Research progress,key scientific issues,and prospects of segmented fracturing and pressure relief gas drainage technology for coal seam roof horizontal wells [PDF]
The segmented fracturing and pressure relief gas drainage technology in the horizontal well of the coal seam roof is a key means to guide the efficient gas extraction in deep, high gas, soft and low permeability coal seams.Based on this, a full lifecycle
Caiqing LI +7 more
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Study on technology and effect of gas extraction in horizontal well with segmental hydraulic fracture in roof of coal seam in Huainan mining area [PDF]
Huainan mining area is a typical high-gas area, with broken soft coal seam, low permeability, high gas content, and difficulty in extraction. In order to probe into the technical feasibility and gas control effect of the horizontal well for segmental ...
Benliang CHEN +7 more
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Engineering practice of advance gas control for crushed soft coal seams through directional fracturing using a long borehole in the coal seam roof [PDF]
Objective and MethodsThe crushed soft coal seams susceptible to intense coal and gas outbursts exhibit high gas content and pressure. Consequently, during borehole drilling for regional gas pre-drainage in such coal seams, high blowout intensity is prone
Bingyi JIA +3 more
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Mechanisms and collaborative prevention and control techniques for various disasters in coal seam roofs [PDF]
ObjectiveThe multistage sedimentary and tectonic evolution of coal seams in China has led to the formation of environments with the coexistence of multiple disasters including gas outbursts, water inrushes, and rock bursts. To address the chain evolution
Dongdong CHEN +4 more
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Integrated pressure relief technology for rock burst and gas outburst coordinated control in ultra-thick coal seams under spatially isolated rock pillar areas [PDF]
With the increasing depth of coal mining and the complexity of mining technical conditions, some mines are facing dual dynamic disasters of rock burst and coal and gas outburst, which exhibits a mutually coupled inducing trend.
Hu HE +6 more
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Research progress and breakthrough directions of the key technical fields for large scale and efficient exploration and development of coalbed methane in Xinjiang [PDF]
The Xinjiang Uygur Autonomous Region has presented the expected resource conditions and work foundations for a large-scale coalbed methane (CBM) exploration and development, which shows that its CBM resources below the depth of 2000 m are 7.5 trillion m3,
Bo WEI +12 more
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Typical characteristics of deep coal seams with high outburst risk, outburst inducing mechanism and prevention measures [PDF]
Coal mining in China has gradually entered deep levels. With the continuous increase in mining depth, the outburst risk of coal seam has significantly increased, with both the frequency and intensity of outbursts rising noticeably, posing huge challenges
Baiquan LIN, Tong LIU, Wei YANG
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Evolution of broken pressure and fracture morphology in indirect fracturing for broken-soft coal [PDF]
Indirect fracturing using a horizontal well in roof is a promising technology for methane exploitation in broken soft and low-permeability coal seams. Stratum-penetration fracturing and a complex fracture network with good conductivity are two keys for ...
Dijie ZHU +5 more
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Key problems in in-situ pyrolysis of tar-rich coal drilling for extraction of coal-based oil and gas resources [PDF]
, 2023 Tar-rich coal is a special coal resource with the property of oil and gas resources. Developing the oil and gas resources contained in the tar-rich coal is of great significance for ensuring energy security and realizing the goal of "dual carbon".
Dan HE +6 more
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Shiyou jixie, 2012 国外用于页岩气的水平井水力多段压裂技术比较成熟，采用其多段压裂工具勘探开发成本相对较高，而我国至今还没有形成成熟技术。简要介绍了国外具有代表性的威德福、哈利伯顿和贝克休斯公司用于页岩气井裸眼多级分段压裂相关工具及案例，并针对我国油气田的现状，设计了1趟管柱多级分段压裂系统方案。该方案采用自膨胀式封隔器+投球滑套的方式，管柱选用Φ114.3 mm套管，此种完井方式相对于套管固井后再分段压裂的方式可大幅节约成本。试验结果表明，采用自膨胀封隔器完全可以满足国内页岩气开发的需求 ...
曲丛锋 +4 more
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