Stimulation of Underground Degassing in Coal Seams by Hydraulic Fracturing Method

Kurlenya, M. V.; Serdyukov, S. V.; Patutin, A. V.; Shilova, T. V.

doi:10.1134/s106273911706303x

Cited by 23 publications

(4 citation statements)

References 7 publications

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“…(1) Previous studies have shown that the displacement of fracture opening mostly ranges from 1.2 mm to 2.2 mm, and the permeability of medium-grained sandstone varies from 70 mD to 100 mD [25][26][27]. In this calculation, the permeability is 100 mD, the fracture opening displacement is 0.002 m. The compressive strength of the main roof is 30.7 MPa, the cohesion is 6.73 MPa, and the internal friction angle is 36°36′.…”

Section: Hydraulic Fracturing Technology and Processmentioning

confidence: 99%

Technology and practice of the roof-caving of hydraulic fracturing in a fully mechanized caving face

Deng

Zhao

et al. 2021

THERM SCI

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A fracture expansion criterion of hydraulic fracturing was suggested to deal with the hard and stable roof control in coal mines. An experiment was designed for the roof control, and the reliability of model was verified. Four different types of fracturing holes and fracturing technology were designed in the setup room, and the hydraulic fracturing in the roof of a fully mechanized caving face was implemented.

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Section: Hydraulic Fracturing Technology and Processmentioning

confidence: 99%

Technology and practice of the roof-caving of hydraulic fracturing in a fully mechanized caving face

Deng

Zhao

et al. 2021

THERM SCI

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“…The effectiveness of gas control indicates that gas pre-extraction can effectively eliminate the problem of gas concentration exceeding the limit in high-gas mine tunnels, and reduce and eliminate the risk of gas outbursts in the mining face from the source [1][2][3]. After years of research and practice, technologies such as hydraulic fracturing, hydraulic cutting, deep hole blasting, and liquid CO 2 fracturing have achieved certain results in transforming formation stress, expanding the pressure relief range and increasing coal seam permeability [4][5][6][7][8]. However, there are still many problems with the technology and process of gas extraction in Chinese mines at present.…”

Section: Introductionmentioning

confidence: 99%

Expansion Characteristics and Creep Test of New Curing Expansion Material for Gas Extraction Boreholes

Jiang,

Bao,

Lei

2024

Processes

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In order to find the optimal expansion effect of a new curing expansion material so that it can better meet the requirements of the efficient sealing of drilled holes, the expansion and creep characteristics of the new curing expansion material were studied. Based on the creep results of graded loading, the Kelvin–Volgt model was selected to analyze its mechanical parameters, and a new “concentric ring” reinforcement sealing method was proposed. Numerical simulation was employed to analyze and discuss the reinforcement radius and depth of the “protective wall rock hole ring” in the “concentric ring” model, and on-site application experiments were carried out in a soft coal seam. The results show that the “concentric ring” reinforcement sealing method can effectively solve the problems of easy collapse and stress concentration instability in the sealing section of soft coal seams, ensuring long-term and efficient sealing of gas extraction boreholes in soft coal seams. When the diameter of the extraction drilling hole is 100 mm, the optimal reinforcement radius for the “protective wall rock hole ring” is 0.16–0.18 m. A reasonable reinforcement depth of the “protective wall rock hole ring” for drilling in soft coal seams is about 0.8–1 times the width of the roadway. In the on-site application process, experimental boreholes using “concentric ring” reinforcement sealing technology did not show any collapse phenomena, and the volume fraction of extracted gas remained above 30% for the first 30 days. Moreover, the gas volume fraction on the 30th and 60th days was 2.5 times and more than 3 times that of bag sealing boreholes using expanded cement, further proving that the sealing quality of boreholes using “concentric ring” reinforcement sealing is higher.

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“…By analogy with oil extraction technologies, it was proposed to use the method of influence on a coal massif by directed hydraulic separation of the seam from the free surface [4]. Subsequently, this method was used in various versions from underground mine workings through existing degassing wells, which is the subject of numerous theoretical and practical studies [10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Study of the Interaction of a Packing Device with a Coal Seam at Interval Hydraulic Fracturing

2020

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The technological scheme of the interval hydrodynamic influence on the coal seam is considered. The design of a double-sided packer is presented, the results of laboratory tests to determine the axial movement of the seals during the interval fracturing are shown. The numerical scheme based on the Finite Element Method has been developed for calculating the stress-strain state of a rock in the vicinity of a well, loaded by internal pressure through packer seals. The pressure acting on the contacts between the seals and the well is calculated, the stress distribution in the geomaterial is investigated.

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Stimulation of Underground Degassing in Coal Seams by Hydraulic Fracturing Method

Cited by 23 publications

References 7 publications

Technology and practice of the roof-caving of hydraulic fracturing in a fully mechanized caving face

Technology and practice of the roof-caving of hydraulic fracturing in a fully mechanized caving face

Expansion Characteristics and Creep Test of New Curing Expansion Material for Gas Extraction Boreholes

Study of the Interaction of a Packing Device with a Coal Seam at Interval Hydraulic Fracturing

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