低渗透油藏非线性渗流：模型和实验验证

xinmeng

低渗透油藏非线性渗流：模型和实验验证

Advances in Geo-Energy Research, 2019, 3(1): 76-81

原文网址: http://www.astp-agr.com/index.php/Index/Index/detail?id=100

      低渗透油藏非均质性强、渗透率低、微米效应明显、流动阻力大、固液相互作用显著，致使流体在低渗透油藏的流动偏离达西定律。对于各因素之间的相互作用及对渗流规律的影响说法不一。本文基于水在纳米圆管和岩芯中的流动实验结果，提出一个新的低渗透油藏指数渗流模型。

通过流体在不同管径的微、纳米管中的微观流动实验结果，根据毛管模型和边界层理论，液体在微管中流动时在壁面附近存在边界黏附层，且边界黏附层厚度随着驱动力的增加而减小，最大边界层占比为1。基于此原理，通过理论推导，得到一个新的低渗透油藏指数渗流模型。并利用某油田渗透率为4-8mD的天然岩心在不同压力梯度下进行水驱实验，指数模型能够很好的拟合这些岩心的单相水驱实验结果，验证了本渗流模型的有效性。新模型各参数的物理意义明确，较大的驱动力同样适用，可用于描述低渗透油藏的非线性特征。

Nonlinear flow in low permeability reservoirs: Modelling and experimental verification

Fuquan Song , Liwen Bo, Shiming Zhang Yeheng Sun

(Published: 2018-12-01)

CorrespondingAuthor and Email:  Fuquan Song, songfuquan@zjou.edu.cn; ORCID: https://orcid.org/0000-0002-9630-1953

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Citation: Song, F., Bo, L., Zhang, S., Sun, Y. Nonlinear flow in low permeability reservoirs: Modelling and experimental verification. Advances in Geo-Energy Research, 2019, 3(1): 76-81, doi: 10.26804/ager.2019.01.06.

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ArticleType: Original article

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Abstract：

       The low-permeability reservoirs are of heavy heterogeneity, low permeability, fine oil-water passages, strong resistance during flow, and the significant interaction between solid and liquid interfaces causes the flow of fluid in reservoir deviating from the Darcy’s law. There is no agreement on the interaction between the various factors in seepage process and the influence of seepage law. The boundary layer exists when liquid flow in micro-tubes and nano-tubes, and the boundary layer decreases with the increase of driving force, and the maximum value of boundary layer ratio is equal to 1. Based on the capillary boundal model and the boundary layer theory, a new exponential seepage model for low permeability reservoirs was proposed. Some experiments of water flow with different pressure gradient were carried out in low permeability cores with permeability of 4 to 8 milidarcy in natural rock cores from an oilfield in China, and the nonlinear model is of good agreement with the single-phase water flooding experiments of these cores. The results demonstrate that the physical meaning of each parameter of the new model is clear and it can be applied to describe the nonlinear characteristics of low permeability reservoirs. The large driving force can overcome disadvantages in the developments of low permeability reservoirs.

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Keywords: Low permeability reservoirs, non-Darcy seepage, threshold pressure gradient, boundary adhesion layer, slip length.