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Chemistry and Technology of Fuels and Oils
Journal Prestige (SJR): 0.19  Number of Followers: 1  Hybrid journal (It can contain Open Access articles)ISSN (Print) 1573-8310 - ISSN (Online) 0009-3092 Published by Springer-Verlag  [2467 journals]
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- In-Situ Stress Determination in Anisotropic Formation Underground with the
Help of Wellbore Breakout Observations-
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Abstract: The in-situ stress information underground is of crucial importance for drilling and reservoir development. As the cost of direct stress measurements is high and only limited information can be obtained, the application of wellbore imaging devices made it possible to interpret the local stress state more economical. Breakout azimuths revealed by well logs are widely used to determine principal stress directions in traditional method, however strength anisotropic related to bedding planes may greatly affect breakout azimuth, width and depth, which can result in misleading for in-situ stress interpretations. Based on weak-plane borehole stability model and Mogi-Coulomb matrix strength criterion, we analyzed the relationship between in-situ stress and breakout geometry (azimuth, width and depth) both in isotropic and anisotropic formation. The results show that the azimuth of breakout is controlled by weak plane’s azimuth, while steep dipping bedding plane widen the breakout and make it extending into rocks. For specific strata with determined property, breakout geometry will change regularly with the increase of the principal stress ratio. A breakout accident observed in well WFSD-2 help to illustrate the method and the magnitude of the maximum horizontal principal stress is determined.
PubDate: 2023-03-16
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- Direction Optimization Model of Trenchless Horizontal Hole in Fractured
Formation-
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Abstract: Whether the hole is in safe state is quite essential in the construction technology of trenchless directional horizontal hole. Many consequences caused by hole wall instability will seriously affect the normal construction of trenchless engineering. It is proved by theory and practice that when the underground excavation passes through the natural cracks in the stratum, the instability issue of the hole wall is serious. It is necessary to select mud with appropriate density to inject into the hole for auxiliary drilling, so as to ensure that no collapse or slurry leakage happens within the hole. In this paper, aiming at the trajectory optimization of trenchless horizontal well in fractured formation, a mechanical model is built, and the optimal drilling direction of horizontal well under specific working conditions is given with the help of programming calculation.
PubDate: 2023-03-14
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- Hydrogen Production from Heavy Crude Oil
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Abstract: In various industries, hydrogen is used as the main raw material, as an auxiliary material, and/or as a fuel. Oil refining and petrochemical enterprises consume up to 50 % of the hydrogen produced. A promising method is proposed for hydrogen production, which consists in preliminary thermolysis of heavy oil stock, followed by catalytic conversion of steam-gas products, which makes it possible to reduce hydrogen production cost. The method will allow greater degree of feedstock processing and expansion of refinery feedstock base.
PubDate: 2023-03-14
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- Method of Integral Assessment of the Level of Performance Properties of
Fuels and Lubricants-
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Abstract: A simple mathematical method of predictive assessment of the level of performance properties of fuels and lubricants (FL) is described. The method allows multidimensional convolution and then comparison of all quantitative information received about the performance properties during the tests (use) of the FL and presented in mathematical models of chemmotological processes and ensures improvement of objectivity of evaluation of results of tests and use of FL. Some illustrations of applicability of the new method for assessment of properties of diesel fuels, automotive gasolines, and hydraulic fluids are provided.
