Substantiation of parameters of coal unloading process onto conveyor using shearer drums

Xuan, Nguyen Van; Gabov, V. V.; Lykov, Y. V.

doi:10.1088/1755-1315/194/4/042019

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…In this case, at a given capacity it ensures the required particle size distribution, the lowest specific energy consumption and the amount of explosive dust generated in the process. One possible solution can be the selective methods of coal separation from the massif performed by unified extraction modules (UEM) [14], which can work as part of front modular complexes both in long and short bottoms, for example, in the development of pillars and other areas with limited reserves. A distinctive feature of these machines is the UEM placed on each section of a mechanized support, through the section, or on a special base.…”

Section: Figure 2 Cutting Force Dependencies On Shear Angle To the Di...mentioning

confidence: 99%

Fractured-Laminar Structure of Formations and Methods of Coal Loosening

Gabov

Задков

Kuzkin

et al. 2020

KEM

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The paper analyzes the structure of coal beds. It is noted that coal beds belong to laminar massifs with characteristic oriented structure and pronounced anisotropy of strength properties, and include rock layers and consolidated hard inclusions. The quality criteria of the coal loosening process are highlighted. A selective method of separating coal from a massif by cutting along weakened surfaces is proposed as an alternative to the existing combine technology with continuous cutting of a massif from the surface.

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Section: Figure 2 Cutting Force Dependencies On Shear Angle To the Di...mentioning

confidence: 99%

Fractured-Laminar Structure of Formations and Methods of Coal Loosening

Gabov

Задков

Kuzkin

et al. 2020

KEM

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“…These molecules contain some cyclic and aromatic hydrocarbons. Paraffin wax can exist in different phases, either gas, liquid, or solid, subject to the temperature and pressure of a specific condition [10][11][12][13]. At temperatures bellows the wax appearance temperature, hereinafter referred to as the WAT, crystals of organic wax will form either in the bulk fluid or on cold surfaces of equipment, consequently fouling the surface.…”

Section: Introductionmentioning

confidence: 99%

An extensive solution to prevent wax deposition formation in gas-lift wells

Nguyen¹,

Александров²,

Рогачев³

2022

J Appl Eng Science

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In recent years, an insurmountable problem in high-wax oil production has been the intensive formation of organic deposits in the bottom-hole zone of the formation, downhole and surface equipment, leading to a dramatic loss in wells production, transportation capability, and subsequently has a detrimental effect on efficiency. Gas-lift is a widely used method, where compressed high-pressure gas is injected through the tubing annulus. Consequently, the current fluid level in the annulus decreases and increases in the tubing string. The compressed gas enters the tubing through gas-lift valves, mixing with the liquid. During production, changes in pressure, temperature, and fluid composition along the well bore highly depend upon the compressed gas injected into the well. At temperatures below the wax appearance temperature, organic wax crystals will form either in bulk volumes of fluid or on cold surfaces of equipment, consequently, covering the surface. Wax formation is a hazardous and costly task in the oil and gas industry, especially when operating gas-lift wells. Hence, the prevention of wax formation in gas-lift wells is of utmost importance. Although, numerous methods have been implemented to handle the wax formation problem in recent decades, questions concerning their economic viability as well as their effectiveness remain relevant. In this paper, a complete algorithm for determining changes in the oil component composition in a gas-lift well during the injection of associated petroleum gas is detailed. The obtained results play a pivotal role in the study of wax deposition. A technological scheme has been developed to prevent wax deposit formation in the tubing strings during gas-lift well operation. A simulation using the introduced process and technology has been run, and an observed result obtained. After running the simulation, we determined the optimal composition of the associated petroleum injection gas based on the required flow rate of the working agent and the lowest value of the wax appearance temperature. This method offers potential solutions to increasing gas-lift well production efficiency under complex wax formation conditions.

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“…Over the past few decades, the gas-lift method of well operation has been one of the most effective methods in developing offshore oil and gas fields [1][2][3]. The high-wax oil production of offshore fields in Vietnam (White Tiger, White Bear, Dragon) is accompanied by severe problems due to the intensive formation of organic deposits in the downhole and surface oil and gas field equipment [4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Technology for Preventing the Wax Deposit Formation in Gas-Lift Wells at Offshore Oil and Gas Fields in Vietnam

2021

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Within the past few decades, the production of high-wax oils at offshore fields in Vietnam has been fraught with severe problems due to the intense formation of asphalt-resin-paraffin deposits (ARPD) in the downhole oil and gas equipment. The formation of organic wax deposits in the tubing string led to a significant decrease in gas-lift wells production, efficiency of compressor units, transport capacity of the piping systems, along with an increase in equipment failure. Subsequently, the efficiency of gas-lift wells dramatically decreased to less than 40% as a whole. The existing methods and technologies for combating organic wax deposit formation in downhole equipment have many advantages. However, their use in producing high-wax anomalous oil does not entirely prevent the wax formation in the tubing string and leads to a significant reduction in oil production, transport capacity, and treatment intervals. The results of theoretical and experimental studies presented in this article demonstrate that a promising approach to improve the efficiency of gas-lift wells during the production of high-wax oil is to use the technology of periodic injection of hot associated petroleum gas (APG) into the annulus of an oil-producing well. The effectiveness of the proposed method of combating wax formation in gas-lift wells highly depends on the combination of a few factors: the determination of wax deposit formation intensity in the well and the implementation of a set of preparatory measures to determine the optimal injection mode of hot APG (flow rate and injection depth) into the annulus between tubing strings and technological pipes. The injection depth of the hot APG should not be less than the depth of wax formation in the tubing string. The optimal injection rate of hot APG is determined by analyzing and mathematically modeling the APG injection system based on well-known thermodynamic laws.

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Substantiation of parameters of coal unloading process onto conveyor using shearer drums

Cited by 4 publications

References 2 publications

Fractured-Laminar Structure of Formations and Methods of Coal Loosening

Fractured-Laminar Structure of Formations and Methods of Coal Loosening

An extensive solution to prevent wax deposition formation in gas-lift wells

Technology for Preventing the Wax Deposit Formation in Gas-Lift Wells at Offshore Oil and Gas Fields in Vietnam

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