共查询到20条相似文献，搜索用时 62 毫秒
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《滨州学院学报》2018,(2):73-77
为了研究聚合物浓度和降解时间对原油乳状液破乳的影响,采用石油沥青质四组分测定法,将原油分离成四组分(胶质、饱和分、芳香分、沥青质),并用破乳剂BSA108测定原油及其各组分与煤油混合为油相以去离子水为水相配置的模拟乳状液的破乳性能,研究不同浓度和不同降解时间的聚丙烯酰胺对原油及其各组分配置的乳状液破乳的影响。实验表明原油及胶质、油分、沥青质分别配置模拟乳状液的稳定性大小为:沥青质>原油>胶质>油分,其中沥青质对破乳的影响远远大于其他三组分;随一定分子量的聚丙烯酰胺降解时间的增长以及浓度的升高,破乳难度逐渐降低,但整体上随着聚合物的加入乳状液的破乳难度显著增加。 相似文献
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马汝彦 《河北能源职业技术学院学报》2012,(2):54-56
在小洼油田现有生产条件下,研究集输管网中液体的流动状态,并采用从井口加入药剂的方法,改变原油乳状液相态,达到改变液体与管壁摩擦方式的目的,从而降低乳状液在井筒和集输管路中的摩阻损失,实现减少抽油机、外输泵等设备能量消耗,改善联合站原油脱水条件,降低药剂使用量等积极效果,取得良好的经济和社会效益。 相似文献
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刚体转动惯量的测量是大学物理实验课中的一个重要实验。以这一实验课为例,介绍了Origin7.5软件作直线拟合的方法。在教学过程中发现利用该软件拟合实验数据,学生可以高效率地得到转动惯量的大小。因此,建议在教学中利用该软件处理刚体转动惯量测量的实验数据。 相似文献
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王晓君 《中国石油大学胜利学院学报》2011,25(1)
油田进入开采高含水期后,采出液中稠油、含聚原油比重逐步增加,且采出液多为复杂乳状液,其界面膜强度高,乳状液稳定,加大了采出液处理的难度.为改善采出液的脱水状况,通常在稠油中掺入一定量的稀油以降低原油的黏度,提高油水分离的效率,本文介绍了稠稀混掺在宁海站的试验过程,并对试验结果进行了分析. 相似文献
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用于液体物理特性分析的电容液滴分析仪(英文) 总被引：2，自引：0，他引：2
基于液滴体积的分析原理,结合电容传感测量技术,研制了一种用于分析液体物理特性的新仪器——电容液滴分析仪.采用具有特殊润湿设计的滴头形成液滴,环形电容传感器用于监视液滴的形成.电容传感器由滴头和一个环型极板组成,通过优化设计,取得了很好的线性度,可将液滴的体积精确测量到约2μL,适用于正在形成或已达到平衡的液滴.电容液滴分析仪实时测量的特性使之非常适合高挥发性液滴的测量,因为采用流量表和计量泵等其它方法测量挥发液滴体积是不可靠的.电容液滴分析仪还可用来测量浓度及表面张力.实验发现,电容液滴分析仪对甘油水溶液浓度的响应是线性的,但对乙醇水溶液浓度的响应是非线性的. 相似文献
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含水原油是一种比较稳定的油包水型乳状液,油中的极性基团浓集于油水界面而形成牢固的单分子保护膜。加入破乳剂后,由于破乳剂具有极性,削弱或破坏了油水界面的保护膜,使水滴结合,并迅速长大,直至水从原油中分层脱除,以达到脱水的目的。 相似文献
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借助粒子视频显微镜(Particle Video Microscope,PVM)对水合物高压实验环路中的油包水乳状液混合以及水合物的生成、聚结过程进行了实验研究。结果表明:PVM设备可以清晰、定量、视觉化地检测到水合物的生成结晶过程以及实时颗粒/液滴的粒径分布,并发现随着水合物的不断生成,其水合物颗粒会发生聚结,形成较大的水合物颗粒,随着反应的进一步进行,水合物颗粒粒径会表现为先增大后减小的趋势,这主要是由于水合物生成过程中的颗粒、液滴间的碰撞、聚集使得粒径增大,同时体系中增强的剪切作用和水合物颗粒表面润湿性的减小致使聚集的水合物颗粒又发生破碎所致;再则,实验过程中阻聚剂的加入对油水乳状液具有较好的乳化作用,使其水相较为均匀的分散到连续油相中,形成稳定、均一的乳状液体系,并且其分散相水滴的粒径要较不加剂情况下少;在水合物的形成过程中水合物颗粒间的聚并是导致水合物堵塞管道的主要原因。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献