Stability analysis of the moving interface in piston- and non-piston-like displacements

From the macroscopic point of view, expressions involving reservoir and operational parameters are established for investigating the stability of moving interface in piston- and non-piston-like displacements. In the case of axisymmetrical piston-like displacement, the stability is related to the moving interface position and water to oil mobility ratio. The capillary effect on the stability of moving interface depends on whether or not the moving interface is already stable and correlates with the wettability of the reservoir rock. In the case of non-piston-like displacement, the stability of the front is governed by both the relative permeability and the mobility ratio.

活塞式小体积管在质量流量计检定中的应用

活塞式小体积管因为体积小,结构复杂,检测的体积需要非常准确的转换成质量流量,制约了活塞式小体积管在检定质量流量计方面的发展。阐述了在活塞式小体积管检定系统中采用脉冲插入、在线密度计实时和准确的测量被检介质的密度等技术,建立活塞式小体积管检定质量流量计的新方法,用以解决高精度质量流量计的检定问题。