管道旋流中油芯的形成条件与形态研究

以石油工业为背景的油水流动是典型的液液两相流。对于管道中的两相流动研究主要是充分发展之后的流型、压降等等。本工作则通过实验研究了一种非稳态阶段的两相流动一经过导流片之后一段距离之内的两相旋涡流动。实验划分了不同相含率与总表观流速下的四种流动形态以及压降规律

油气开发中的多相流问题

本研究系统阐述了油气开发中经常遇到的多相流动问题,如确定油藏量和油藏的分布与变化规律的多相渗流问题,油井中产液的变质量多相流问题,油井和立管的竖直与倾斜管多相流问题,油气水在管线中的水力与热力规律问题,输送管道系统提升泵和增压泵的性能、分离器的效率,混相流量的计量等问题。文中还简略地介绍了中国科学院力学研究所在油气水多相流模拟实验、倾斜井多相流态、稠油减阻、油气水高效分离等方面的研究工作

撬装油气分离设备在胜利海六站的试验

撬装油气水分离设备不仅可用于海上平台油井(组)条件下油气水的分离,而且调整处理流程后还可以对污水进一步处理,处理后的水可作为回注水源。通过对高含水产出液的就地分离和回注,可以有效降低集输管线压力,降低边远区块船舶拉油成本。为了开发一井多用工艺技术,低成本和解决边远区块注水水源缺乏的问题,研制了撬装油气水三相分离设备,并在胜利油田完成了室内试验和现场试验,达到了预期的目标

Multi-pipe string electromagnetic detection tool and its applications

The MID-K, a new kind of multi-pipe string detection tool is introduced. This tool provides a means of evaluating the condition of in-place pipe string, such as tubing and casino. It is capable of discriminating the defects of the inside and outside, and estimating the thickness of tubing and casing. It is accomplished by means of a low frequency eddy current to detect flaws on the inner surface and a magnetic flux leakage to inspect the full thickness. The measurement principle, the technology and applications are presented in this paper

Effect of Pipe Diameter on Flow Pattern Transition in Vertical Oil Water Flows

This paper investiges the effect of pipe diameter on flow pattern transition boundary in oil water vertical flows, and proposes a model to determine the maximum inner diameter (D_{infty s}) of a pipe in which the slug flow would not occur When pipe inner diameter D>D_{infty s}, only bubble flow exists, while

New electromagnetic imaging tool introduced for corrosion detection

The new Electromagnetic Imaging Tool (EMIT) is introduced in this study. It is also described that the basic inspection theory, system structure and applications. The EMIT can determine whether metal loss or casing damage has occurred internally or externally. A 3D casing image can be supplied, including horizontal, vertical profile. The experimental results show that the EMIT has a "high-resolution" for MFL method in the casing well because of the steel brush structure. The minimal diameter of the inspection hole is 4 mm, and the thickness determination error of casing wall is 0.4 mm. A number of examples from oilfield are presented

INVESTIGATION IN HYDRODYNAMICS OF A CIRCULAR CYLINDER WITH THE NEW SUPPRESSING SHROUD FOR VORTEX-INDUCED VIBRATION 1)

通过模型实验和数值模拟计算,研究了带有涡激振动抑制罩的圆截面柱体的水动力特性.模型实验主要测试了柱体上附加谐波型和类圆锥型涡激振动抑制罩的单摆结构在不同流速下发生涡激振动的性质;数值模拟则针对谐波型和圆锥型扰动,在雷诺数Re为10~2到10~5范围内,研究其水动力参数,如阻力、升力和涡脱落频率等,随扰动波长和波动强度的变化.模型实验结果表明,在直圆柱开始发生共振的流速下,带抑制罩的柱体的振幅显著降低,而在更高流速下则显著增大.数值模拟结果表明,谐波型和圆锥型扰动具有相似的水动力特性;且在不同Re时,阻力、升力和涡脱落频率具有相似的变化规律;随波动强度的增大,阻力一般逐渐增大,升力则在多数情况下先减小而后增大,而涡脱落频率一般逐渐减小

中国科学院力学研究所 流固耦合系统力学重点实验室;

通过数值计算,模拟了Re数为10~5时具有圆锥型涡激振动抑制罩、圆形截面的柱形结构的绕流流动;研究带有圆锥型抑制罩的柱体所受到的水动力载荷(包括阻力和升力)。所计算的圆锥型抑制罩的几何参数中,无量纲波长为4、6和8,而波动强度(波高与波长之比)为0.0125、0.025、0.05,0.1和0.2。模拟计算结果表明:当引入圆锥型抑制罩后,结构的平均阻力系数随着波动强度增大一般逐渐增大;脉动升力系数则在无量纲波长为4时随波动强度增大逐渐增大,而在无量纲波长为6和8时脉动升力系数则先减小而后增大;涡脱落频率随波动强度增大则是逐渐减小的