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1.
The Effect of Wettability on Three-Phase Relative Permeability   总被引:1,自引:0,他引:1  
We study three-phase flow in water-wet, oil-wet, and fractionally-wet sandpacks. We use CT scanning to measure directly the oil and water relative permeabilites for three-phase gravity drainage. In an analogue experiment, we measure pressure gradients in the gas phase to determine the gas relative permeability. Thus we find all three relative permeabilities as a function of saturation. We find that the gas relative permeability is approximately half as much in a oil-wet medium than in an water-wet medium at the same gas saturation. The water relative permeability in the water-wet medium and the oil relative permeability in the oil-wet medium are similar. In the water-wet medium the oil relative permeability scales as k roS o 4 for S o>S or, where S or is the waterflood residual oil saturation. With octane as the oil phase, k roS o 2 for S o<S or, while with decane as the oil phase, k ro falls sharply for S o<S or. The water relative permeability in the oil-wet medium resembles the oil relative permeability in the water-wet medium for a non-spreading oil such as decane. These observations can be explained in terms of wetting, spreading, and the pore scale configurations of fluid.  相似文献
2.
We investigate the development foam in granular porous media and the subsequent flow of the surfactant solution, where the fluid fraction variations are visualized and quantified using X-ray computed tomography. It is found that foam flows in a front like manner leading to a residual liquid fraction of 0.18±0.01, far from the inlet surface of the porous sample. A desaturation backward wave is also observed during foam development. We provided direct evidence that the flow of surfactant solution in porous media containing foam gives rise to superposition of a drainage wave and a characteristic viscous fingering pattern. In the wave the liquid fraction ranges from the above residual value to nearly 0.25±0.01. The liquid fraction associated with the viscous fingering decays as a function of distance but the inlet value increases up to 0.06±0.01. Certain ideas about the physics of foam flow in porous media are revised in the light of our findings.  相似文献
3.
利用计算机断层扫描技术(CT)对冻土在三轴剪切过程中的结构变化进行了动态测试.通过对CT图像及CT数的分析发现,冻结粉质粘土在三轴剪切过程中和蠕变过程一样存在结构的弱化和强化现象,孔洞几何特征的改变和孔洞的长大与联合、土粒与土粒、土粒与冰粒之间的相互错动以及滑移是冻土粘塑性变形发展的重要原因.冻土的结构损伤主要发生在冻土屈服之后,这部分损伤不能用CT数的变化来定量计算.  相似文献
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