Guide Research on Light Hydrocarbons Separation while Drilling

在油气勘探钻井过程中，发现油气层、确定油气层的具体位置和产能至关重要，而录井是发现油气层、确定油气层的具体位置和产能的重要手段。在众多的录井油气检测技术中，钻井液气体检测技术是最重要的、最常用和最有效的技术，钻井液气体检测技术主要是对钻井液循环携带到地面的地下烃类气体和非烃类气体进行分析，帮助及时发现地下油气，现场指导钻井工作。 目前录井油气检测技术主要面临油气检测的及时性问题、连续性问题和定量化问题，使得油气检测分析的质量不高，有时甚至严重失真，不能真实反映地下地层的含油气情况。随着MWD、LWD、SWD等技术的迅速发展，井底随钻分离检测技术是目前国外录井行业的一个主要发展趋势。井底随钻气...During the process of the oil-gas exploration drilling, it is very important to discover the oil-gas reservoir and to determinate the location and the capacity of the reservoir, and the mud logging is an important technology that can achieve the main purpose of the oil-gas exploration drilling. Among many oil-gas detection techniques, the gas detection technology in the drilling mud is the most im...学位：工学硕士院系专业：化学化工学院化学工程与生物工程系_化学工程学号：2062008115159

Observation on Marangoni convection induced by desorption in falling soap film

In gas-liquid mass transfer processes,Marangoni convection may occur due to the surface tension gradient produced by mass transfer near the interface.With a falling soap film tunnel and the Schlieren optical method,the Marangoni convection patterns along the film surface were observed directly in the desorption process of acetone from the falling soap film.The Schlieren images showed the regular roll convection in the thin falling soap film during the acetone desorption.The hydraulic characteristics were determined experimentally by measuring the variation of acetone concentration in the film and the surface tension of the soap liquid.The results show that the acetone concentration gradient vertical to the falling direction is very small because the thickness of the soap film is in the order of 10-6 m.The variation of acetone concentration along the falling film is large,so there is a significant surface tension gradient,resulting in the Marangoni roll convection.The experimental results and a qualitative analysis may be helpful to understand the mechanism of Marangoni convection near the interface in the mass transfer.国家自然科学基金项目(20606027)---

Shadowg raph observat ion on interfacial turbulence phenomena in gas-liquid mass transfer

联系人及第一作者: 沙勇( 1971- ) , 男, 博士, 副教授。[中文文摘]引言在相际质量传递过程中,界面处液体物化性质由于物质传递发生改变,如产生密度梯度和界面张力梯度,使界面流体发生流动的现象即为界面湍动。通常由界面处流体密度梯度引发的界面湍动称为Rayleigh-Bénard对流,而由界面表面张力梯度引发的界面湍动,称为Marangoni对流[1]。由于传质过程中发生的界面湍动在临近界面处发生,其浓度场和速度场难以测量,目前多利用纹影法、投影法、干涉法等光学测试手段,对其湍动形态进行观察,为了解界面湍动提供直接视觉证据。利用蒸发、吸收、解吸、萃取等传质手段,不同的研究者对界面湍动进行了直接光学观察,考察了不同传质条件下的界面湍动结构,获取的形态众多,结构复杂[2-7]。对于气-液界面传质导致的界面湍动,其光学观察多集中在研究界面平面内出现的细胞形、六边形、滚筒形等规则或不规则形态,通常为湍动充分发展后的形态,尺度偏大[6-9],而对于实际应用中更重要的界面湍动向主体相渗透的时空观察,十分匮乏,尚需大量设计精巧的实验以揭示其内在的规律。传质过程中产生的界面湍动为强非线性传质流动耦合现象,是非线性理论良好的研究对象[10],并且界面湍动促进了流体表面更新,可对宏观传质设备传质产生显著影响[11],对其的深入研究有着理论和实际上的需要。 本文利用放大界面区域的投影法, 观察有机溶剂水溶液挥发过程中,由界面向液相主体渗透的界面湍动结构, 获取直接视觉资料。 [英文文摘]In gas-liquid mass transfer processes,interfacial turbulence may occur due to the surface tension gradient and the density gradient produced by mass transfer near the interface.The interfacial turbulence can enhance the mass transfer since it intensifies the movement of interfacial fluid.By means of the shadowgraph optical method,the interfacial turbulence patterns vertical to the interface were observed directly in the volatilization process of binary systems.The images of the amplified interfacial turbule showed the variation of concent ration and the fluid movement under the interface. Two patterns of interfacial turbulence were observed in the experiments: plume and vortex.With the plume, the interfacial fluid moved slowly and penet rated the liquid deeply.With the vortex, the inter facial turbulence occur red in the vicinity of the liquid interface and the fluid moves quite fast. A qualitative analysis was carried out based on the mechanism of Rayleigh-Bénard convection induced by density gradient and Marangoni convection induced by surface tension gradient.国家自然科学基金项目( 20606027)

Observation and analysis of Marangoni convection induced by desorption in soap film

利用竖直流动皂膜装置,使用纹影光学方法观察了由于丙酮从皂液中解吸,在微米级厚度皂膜上出现的滚筒状MArAngOnI对流结构;通过建立皂膜传质数学模型及求解,分析了丙酮从皂膜解吸过程中浓度及表面张力的变化。结果表明:由于微米级的皂膜厚度,在皂膜平面法向方向皂膜内皂液丙酮浓度变化很小,但浓度梯度较大,对应的表面张力梯度较大,此较大表面张力梯度是丙酮从皂膜解吸过程中出现MArAngOnI对流的主要成因。By means of the falling soap film tunnel and the Schlieren optical method,the orderly roll Marangoni convection patterns along the surface of the falling soap film with 10-6 m order thickness were observed directly during the acetone desorption from the falling soap liquid.The acetone desorption model from the falling soap film was established and solved theoretically in order to analyze the variation of the concentration and the surface tension.The results show that the variation of the acetone concentration vertical to the falling direction within the thin film is very small,but the gradients of both the acetone concentration and surface tension are large.So the big tension gradient is the main reason for the occurrence of the Marangoni roll convection in acetone desorption from soap film.国家自然科学基金资助项目(20606027