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INTRODUCTION Oil and water well is an important basic estab- lishment in oilfields. In many oilfields, there are many different damages in the well’s casing walls after its development for a period of time. They will affect the normal production of damaged wells and adversely influence the neighbouring wells and the block, and threaten steady production. There are different kinds of damages due to multiple problems in the casing walls, for example, corrosion, perforation, decreased diame… 相似文献
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在气液两相流研究中,相分布、相速度等流场特征信息对深入了解流动机理、提高模型计算精度有重要意义,但由于气液流动的复杂性与随机性,使得它们的准确测量较为困难。该研究基于快速电阻层析成像技术,首先对垂直向上气液管流中弹状流流型下多种工况的流动结构进行图像数据采集与重建;然后通过互相关算法得到轴向速度场分布,并与漂移流模型进行对比;再对按时序排列的横截面图像序列进行调整得到正确比例的空间三维图像;最后获得段塞长度、频率等特征信息。结果表明,快速电阻层析成像技术可以测得速度场分布、段塞长度、频率等特征信息,可用于优化与这些参数相关的理论模型和经验关系式,有助于提高气液两相流的模型计算精度。 相似文献
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INTRODUCTION Oil-water-gas multiphase mixed transport in oil pipe is extensively used in ocean oil industries. How to measure the volumetric fractions of oil-water-gas multiphase flow is an important subject of study in the oil industry. Related research work was started in the 1980s. The measurement of component ratios in multiphase flows using γ-ray attenuation was first suggested by Abouelwafa and Kendall (1980), and the technique has been used in many current com- mercial multiphase… 相似文献
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老师对学生的爱是无私的、真诚的、一视同仁的,每个孩子都在老师的爱的教育下成长,尤其是那些存在"问题"的学生和那些需要帮助的学生,更需要老师倾注更多的爱。喜欢优秀的学生是为师者都最愿意做的事,但爱一个"问题"学生才是对教师的考验,向"问题"学生撒播爱的阳光,这也正是教师的天职。"没有爱就没有教育",一个"爱"字道出了教育的全部智慧。为人师者都知道关爱学生,然而不少老师却走入"以罚代爱"的误区,正在遭遇着或遭遇过不少尴尬。如何走出这个误区?笔者根据多年的一线教育教学实践和研究认为:为人师者不仅对学生要有爱,更要有爱的智慧——爱不可"以罚代爱",爱不可"拔苗助长",爱是尽职,爱是尊重,爱是心灵与心灵最微妙的接触,爱是师与生都能感受得到的幸福! 相似文献
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