Characteristics of apparent resistivity of coals with different particle sizes [PDF]
, 2022 The theory and technology of stress released CBM development is a new theory and technology for CBM development of tectonically deformed coals. The research on the apparent resistivity of tectonically deformed coal can provide technical support for the ...
Deyi GAO +3 more
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Experimental investigation on fracture behavior of lignite and its fracturing significance:taking Shengli Coalfield as an example [PDF]
, 2023 The anisotropy of fracture properties at different bedding orientations of lignite plays an important role in controlling the formation of fracture network of reservoir racturing.
Diankun ZHANG +2 more
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北京黄庄—高丽营断裂土壤气体地球化学特征及其对地震活动的指示
Dizhen xuebao, 2023 通过对2017年5月土壤气CO2，Rn和Hg的野外流动测量以及2020年9月1日至2021年6月30日期间土壤气监测站Rn的连续监测，利用残差法和地震指数KS方法对黄庄—高丽营断裂南北段的活动差异和区域地震活动进行了分析。结果表明，与首都圈地区其它断裂相比，黄庄—高丽营断裂是首都圈地区活动性相对较强的活动断裂，断裂北段的土壤气体浓度和通量较南段更高，且北段上盘的CO2和Rn浓度明显高于下盘，指示断裂北段具有更强的活动性。对土壤气连续监测站数据进行分析，结果显示监测站的Rn浓度与气温 ...
Zhaofei Liu +6 more
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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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Dizhen xuebao, 2021 本文采用质点运动判别与偏振分析相结合的方法对2019年四川长宁MS6.0地震震源区10个台站于2013年4月25日至2019年7月31日记录到的波形数据进行S波分裂参数测定，其中9个台站获取4条以上有效S波分裂参数。结果表明，震源区各台站的S波分裂参数不仅在空间上存在分区特征，还会随时间发生改变。快波偏振方向在空间上的分区特征大体为：位于震源区东南段的三个台站的快波偏振优势方向主要为NE向，与震源区东南段的主压应力方向基本一致；位于研究区西北段的台站，其快波偏振优势方向为近EW向 ...
Chunmei Huang +4 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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Shiyou jixie, 2014 非常规油气藏开采难度大，开发成本高，原有的水平井管内分段压裂技术存在分段级数少、压裂规模小等问题，无法满足非常规油气资源高效开发的要求。为此，分析了水平井泵送桥塞、固井投球滑套、连续管拖动封隔器等多级分段压裂新技术，其中，泵送桥塞射孔多级分段压裂技术分段级数不受限制，适合大排量、大液量压裂要求，是页岩油气开发的利器。固井投球滑套分段压裂技术滑套可重复开启，能满足选择性生产、堵水及重复性压裂的需求。各种水平井管内多级分段压裂新技术的成功应用，为非常规油气藏开发提供了强有力的技术支持。
伊西锋
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