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

Bondarenko, Volodymyr; Svietkina, Olena; Lysenko, Roman; Лиу, Баочанг

doi:10.1051/e3sconf/202020101002

Cited by 5 publications

(5 citation statements)

References 19 publications

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“…Gas hydrates are formed at high pressures and low temperatures [7,8]. Gas hydrates can be formed inside pipeline under certain pressure and temperature conditions, slowing or completely stopping the flow of oil and gas.…”

Section: Introductionmentioning

confidence: 99%

Method for determining the starting moment of hydrate formation on the basis of optical effects

et al. 2021

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The problem is analyzed of hydrate formation in the systems of gathering and treating of oil and gas products. The methods are studied for prevention of complications associated with the gas hydrates accumulation in the pipelines and process lines. Attention is focused on the significant material costs to prevent the hydrate formation and ways to reduce them. The necessity of constant laboratory monitoring for reservoir systems at industrial facilities to determine the hydrate formation parameters has been substantiated. The need to improve the method for determining the hydrate formation parameters for complex reservoir systems based on a mixture of hydrate-forming gases has also been proved. The purpose of the work is to improve the research method of reservoir systems immediately at the facilities of products mining and treatment. The peculiarities are analyzed of the method of visual laboratory observation in the study of gas hydrates. During experimental studies, optical effects of image distortion are observed due to the formation of a gas hydrate layer in the form of a film on the interphase surface. The mechanism of their formation, as well as the processes determining them have been substantiated. Based on this effect, a method of fixing the hydrate formation initial stage (beginning of crystal growth – mass crystallization) is proposed. For increasing the informative ability of the obtained images of hydrate formation processes, it is proposed to “paint” them with the help of colored light sources, as well as to regulate the intensity and direction of illumination. A number of photos are presented, which clearly illustrate the processes described in the paper.

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Section: Introductionmentioning

confidence: 99%

Method for determining the starting moment of hydrate formation on the basis of optical effects

et al. 2021

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“…Most natural gas hydrates are formed under the influence of specific thermodynamic conditions (high pressures and low temperatures) and occur in rocks at great depths, in permafrost conditions, on the shelf of seas and oceans. Gas hydrate reserves can be found in Europe, including Ukraine [4], both on the shelf of the Black Sea [5], and in coal beds of deep mines [6,7]. Mine rocks, which are a porous medium, are a reservoir in the pore space of which gas hydrates are formed and stored.…”

Section: Introductionmentioning

confidence: 99%

An approximate approach to estimation of dissociation rate of gas hydrate in porous rock bed

et al. 2021

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Development of deep shelf or onshore gas hydrate fields involves drilling wells with subsequent thermal, decompression or chemical action on the bed. In this case, the radius of thermal or decompression action is limited. As the field develops, recovery efficiency decreases, and necessity arises for drilling a new well that influences the cost of the technology. To determine the rational wells location, it is necessary to predict the advance of the phase transformation rate front into the depth of the bed. In this work, to study the movement dynamics of the gas hydrates dissociation front in a porous layer of rock, the Stefan problem solution is used. The method adequacy is substantiated by comparing the calculated results with known experimental data. The temperature fields are modelled in a porous bed during the methane hydrate dissociation. The temperature field dynamics for 200 days in a porous bed during the methane hydrate dissociation caused by thermal action is shown. The influence of porosity and excess temperature on the dissociation front movement rate is revealed.

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“…Also, the property of gas hydrates to bind large gas volumes in relatively mild conditions allows to consider them as an alternative to traditional technologies of natural gas transportation and storage [5][6][7][8][9]. In addition, a number of technologies have been developed where gas hydrates act as target or intermediate products [5,[9][10][11][12][13][14]. However, gas hydrates have been and still remain a difficult problem in the oil and gas industry, solution of which requires considerable efforts and resources [15,16].…”

Section: Introductionmentioning

confidence: 99%

Research into phase transformations in reservoir systems models in the presence of thermodynamic hydrate formation inhibitors of high concentration

et al. 2021

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Gas hydrates have been and still remain a difficult problem in the oil and gas industry, solution of which requires considerable efforts and resources. In this work, the mechanism of phase transformations at negative temperatures in the formation of the solid phase is preliminarily studied using the reservoir system models consisting of a gas mixture and a solution of gas hydrate formation inhibitor of thermodynamic action with high concentration in distilled water. A system of three-dimensional lighting and image magnification is used to visually detect phase boundaries by creating optical effects. Thus, in the system “inhibitor solution – gas hydrate – gas” in the process of gas hydrate recrystallization in the conditions close to equilibrium, microzones of supercooled water may occur, which in the absence of gas molecules access is crystallized into ice. The result of such solid phase structure formation is its increased stability in nonequilibrium conditions for a relatively long period of time.

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

Cited by 5 publications

References 19 publications

Method for determining the starting moment of hydrate formation on the basis of optical effects

Method for determining the starting moment of hydrate formation on the basis of optical effects

An approximate approach to estimation of dissociation rate of gas hydrate in porous rock bed

Research into phase transformations in reservoir systems models in the presence of thermodynamic hydrate formation inhibitors of high concentration

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