Thermobaric Conditions Research Articles

Raman Spectroscopy Study on Chemical Transformations of Propane at High Temperatures and High Pressures

This study is devoted to the detailed in situ Raman spectroscopy investigation of propane C3H8 in laser-heated diamond anvil cells in the range of pressures from 3 to 22 GPa and temperatures from 900 to 3000 K. We show that propane, while being exposed to particular thermobaric conditions, could react, leading to the formation of hydrocarbons, both saturated and unsaturated as well as soot. Our results suggest that propane could be a precursor of heavy hydrocarbons and will produce more than just sooty material when subjected to extreme conditions. These results could clarify the issue of the presence of heavy hydrocarbons in the Earth’s upper mantle.

Methane gas hydrates influence on sudden coal and gas outbursts during underground mining of coal deposits

The mechanism of gas hydrates formation in coal seams is studied in the paper, as well as their involvement is hypothesized in the sudden outbursts of coal and gas during underground mining of coal deposits. It has been substantiated and proved that one of the real reasons for subsequent outbursts is the formation of gas hydrates in coal as a type of secondary gas hydrate deposits. It has been also substantiated that, as a result of coal metamorphism, a large amount of gaseous hydrocarbons, mainly methane, is formed in the seam, which under certain thermobaric conditions leads to the gas hydrates formation. It has been experimentally proved that the mechanism of such inclusions formation between gas hydrate and coal is a result of strong chemisorption, which, when disturbing thermobaric conditions, leads to gas-dynamic activity of coal seams. It has been revealed that during the dissociation of gas hydrates, obtained in a medium of activated coals, twice as much gaseous methane is released. The research analysis indicates that the formation of natural gas solid solutions in coal pores under certain thermodynamic conditions and the natural humidity, characteristic of coal seams, is one of the causes of sudden coal and gas outbursts. The gas hydrates dissociation influences on the gas-dynamic activity of a coal seam and the formation of an outburst hazardous situation.

Analysis of the application for the magnetohydrodynamic effect in the hydrocarbon production

Nowadays the main share of oil fields is at a late stage of operation. It is characterized by high water cut of the extracted products. Salts in the formation fluid, under certain thermobaric conditions, settle on the process equipment and they cause its failure. Failure of technological equipment entails the well’s downtime and high material costs. Water-soluble salts in the formation fluid are subject to electrolysis. There, the molecules of the substance are decomposed into ions. The Lorentz force acts when a magnetic field is applied to the ions. The magnetohydrodynamic effect is manifested in the formation fluid. The purpose of the article is to analyze the applicability of the magnetohydrodynamic effect for hydrocarbon production. The chemical composition of formation waters for some deposits is given. On its basis the chemical model for electrolysis of the main salts in sodium chloride and potassium chloride contained in the formation liquid is constructed. The design and operation principle of the simplest magnetohydrodynamic pump is considered. The description of the developed laboratory sample of the magnetohydrodynamic pump is given. The main conclusions are reflected in this article.

РЕЗУЛЬТАТЫ ПЕТРОФИЗИЧЕСКИХ ИССЛЕДОВАНИЙ ОТЛОЖЕНИЙ ПРОДУКТИВНОЙ ТОЛЩИ СЕВЕРНЫХ НЕФТЕГАЗОНОСНЫХ ПЛОЩАДЕЙ БАКИНСКОГО АРХИПЕЛАГА

The complex results of petrophysical testing of rocks, taken from prospecting-development wells of Duvanni-deniz, Sangachal-deniz, Bulla-deniz, Garasu and etc. areas, where the sediments of productive stratum are widely expanded, have been given. Average values of granulometric composition of rocks of productive unit of the above areas by the section have been recounted. The problem of dependence of permeability on porosity and depth was solved. Dependence between physical parameters for the individual kinds of rocks, dependence between physical properties and material structures are established. The results of various petrophysical research methods show that the filtration capacitance properties, in general, deteriorate with depth. However, in certain cases, in clay and carbonate rocks, reservoir properties can improve, due to the appearance of secondary porosity under relatively stringent thermobaric conditions. The histograms, which consist of average values of granulometric composition of productive stratum rocks when crossing some places of archipelago are constructed, the problems of dependence of permeability on porosity and depth were solved. The researches showed, that the physical process of the same- named and same-aged features rocks change in the result of geological-physical processes, getting different values. It's noticed, that the porosity and permeability are increasing from north-west to south-east by changing lithological composition.

