Physico-Chemical Properties of Deep-Lying Oils

The article is devoted to the urgent problem of studying the features of the properties of poorly studied oils at great depths (more than 4,500 m), the need for development of which is caused by the continuing decline in oil production in traditional oil producing provinces. The analysis of the spatial distribution of reserves across the continents and countries of deep-seated oils and changes in their physico-chemical properties and the occurrence conditions, which made it possible to identify their main features. The studies used information on 21067 oil samples from 167 oil-bearing basins of the world, obtained from the database on the physicochemical properties of oils. The features of the physicochemical properties of deep-seated oils have been established, which are manifested in a decrease in the density and viscosity of oils, in a decrease in the content of sulfur and asphalt-resinous substances, and in an increase in the content of light fractions and oil gas in comparison with oils of small and medium depths.

Development of Methodics for Calculation of Share of Destroyed Hydrocarbons upon Flaring of Associated Gas at Sea Platforms

In the article the possibility to develop the new methodic for calculation of share of destroyed hydrocarbons upon flaring of associated gas is considered. It is shown that problem of flaring of associated hydrocarbon gas is that non-complete firing causing emission to atmosphere such products as СО2, aerosol (black carbon] and also CH4. Uncertainty in estimate of carbon fraction in total mass and also of ratio of concentrations of CH4 and СО2 over different oil producing sea platforms make it possible to form variation optimization task solution of which allows to evaluate the minimum guaranteed share of destroyed hydrocarbon gas upon its flaring.

Adsorption Treatment Izopentane from Dimethyl Sulfide

The adsorption capacity of a number of zeolites during the purification of the n-hexane + dimethyl sulfide model mixture from dimethyl sulfide was studied. Under the selected conditions (21–24°C, flow rate of the model mixture —120 ml/h, adsorbent volume — 50 ml) ultra-stable zeolite exhibits the greatest sulfur capacity 2.3% by weight.

The Prospects for Reducing the Carbon Footprint in Liquefied Natural Gas Industry

To meet the terms of the Paris Agreement, it will be necessary to restructure the world economy, make an energy transition to low-carbon development, which will subsequently affect the conventional energy sources industry and, in particular, the liquefied natural gas (LNG) sector. The article provides an overview of the prospects for reducing the carbon footprint in the gas industry. Technical, political and economic measures of decarbonization formation are given. The prospects of the natural gas export market for Russia are outlined. The classification of technologies related to carbon dioxide capture is presented. Special attention is paid to reducing greenhouse gas emissions in the LNG industry.

Data Processing Method of Well Testing

Horner’s traditional method of processing well test data can be improved by a special transformation of the pressure curves, which reduces the time the converted curves reach the asymptotic regimes necessary for processing these data. In this case, to take into account the action of the «skin factor» and the effect of the wellbore, it is necessary to use a more complete asymptotic expansion of the exact solution of the conductivity equation at large values of time. At the same time, this method does not allow to completely eliminate the influence of the wellbore, since the used asymptotic expansion of the solution for small values of time is limited by the existence of a singular point, in the vicinity of which the asymptotic expansion ceases to be valid. To solve this problem, a new method of processing well test data is proposed, which allows completely eliminating the influence of the wellbore. The method is based on the introduction of a modified inflow function to the well, which includes a component of the boundary condition corresponding to the influence of the wellbore.

Influence of Residual Fuel Sediment on Stress-Strain State of a Vertical Steel Tank

The article studies the formation of the total sediment by the incompatibility of residual fuels and oil products, analyzes and calculates the stress-strain state of the tank taking into account oil products and sediment. The studies examined the influence of temperature fields on the sedimentation of a mixture of residual fuels caused by the incompatibility of these components. Temperatures of a stored product, namely residual fuel RMK-700, and ambient temperatures are taken into account when modelling in ANSYS product. Effects that oil product has separately and oil product with bottom sediments have on a stress-stain state are compared. Laboratory tests were performed to accurately measure density depending on various temperatures. By means of finite element method a stress-stain state of a vertical steel tank RVS-20000 is examined, the calculations showed that the maximum stresses are located in zones of the weld seam and in the places of installation of the receiving-distributing branch pipe and manhole. In these areas bottom sediment and temperature difference influence the stress-stain state greatly, with the stresses becoming even higher as the wall gets thinner.

Approximate Method for Calculating the Pressure Change in a Nonequilibrium-Deformable Reservoir in the Case of Real Gas Flow to the Well

A method is proposed for determining the distribution of reservoir pressure over time in a nonequilibrium-deformable gas reservoir in the case of real gas flow to the well under different technological conditions of well operation, taking into account the real properties of the gas and the reservoir.

Using Oil Sludge in the Production of Lightweight Bricks

Efficient utilization of multi-tonnage oil sludge is one of the most pressing environmental problems. Since natural raw materials are currently depleted, it is necessary to involve oil sludge in the production turnover for the production of lightweight bricks. At the same time, the costs of geological exploration, construction and operation of quarries are excluded, and significant land plots are exempt from the impact of negative anthropogenic factors. Waste from oil production with an increased content of calorific value is advisable to use not only as a thinning agent, but also as burn-out additives for the production of thermal insulation materials, which include lightweight bricks. A lightweight brick, which belongs to class B with high physical and mechanical properties, was obtained.

Convergence Issues of Hydrodynamic Models of Reservoir Pressure Maintenance Systems

The article presents the problems of correctness of input of initial data, convergence of hydrodynamic models based on the results of calculating the hydraulic characteristics of the ground pipeline network of the reservoir pressure maintenance system using an automated calculation software package.

MoIncreasing The Efficiency of the Systems of Overhead Oil Pipelines Equipped with Electric Heating

Nowadays, there are several technical solutions for remote monitoring of the parameters of pipelines in thermal insulation. The analysis of such solutions is presented in the article. The authors proposed an algorithm for calculating the pressure drop in a stopped pipeline, suitable for determining leaks. The value of the algorithm increase due to the possibility of its use for calculating the parameters of hydrotesting in conditions of significant temperature differences. This implies the possibility of integrating the obtained relationships into parametric leak detection systems. The article also considers different proposals for increasing the efficiency of using pipelines equipped with SKIN systems. The authors proposed a diagnostic robotic device capable of overcoming complex sections of SKIN systems, as well as monitoring the system along its entire length.