Huang Jingting, Chen Liqiong, Li Shuxuan, Guo Jinghang, Li Yuanyuan
State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China.
North China Oil and Gas Company, Sinopec, Zhengzhou 712034, China.
Polymers (Basel). 2022 Dec 8;14(24):5381. doi: 10.3390/polym14245381.
In the study of polymer flooding, researchers usually ignore the genetic stress properties of viscoelastic fluids. In this paper, we investigate the process of viscoelastic fluid flooding the remaining oil in the dead end. This work uses the fractional-order Maxwell in the traditional momentum equation. Furthermore, a semi-analytic solution of the flow control equation for fractional-order viscoelastic fluids is derived, and the oil-repelling process of viscoelastic fluids is simulated by a secondary development of OpenFOAM. The results show that velocity fractional-order derivative α significantly affects polymer solution characteristics, and increasing the elasticity of the fluid can significantly improve the oil repelling efficiency. Compared to the Newtonian fluid flow model, the fractional order derivative a and relaxation time b in the two-parameter instanton equation can accurately characterize the degree of elasticity of the fluid. The smaller the a, the more elastic the fluid is and the higher the oil-repelling efficiency. The larger the b, the less elastic the fluid is and the lower the cancellation efficiency. Moreover, the disturbance of the polymer solution to the dead end is divided into two elastic perturbation areas. The stronger the elasticity of the polymer solution, the higher the peak value of the area in the dead end and the higher the final oil displacement efficiency.
在聚合物驱油研究中，研究人员通常忽略粘弹性流体的遗传应力特性。本文研究了粘弹性流体驱替死端残余油的过程。这项工作在传统动量方程中使用了分数阶麦克斯韦模型。此外，推导了分数阶粘弹性流体流动控制方程的半解析解，并通过OpenFOAM二次开发模拟了粘弹性流体的驱油过程。结果表明，速度分数阶导数α对聚合物溶液特性有显著影响，增加流体弹性可显著提高驱油效率。与牛顿流体流动模型相比，双参数瞬子方程中的分数阶导数a和松弛时间b能准确表征流体的弹性程度。a越小，流体弹性越大，驱油效率越高。b越大，流体弹性越小，驱替效率越低。此外，聚合物溶液对死端的扰动分为两个弹性扰动区域。聚合物溶液弹性越强，死端区域峰值越高，最终驱油效率越高。
