The paper looks at the processes in an oil dispersed medium with dissolved gas. The model of interaction for the growing bubbles with acoustic fields is presented. It is shown how the change in pressure and oil saturation (namely, the density of oil particles in the entire flow) of the medium is associated with temperature fields in the system. Proceeding from this point, at a qualitative level, thermograms of wells obtained in the process of oil production is analyzing.

Keywords: colloidal system; dispersed bubbles; oil; heat of oil degassing; thermal fields.

References

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Since the beginning of the last century, geological and geophysical studies have been carried out in large volumes on the territory of Azerbaijan in order to study the oil and gas content, study the sources of earthquakes and other geological issues and compile sections, maps, reports, etc. In recent years, work has been carried out to clarify and re-evaluate the studies carried out with the use of new equipment. From this point of view, the issue on the agenda was the extent to which the identified deep faults in the oil and gas regions of Azerbaijan are accurate. In this article, the results of new geophysical (2D seismic and high-precision gravimetric) data obtained in the area passing through the West Caspian deep fault were considered, and it was found that the fracture did not find its reflection.

Keywords: deep fault; geosynclines; gravimetric exploration; seismic exploration; gravity; sediments; anomalies; gradient.

References

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The article considers the rationale for the formulation of an inhibitory clay-free drilling mud, including a complex reagent Polysil Potassium and CLSP for the conditions of deposits in the regions of Western Siberia. By the method of the planned experiment, the main equations of the main indicators (factors) of the studied drilling mud are obtained. According to the obtained dependencies, the concentrations of these reagents are selected, taking into account the specified parameters (FL = (up to 6) ml3/30 min, PV = (10-30) sP, YP = (80-150) dPa). In this paper, the results of regression analysis are carried out, with the help of which the dependences of the influence of the concentrations of the Polysil Potassium composition and pitch carbolignosulfonate on the properties of a clay-free water-based drilling mud are constructed. The regression analysis of drilling mud formulations has established that in order to maintain optimal technological parameters of sludge transport during drilling in the temperature range from 25 to 160 °C, the optimal ones are: the content of Polysil Potassium is 2.5%, CLSP is not more than 3%. This optimized system has a low dispersing capacity and satisfactory filtration and rheological characteristics.

Keywords: composition optimization; regression equation; inhibiting drilling fluids; complex reagents.

References

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The development and application of enhanced oil recovery technologies using nanofluids have been observed in last decade. It was found that the use of these reagents leads to the wettability alteration of the pore walls of the rock, an interfacial tension reduction, a decrease in oil viscosity, and an increase in the disjoining pressure. This paper presents the results of studying the displacement of residual oil on homogeneous quartz sandstone using the nanofluids, obtained by peptizing the sediments in a mixture of seawater with calcium and magnesium salts. Nitric and organic acids were used as peptizing agents. When using the developed nanofluids, an increase in oil production by 15-20% was achieved in comparison with seawater. A new approach for the mechanism of action of nanoparticles on the formation, leading to an increase in oil production, is proposed.

Keywords: oil recovery; displacement efficiency; nanofluid; peptization; wettability alteration; interfacial tension.

References

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The paper points out that the permeability for oil at residual water saturation (the starting point of the single phase flow curve for oil) is determined by the adsorbed residual oil saturation of the reservoir. A formula linking the adsorbed residual oil saturation coefficient with the phase permeability for oil with residual water saturation has been obtained. It is noted that the adsorbed residual oil saturation is also closely related to the residual water saturation of the reservoir. Such a connection is carried out through the formation shaliness. The proposed methodology allows structuring the residual oil saturation by type and mobility degree, as well as predicting the mobile oil residual reserves distribution to justify the recovery technologies.

Keywords: types of residual oil; relative phase permeability; productive reservoir.

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35. Akhmetov, R. T., Kuleshova, L. S., Mukhametshin, V. V., et al. (2022). Substantiation of the absolute permeability model taking into account the pore tortuosity factor according to the capillarimetric investigations results. SOCAR Proceedings, SI1, 1-8.
36. Akhmetov, R. T., Kuleshova, L. S., Veliyev, E. F., et al. (2022). Substantiation of an analytical model of reservoir pore channels hydraulic tortuosity in Western Siberia based on capillary research data. Bulletin of the Tomsk Polytechnic University. Geo Àssets Engineering, 333(7), 86–95.
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39. Grishchenko, V. A., Rabaev, R. U., Asylgareev, I. N., et al. (2021). Methodological approach to optimal geological and technological characteristics determining when planning hydraulic fracturing at multilayer facilities. SOCAR Proceedings, SI2, 182-191.
40. Akhmetov, R. T., Mukhametshin, V. V., Kuleshova, L. S., Grezina, O. A. (2021). Production facilities grouping based on the parameters of the capillary pressure curves generalized model on the example of Western Siberia oil fields. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 332(11), 89–97.
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A method for acid treatment of the bottom zone of a terrigenous heterogeneous reservoir, including isolation of highly permeable reservoir areas with a foam solution formed in the reservoir and subsequent treatment of low-permeability reservoir zones with an organic acid systemhas been developed. The composition of the organic acid system is selected depending on the carbonate content of the bottom well area. The efficiency of the method is increased by increasing the foam system stability, the depth and thickness coverage of the formation, and by reducing corrosion activity as a result of the use of organic acid systems. As carbonate rocks dissolve, the reservoir and filtration characteristics of the formation will increase.

