Optimization and application of sand bailing technology for coalbed methane horizontal wells [PDF]
Objective and Methods Coalbed methane (CBM) horizontal wells face challenges such as sand accumulation in completion strings, pipe wall scaling, and pump sticking, leading to declined CBM production or shutdown of these wells.
Bao’an XIAN +10 more
core +1 more source
The geometric shape of a fourth-order NUAT-B spline curve(4阶NUAT-B样条曲线的几何形状)
Zhejiang Daxue xuebao. Lixue banTo investigate the relationship between spline representation and geometric representation, the geometric shape of the 4th-order non-uniform algebraic triangular B spline (NUAT-B spline) is exploited.
CHEN Haiwei(陈海伟) +2 more
doaj +1 more source
Development of a power recovery-based dynamic loading system for full-size drill rods in coal mines [PDF]
ObjectiveThis study aims to simulate the actual forces applied to drill rods during the borehole drilling for gas drainage from underground coal mines to satisfy the requirements of drill rods’ fatigue tests.
Jie WANG, Jing ZHANG
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Gaoya dianqi针对全钒液流电池（VFB）储能系统在传统恒功率充放电控制下存在的初始电流冲击大和能量利用率低等问题，文中提出一种基于功率自适应的充放电控制策略。该策略通过自适应功率调节机制，动态优化充放电功率轨迹：在充放电初期有效抑制电流冲击，延长电池寿命；在末期则动态调节功率变化速率，使端电压逼近截止电压，拓宽荷电状态（SOC）可用区间，实现深度充放电，避免因触及电压限制而降低利用率。为全面反映电池运行特性，建立了涵盖电气、电化学、流体力学及温度场的VFB多物理场耦合模型，并给出了功率自适应控制策略的控制框图和算法 ...
张红 +5 more
doaj
Research on hole protection technology of screen pipe for hydraulic transportation and automatic butt joint in high position directional borehole [PDF]
Ensuring the stable extraction of high position directional long boreholes in the mining process of working face is the premise of realizing ' replacing the roadway with the boreholes', and the use of screen pipe completion is an effective hole ...
Jinbao ZHANG
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Aerodynamic Drag Characteristics and Optimization Design of Ultra-High Speed Multi-Car in Gravity Energy Storage Shaft [PDF]
[Objective] As a physical energy storage method characterized by both environmental protection and economic efficiency, gravity energy storage is expected to become an important support for the sustainable development of renewable energy in the future ...
Hao LI +7 more
core +1 more source
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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Key technologies and demonstration of unmanned steeply inclined short-wall fully mechanized top-coal caving intelligent mining [PDF]
Since the 14th Five-Year Plan, my China’s coal mine digital intelligence technology has developed rapidly, especially in thin coal seam mining. However, the unmanned intelligent mining technology of steeply inclined short-wall fully mechanized caving is ...
Bin GU +10 more
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Characteristics and prevention and control techniques of typical water hazards in coal mines in Shaanxi Province [PDF]
Shaanxi province is rich in coal resources and is one of the main coal-producing provinces in China, with a coal production of 746 million tons in 2022. Due to the obvious differences in geological and hydrogeological conditions in the coal mining areas ...
Chaofeng LI +7 more
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Current situation and development trend of mechanized shaft driving in frozen shaft [PDF]
In view of the energy occurrence structure of “rich coal, poor oil and little gas” in China, and the situation that coal will occupy the dominant position of energy consumption for a long time,The development history of frozen shaft mechanized drilling ...
Hang DING +6 more
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