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首页> 外文期刊>The Journal of Canadian Petroleum Technology >A New Method Using Wellhead Measurement to Approximate Unsteady-State Gas-Water Two-Phase Flow in Wellbore to Calculate Inflow Performance
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A New Method Using Wellhead Measurement to Approximate Unsteady-State Gas-Water Two-Phase Flow in Wellbore to Calculate Inflow Performance

机译：用井口测量法估算井筒中非稳态气水两相流来计算入流性能的新方法

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摘要

An accurate analysis of the pressure and water inflow at the bottomhole of a gas well with free water influx is important for determining an optimized artificial lift method. The commonly used two-phase flow correlations based on steady-state flow have been successfully applied to gas wells in homogeneous reservoirs. However, for reservoirs with a high degree of heterogeneity, such as fractures, the existing techniques often fail due to the unsteady-state flow behaviour from reservoir to wellbore. This paper presents a new method that is derived based on the unsteady-state two-phase flow phenomena and the conservation of mass, taking into consideration the slippage effect of the two phases. In this method, the fluid flow is divided into a number of segments at which pressure drop and gas-liquid distribution under unsteady-state flow conditions can be calculated utilizing the measured data at the wellhead. In this case, more representative bottomhole pressures and water inflow rate changes with time can be calculated, permitting the selection of an optimum artificial lift method. The new method has been successfully tested. A field case is presented involving a gas well in the Sichuan Field in China. The results of the new calculation method and the steady-state calculations were compared with field measurements to determine the accuracy of the method.
机译：对有自由水流入的气井井底压力和水流入的准确分析对于确定最佳的人工举升方法很重要。基于稳态流的常用两相流相关性已成功应用于均质油藏中的气井。然而，对于具有高度非均质性的储层，例如裂缝，由于从储层到井筒的非稳态流动行为，现有技术通常会失败。本文提出了一种基于非稳态两相流现象和质量守恒推导的新方法，同时考虑了两相的滑移效应。在这种方法中，将流体流分为多个部分，在这些部分中，可以利用井口处的测量数据来计算非稳态流动条件下的压降和气液分布。在这种情况下，可以计算出更具代表性的井底压力和进水量随时间的变化，从而可以选择最佳的人工举升方法。新方法已成功测试。现场案例涉及中国四川油田的一口气井。将新计算方法和稳态计算的结果与现场测量结果进行比较，以确定该方法的准确性。

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