PubDate: 2023-03-14
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- Study of Rock Damage Behavior Based on Configurational Mechanics
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Abstract: In the process of oil and gas drilling, under the action of mechanics, the wall rock will produce complex and high incidence of stress concentration, deformation, damage, cracking, fracture and other damage behaviors, resulting in the wall instability phenomenon. It may lead to complex accidents underground, resulting in huge economic losses. Therefore, it is of great theoretical and practical significance to grasp the failure behavior law of wellbore rock under mechanical action and study its failure mechanism. The early research on the instability and failure behavior of wellbore rocks was mainly based on the theory of fracture mechanics. Later, the theory of damage mechanics was introduced, which were all based on the theory of continuum. The development and change process of rock mechanical failure from small to large and from quantitative change to qualitative change caused by the accumulation of multiple defects in the internal microstructure of the rock can be described. This paper adopts the theory of configuration mechanics, which can well describe the complex microstructure and multi-defect evolution of materials such as inclusions, holes, dislocations, cracks, plastic flow, discontinuity, heterogeneity and anisotropy, and can be used to describe fracture mechanics. It provides a new idea for solving the complex defect problem.
PubDate: 2023-03-14
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- Design of Oil Shale In-Situ Extraction Heater Structure and Numerical
Simulation of the Fracturing Process-
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Abstract: Downhole continuous spiral folded plate heaters that generate high temperature air to heat oil shale are an efficient method of in-situ oil shale extraction. In this paper, the physical model of downhole continuous spiral folded plate heater and the physical model of oil shale heating are established respectively, and Fluent software is used to numerically simulate the above physical model. The heat transfer characteristics, outlet temperature, and comprehensive performance of this heater under different mass flow rates and heating powers are studied, and the heater performance is analyzed by the above indexes. The heating parameters were used to heat the physical model of oil shale. The optimal working parameters were determined by heating time and cost, and the working parameters were used to heat the other four physical models of oil shale. The oil production rate, heating rate, and accumulated power consumption of oil shale were analyzed, and the results were analyzed. The results show that the continuous type spiral folded plate heater has the best performance with the operating parameters of 10 kW power and 0.01624 kg/s mass flow rate, and the model IV has the shortest heating time, the fastest oil yield, and the lowest cumulative power consumption.
PubDate: 2023-03-14
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- Features of the Decomposition of Gas Hydrates in the Presence of Methanol
at Atmospheric Pressure-
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Abstract: The study of the decomposition process of gas hydrates at atmospheric pressure and temperatures below 0°C revealed that methanol could affect this process in different ways, depending on its saturation with environmental components. Indeed, due to the absorption of methane from the hydrate by methanol, the onset of its decomposition is observed at lower temperatures. Nevertheless, decomposition proceeds more slowly than with pure methane hydrate. When the methanol surrounding the methane hydrate is saturated with other medium components, the hydrate dissociation occurs at the equilibrium temperature (when intersecting the hydrate–ice–gas curve in a system without additives) regardless of the alcohol concentration. A similar situation is observed with hydrate obtained from a methane-propane gas mixture; however, under experimental conditions, ice begins to melt at a lower temperature compared to the dissociation point of methane-propane hydrate (in the case of methane hydrate, the situation is reversed: the hydrate is less stable). High concentrations of methanol (above 40 mass%) lead to a significant decrease in the temperature of hydrate decomposition. The data obtained show that methanol in low dosages (about 10 mass%) can be used for gas storage and transportation since, under certain conditions, it does not shift the equilibrium curve of hydrate formation and slows down the process of methane hydrate decomposition.
PubDate: 2023-03-11
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- Study on the Distribution Law of Casing External Load in Deep Wells
Considering the Cementing Quality Damage-
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Abstract: In view of the difficulty of well cementation in Tarim oilfield, the complex environment of cement sheath, and the mechanism and law of the effect of cementing quality on casing loss are not well understood. In this paper, based on ABAQUS finite element software, a threedimensional numerical simulation model of casing-cement sheath-strata considering the cementing quality is established. By simulating and analyzing the stress state of casing under different damage conditions of cement sheath, the influence mechanism of cementing quality on casing safety and reliability is revealed. It is found that the effective stress of casing under the condition of damaged cement sheath is significantly higher than that under the condition of intact cement sheath and intact cementation, and the risk of casing collapse is increased. The crack condition of cement sheath has little influence on the stress concentration of casing, while the lack of cement sheath and the lack of interface cause the stress concentration of casing to be larger. The influence degree of cementing quality on casing external load from big to small is: the second interface missing, the first interface missing, cement sheath body missing, cement sheath crack.
