Results 21 to 30 of about 6,092 (204)
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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Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT TA18 alloy is an ideal material for piping systems in the aerospace field, the low notch sensitivity and high damage tolerance enhance its engineering application value. However, the complex failure mechanism influenced by strain gradient necessitates further improvement of the service stability for TA18 alloy in practical engineering ...
Xin Du +6 more
wiley +1 more source
Influence of fracturing reconstruction of coalbed methane wells on gas production and development suggestions in Guizhou Province: taking Panguan syncline as an example [PDF]
In Guizhou Province, there are many coal-bearing structural units, many layers of coal, thin thickness, and most of them are low permeability reservoirs, so it is advisable to adopt the process of “staged fracturing and combined layer drainage and ...
Haiyang HU +6 more
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Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Enhancing the strength of 7000 series high‐strength Al alloys remains a critical challenge to meet the demands of increasingly demanding service environments. In this study, a novel approach is proposed for developing high‐performance Al alloys through a combination of powder mechanical alloying, powder press‐forming, rolling deformation, and ...
Peng‐Fei Ji +4 more
wiley +1 more source
Gaoya dianqi, 2019 介绍了中国油气开采工程中使用的各种压裂技术优缺点,根据工程需要提出了电弧压裂技术,分析了电弧压裂技术的工作原理以及国内外研究现状,并对目前电弧压裂工程应用进行了分析,总结了电弧压裂技术对油气储层的适用性。根据目前电弧压裂装置深井下高温高压的作业难点,并提出了井下压裂工具改进的实施方案和大面积储层改造的思路,为电弧压裂技术的发展提供工程应用参考。
鄢宇杰 +4 more
doaj
Experimental on N2 foam fracturing characteristics of tight siltstone in coal measures [PDF]
Foam fracturing with low water consumption, low reservoir damage and high flowback efficiency is one of the potential technologies for the development of low-pressure, low-permeability and strong water-sensitive coal measures reservoirs.
Hecheng XIAO +4 more
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Politics &Policy, Volume 52, Issue 4, Page 801-827, August 2024.Abstract Political competition accelerates the enactment of lesbian, gay, bisexual, trans*, and intersexual rights (LGBTI+) due to the dynamic, rational behavior of mainstream parties across the political aisle to adapt to the sociopolitical environment.
Joel Cantó, Javier Arregui
wiley +1 more source
Shiyou jixie, 2012 水平井分段压裂技术是水平井增产改造的重要技术。该技术可在第1层压裂结束后，投球加压，使滑套下移，将下面一层关闭，露出第2层喷砂循环孔，开始第2层压裂，实现不动管柱多层压裂。在介绍水平井分段压裂技术关键工具结构及性能的基础上，以水平5-1井为例，对该技术的应用情况进行了介绍。应用结果表明，封隔器分段压裂技术分段准确、施工方便，对开发低渗透油藏具有良好效果。建议进一步开展压裂工具的优化设计和不动管柱封隔器分段压裂技术研究。
孙骞 +4 more
doaj
Shiyou jixie, 2014 对压裂球进行受力分析和地面承压测试是开发高性能压裂球的关键。采用有限元数值模拟方法对压裂球进行了受力分析，研究了不同压力对压裂球内应力和塑性变形区域的影响规律，并通过承压试验测试了压裂球的承压性能。为了模拟真实的密封过程，选择显式动力方法定义分析步，在整个过程中认为球座无变形。分析结果表明，压裂球在不同压力载荷下的应力集中区域为球与球座接触区，随着压力的增大，应力集中区和塑性变形区逐渐向球心延伸；当压力超过110 MPa时，压裂球最大应力值已经接近材料的应力极限。
左争云 +3 more
doaj
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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