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Numerical Simulation of Pulsed Gravel Packing Completion in Horizontal Wells

机译：水平井脉冲砾石填料完成的数值模拟

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The gravel packing completion method for horizontal wells has the advantages of maintaining high oil production for a long time, maintaining wellbore stability, and preventing sand production, so it has become the preferred completion method for horizontal wells. At present, this technology still faces the problems of high sand bed height and poor gravel migration. In order to improve the efficiency of gravel packing in horizontal wells, pulsed gravel packing technology for horizontal wells is proposed for the first time. Based on the mechanism of hydraulic pulse, the Eulerian–Eulerian model, k-ε model based on the renormalization group theory (RNG k-ε model), and Fluent are used to simulate the solid-liquid two-phase flow. By optimizing the parameters such as frequency and amplitude of pulse waveform, the optimal pulse waveform of pulsed gravel packing in horizontal wells is determined. The effects of parameters such as sand-carrying fluid displacement, sand-carrying fluid viscosity, sand-carrying ratio, gravel particle size, and string eccentricity on pulsed gravel packing in horizontal wells are studied, and the distribution law of gravel migration velocity and volume fraction in horizontal wells is obtained. According to the results, it can be seen that with the increase of displacement and viscosity of carrier fluid, the volume fraction of fixed bed and moving bed decreases gradually, while that of suspension bed increases gradually. With the increase of sand-carrying ratio, gravel particle size, and string eccentricity, the volume fraction of fixed bed and moving bed increases gradually, while that of suspended bed decreases gradually. Comparing the effects of conventional gravel packing and pulsed gravel packing in horizontal wells, it can be concluded that the efficiency of pulsed gravel packing in horizontal wells is higher. The volume fraction of fixed bed and moving bed decreased by 30% and 40% respectively, while the volume fraction of suspended bed increased by 20%. The migration velocity of moving bed and suspended bed increased by 40% and 25%, respectively, and the migration ability of gravel improved obviously.
机译：水平井的砾石填料完成方法具有长时间保持高油生产，维持井筒稳定性和防止砂生产，因此它已成为水平孔的首选完成方法。目前，这项技术仍然面临着高砂床高度和砾石迁移差的问题。为了提高水平井砾石填料的效率，首次提出了水平孔的脉冲砾石填料技术。基于液压脉冲的机制，基于重新运算组理论的欧拉 - 欧洲模型，K-ε模型（RNG K-ε模型），用于模拟固液两相流。通过优化诸如脉冲波形的频率和幅度的参数，确定水平孔中的脉冲砾石填料的最佳脉冲波形。研究了诸如沙子携带流体位移，砂携带流体粘度，砂比，砾石粒度和柱偏心的参数的影响，以及水平井的脉冲砾石填料上的偏心率，以及砾石迁移速度和体积的分布定律获得水平孔中的级分。根据结果​​，可以看出，随着载体流体的位移和粘度的增加，固定床和移动床的体积分数逐渐降低，而悬浮床的逐渐增加。随着砂携带率的增加，砾石粒径和串偏心，固定床和移动床的体积分数逐渐增加，而悬浮床的逐渐增加。比较常规砾石填料和脉冲砾石填料在水平孔中的效果，可以得出结论，水平井中脉冲砾石填料的效率更高。固定床和移动床的体积分量分别降低30％和40％，而悬浮床的体积分数增加了20％。移动床和悬浮床的迁移速度分别增加了40％和25％，并且显着提高了砾石的迁移能力。

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