Keywords: acid treatment; citric acid; whey; polymer; crosslinker; foam system; stability; carbonate content; permeability.

References

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The paper describes the gas lifted well performance evaluation ability based on operational parameters’ fluctuations analysis. Experimental laboratory research showed that the optimum gas-liquid lift performance correlates with minimal fluctuation of flowrate and pressures. Also, trials in the «Neft Dashlary» oilfield were conducted. Gas lifted well’s flowing tubing head pressure fluctuations were evaluated at different lift gas injection rates – below, above, and at the optimum gas injection rates. The results of field trials show that at optimum gas lifter well performance, the tubing head pressure fluctuation amplitude reduction and frequency increase is observed. This is in line with theoretical prediction and lab experiments conducted. It is shown that gas lifted and naturally flowing wells’ performance quick evaluation is doable during normal operation. The introduced method allows timely detection of well performance deviation from optimal. Necessary measures can be taken to optimize the wells without conducting additional surveillance.

Keywords: well; gas lift; flow rate; operational parameters; well performance.

References

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The creation of an effective system for the application of innovations in the development of oil and gas fields (OGF) at the present stage requires an appropriate innovation policy. There is a need to develop a strategy and methodology for the formation of approaches for the effective implementation of innovations in the development of oil and gas fields and ensuring their economic efficiency, both in the domestic and global markets. The development of innovative and methodological foundations, methods of integrated modeling, management and evaluation of the technical and economic efficiency of introducing innovative approaches in the process of OGF development is an important scientific and practical task.

Keywords: innovation; oil; gas; geological and technical measures; effective management.

References

1. Qasumov, E. R. (2012). Sovershenstvovanie ochenki effektivnosti vnedreniya innovachiy pri razrabotke qazovyx mestorojdeniy. Dissertachiya na soiskaniye uchenoy stepeni kanditata ekonomicheskix nauk. Stavropol: FQBOU VPO «Stavropolskiy Qosudarstvenniy Universitet».
2. Drozdenko, Yu. A. (2018). Strateqicheskoye upravleniye innovachiyami. Eqo sushnost I znachenie dlya predpriyatiya. Sbornik statey II Mejdunarodnoy nauchno-prakticheskoy konferenchii «Innovachionnoye razvitiye nauki i obrazovaniya». Penza: MCNS «Nauka i Prosvesheniye».
3. Qasumov, E. R. (2012). Ochenka effektivnosti vnedreniya innovachiy v nefteqazovoy otrasli. Saarbrucken, Deutschland: LAP LAMBERT Academic Publishing.
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The article considers and solves the problem of finding the optimal strategy for the development of terrigenous deposits of the Bobrikovsko-Radaev horizon of one of the deposits of the Ural-Volga region. Based on the analysis of the behavior of the curves obtained during geophysical surveys in more than three thousand wells, four main types of facies zones were identified, characterized by different porosity and permeability properties and formed development systems. As part of the analysis of the reservoir pressure maintenance system, a direct influence of reservoir properties on the efficiency of waterflooding was established, which made it possible to develop an optimization strategy and the formation of new injection sites. Using the method of multiple regression analysis, two statistical models have been obtained – the reservoir properties model and the facies model, which make it possible to quickly assess the recovery factor and select the optimal development system for fields with a lesser degree of knowledge.

Keywords: oil field development; geological structure; facies model; hydraulic fracturing; horizontal wells; hydrodynamic model; multiple regression analysis.

References

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The article provides an overview of enhanced oil recovery methods based on the injection of foam systems. In late-stage fields developing, it is necessary to block highly permeable watered formation zones. For this purpose, the use of foaming systems is promising. As a result of blocking high-permeability zones with foam systems, lowpermeability oil-saturated zones are involved in the development. The article considers the foaming mechanism, selection of foam stabilizers, foam migration in the formation. The influence of temperature, mineralization of formation water, the presence of oil on the stability of foam systems are investigated in this review. Experimental studies and field implementation indicate that technologies are very effective. Foam flooding increases the coverage efficiency in heterogeneous reservoirs, thereby increasing the oil recovery ratio. Investigations into this matter are therefore urgent and still ongoing today.

Keywords: foaming systems; stability; polymer; nanoparticles; microphotographs; salinity; displacement ratio; formation coverage; self-generating thermal foams; fractured reservoirs.

