceptron artificial neural network (MLP-ANN) model is proposed to estimate the dew-point pressure (DPP) of gas condensate reservoirs as a function of gas composition, reservoir temperature and, molecular weight and specific gravity of C7+. For this purpose, a comprehensive database was prepared by reviewing literature and the results of MLP-ANN are graphically and statistically

(2020). Statement of Retraction. Petroleum Science and Technology. Ahead of Print.

During oil production from stratum to wellbore, to prevent the asphaltene precipitation, the rules of the changes of the onset of asphaltene precipitation under different temperature and pressure are systematically studied by laboratory experiment. The results show that the AOPP of the oil samples at 30 °C, 50 °C, and 70 °C are 20 MPa, 17.7 MPa, and 15.5 MPa, respectively. Combined with the temperature

This research is intended to investigate the effects of aromatics, resins, and asphaltenes on the oxidation behavior of heavy crude oil. The results showed that aromatics had inhibition effects on exothermic behavior of the oil. The thermal effect of oil + resins in the low temperature oxidation (LTO) stage was more intense relative to other mixtures. Compared to other samples, the LTO activation energy

Due to the significant impacts of CO2-oil miscibility, reservoir heterogeneity, and injection pattern on oil production, a fascinating experimental investigation is provided. The outcomes express that CO2 consumption in homogeneous cores are lower than heterogeneous cores. A small amount of permeability heterogeneity as one of the indications of heterogeneity, can highly effect on the performance of

The saturates and aromatic constituents of the resulting light crude oil during catalytic and thermal upgrading of Omani heavy crude oil were further characterized to elucidate the crucial role of Ni–Co/γ-Al2O3 catalyst and gas media. GC-MS analysis confirms that water-gas shift reaction (WGSR) promotes a type of hydrogenation reaction resulting in higher saturates contents of the upgraded oil in nitrogen

The work is aimed at establishing the thermodynamic, kinetic and hydrodynamic regularities of the vacuum gas oil catalytic cracking and the zeolite-containing catalysts regeneration, which served as a catalytic cracking reactor mathematical model development basis. The prediction calculations ensured the catalyst circulation ratio optimization depending on the catalyst flow temperature after regeneration

In this study, to have an accurate approximation of dynamic viscosity, radial basis function artificial neural network (RBF-ANN) is employed and developed for normal alkanes. This is done by considering the distinct number of carbons in n-alkanes, certain temperatures, and different pressures. Moreover, in order to train and test the predicting model, a databank of 228 experimental data is gathered

The pore size distribution of four shale samples were characterized by and compared between CO2 adsorption, N2 adsorption, MIP and NMR. The results show that CO2 adsorption has an absolute advantage for characterization of pores smaller than 2 nm. N2 adsorption is reliable for 2–50 nm pore characterization and is superior to NMR in the 2–10 nm range. NMR has advantages for 10–100 nm pore characterization

The effect of stirring and attrition-scrubbing conditioning pretreatment on organic content enrichment was investigated. A relatively coarse particle size (−0.5 + 0.1 mm) was used to avoid high comminution cost, the environmental impact of fines disposal plus their technical defects in the retorting process. The results showed that the pretreatment in acidic medium was promising due to carbonate minerals

Trinity reservoir refers to the normal oil, heavy oil, and bitumen distributed from bottom to top in Wuerhe oilfield affected by geological movements. Discriminating between producible oil and other hydrocarbons is critical for production planning. In this study, the NMR experimental data, chemical compositions, and geological structure of the samples are compared and analyzed. Geological movements

Cr3+ contained sulfuric acid aqueous solution and β-PbO2/Ti anode were prepared for electrochemical oxidation-distillation desulfurization of straight-run gasoline. Strong oxidant (Cr2O72−) was formed and reacted with organic sulfides. The oxidized sulfides were removed by distillation. Under optimal operating conditions, the desulfurization rate of gasoline reached to 99.16%.β-PbO2/Ti electrode were

Dewpoint pressure is an important parameter for reservoir management and characterization. Gas condensate reservoirs experience significant reduction in productivity when initial reservoir pressure decreases below the dewpoint pressure. As such, an effective and efficient methods for prediction of this thermodynamic quantity are crucial for operational plans. In this article, a hybrid artificial intelligence

Hydraulic sand-fracturing experiments are conducted at different proppant content and fracturing fluid viscosities on samples obtained from the shale reservoirs in the Guanyinqiao Member. The characteristics of the obtained sand-fracturing curve and proppant distribution are investigated. The test results establish that the fracture morphologies and proppant distribution after sand fracturing have

In this work, an accurate predictive correlation has been proposed, which presents an easy RVP estimating for a light crude oil with avoiding the expensive and time-consuming laboratory methods. The established correlation for predicting RVP of the investigated light crude oil depends on few physical properties inputs of API gravity and pseudocritical properties. The predicted RVP values have been

Derivative UV-vis spectroscopy increases the resolution of the bands obtained in a zero-order using the first and second derivative. The first derivative of UV-vis spectrum of asphaltenes solutions allows identification of 5 maximums: to 225 nm benzenic compounds, to 259 nm naphthenic compounds, to 295 nm phenanthrene, to 328 nm for linear three-ring aromatic chromophores and by most compact four-ring

In this study, using the response surface methodology (RSM) method, 1-butanol and diesel fuel blends heat capacity is predicted. The study of heat capacity was performed with three factors of molar fraction, viscosity, and temperature. In this study, the prediction of 1-butanol and diesel fuel blends heat capacity by central composite design (CCD) method is considered, which in addition to reducing

The effects of process conditions: temperature of 478–503 (K), pressure of 1.5–2.5 (MPa) and space velocity (SV) of 1–22.5 (NL gcat-1h-1) on Fischer-Tropsch product distribution were studied by using a 1-L stirred tank slurry reactor and a 0.48% Re–25% Co/Al2O3 catalyst . Response surface methodology was applied to investigate the effects of operating variables and optimization of reaction conditions

Composition and solubility of asphaltenes from various oil fields have been compared. The structural group abundance in the asphaltenes have been determined according to Fourier transform infrared spectra, while the contents of sulfur, vanadium, nickel, vanadyl complexes, and free stable radicals has been evaluated using various methods. The solubility of asphaltenes in the n-heptane-toluene system