排序方式: 共有73条查询结果,搜索用时 15 毫秒
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油气水三相流的计量,可以分解为两个步骤来进行,一是将油气水三相视为气液两相流计量,因为气液两相流的测量技术相对较为成熟;二是进行液相内部的油水两相测量。IMP分布式数据检测系统适用于多路模拟量信号(电压、电阻、温度、应变等)的采集监测和模拟量的输出(电流、电压)以及各种数字信号(状态、频率、事件、周期等)的输入和数字量的输出。因为它具有系统组成简单、抗干扰能力强、现场分散安装和适应恶劣现场环境等特点,所以已在生产和科学实验中得到了广泛的应用。自动数据采集系统软件包性能可靠,界面友好,交互性很强,功能强大,操作方便。 相似文献
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In this companion paper, flow patterns in the upstream and downstream tubes of a sudden-expansion cross-section (SECS) in a vertical straight pipe were presented. The effect of SECS on flow patterns upstream and downstream was analyzed by comparing with flow patterns in uniform cross-section vertical tubes. It is found the effect is great. There exist great instabilities of two-phase flow in the neighboring areas of the SECS both downstream and upstream. 相似文献
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The maximum effective hole-diameter mathematical modei describing the flow of slightly compressible fluid through a commingled reservoir was solved rigorously with consideration of wellbore storage and different skin factors. The exact solutions for wellbore pressure and the production rate obtained from layer j for a well production at a constant rate from a radial drainage area with infinite and constant pressure and no flow outer boundary condition were expressed in terms of ordinary Bessel functions. These solutions were computed numerically by the Crump's numerical inversion method and the behavior of systems was studied as a function of various reservoir parameters. The modei was compared with the real wellbore radii modei. The new modei is numerically stable when the skin factor is positive and negative, but the real wellbore radii modei is numerically stable only when the skin factor is positive. 相似文献
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由于在钻井过程中泥浆的侵入、射孔以及井下作业,实际的油气井总有一定的表皮效应。以往的双层油气藏的有效井径数学模型将表皮效应视为相等,对于双层油气藏来说,各层的表皮效应可能不同。章采用最大有效井径的概念,建立了一个新的具有层间越流的双层封闭油气藏井底压力的动态模型。此模型考虑了表皮效应和井筒储存的影响,且各层的表皮系数不同。通过拉氏变换得到了拉氏空间下以Bessel函数表示的精确解。运用Crump数值反演方法,得到了实空间的解;分析了压力动态特征。该模型不但适合于表皮系数为正的情况,也适合于表皮系数为负的情形。最后指出了Bourdet模型的局限性。用新模型绘制的典型曲线进行拟合,将得到更加准确的结果。 相似文献
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