CONCEPTUAL APPROACH, PECULIARITY AND COMPLEXITY OF THE OIL RIM DEVELOPMENT UNDER CONDITION OF ABNORMAL LOW RESERVOIR PRESSURE AND TEMPERATURE: THE CASE OF CHAYANDINSKOYE OILFIELD, EASTERN SIBERIA

The oil rim reserves development suggests complexity in maintaining the balance of gas and oil withdrawals from the reservoir, choosing the optimal well design and geosteering, justifying well operation conditions, etc. In addition, gas and oil reservoir can be complicated by diagenetic alterations of deposits, blocked structure, abnormal thermobaric conditions. The paper presents the results of conceptual approach to the Botuobinskiy horizon’s oil rim development design at the Chayandinskoye oil and gas condensate field with the presence of the above complications. This experience can be applied to assess the majority of fields in Eastern Siberia.

Determination of stress in the geological medium on the basis of well data using acoustoelastic correlations

A method has been developed to determine normal components of the stress tensor in deformed geological media on the basis of geophysical well logging. The theoretical basis of the method is the acoustic correlations of the non-classical linearized approach of nonlinear elastodynamics. Analytical formulae are obtained to calculate the stress in the geological medium in cases of small and large deformations. Geophysical well logging data located in the South Caspian basin have been used. Thin-layered one-dimensional models of the medium have been compiled on velocities of pressure and shear waves, density and lithology of rocks. The thickness of each layer of the model is several centimeters, which is equal to the observations in the well. The data of each model related to the same rock lithology is divided into clusters using artificial neural networks to consider the influence of changes of thermobaric conditions of the geological medium on acoustic properties of rocks. Values of elasticity moduli of the second and third orders and components of normal stress tensor have been calculated according to models for each lithology of rocks and a cluster of data. It has been revealed that elasticity moduli of the third order are much more sensitive to the variability of elastic properties of the medium than moduli of the second order. The obtained numerical results on all clusters of each lithology of rocks are averaged. At the same time, the number of medium layers on each data cluster has been used as weights. The number of medium layers in each rock has been used as weights while averaging the results for all the rocks. The correlations between numerical values of normal components of stress tensor caused by geostatic pressure and similar values caused by geodynamic changes of stress tensor have been studied. It has been revealed that values of stress bulk caused by geostatic pressure are significantly lower than stress caused by geodynamic changes. The obtained acoustic formulae allow determining values of stress in the geological medium of any region considering the influence of modern geodynamic processes.

Stability of relic methane hydrates under climatic changes in the Holocene

The results of numerical modeling of the thermal regime of high-latitude permafrost regions of Western Siberia (the Yamal Peninsula) for the last 6 thousand years are presented. Thermobaric conditions for stability and dissociation of continental methane hydrates are defined. It is shown that at the present time relict methane hydrates can exist at depths of up to 150 m in the strata of frozen soil of Yamal above the modern boundary of the stability zone, having “survived” warming in the Mid-Holocene warm period (about 6,000-5,000 years ago) at negative temperatures in the permafrost. According to the results obtained, the current warming in Yamal region exceeds the warming of the Mid-Holocene. The increase of the temperature of the permafrost layer can reduce the strength of the soil and lead to dissociation of the near-surface gas hydrates.

Advanced techniques for determining thermal properties on rock samples and cuttings and indirect estimating for atmospheric and formation conditions

A set of advanced methods and instruments was developed to improve essentially quality of experimental data on reservoir thermal properties (thermal conductivity, thermal diffusivity, volumetric heat capacity, coefficient of linear thermal expansion) at atmospheric and reservoir thermobaric conditions. The new thermal core logging technique provides continuous high-resolution profiling rock thermal properties along wells accounting for rock anisotropy and multi-scale heterogeneity. Integration of the technique application results with standard well logging data leads to possibilities of high resolution profiling porosity, rock matrix thermal properties, elastic wave velocities and modulus, rock density, etc. New approaches are described that allow indirect determination of the reservoir thermal properties from standard petrophysical logging data accounting for formation anisotropy. A new laser optical scanning instrument, enhanced theoretical modeling of effective thermal properties and special workflow opened a way to determination of combination for rock thermal properties on rock cuttings at formation temperatures. The new experimental basis improves reliability of data on physical properties of reservoirs, results of specific heat flow determination and reservoir thermal regime modeling within prospecting, exploration and development of geothermal energy fields.

