地下储气库井管柱沿程流体状态数值模拟

发布时间：2018-04-19 19:36

本文选题：地下储气库 + 定向井　；参考：《石油钻采工艺》2017年04期

【摘要】：确定注采过程中天然气在油管柱内的运动状态是分析储气库井管柱受力、确定冲蚀位置的关键。根据井身结构和运行参数建立天然气流经储气库定向井油管柱过程的物理模型,通过数值试验研究造斜段管柱内沿程速度、涡量和近壁压力分布;分析注采压差、井斜角及油管内径对管柱近壁压力的影响规律。结果表明:油管柱内流体状态受注采压差和井身结构影响,天然气流速和近壁压力在流入流出造斜段时发生波动;管柱沿程速度和动压随井深增大而减小,冲蚀点位置出现在造斜段流入端和流出端管柱中心线与最大狗腿角位置径向线的连线上;随着注采压差增大,流入端和流出端弯曲外侧和内侧平均压程比均明显增大;随着井斜角增大,流入端弯曲外侧和内侧的平均压程比增大,流出端弯曲外侧和内侧的平均压程比减小;随着油管内径增大,流入端弯曲外侧和内侧的平均压程比减小,流出端弯曲外侧和内侧的平均压程比增大。
[Abstract]:Determining the movement state of natural gas in tubing string during injection and production is the key to analyze the stress of gas storage well string and determine the erosion position. According to the well structure and operation parameters, the physical model of natural gas flowing through the tubing string of the directional well in the gas storage reservoir is established. The velocity, vorticity and near-wall pressure distribution along the pipe string in the inclined section are studied by numerical experiments, and the pressure difference between injection and production is analyzed. The influence of well angle and tubing inner diameter on the near wall pressure of pipe string. The results show that the fluid state in the tubing string is affected by the pressure difference between injection and production and the wellbore structure, the flow rate of natural gas and the pressure near the wall fluctuate when flowing into and out of the diagonal section, and the velocity and dynamic pressure along the pipe string decrease with the increase of well depth. The location of the erosion point appears on the line between the central line of the pipe string and the position of the maximum dog leg angle at the inlet and outflow end of the oblique section and the radial line of the position of the maximum dog leg angle, and with the increase of the pressure difference between injection and production, the average ratio of the lateral and medial mean pressure at the inlet and outflow ends increases obviously. With the increase of the inclined angle, the average pressure range ratio of the outside and the inside of the inlet end increases, while the average pressure range ratio of the outside and the inside side of the outflow end decreases, and the average pressure range ratio of the outside and the inside of the inlet end decreases with the increase of the inner diameter of the tubing. The average pressure range ratio of the lateral and medial bends of the outflow increased.
【作者单位】：中国石油大学(华东);中国石油集团石油管工程技术研究院;中国石油华北油田分公司;
【基金】：国家自然科学基金资助课题“基于应变控制的热采井套管试验及安全可靠性研究”(编号:51274231);国家自然科学基金资助课题“基于多目标约束优化方法的页岩气储层微裂缝分析及压裂缝网扩展机理研究”(编号:51374228)
【分类号】：TE822

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