Implementation of underground longhole directional drilling technology for greenhouse gas mitigation in Chinese coal mines

Wang, Fangtian; Ren, Ting X; Tu, Shihao; Hungerford, Frank; Aziz, Naj

doi:10.1016/j.ijggc.2012.09.006

Cited by 109 publications

(43 citation statements)

References 11 publications

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“…The specimens were processed from homogeneous sandstone cut into cubes of 300ˆ300ˆ300 mm 3 . A diamond-tipped drill bit was used to drill a center hole from the upper surface into the cube, and then an abrasive water jet nozzle was inserted to erode the sandstone at the bottom of the center hole.…”

Section: Specimen Processingmentioning

confidence: 99%

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Experimental Study of Crack Initiation and Extension Induced by Hydraulic Fracturing in a Tree-Type Borehole Array

Zuo

et al. 2016

Energies

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High-pressure hydraulic fracturing technology in coal and coal bed methane mines can lead to roof and floor damage, and fracture initiation disorder that leads to a "blank area", and other issues. A new method of hydraulic fracturing is proposed to increase the homogeneous permeability of coal in underground coalmines. Numerical and other simulation tests for different forms of a tree-type, branched borehole model are presented. The results show that the branched array causes cracks to initiate from the bottom of the array, and these extend along the direction of the adjacent boreholes. Generally, as the number of branched boreholes increases, the coal seam fracture network also increase, improving the distribution of the fracture network, making the fracturing effect better. The branched boreholes appear to reduce initiation pressure and, with increasing branches, the initiation pressure decreases. A model with four tree-type, branched boreholes leads to a reduction in initiation pressure of 69%. In terms of permeability improvement technology in underground coalmines, a branched hydraulic fracturing borehole array has the advantages of reducing initiation pressure, controlling crack initiation and extension, enhancing the fracturing effect and reducing the destruction of the roof and floor.

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Section: Specimen Processingmentioning

confidence: 99%

“…Coal bed methane also poses a major risk to the safety of coal production [1][2][3]. Further, with increasing mining depth, the characteristics of high gas content in the coal seams and low permeability increase significantly, and thus hydraulic fracturing becomes increasingly important.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Crack Initiation and Extension Induced by Hydraulic Fracturing in a Tree-Type Borehole Array

Zuo

et al. 2016

Energies

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“…However, the coal mines in the Huainan mine area are characterized by complex geological structures, great depths (800-1500 m), high in situ water and gas pressure (greater than 6.2 MPa), high gas content (12-26 m 3 /t), soft coal mass (rigidity coefficient about 0.2-0.8), and low permeability (0.001 mD). Gas extraction in such geological conditions remains a problem worldwide (Wang et al, 2012). Historically, the Huainan mine area was known as a 'disaster zone' in the Chinese coal industry due to the frequent gas extraction accidents.…”

Section: Number Of Accidents Casualtiesmentioning

confidence: 99%

Statistical analysis of coal mining safety in China with reference to the impact of technology

Chu¹,

Jain²,

Muradian³

et al. 2016

J. S. Afr. Inst. Min. Metall.

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“…Therefore, coal mine methane drainage and utilization promotes mining safety, recovers methane resources, and reduces GHG emissions (Chen and Cheng 2015;Bibler et al 1998;ECE 2010;ESMAP 2007;Karacan et al 2011;Keim et al 2011;Tu and Chen 2002). Globally, CMM drainage and usage is attracting increasing attention in major coal-producing countries, such as the USA, Australia, and China (Bibler et al 1998;Kirchgessner et al 2002;Wang et al 2012;Yang 2009). …”

Section: Introductionmentioning

confidence: 99%

Quality and quantity of pre-drainage methane and responding strategies in Chinese outburst coal mines

Zhang

Dai

2016

Arab J Geosci

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Coal and gas outburst and gas explosion are most important coal mine disasters throughout the world. Predrainage is widely accepted and performed to prevent and control methane-related disasters in Chinese outburst mines. Boreholes for pre-drainage are drilled directly into the outburst-prone seams and are theoretically able to capture most of the seam gas that has a high concentration of CH 4 . The methane drainage practice in the Huaibei coalfield suggests that high-outburst mines achieved better efficient during pre-drainage and better effects in methane use than the other outburst mines. This implies that pre-drainage was primarily implemented to eliminate the outburst hazards of outburstprone seams and not to recover methane resource and reduce methane emissions in China. This idea resulted in a greater emphasis on the quantity rather than the quality of predrainage methane, and even the quantity of pre-drainage methane itself was not sufficient in eliminating outburst hazards. This idea and related policies on methane drainage should be transformed urgently. Methane pre-drainage can be greatly improved by making full use of those unavoidable intense boreholes. It is suggested that operating a highefficiency drainage system and developing or popularizing high-efficiency techniques, materials, and equipment for borehole sealing can improve the quality of pre-drainage methane. Simultaneously, extending the pre-drainage time by cooperating with artificial channels can produce the fullest potential of intense boreholes and maximize the quantity of pre-drainage methane. These efforts would benefit the overall mine safety, mine productivity, and methane resource exploitation and usage, as well as the environmental impact, particularly with regard to greenhouse gas emissions.

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Implementation of underground longhole directional drilling technology for greenhouse gas mitigation in Chinese coal mines

Cited by 109 publications

References 11 publications

Experimental Study of Crack Initiation and Extension Induced by Hydraulic Fracturing in a Tree-Type Borehole Array

Experimental Study of Crack Initiation and Extension Induced by Hydraulic Fracturing in a Tree-Type Borehole Array

Statistical analysis of coal mining safety in China with reference to the impact of technology

Quality and quantity of pre-drainage methane and responding strategies in Chinese outburst coal mines

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