Geochemical characteristics of terrestrial organic matter in the Upper Paleozoic complex of the Vilyui syneclise and some features of its transformation under thermobaric conditions at great depths

A combination of geochemical methods were used to study organic matter from Permian rocks in the central part of the Vilyui syneclise (East Siberia) penetrated by the Srednevilyuiskaya-27 ultra-deep well in the depth range of 3370-6458 m. This study discusses variations in the pyrolysis indices (HI, Tmax), hydrocarbon type content (hydrocarbons-resins-asphaltenes), vitrinite reflectance (R0vt, %), organic carbon content (Corg), as well as some trends in the saturated and aromatic hydrocarbon compositions of bitumen extracts from the Upper Paleozoic rocks. Below a depth of about 4.5 km (late mesocatagenesis), the hydrocarbon type composition is characterized by a sharp decrease in the content of asphaltenes from < 30 % (at 4.5-5.0 km) to < 15 % (at 5.0-5.5 km), which are not detected at greater depth. In turn, the resins became the dominant constituent (~ 50-70 %), whereas hydrocarbons account for < 20 % at depths down to 5 km and < 40 % at greater depth. These depths are also characterized by a predominance of saturated hydrocarbons over aromatic compounds with a decrease in the relative contents of high molecular weight compounds in both fractions, as indicated by mass chromatograms. The hydrocarbon index (HI) of organic matter decreases to the first tens from the depth of 4.9 km and to the bottomhole (6519 m); the temperature of the maximum hydrocarbon yield (Tmax) varies between 570-580 °C, showing a slightly increasing trend. Our results show that the generative potential of organic matter from the rocks within the studied depth range (4.9-6.5 km) has been exhausted and that the terrestrial organic matter undergoes significant changes under severe temperature and pressure conditions at great depths.

Fate of Hydrocarbons in Iron-Bearing Mineral Environments during Subduction

Subducted sediments play a key role in the evolution of the continental crust and upper mantle. As part of the deep carbon cycle, hydrocarbons are accumulated in sediments of subduction zones and could eventually be transported with the slab below the crust, thus affecting processes in the deep Earth’s interior. However, the behavior of hydrocarbons during subduction is poorly understood. We experimentally investigated the chemical interaction of model hydrocarbon mixtures or natural oil with ferrous iron-bearing silicates and oxides (representing possible rock-forming materials) at pressure-temperature conditions of the Earth’s lower crust and upper mantle (up to 2000(±100) K and 10(±0.2) GPa), and characterized the run products using Raman and Mössbauer spectroscopies and X-ray diffraction. Our results demonstrate that complex hydrocarbons are stable on their own at thermobaric conditions corresponding to depths exceeding 50 km. We also found that chemical reactions between hydrocarbons and ferrous iron-bearing rocks during slab subduction lead to the formation of iron hydride and iron carbide. Iron hydride with relatively low melting temperature may form a liquid with negative buoyancy that could transport reduced iron and hydrogen to greater depths.

Peculiarities of geological and thermobaric conditions for the gas hydrate deposits occurence in the Black Sea and the prospects for their development

The actuality has been revealed of the necessity to attract the gas hydrate depos- its of the Black Sea into industrial development as an alternative to traditional gas fields. This should be preceded by the identification and synthesis of geological and thermobaric peculiarities of their existence. It was noted that the gas hydrates formation occurs under certain thermobaric conditions, with the availability of a gas hydrate-forming agent, which is capable of hydrate formation, as well as a sufficient amount of water necessary to start the crystallization process. The gas hydrate accumulation typically does not occur in free space – in sea water, but in the massif of the sea bed rocks. The important role in the process of natural gas hydrates formation is assigned to thermobaric parameters, as well as to the properties and features of the geological environment, in which, actually, the process of hydrate formation and further hydrate accumulation occurs. It was noted that the source of formation and accumulation of the Black Sea gas hydrates is mainly catagenetic (deep) gas, but diagenetic gas also takes part in the process of gas hydrate deposits formation. The main component of natural gas hydrate deposits is methane and its homologs – ethane, propane, isobutane. The analysis has been made of geological and geophysical data and literature materials devoted to the study of the offshore area and the bottom of the Black Sea, as well as to the identification of gas hydrate deposits. It was established that in the offshore area the gas hydrate deposits with a heterogeneous structure dominate, that is, which comprises a certain proportion of aluminosilicate inclusions. It was noted that theBlack Sea bottom sediments, beginning with the depths of 500 – 600 m, are gassy with methane, and a large sea part is favourable for hydrate formation at temperatures of +8...+9oC and pressures from 7 to 20 MPa at different depths. The characteristics of gas hydrate deposits are provided, as well as requirements and aspects with regard to their industrialization and development. It is recommended to use the method of thermal influence on gas hydrate deposits, since, from an ecological point of view, it is the safest method which does not require additional water resources for its implementation, because water intake is carried out directly from the upper sea layers. A new classification of gas hydrate deposits with a heterogeneous structure has been developed, which is based on the content of rocks inclusions in gas hydrate, the classification feature of which is the amount of heat spent on the dissociation process.

