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螺杆泵井下结构改进及应用研究 被引量:1
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作者 邵东波 《制造业自动化》 北大核心 2012年第5期151-152,156,共3页
油井地面驱动螺杆泵采油工艺起源于20世纪80年代,由于具有节能、适应范围广、维护简单等特点,在油田生产中得到越来越多的应用。新疆油田2006年引进可洗井螺杆泵进行试用,但在生产中螺杆泵井陆续出现泵效低、高动液面的现象,产液量达不... 油井地面驱动螺杆泵采油工艺起源于20世纪80年代,由于具有节能、适应范围广、维护简单等特点,在油田生产中得到越来越多的应用。新疆油田2006年引进可洗井螺杆泵进行试用,但在生产中螺杆泵井陆续出现泵效低、高动液面的现象,产液量达不到设计产能。通过大量的现场试验与分析,总结出一种经济可行、科学合理的解决方法,并在实际生产过程中得到了成功应用,将改进后螺杆泵应用于出现以上问题的9口井,平均泵效提高至67.4%,未出现高动液面、低沉没度现象,既节约了螺杆泵的检泵成本,又提高了螺杆泵的使用效率。 展开更多
关键词 螺杆泵 泵效低 高动液面 低沉没度 现场试验 理论分析 解决方案
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Effect of protein molecular weight on the mass transfer in protein mixing
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作者 Ahmed Asad Chuan Chai JiangTao Wu 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2012年第3期470-476,共7页
The mixing of protein solutions with that of precipitating agents is very important in protein crystallization experiments. In this work, the interferometry images were recorded during the mixing of two proteins with ... The mixing of protein solutions with that of precipitating agents is very important in protein crystallization experiments. In this work, the interferometry images were recorded during the mixing of two proteins with different molecular weights: lysozyme of -14.6 kDa, trypsin of -23.3 kDa and pepsin of -34.8 kDa were placed in a Mach-Zehnder interferometer. The protein mo- lecular weight dependence on the competition of the transport process and kinetics at the interface was studied. The concentra- tion profiles of protein solutions were calculated to analyze the mass transfer during the mixing process. It was observed that the mass transfer process is more efficient during the mixing of proteins with higher molecular weights. In addition, the more rapid concentration changes above the interface suggest that convection may dominate the diffusion. The phenomenon of con- vection is higher in the protein solutions with higher molecular weight. 展开更多
关键词 mass transfer protein mixing INTERFACE DIFFUSION Mach-Zehnder interferometer
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