耦合温度影响的动态非线性渗流模型
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刘秀伟(1996—),男,江苏连云港人,在读博士研究生,从事复杂裂缝性储层传质传热数值模拟研究。E-mail:lxw19960606@163.com。

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国家自然科学基金项目“致密油藏注水诱导动态裂缝扩展机理研究”(52104049),国家科技重大专项“致密油藏注水诱发微裂缝机理及反演方法”(ZX20180177)。


A dynamic non-linear flow model coupling temperature influence
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    摘要:

    针对现有非线性渗流模型未考虑温度变化对非线性渗流规律的影响,首先从毛细管渗流模型、Hagen-Poiseuille 公式以及边界层理论出发,结合温度对边界层厚度及流体屈服应力的影响,推导得到低渗透多孔介质中耦合温度影响的动态非线性渗流模型。其次,利用已发表文献中的实验数据开展拟合验证,得到的渗流速度曲线及最小启动压力梯度与实验数据吻合度高,验证了动态非线性渗流模型的准确性,同时与静态非线性渗流模型和达西渗流模型的对比分析,进一步揭示了动态非线性渗流模型的合理性。针对渗流速度曲线进行敏感性分析表明,拟合系数AB取值的增大均会导致渗流速度曲线右移,非线性渗流段曲线弯曲程度减弱,最小启动压力梯度增加。温度升高对渗流速度曲线影响程度较大,导致渗流速度曲线大幅上移,非线性渗流段弯曲程度减弱,最小启动压力梯度同样会增加。该动态非线性渗流模型的提出进一步丰富了非线性渗流理论的发展,可推广至相关两相流及高温高压油气藏数值模拟研究。

    Abstract:

    The existing non-linear flow model does not consider the influence of temperature change on the non-linear flow law.Therefore, based on the capillary flow model, the Hagen-Poiseuille equation, and the boundary layer theory, as well as the influence of the temperature on the thickness of the boundary layer and the yield stress of the fluid, a dynamic non-linear flow model in low-permeability porous media considering the influence of temperature was derived. Then, the fitting verification was carried out according to the experimental data in published literature, and the calculated flow velocity curve and minimum start-up pressure gradient were highly consistent with the experimental data, which revealed the correctness of the dynamic non-linear flow model.Meanwhile, the comparative analysis with the static non-linear flow model and the Darcy flow model illustrated the rationality of the dynamic non-linear flow model. The sensitivity analysis of the flow velocity curve revealed that the increase in coefficients A and B made the flow velocity curve right-shift; the curvature degree of the non-linear flow section was weakened, and the minimum start-up pressure gradient was increased. The increase in the temperature had a much more significant effect on the flow velocity curve, which made the velocity curve move up obviously. The curvature degree of the non-linear flow section weakened, and the minimum start-up pressure gradient increased. The proposal of this dynamic non-linear flow model further enriches the development of the non-linear flow theory and can be extended to the numerical simulation of two-phase flow and high-temperature and highpressure oil and gas reservoirs.

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刘秀伟,王星,程时清,张凤博,汪洋.耦合温度影响的动态非线性渗流模型[J].油气地质与采收率,2024,31(3):178~185

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  • 收稿日期:2023-10-16
  • 最后修改日期:2024-02-16
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  • 在线发布日期: 2024-08-08
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