The Origin of Asphaltenes and Main Trends in Evolution of Their Composition During Lithogenesis

The composition and structure of bitumenoid asphaltenes of modern and fossil sediments has been studied using a set of instrumental methods (elemental and X-ray diffraction analyses, visible spectroscopy, NMR spectroscopy, EPR, electron microscopy), which made it possible to trace the evolution of the asphaltenes from their generation in diagenesis to degradation and transformation into kerogen under high catagenesis conditions. In diagenesis, protoasphaltenes are formed, which turn into asphaltenes as a result of catagenetic transformations. In apocatagenesis under severe thermobaric conditions at great depths, despite an overall decrease in bituminosity, the amount of hydrocarbons increases as a result of degradation of asphaltenes: molecules of organic compounds (occluded hydrocarbons) could be trapped and preserved in large cavities of the macromolecular structure of asphaltenes. Three generations of asphaltenes have been distinguished: early diagenetic (protoasphaltenes of modern sediments), mesocatagenetic (asphaltenes formed in the main catagenesis zone), and late catagenetic (asphaltenes produced under conditions of high temperatures and pressures).

The Experimental Research of Mechanical Properties of Rocks in Thermobaric Conditions

Oil and gas account for 60% of the energy balance of Ukraine. These energy carriers have received the greatest public attention in recent years. The supply of fuel resources and their price level have a significant impact on the living standards of the population, considering that in Ukraine the consumption of natural gas alone makes up about 41% of all energy consumed, which is almost twice the European average. According to the Energy Strategy, the annual use of natural gas in Ukraine should be reduced to 49.5 billion m3 by 2030. The dynamics of natural gas consumption in Ukraine shows that the total annual needs for this type of fuel will remain at the level of 70-75 billion m3 for several years. This is due primarily to the adaptability of industry and utilities to the use of natural gas. Their conversion to consuming other fuels requires both long time and considerable costs. Historically, energy traditions also contributed to this. Ukraine was one of the first in the world to start producing oil and gas. In the 1920s, the first gas pipelines from Precarpathia carried the energy of life to Lviv, and later to Kyiv and Moscow. Thanks to the discovery of new fields and the use of efficient technologies, the maximum production of natural gas in Ukraine - over 68 billion m3 per year - was reached in the 1970s. At that time, the gas industry of Ukraine, in addition to its own needs, provided gas to Belarus, Moldova, partly to Russia and the Baltic republics. At present, Ukraine supplies only 25% of its own gas. It is possible to increase the production of own gas in Ukraine by developing of shale deposits. Their development requires the drilling of inclined and horizontal wells. The main complication which occurs when drilling such wells in clay deposits is a integrity damage of their wellbore. To prevent this, various methods are often used in order to increase the mechanical strength of the rocks that make up the walls of the wells and to increase their water resistance. It is suggested to inject fuel-bitumen fluid into the rock. Its effectiveness has been studied under thermobaric conditions on rock models and core samples. These conditions were simulated using the designed laboratory facility. The efficiency of the fuel-bitumen fluid use is due to the speed of its filtration, which is determined by the size and number of pores and cracks in which it occurs. Therefore, it is advisable to inject the fuel-bitumen fluid into clay rocks to strengthen the well walls.

