The physicochemical properties of nine summer base diesel fuels were compared. The influence of the group hydrocarbon composition on the low-temperature properties was examined using two fuels with similar physicochemical properties as examples. The physicochemical characteristics of the fuel were shown not to be definitive, rather, its detailed group chemical composition reflecting the molecular-mass

The development characteristics of micro-fractures in the soft coal seam, which are often neglected in water-injection and exploitation of coalbed methane, are more complex compared to the hard coal seam. To investigate the influences of micro fractures on the water-injection effects in soft coal seams, our research took the dust control through water injection in a soft coal seam with soft roof and

An efficient optimization and design method has been proposed and developed for Enriched-gas Water-Alternating-Gas (EWAG) injection process. The proposed technique is able to quantitatively determine the sizes of the enriched-gas slug and water slug for each cycle of the water-alternating-gas (WAG) injection process, as well as the total number of injection cycles. Applying this method provides the

A smart and inexpensive method of enhancing the informative content for estimation of the performance properties level of new and modernized fuels and lubricants is proposed. It ensures the quantitative generalized (integral) expression and comparison of the potential propensity of fuels and lubricants for transformations coming out in different ways depending on the operation conditions and the engineering

Acidizing is one of the most economical and effective methods for ensuring the continuous and stable production of an oilfield and improving oil recovery. Diverting acids are more and more widely used in oilfields. However, it is difficult to accurately determine such parameters as acid discharge, concentration, and acid-rock reaction duration before construction, which may result in poor acidizing

The method of alpha-olefin oligomerization employing a heterogeneous catalyst for production of base oils used in motor and transmission oils manufacturing is considered, which has better performance and is eco-friendlier than methods employing homogeneous highly corrosive catalysts like BF3, or AlCl3. New methods and technology for online analysis of the reaction products and process flows have been

The scientific and reasonable layout of jack-up drilling platform can improve the efficiency and safety of drilling platform operation. Through the application of analytic hierarchy process (AHP) and the establishment of comprehensive evaluation and analysis model, this paper analyzes the commonly used drilling platform layout scheme and optimizes the scheme to meet operational requirements and to

As one of the most advanced international drilling technologies at present, rotary steering has been extensively applied to large-displacement, long-distance horizontal, and complex structural wells with numerous advantages, such as strong steering deflecting capacity and good borehole quality. Push-the-bit rotary steering is nowadays commercially applied on a large scale. In the bottom hole assembly

Dispersion of oil-tank sludge using compositions of cationic, anionic, and nonionic surfactants followed by isolation of synthetic oil is a processing method with several disadvantages such as residual S-containing compounds and toxic spent solutions. The present work proposes the use of polycomplexants (sodium salts of iminodiacetate derivatives of fatty-acid triglycerides and mucosaccharides) as

Sand control measures in horizontal wells are mainly based on screens. Horizontal wells have a certain length of horizontal displacement and the kick-off section with large curvature. Therefore, it is necessary to evaluate the safety of the screen downhole run before it runs into the hole, in order to minimize the running risk. In this paper, the pipe string is divided into sections, and the equivalent

A study was carried out on aspects of phenomena on the interfacial boundary of acids and hydrocarbon systems of different complexity. These phenomena were evaluated relative to the interfacial tension measured by the pendant drop method. We discovered peculiarities of the interaction of hydrochloric and sulfamic acids with individual hydrocarbons as well as complex hydrocarbon systems. The complex

This article presents a brief comparative overview of the methods for controlling phase formation in oil disperse systems, of which those that record the initial phase-forming stages and are used for preventing undesirable complications in oil preparation, production, and transportation processes are investigated. Switch from static to dynamic methods is of special importance for creating steady multiphase

For oil wells with high sand content, traditional oil well pumps easily get stuck. Increasing the gap between the plunger and the pump cylinder can effectively prevent the sticking, but the gap leakage also increases, resulting in a decrease in the volumetric efficiency of the pump. As shown in this paper, when a rectangular groove is formed in the plunger of the oil well pump, it can significantly

Casing drilling has been recognized as a practical method to reduce drilling costs and avoid particular drill string problems that often occur in conventional drilling processes. To gain a better understanding of the whirling motion of rotating casing, the energy method was adopted to calculate the critical whirling speeds of casing for both pinned-pinned and fixed-fixed types of support. The calculated

The non-interference uniform speed rope drilling coring device is a tool for investigating samples of submarine underground leakage hydrate rock formations. In the process of coring, the penetration resistance of the shoe is large, and the rock stratum is disturbed, which results in disturbance of the rock sample's original state. In order to solve this problem, the standard core diameter is ∅72 mm

In recent years, the exploration and development of shale oil and gas reservoirs has become a hot topic in various countries around the world. The mechanical properties of shale are an important basis for evaluating the mining effect. Previous studies have shown that shale swells with water, which greatly effects its mechanical properties. Based on the analysis of shale composition, a clay mineral

This study considers the influence of stream treatment on the activity if iron-pillared montmorillonite in vacuum gas oil cracking and the change in its physical-chemical characteristics. Stream treatment was demonstrated to result in a decreased specific surface area and iron and silicon content, as well as in the strengthening of the catalysts. After stream treatment, gasoline and gas yield is reduced

Ruthenium nanoparticles of varying sizes were synthesized under microwave radiation and deposited on natural aluminosilicate nanotubes. The catalytic properties of the materials obtained in the hydrogenation reaction of benzene were studied, and the influence of ruthenium nanoparticle size effect on the activity of the synthesized catalysts was determined. Conversions, activation energies, turn-over

It is established that centrifugal pumps are more reliable than gear pumps. However, their efficiency decreases when the viscosity of the fluid pumped by the centrifugal pump increases, which makes their use at some oil facilities inadvisable. An accident risk assessment was made at a hazardous production facility for use of different types of pumps. Several measures have been developed to reduce accident

Deposition of pyrolytic carbon from the vapor phase onto the surface of various activated carbons, i.e., industrial (SKT and AG-3) and specially prepared via addition of KOH to a composition of carbon black with petroleum pitch followed by carbonization and washing, was studied. The deposition was carried out by passing benzene vapor in a stream of N2 through heated activated carbon. The obtained modified

The regeneration process for coked iron-oxide cinder, which has been proposed as an Effective contact (heat carrier) for thermal pyrolysis of light hydrocarbon feedstock, was studied. Oxidative regeneration of cinder at various temperatures was researched. The regeneration of the coked contact (determination of the dependence of the degree of coke burnout on time) was described mathematically. The