Structural, tectonic and fluid-dynamic aspects of deep degassing of the black sea megatrench

Коболев, В.П.

doi:10.15407/mining11.01.031

Cited by 14 publications

(6 citation statements)

References 10 publications

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“…It is the northeastern segment of the Mediterranean mobile zone. In the north, these two depressions border on the southern edge of the Eastern European platform, in the east -with the zone of the Taman dome structures, is the western extension of the Caucasian orogen, in the south -with the Anatolian folded structures, in the west -with the Misei plate and Dobrudja mining structures (Kobolev, 2017).…”

Section: Mining-geological Features Of Gas Hydrate Deposits Occurrence In the Black Seamentioning

confidence: 99%

Thermodynamic and geomechanical processes research in the development of gas hydrate deposits in the conditions of the Black Sea

Bondarenko¹,

Sai²,

Prokopenko³

et al. 2018

Min. miner. depos.

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Purpose. Research of thermodynamic and geomechanical processes occurring in a gas hydrate body under the influence of an activating agent (sea water from surface layers) in the conditions of the Black Sea by mathematical modeling using finite element method.Methods. The modeling of thermodynamic and geomechanical processes is performed with the use of ANSYS v17.0 software and in accordance with the climatic, hydrogeological and physic-mechanical properties of the numerical model elements in the Black Sea gas hydrate deposit under consideration, which are similar to natural ones. The thermodynamic processes were studied in the section "Steady-State Thermal", and the geomechanical (stress-strain state) in "Static Structural".Findings. The spatial model is developed, which allows to simulate thermodynamic and geomechanical processes in a gas hydrate body under the influence of a thermal agent. As a result of modeling, it was determined that under these conditions the temperature in the gas hydrate body varies with the distance from the production well similarly in both directions according to the polynomial dependence. What is more, at a distance from the well of 18.7 m the temperature is stable and equals +22°С, and in the range of 18.7 -24.9 m -decreases by 3.1 times and reaches a value of +7°С. It was found out that deformations in a gas hydrate body under the influence of an activating agent, which is fed under pressure above the initial, are directed from the lateral boundaries to the center of the gas hydrate body in the direction of productive dissociation zones. This, in its turn, results in the displacement of the gas hydrate volume to the reaction proceeding center, improving the quality of the decomposition process and allows mining of 87 -91% gas hydrate volume, which is presented in the model. Originality. For the first time, for the conditions of the Black Sea gas hydrate deposits, an analytical assessment of the dissociation zone distribution from the production well under the influence of the thermal agent and the changes of the stress-strain state of the gas hydrated body during its decomposition, has been carried out. This allows to improve the technology of the gas hydrate deposits development in the conditions under consideration.Practical implications. The technological scheme for the development of a gas hydrate body based on the combined approach to the effects of activators (temperature and pressure) is proposed, which eliminates the need to warm the boundary sections of the deposit and increases the amount of the supplied activating agent and its temperatures, which in its turn leads to a decrease in the resource-and energy consumption.

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Section: Mining-geological Features Of Gas Hydrate Deposits Occurrence In the Black Seamentioning

confidence: 99%

Thermodynamic and geomechanical processes research in the development of gas hydrate deposits in the conditions of the Black Sea

Bondarenko¹,

Sai²,

Prokopenko³

et al. 2018

Min. miner. depos.

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“…To maintain sustained economic growth, people turn their attention to the ocean [2,3]. Marine mineral resources are prosperous, especially submarine metal nodule deposits, which are extremely large, in which rare metal nodule minerals (such as manganese metal nodules) and gas hydrates are extremely abundant [4][5][6], but most of these minerals are distributed on the seafloor below 4000 m. Therefore, mining is challenging [7,8]. The complex deep-sea environment puts higher requirements on the deep-sea mining system.…”

Section: Introductionmentioning

confidence: 99%

Study on an Analytical Solution to the Mechanical Response of Soil Cut by a Bionic Force Enhancement Grouser

Chen

Wang

et al. 2021

JMSE

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With the depletion of land mineral resources, people have turned their attention to the sea. As an important part of deep-sea mining systems, the technical research and development of ore collectors has always been a difficult problem in many countries. According to the characteristic that buffalo hoof is suitable for walking on soft soil, a kind of bionic grouser for a deep-sea mining vehicle is designed in this paper. Through the optimization of Rankine’s passive earth pressure theory, the formula for calculating the tractive force of the grouser is obtained. The accuracy of the analytical solution is verified by finite element simulation, and the force enhancement mechanism of the bionic grouser is revealed. The results show that the design of the bionic grouser has a significant effect on the improvement of tractive force, and the tractive force of the No. 1 bionic grouser is 17.52% higher than that of the straight grouser. On this basis, the geometric parameters of the bionic grouser profile are optimized. The results show that when L is 0 mm and R is 183 mm, the force enhancement effect reaches the maximum of 27%, which provides a design basis for optimizing the grouser and improving the mining efficiency of the collector.

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“…The application of GH for storage or transportation has not been industrially exploited so far. However, they constitute one of the most promising directions in the development of hydrate technologies for modern industry [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Study of the formation mechanism of gas hydrates of methane in the presence of surface-active substances

Bondarenko

Svietkina

Sai

2017

EEJET

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Structural, tectonic and fluid-dynamic aspects of deep degassing of the black sea megatrench

Cited by 14 publications

References 10 publications

Thermodynamic and geomechanical processes research in the development of gas hydrate deposits in the conditions of the Black Sea

Thermodynamic and geomechanical processes research in the development of gas hydrate deposits in the conditions of the Black Sea

Study on an Analytical Solution to the Mechanical Response of Soil Cut by a Bionic Force Enhancement Grouser

Study of the formation mechanism of gas hydrates of methane in the presence of surface-active substances

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