Formation of iron hydride and iron carbide from hydrocarbon systems at ultra high thermobaric conditions

The chemical interaction of hydrocarbon systems and iron-bearing minerals was investigated under extreme thermobaric conditions, corresponding to the Earth upper mantle. As a result of the reaction, the formation of iron carbide and iron hydride was detected. The experiments were carried out in diamond anvils cells with laser heating. Natural petroleum from the Korchaginskoe deposit and a synthetic mixture of paraffin hydrocarbons were used as hydrocarbon systems, and pyroxene-like glass and ferropericlase (57Fe enriched) as iron bearing minerals. The experiments were carried out in the pressure range of 26–95 kbar and temperature range of 1000–1500°C (±100°C). As a result of the experiments, the formation of iron hydride was detected at pressure of 26–69 kbar (corresponds to a depth of 100–200 km), and a mixture of iron carbide and iron hydride at pressure of 75–95 kbar (corresponds to a depth of 210–290 km). The formation of hydrides and iron carbides as a results of the interaction of hydrocarbon systems with iron-bearing minerals may indicate the possible existence of these compounds in the upper mantle.

Formation of Iron Hydride and Iron Carbide from Hydrocarbon Systems at Ultra-High Thermobaric Conditions

Abstract—The chemical interaction of hydrocarbon systems and iron-bearing minerals was investigated under extreme upper mantle pT conditions. As a result, the formation of iron carbide and iron hydride was detected. The experiments were carried out in diamond anvil cells with laser heating. Natural crude oil from the Korchaginskoe deposit and a synthetic mixture of paraffin hydrocarbons were used as hydrocarbon systems and pyroxene-like glass and ferropericlase (57Fe enriched) were used as iron-bearing minerals. The experiments were carried out in the pressure range of 26–95 kbar and the temperature range of 1000–1500°C (± 100°C). The formation of iron hydride was detected at pressure of 26–69 kbar (corresponds to a depth of 100–200 km), and a mixture of iron carbide and iron hydride is formed at pressure of 75–95 kbar (corresponds to a depth of 210–290 km). The formation of iron hydrides and carbides through the interaction of hydrocarbon systems with iron-bearing minerals may indicate the possible existence of these compounds in the upper mantle.

Results of experimental studies into the dynamics of mass-exchange processes during synthesis of propane hydrate

Design diagram of experimental setup for studying the mass exchange processes occurring during formation of gas hydrates was presented. A procedure of performing studies and the use of equipment for conducting experiments in a diffusion mode with the use of slow stirrers with submerged and surface arrangement of the impeller, high-speed stirrers and the use of surfactants were outlined. Formulas for determining the specific intensity of mass exchange on the interphase surface were given. The results of full-scale observations of intensity of mass exchange processes have shown that dynamics of mass exchange between gas and water in the mode of free diffusion is well approximated by a power dependence with exponent of –0.8. Quantitative indicators of dynamics of mass exchange on the propane-water interphase surface for various thermobaric conditions were determined. It was shown how intensity of the mass exchange processes decreases when thermobaric conditions enter the hydrate formation zone. It was established that the use of low-speed stirring devices makes it possible to intensify mass exchange on the interphase surface ten or more times compared to the conditions of free diffusion. However, this effect is observed only at long-term stirring. Thus, the use of slow mechanical stirrers with a speed of up to 100 rpm can only be recommended as a means of moving the formed hydrate within the reactor. Experimental studies have proved that the use of a stirrer with an impeller speed of 1,500 rpm can ensure an about 7‒8 times increase in intensity of mass exchange in conditions of hydrate formation. Moreover, the maximum effect is observed at the beginning of mass exchange processes. It was proved that the use of surfactants makes it possible to further intensify the process of hydrate formation by increasing the area of mass exchange surface of gas bubbles in water. The study findings can be used in designing and improving the equipment for gas hydrate synthesis.

Stresses and Temperature Affecting Acoustic Emission and Rheological Characteristics of Rock Salt

Synchronized acoustic emission and strain measurements were carried out in rock salt samples subjected simultaneously to different levels of uniaxial mechanical and incrementally increasing temperature effects. Methodological and hardware support of such measurements is described. Experimental dependences are obtained, which reflect changes in shear strains and acoustic emission activity of samples as functions of time and temperature for different axial stresses. As the stresses increase, rock salt transits to the stage of progressive creep at lower temperatures. The transition to each subsequent stage of the temperature effect is accompanied by an increase in the steepness of shear strains and activity-average acoustic emission. The patterns of changes in these parameters at the stages of steady and progressive creep of rock salt are analyzed. The advantages of using acoustic emission measurements to predict rock salt failure due to progressive creep, as well as their importance for solving the problem on estimating salt rocks properties in real thermobaric conditions for the construction and operation of underground gas storages are noted.

