一种用于井筒及近井区流线模拟的半解析方法
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西南石油大学石油与天然气工程学院

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TE257

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A Semi-Analytical Approach for Near-Wellbore Streamline Simulation
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Southwest Petroleum University ,School of Petroleum and Natural Gas Engineering

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    摘要:

    随着对低渗油、致密油和致密气等非常规油气藏的勘探与开发,井筒及近井区的渗流特征研究成为重点。相较于传统的数值模拟方法,流线模拟方法将三维问题解耦为沿流线的一维问题,具有计算速度快和模拟结果可视化程度高等优点。但是,到目前为止流线模拟技术大多应用在全油藏中,对于井筒及近井区的流线模拟研究较少。该研究提出了一种在井筒及近井区进行流线模拟的半解析方法,采用具有对数径向间距的极坐标系统,在较近的区域采取较小的径向步长,能够更准确地捕获到近井区的流动特性。研究了井筒及近井区渗透率的非均质性和不同完井方式对流线几何形状的影响。研究结果表明,行业标准的流线模拟方法Pollock方法不能精确模拟射孔井中的流线路径,半解析流线模拟方法是目前已知的唯一可以在井筒及近井区进行流线模拟的方法,并且在压力分布等方面优于Pollock方法。

    Abstract:

    With the exploration and development of unconventional oil and gas reservoirs such as low permeability oil, tight oil and tight gas, the study of percolation characteristics in near-wellbore area becomes the focus. Compared with the traditional numerical simulation method, the streamline simulation method decouples the three-dimensional problem into a one-dimensional problem along the streamline, which has the advantages of fast calculation speed and high visualization degree of simulation results. However, most of the streamline simulation techniques have been used in the full filed so far, and there are few studies on the streamline simulation of the near-wellbore. The purpose of this study is to streamline modeling in the near-wellbore area, using a polar coordinate system with logarithmic radial spacing, and taking smaller radial steps in closer regions to more accurately capture the flow characteristics in the near-wellbore area. By studying the heterogeneity of permeability in the near-wellbore and the influence of different completion methods on the streamline geometry, the impact on the productivity of the well is studied. The results show that the Pollock method cannot accurately simulate the streamline path in a perforated well. The semi-analytical streamline simulation method is the only known method for streamline simulation in the near-wellbore, and it is better than Pollock method in pressure distribution.

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周铜,段永刚,魏明强,等. 一种用于井筒及近井区流线模拟的半解析方法[J]. 科学技术与工程, , ():

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历史
  • 收稿日期:2019-09-16
  • 最后修改日期:2020-06-14
  • 录用日期:2019-12-19
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