PubDate: 2023-03-11
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- Stability, Treatment, and Enhance Oil Recovery Ability of Fluorescent
Preformed Gel CQDS@PPG, and its Migration Status Study-
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Abstract: The application of polymer gels in Enhance Oil Recovery has been developed for years. However, the methods of tracing and positioning them within the layers are lacking. The traditional tracers added into the treatment fluid would be affected by the size, potential, and viscosity differences with polymer gels. As a result, the monitoring results of the tracer and the actual movement of polymer gels are various. Therefore, by synthesizing fluorescent components with polymer gels, driving and tracking are integrated, which can play the role of a tracer while flooding. The stability of the fluorescent CQDs@PPG has been tested under reservoir conditions. The fluorescent peak value of CQDs@PPG would not be affected by swelling, salinity, pH, and temperature. Further, the CQDs@PPG has been used in a specific reservoir condition in east China to test its flooding and treatment ability. The plugging rate of the CQDs@PPG within 1000 mD porous media could reach 90% with a resistant factor Rf of 15 and a residual resistant factor Rff of 10. When applied CQDs@PPG into heterogeneous porous media, the Enhanced Oil Recovery achieved 25.33%. In addition, with the help of a fluorescence spectrophotometer, the concentration of CQDs@PPG in a different position is directly obtained. Finally, the plugging status of the CQDs@PPG has been studied, and the scanning electron microscope images show that it has elastic deformation properties.
PubDate: 2023-03-11
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- Forecast of Fossil Fuel Demand Based On Low Carbon Emissions from the
Perspective of Energy Security-
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Abstract: Fossil fuel is a key factor related to national energy security. Studying and judging the development trend of China’s future demand for fossil fuel and obtaining fossil fuel stably and adequately is of great significance to ensuring China’s political stability, normal operation of the national economy and national military security. Under the background of low carbon emissions in China, starting from the perspective of energy security, based on China’s carbon emissions and GDP data from 1997 to 2019, four methods, namely Ridge Regression, ARIMA Time Series Model, BP Neural Network and Linear Regression, are used to forecast and analyze the demand for six fossil fuels: raw coal, coke, crude oil, kerosene, diesel and natural gas, providing a reference for national energy policy formulation and fossil fuel security early warning.
PubDate: 2023-03-11
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- Thermographic Investigations of Deasphalted Oil in the Presence of Zinc,
Nickel and Iron 2-Ethylhexanoates-
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Abstract: The results of thermographic investigations of the deasphalted oil obtained by deasphalting West Siberian oil tar with butane with the addition of zinc, nickel, and ferrous iron 2-ethylhexanoates and also without additives are presented. The effect of the metal-containing additives on the weight loss process and the change in the magnitude of heat fluxes during thermal exposure was established. The effect on the weight loss of samples of deasphalted oil containing ferrous salts with increase of temperature differs significantly from the effect of additives such as zinc and nickel salts.
PubDate: 2023-03-10
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- Optimization of the Composition of an Imidazoline Corrosion Inhibitor for
the Protection of Equipment in Carbon Dioxide-Rich and Acidic Environments
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Abstract: We examine the protective properties of imidazoline corrosion inhibitors with added thiourea and potassium iodide. A model of reservoir water saturated with carbon dioxide as well as hydrochloric and sulfamic acids were taken as aggressive media. The corrosion inhibition efficiency was evaluated using a gravimetric method under dynamic and static conditions in the carbon dioxide‑rich and acidic environments, respectively. The effect of individual compounds on the inhibition mechanism for metal was determined experimentally in media with different properties.
