Development of the Activities for Explosive Gases Removal from the Worked-out Area in Case of Potash Mine Flooding

Kolesov, E.V.; Shalimov, A. V.; Семин, М. А.

doi:10.24000/0409-2961-2019-12-60-65

“…To estimate the duration of the process of removing the gas-air mixture from the worked-out area, as well as to calculate the change in the content of explosive gases in the outgoing stream, a new mathematical model of the degassing process was developed. The basis of this model is the degassing model proposed in [23]. However, we have supplemented it with an empirical time dependence of the volume of flammable gases released, taking into account the altitude of the incoming brine level.…”

Section: Methodsmentioning

confidence: 99%

“…In [23], it was demonstrated that the air resistance of the degassing pipeline and the 'back pressure' of the gas-air mixture in the closed section of the mine do not significantly affect the time it takes to fill the worked-out space with brine. Therefore, the current volume of the unfilled section is linearly dependent on time 𝑡:…”

Section: Methodsmentioning

confidence: 99%

Modeling and Mitigating Gas Hazards during Potash Mine Closure

Kolesov,

Semin,

Starikov

et al. 2024

Preprint

0

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The planned closure of potash mines, achieved through the injection of highly mineralized brines into the worked-out area, is a complex and not fully studied process. A critical concern arises when brines obstruct the aerodynamic connections between the flooded mine's airspace and the atmosphere, potentially leading to the formation of closed cavities where explosive gases can accumulate. To address this hazard, it is imperative to develop systems capable of extracting the gas-air mixture from the unflooded domed portions of the worked-out area. This is the focus of this study, in which we analyze gas-dynamic processes within the potassium mine worked-out area during planned flooding. Two distinct scenarios are examined: the first involves controlled flooding with saturated brines, while the second contemplates flooding resulting from a hypothetical breakthrough of supra-salt strata, leading to the ingress of groundwater into the worked-out area. A novel mathematical model is introduced to predict the evolution of gas-air mixture parameters in the unflooded dome segment of the worked-out area. Utilizing this model, we assess the effectiveness of proposed measures designed to eliminate explosive gases from the worked-out area. Specifically, a pipeline system is proposed for the removal of gases, followed by their dilution below the maximum permissible concentrations in the effluent jet. The findings from this study contribute valuable insights into ensuring the safe and efficient closure of potash mines, shedding light on potential risks and effective mitigation strategies for gas-related hazards during planned flooding.

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“…where 𝛼 = 0.002 kg/m 3 is the aerodynamic drag coefficient of the degassing pipeline, the value of which is calculated using the method described in [24]; 𝐿 = 3900 m is the length of the degassing pipeline; 𝑆 is the cross-sectional area of the degassing pipeline, m 2 ; 𝛱 is the cross-section perimeter of the degassing pipeline, m. In [23], it was demonstrated that the air resistance of the degassing pipeline and the 'back pressure' of the gas-air mixture in the closed section of the mine do not significantly affect the time it takes to fill the worked-out space with brine. Therefore, the current volume of the unfilled section is linearly dependent on time 𝑡: 𝑉 = 𝑉 − 𝑞𝑡.…”

Section: Methodsmentioning

confidence: 99%

Modeling and Mitigating Gas Hazards during Potash Mine Closure

Kolesov,

Semin,

Starikov

et al. 2024

Preprint

0

View full text Add to dashboard Cite

The planned closure of potash mines, achieved through the injection of highly mineralized brines into the worked-out area, is a complex and not fully studied process. A critical concern arises when brines obstruct the aerodynamic connections between the flooded mine's airspace and the atmosphere, potentially leading to the formation of closed cavities where explosive gases can accumulate. To address this hazard, it is imperative to develop systems capable of extracting the gas-air mixture from the unflooded domed portions of the worked-out area. This is the focus of this study, in which we analyze gas-dynamic processes within the potassium mine worked-out area during planned flooding. Two distinct scenarios are examined: the first involves controlled flooding with saturated brines, while the second contemplates flooding resulting from a hypothetical breakthrough of supra-salt strata, leading to the ingress of groundwater into the worked-out area. A novel mathematical model is introduced to predict the evolution of gas-air mixture parameters in the unflooded dome segment of the worked-out area. Utilizing this model, we assess the effectiveness of proposed measures designed to eliminate explosive gases from the worked-out area. Specifically, a pipeline system is proposed for the removal of gases, followed by their dilution below the maximum permissible concentrations in the effluent jet. The findings from this study contribute valuable insights into ensuring the safe and efficient closure of potash mines, shedding light on potential risks and effective mitigation strategies for gas-related hazards during planned flooding.

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Allocation of a deep-lying brine aquifer in the rocks of a chemogenic section based on the data of geophysical well logging and 2D seismic exploration

Danileva

¹

,

Danilev

²

,

Bolshakova

³

2021

PMI

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Advancement in the production of potassium fertilizers is an important strategic task of Russian agricultural industry. Given annually growing production rates, the reserves of discovered potassium-magnesium salt deposits are noticeably decreasing, which creates the need to ensure stable replenishment of the resource base through both the discovery of new deposits and the exploitation of deep-lying production horizons of the deposits that are already under development. In most cases, deposits of potassium-magnesium salts are developed by underground mining. The main problem for any salt deposit is water. Dry salt workings do not require any additional reinforcement and can easily withstand rock pressure, but with an inflow of water they begin to collapse intensively – hence, special attention is paid to mine waterproofing. Determination of spatial location, physical and mechanical properties of the aquifer and water-blocking stratum in the geological section represent an important stage in the exploration of a salt deposit. The results of these studies allow to validate an optimal system of deposit development that will minimize environmental and economic risks. On the territory of Russia, there is a deposit of potassium-magnesium salts with a unique geological structure – its production horizon lies at a considerable depth and is capped by a regional aquifer, which imposes significant limitations on the development process. To estimate parameters of the studied object, we analyzed the data from CDP seismic reflection survey and a suite of methods of radioactive and acoustic well logging, supplemented with high-frequency induction logging isoparametric sounding (VIKIZ) data. As a result of performed analysis, we identified location of the water-bearing stratum, estimated average thickness of the aquifers and possible water-blocking strata. Based on research results, we proposed methods for increasing operational reliability of the main shaft in the designed mine that will minimize the risks of water breakthrough into the mine shaft.

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Development of the Activities for Explosive Gases Removal from the Worked-out Area in Case of Potash Mine Flooding

Cited by 3 publications

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Modeling and Mitigating Gas Hazards during Potash Mine Closure

Modeling and Mitigating Gas Hazards during Potash Mine Closure

Modeling and Mitigating Gas Hazards during Potash Mine Closure

Allocation of a deep-lying brine aquifer in the rocks of a chemogenic section based on the data of geophysical well logging and 2D seismic exploration

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