English translation for "change of oil"

换油

Example Sentences:

	1.	In the light of the interaction of oil ， pipeline and ambient media and their unstable heat transmission ， considering temperature dependent on physical properties and phase change of oil ， a mathematical model for thermal calculation is presented 针对加热原油管道停输后油品、管道及周围介质的相互关系和它们的不稳定传热，提出了热力计算的数学模型。
	2.	This paper presents the calculation formula for determination of reasonable soak time and heated radius at end of soaking by analysis of changes of oil layer and steam energy during soaking period , based on basic theories of reservoir engineering and heat transfer 应用油藏工程、热传递基本理论剖析了焖井过程中油层和蒸汽的能量变化，推导出确定合理焖井时间的计算公式和焖井结束后加热半径的计算公式。
	3.	Since 1970 ’ s , great changes have taken place in world oil market environment . it turns to be fluctuating from a relatively stable status which caused great change of oil enterprise behavior . how the oil enterprises adapt to the fluctuating market environment is our concern 自从上世纪七十年代之后,世界石油市场环境发生了巨大的变化,由原来的相对稳定变为动荡不安,使处于其中的石油企业行为也发生了很大的变化,石油企业如何适应这种动荡的市场环境正是本文所关注的问题。
	4.	Through analyzing the effect of temperature and nitrogen on crude oil viscosity the influences of different nitrogen injection volume and injection modes on steam displacement are contrasted , the mechanism of nitrogen - assisted steam stimulation is clarified , which includes : heat carrying capacity is raised , the saturation of remaining oil is reduced after nitrogen - assisted injection is made ; crude oil flow is enhanced because of nitrogen compression and dispersion and the change of oil flow shape ; water back - production rate is improved by expanding the steam sweep volume and compensating in - situ energy ; steam distillation effect is enhanced 通过分析温度、氮气对原油粘度的影响，对比不同注氮量、不同注入方式等对蒸汽驱油效果的影响，弄清了氮气辅助蒸汽增产的机理主要表现在：氮气辅助后增加携热能力，降低残余油饱和度，氮气的压缩膨胀作用分散和改变了原油流动形态，增强了原油流动性；扩大蒸汽的波及体积，补充地层能量，提高回采水率，强化蒸汽蒸馏效应。
	5.	Lastly , experimentations are carried out on chaochai 6102bq engine and the data of the thermal parameters according to different oil - apply lead angle is derived . the influence of the change of oil - apply lead angle on the rate of heat release is researched , then a reference is provided for building an accurate heat release model 最后，在朝柴6102bq柴油机台架上进行了试验，对不同供油提前角下柴油机的热工参数进行实机测试，对试验结果进行了处理、分析，研究了供油提前角的改变对放热规律的影响，为建立该故障下的燃烧放热模型提供参考。
	6.	Currently most domestic break - test - plateform adopt the liquid - pressure - servo technique , which possesses the advantages of higher frequency - response and higher controlling exactness , but in the same time , the disadvantages of higher cost , variation of function with the change of oil viscousness produced by the fluctuation of temperature . moreover , the liquid - pressure system is sensitive to the pollution of oil , so it is necessary to take protective and filtrating steps 目前，国内的制动器试验台大多采用的是液压伺服控制，这种控制具有响应频率高、控制精度高等优点，主要缺点是系统成本高、油液粘度随温度变化引起工作性能的变化、且液压系统对油液的污染比较敏感，必须要有良好的保护和过滤措施。

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