PubDate: 2023-03-10
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- Nature of Mercaptans in Straight-Run Jet Fuel Fractions
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Abstract: The dependence of mercaptan content in straight-run jet fuel on operation conditions of column C-1 of primary oil refining plant is shown. With rise of temperature at the bottom of column C-1 the amount of decomposed unstable sulfur compounds increases and in the process the decomposition products (mercaptans and hydrogen sulfide) are removed with the gasoline fraction in column C-1 and lesser amount of unstable sulfur compounds enter column C-2, which reduces mercaptan content in straight-run kerosene. The mercaptan contents in narrow oil fractions and straight-run jet fuel were compared. It was found that the mercaptan content is higher in straight-run jet fuel and they come from the oil and as well as from decomposition of unstable sulfur compounds, perhaps primarily disulfides.
PubDate: 2023-03-10
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- Effect of Lower Alcohols on the Formation of Methane Hydrate at
Temperatures Below the Ice Melting Point-
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Abstract: This work revealed that most water‑soluble compounds have a dual nature (thermodynamic promotion or hydrate inhibition) depending on thermobaric conditions. Indeed, by lowering the melting point of ice, water‑soluble organic compounds expand the region of water‑containing liquid phase existence below 0°C. This work considered typical thermodynamic hydrate inhibitors as alcohols (methanol, ethanol, and 2‑propanol). It turned out that even methanol does not exhibit inhibitory properties below the ice crystallization line, and it does not affect the equilibrium conditions of methane hydrate formation. In this case, the observed four-phase hydrate–ice–solution–gas equilibrium either corresponds to the hydrate–ice–gas line for the water-methane system (in the case of methanol) or lies at higher temperatures (in the case of ethanol and 2‑propanol). This allowed us to assume that practically any water‑soluble organic compounds will either exhibit the properties of thermodynamic hydrate promoters in a specific temperature range below 0°C or will not affect the hydrate–ice–gas equilibrium. In addition, the presence of the ice and an aqueous liquid mixture in the system accelerates the hydrate growth (compared to the hydrate growth from the bulk phase of ice). It should also be noted that, unlike conventional thermodynamic promoters, methanol does not alter the methane hydrate’s structure and gas capacity, which is more favorable. The data obtained can contribute to developing hydrate‑based technologies for gas storage and separation of gas mixtures.
PubDate: 2023-03-10
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- Thermal Conductivity of Oil Fractions at High Pressure
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Abstract: The results of measuring the thermal conductivity of samples of Usinsk and Kumkolsk oils and their heavy fractions in the pressure range from atmospheric pressure up to 1 GPa at temperature of 20 and 45°C are presented. It is shown that the dependence of thermal conductivity on pressure is a linear function and always increases with increasing pressure. The thermal conductivity of heavy fractions is higher than the thermal conductivity of oils.
PubDate: 2023-03-09
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- Thermal Conductivity of Oils at High Pressure
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Abstract: The results of the measurement of the thermal conductivity and the relative volume of two crude oil samples at pressures up to 1 GPa are presented. It is shown that the dependence of thermal conductivity on pressure is a linear function, depends on isothermal compressibility of the liquid, and always increases with rise of pressure.
PubDate: 2023-03-09
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- Preparation of Nickel 2‑Ethylhexanoate, a Precursor of Cracking
Catalysts for Heavy Hydrocarbon Feedstocks-
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Abstract: A method is described for the preparation of nickel 2‑ethylhexanoate, which is a precursor of a nanoscale catalyst for the cracking of straight‑run fuel oil, vacuum gas oil, heavy oils, and heavy oil residues. The first step of this method involves the reaction of an aliphatic carboxylic acid with ammonium hydroxide taken in equivalent ratio in water at 20‑65°C for 20‑60 min to give an aqueous solution of the ammonium salt of this carboxylic acid. In the second step, an aqueous solution of a metal chloride is added to the solution of the ammonium salt and the resultant metal salt of the aliphatic carboxylic acid is extracted with an organic solvent. The yield of nickel 2‑ethylhexanoate ranged from 89 to 98% depending on the reaction conditions.
