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相关概念视频

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft01:23

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft

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Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular velocity...
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Types of Fluids01:27

Types of Fluids

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Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and...
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Multiple Pipe Systems

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Multipipe systems consist of complex configurations of interconnected pipes designed to transport fluids efficiently across intricate networks. They are essential in engineering applications requiring precise control over flow distribution, pressure, and head loss. They are categorized into series, parallel, loop, and network configurations, each distinguished by unique flow characteristics and applications.
Series Configuration
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Fluid Pressure over Flat Plate of Constant Width01:05

Fluid Pressure over Flat Plate of Constant Width

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When a body is submerged in water, it experiences fluid pressure acting normal on its surface and distributed over its area. For better design structures, it is crucial to determine the magnitude and location of the resultant force acting on the surface. In the case of a rectangular plate of constant width submerged in water, the pressure increases with depth, resulting in a linearly varying trapezoidal pressure distribution from the upper to the lower edge of the plate.
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开发和应用一个连接式无固体钻井流体系统.

Gang Xiang1,2, Jianghai Zou1,2, Lingyun Zhao1,2

  • 1Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas, Ministry of Natural Resources, Guiyang 551400, China.

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概括

一个新的无固体钻井流体系统通过防止崩和损坏,有效地稳定了煤床甲井. 开发的AMSN增强了流体特性,减少了井口扩大,并提高了具有挑战性的形成中的质量.

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科学领域:

  • 地质学和石油工程 石油工程
  • 材料科学 材料科学 材料科学
  • 流体力学 流体力学 流体力学

背景情况:

  • 吉纳煤场拥有具有复杂煤体特征的煤床甲 (CBM) 资源.
  • 在上层有煤矿构成的钻井面临着井口不稳定性问题,如裂变和崩.
  • 在CBM钻井中,水库损坏机制需要有效的缓解策略.

研究的目的:

  • 调查CBM钻探中的储损伤机制.
  • 开发一种无固体钻井液系统,以提高井口稳定性.
  • 为了优化流体损失的降低和密封能力在CBM的形成.

主要方法:

  • 使用X射线衍射 (XRD) 和扫描电子显微镜 (SEM) 进行核心分析.
  • 在煤和相邻层核心上进行水化稳定性和机械性质测试.
  • 开发和描述一种新的流体损失减小剂和粘性剂 (AMSN).
  • 沙床堵塞试验和钻井流体系统的风学性质评估.

主要成果:

  • 高分子量聚合物AMSN形成一个稳定的3D网络,增强粘度和耐热性.
  • 开发的钻井流体系统显示出出色的堵塞能力 (0mL过量) 和滑性.
  • 现场应用证实了井口扩张的减少和易崩的煤层的固质量的提高.

结论:

  • 开发的塞式无固体钻井流体系统有效地提高了CBM井的井口稳定性.
  • AMSN显著改善了流体损失控制,密封性和耐热性,这对于CBM钻探至关重要.
  • 优化的系统减轻了煤层损坏,提高了整体钻井效率和井完整性.