多相泡状流中涡轮响应的解释

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常规生产测井涡轮广泛用于生产井的单相和多相流测井 ,并且众所周知 ,多相流中的涡轮响应解释是极其复杂和困难的。通过文献检索没有找到几个能用于解释多相流中涡轮响应的模型。以前文献的一般结论是该响应与总体积流量大体成线性关系 ,但有把握的解释仍非常困难。本文介绍了一种以涡轮转子在泡状流中的角动量平衡为基础的机械模型。该模型包括两部分。第一部分 ,假设①流过涡轮叶片的流体混合得很好 ;②各相之间有滑动 ;③非紊流。因此 ,推出了理想泡状流条件下的理想涡轮响应。结果表明 ,多相泡状流中的涡轮响应并不是流过涡轮的总流体体积的线性一元函数 ,而是滑脱速度、体积百分数、连续相速度及流体特性的多元函数。该分析的第二部分引入了泡的移动长度这一概念 ,以便考虑涡轮外壳或扶正器对泡的流动轨迹的影响 Conventional production logging turbines are widely used for single and multiphase flow logging in production wells and it is well known that turbo response interpretation in multiphase flow is extremely complex and difficult. There are several models that can be used to explain the turbine response in multiphase flow through the literature search. The general conclusion of the previous literature is that the response is generally linear with the total volume flow, but a sound explanation is still very difficult. This paper presents a mechanical model based on the angular momentum balance of turbine rotors in bubble flow. The model consists of two parts. In the first part, it is assumed that (1) the fluid flowing through the turbine blades is well mixed; (2) there is slippage between the phases; (3) non-turbulent flow. Therefore, the ideal turbo response with ideal bubble flow is introduced. The results show that the turbo response in a multiphase bubble flow is not a linear one-factor function of the total fluid flow through the turbine but a multivariate function of slippage velocity, volume fraction, continuous phase velocity, and fluid properties. The second part of the analysis introduced the concept of bubble travel length to account for the effect of the turbine housing or centralizer on the flow path of the bubble
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