PubDate: 2023-01-01
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- Evaluation of Optimal Fungi Strains for Development of Mycelium-Based
Biopolymeric Matrices-
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Abstract: Biopolymeric materials appear as promising eco-friendly and biodegradable matrices for the preparation of composite materials. In this work, G. lucidum, T. hirsuta, P. eryngii, F. velutipes, G. applanatum, L. edodes, and H. erinaceus fungi strains were studied and the fastest-growing fungi strains were revealed. The growth rate and the morphology of formed mycelium were studied depending on the fungi strain type and employed feeding substrate (malt agar, cellulose microcrystals, cellulose microfibrills). It was shown that the mycelium of G. lucidum and T. Hirsuta grown on cellulose microfibrils appears as intertwined hyphae with narrow diameter size distribution and has an optimal morphology as a substrate for the preparation of fibrous composite materials. .
PubDate: 2023-01-01
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- Research of a Self-Adaptive High-Performance Re-Fracturing Technology with
Knot Temporary Plugging in a Thin Reservoir with High Stress-
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Abstract: The K1g1 reservoir in the Jiudong Basin has many small thin layers, with strong interlayer heterogeneity and significant interlayer stress difference in the longitudinal direction. A low pumping rate and a large section of general fracturing were adopted in the early stage. The stimulation effect was unsatisfactory, and the production decreased rapidly. Therefore, improving the degree of longitudinal transformation is the key to the next fracturing. However, Complex conditions limited the selection of the layered fracturing technology. For example, the repeated fracturing wells have been perforated in large sections, the combination casing completion method is used, and the pumping pressure is high. This research summarized the applicable conditions of layered fracturing technologies. Combined with the geological conditions of Jiudong’s repeated fracturing wells, the temporary plugging layered fracturing technology is preferred. The temporary plugging agent is preferably the adaptive high-efficiency knot temporary plugging agent, and its degradation time experiment and ground plugging experiment are evaluated. The field application of adaptive high-efficiency knot temporary plugging re-fracturing technology was carried out in well C19-3. Based on three kinds of pressure rise performance during the fracturing process, it was judged that the fracturing obtained good temporary plugging and stratification effect. In addition, well C19-3 has achieved good production results after fracturing, which further verifies the applicability in the transformation of high-stress thin interbedded reservoirs in the Jiudong K1g1 reservoir. It provides ideas and references for the fracturing of similar thin interbedded reservoirs..
PubDate: 2023-01-01
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- Quantitative Study of Diagenesis and Dissolution Porosity in Conglomerate
Reservoirs-
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Abstract: In order to clarify the diagenesis of the conglomerate reservoir in the Lower Wuerhe Formation in Mahu 1 well area, Junggar Basin, the reservoir in the study area was studied in detail on the basis of core observation, thin section identification and analysis data. The results show that the Lower Wuerhe Formation is a reservoir with low porosity and low permeability. The pore types are mainly residual intergranular pores, followed by dissolution pores, and occasionally structural fractures and microfractures. The reservoir physical property is closely related to the rock facies type, among which the fine conglomerate is the best, the small conglomerate is the second, and the middle conglomerate is the worst. The Lower Wuerhe Formation in the study area mainly experienced diagenesis such as compaction, cementation and dissolution. In the later stage of diagenesis, zeolite minerals were transformed and dissolved, and a large number of dissolution pores were formed, which had a positive effect on reservoir physical property and oil content. Through three solution pore porosity intersection method to establish evaluation model, and solution pore zeolites in the studied area development situation to carry on the quantitative evaluation, fine recognition, effectively guide the advantage dessert for reservoir evaluation and subsequent development provides new ideas and methods, as well as neighbors area and the development of other clastic rock area reservoir development for reference.
PubDate: 2023-01-01
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