References

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The paper shows that the liquid obtained as a result of reservoir water desalination has a reduced magnesium ions content. Using such a liquid, it is possible to increase the mechanical strength of cement stone, its impermeability, adhesion to casing pipes and the well wall, as well as reduce magnesia corrosion.

Keywords: reservoir water; cement stone; construction lime; cement stone strength.

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Hydrocracking still maintains the pivotal role in the industry owing to the production of highly demanded transportation fuels. Having comprised pretreatment of VGO, comparative research onrecent catalysts, this review paper provides athorough picture about all consecutive steps in the hydrocracking process of vacuum gasoil. Discussing recovery of VGO from vacuum residue with minimum sulfur content, the focus was put on the catalyst characterizations and their influence on the conversion of VGO, the yield of middle distillate, gasoline as well asnaphtha. Both zeolite and amorphous catalysts have undergone a comparative analysis interms of their hydrocracking properties as well as catalytic activities during provided conditions. The article also examines the process of hydrocracking of vacuum gas-oil from Baku oils with the participation of modified aluminosilicate catalyst containing Ni, Mo to obtain high-quality raw materials for environmentally friendly diesel fuel and catalytic cracking process. The hydrocracking process of vacuum gas-oil conducted at 3-8 MPa pressure, 400-450 °C temperature range, in a flow-type Hungarian unit with a reactor capacity of 200 ml. During the investigations of temperature on hydrocracking process it was revealed that, when temperature rises from 400 to 460 °С the yield of diesel fraction increases from 35 to 50% wt. The yield of gasoline fraction constitutes 0-6% wt. and the produce of residue fraction decreases from 65% to 45%. With increasing of temperature from 400 °C to 450 °C the amount of sulphur decreases from 0.01% to 0.005% in composition of diesel fraction.

Keywords: vacuum gasoil; hydrocracking; diesel fraction; alumosilicate; catalyst; hydrodesulfurization.

References

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In paper the results of luminescent studies mixture of the straight-run diesel fraction with the product secondary oil refining — light gas oil coking at a mass ratio of components of 70:30% of the masses and raffinates obtained by extraction purification of the indicated feedstock with N-methylpyrrolidone and an ionic liquid - N-methylpyrrolidoneacetate synthesized based on N- methylpyrrolidone and acetic acid have been presented. A series of studies has established a relatively high extraction ability of the ionic liquid, compared with N-methylpyrrolidone. Since under similar conditions of selective purification using the specified ionic liquid as the extractant, bicyclic aromatic hydrocarbons are almost completely removed from the composition of the test mixture of the diesel fraction.

Keywords: raffinate; luminescent studies; extraction purification; UV spectral analysis; ionic liquid; N-methylpyrrolidone.

References

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The article examines the impact of the most significant factors in the global economic transformation - the pandemic and the «green» economy on the development of the oil and gas sector. The development trends of the global oil and gas sector in the pre-pandemic period were identified, the most significant changes in its development in the period 2019-2021 were identi-fied, which of these changes were most due to the impact of the Covid-19 pandemic, which were due to the influence of the «green» economy, changes that have arisen independently of these two factors are indicated. The forecasts for the development of the oil and gas sector in the con-text of the risks associated with the development of the «green» economy and the consequences of the Covid-19 pandemic in the short, medium and long term have been studied. Significant at-tention is paid to the issues related to the differentiation of long-term and short-term trends in the development of the oil and gas industry under the influence of these two system-forming fac-tors. The article also explored the strategic prospects for the development of the oil and gas in-dustry as an alternative to the «green» economy, revealed. What impact will the Covid-19 pan-demic presumably have in terms of confrontation between traditional oil and gas energy and green energy as a possible main energy of the future. The geographic features of the energy trans-formation are determined, the regions are identified, the development of the oil and gas sector of which is affected by the coronavirus pandemic and the «green» economy in different ways.

Keywords: oil and gas sector; Covid-19 pandemic; green economy; global economy; sectoral economy; global markets.

References

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A significant expansion of the range of polymer materials is associated with the constant improvement of technological processes for the production of polymer products, the quality of raw materials, the use of new additives to ensure the necessary consumer characteristics of products. Currently, due to the deterioration of the environmental situation associated with an increase in the amount of plastic waste, it is urgent to develop environmentally friendly additives that provide technical and operational characteristics for a certain period of operation, and then accelerate biodegradation in the environment. This paper considers the synthesis of a number of new environmentally friendly plasticizers based on adipic acid and aliphatic alcohols of normal and iso-structure C4-C10. The study of their physical and chemical characteristics showed the possibility of their practical use as PVC plasticizers. The tests carried out confirmed the good compatibility of the developed additives with polyvinyl chloride. The study of the glass transition temperature of the obtained samples of PVC compositions using the obtained plasticizers showed the high efficiency of their plasticizing action.

Keywords: adipate plasticizer; compatibility; efficiency; environmentally friendly; esterification; polyvinyl chloride.

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