Gas hydrate formation of sulfur dioxide by injection of liquid carbon dioxide into a natural layer saturated with methane and ice

A mathematical model of injection of liquid sulfur dioxide into a natural layer saturated with ice and methane, accompanied by the formation of SO2 gas hydrate on the front surface is presented. The case when the initial state of the system, as well as the pressure and temperature of the injected liquid sulfur dioxide correspond to the thermobaric conditions of the existence of sulfur dioxide gas hydrate is considered. That, the formation of sulfur dioxide gas hydrate occurs on the front surface, coinciding with the surface of methane displacement by sulfur dioxide. In this case, two characteristic zones are formed in the layer. In the first (near) zone the pores are saturated with sulfur dioxide and its gas hydrate, in the second (far) zone it is saturated with ice and methane. The dependences of the temperature and the coordinates of the formation border of sulfur dioxide gas hydrate on the injection pressure are explored. It is established that the injection pressure increase causes the rise in temperature and movement speed of the surface of the formation of sulfur dioxide gas hydrate. It is shown that at sufficiently high values of injection pressure and initial layer temperature, the temperature rises above the ice melting temperature at the formation border of sulfur dioxide gas hydrate. This corresponds to the formation of an intermediate region saturated with a mixture of water and methane. It is determined the dependence of the limit value of the sulfur dioxide injection pressure, above which an intermediate region saturated with a mixture of water and methane appears on the initial layer temperature.

Coiled Heat Exchanger with Small Radius Bent Tubes for Controlled Heat Treatment of High Viscosity Waxy Oil

The necessity of using the controlled heat treatment technology of oil instead of «hot pumping» is substantiated. A number of advantages of the “cold” transportation of oil are presented, as well as the main tasks that need to be solved for the successful usage of the above technology at the trunk oil pipelines. The main drawbacks of the heat exchanging equipment used at the heating and pumping stations of trunk pipelines for non-Newtonian solidifying waxy oils. Particular attention is paid to deposition and accumulation of wax in the flowing part of the equipment as well as the possibility of their safe quickly cleaning. The use of domestic twisted steel heat exchangers based on small radius bent tube is proposed. Constructive advantages of the proposed twisted heat exchangers are compared with the traditionally used equipment - shell-and-tube exchangers with horizontal and U-shaped arrangement of pipes, fully-welded plate heat exchangers, as well as finning air cooling units. For comparison, such technical and economic indicators as heat transfer rate, per surface area of heat exchange, complexity of operation, maintenance and repair, reliability and structural strength under cyclic loads in difficult thermobaric conditions are adopted. The issues of using twisted steel heat exchangers based on small radius bent tubes at trunk pipelines objects are considered taking into account successful experience of application in other industries.

QUANTITATIVE DIAGNOSTICS METHODS FOR ASPHALT-RESIN-PARAFFIN DEPOSITS IN WELLS AND OIL PIPELINES

Background The formation of asphalt-resin-paraffin deposits in oil-producing wells and oil collectors depends largely on the temperature and pressure conditions for transporting the gas-liquid mixture; therefore, monitoring the temperature and pressure at oil producing facilities along the entire length of the facilities becomes relevant. The appearance of organic deposits in the well leads to a change in the speed of movement of the well production, retains its thermal energy, increases the pressure in the pipes. The equilibrium in the «reservoir - well - pump» system changes due to the increase in pressure at the discharge of the submersible electric centrifugal pump. Temperature sensors, installed evenly along the length of the lifting pipe string, provide important information on the temperature distribution in the pipe string without deposits and with deposits. Thermometry during the well operation will show the effect of fluctuations in the dynamic level of the fluid on the formation of sediments, will increase the informational content of measures for the inhibition and removal of sediments from wells. Aims and Objectives: to justify different methods of using pressure and temperature sensors in wells and oil gathering pipelines for evaluating their internal state; show the possibility of thermometry on a stationary basis for the implementation of a quantitative diagnosis of deposits in the tubing string of an oil producing well. Methods The known dependences of the state of the gas-liquid mixture on the thermobaric conditions in the tubing string of the well pipes and the continuity equation of the pipeline products are used. Results A method has been developed to monitor the formation of asphalt-resin-paraffin deposits in a tubing string according to temperature sensors, which are uniformly distributed along the length of the tubing on a stationary basis.