低渗岩心自发同向渗吸启动压力梯度计算方法
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TE33

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中石化股份公司重大科技项目计划“百万吨CO2驱油封存示范应用技术研究” (P22080)。


Study on Calculation Method of Threshold Pressure Gradient of Low Permeability Core During the Same Direction Spontaneous Imbibition Process
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    摘要:

    基于Backly-Leverett水驱油理论,考虑自发同向渗吸过程润湿相前缘向前推进突破岩心出口端前、后时的渗流阻力差异,建立了考虑重力、毛管力、粘滞力和启动压力梯度的一维低渗岩心同向渗吸数学模型;利用建立的数学模型,通过调整启动压力梯度表达式中油水相系数和指数,当计算得到的渗吸速度与时间的关系曲线与室内同向渗吸实验实测曲线实现较好拟合时,即可得到渗吸过程中启动压力梯度的大小及变化规律。通过对5组渗吸实验结果拟合表明,该数学模型能够有效进行自发同向渗吸过程启动压力梯度大小的计算,可见该方法的建立对于进一步完善渗吸理论数学模型以及丰富启动压力梯度的计算方法具有重要意义。

    Abstract:

    Based on the theory of Backly-Leverett water flooding, considering gravity, capillary force, viscous force and threshold pressure gradient, and considering the different characteristics of the same direction imbibition resistance between before and after the leading edge of wetting phase breakthrough the outlet, a one-dimensional low permeability imbibition mathematical model in the same direction is established. Using the mathematical model, by adjusting the coefficient and the index of oil-water phase in the threshold pressure gradient equation, when the calculated curve result of the imbibition rate and time is consistent with the experimental curve result of the imbibition in the same direction,The values and the changes characteristic of the threshold pressure gradient in the imbibition process can be obtained. The results of the five groups experiments and calculations show that the mathematical model can effectively calculate the threshold pressure gradient of spontaneous imbibition. It can be seen that the establishment of the mathematical method is of great significance to further improve the theory of imbibition and rich the calculation method of starting pressure gradient.

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尤启东. 低渗岩心自发同向渗吸启动压力梯度计算方法[J]. 科学技术与工程, 2023, 23(14): 5978-5987.
You Qidong. Study on Calculation Method of Threshold Pressure Gradient of Low Permeability Core During the Same Direction Spontaneous Imbibition Process[J]. Science Technology and Engineering,2023,23(14):5978-5987.

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  • 收稿日期:2022-10-12
  • 最后修改日期:2023-03-21
  • 录用日期:2022-12-02
  • 在线发布日期: 2023-06-01
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