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AGER, 2017, 1(3): 148-157 注水过程中油藏孔喉结构演化机理

已有 469 次阅读 2018-1-14 17:31 |个人分类:AGER期刊|系统分类:论文交流| 期刊, 地球科学 |文章来源:转载

【主要内容】水驱开发过程中储层的孔隙结构和物理性质将会发生极大的变化。本文以某油田研究对象,通过分析长期水驱过程中储层孔隙度、渗透率等参数的变化阐明了孔隙结构的演化特征,并通过建立相应的孔隙网络模拟方法揭示了储层性质演化的物理机制。

Advances in Geo-Energy Research, 网址:http://www.astp-agr.com/index.php/Index/Index/detail?id=30


Mechanisms of reservoir pore/throat characteristics evolution during long-term waterflooding

Shoulei Wang, Xiaodong Han, Yeliang Dong, Hongfu Shi


(Published: 2017-12-25)

Corresponding Author and Email: Xiaodong Han, hanxiaodongupc@126.com

Citation: Wang, S., Han, X., Dong, Y., et al. Mechanisms of reservoir pore/throat characteristics evolution during long-term waterflooding. Adv. Geo-energ. Res. 2017, 1(3): 148-157, doi: 10.26804/ager.2017.03.02.

Article Type: Original article

Abstract:
Formation pore structure and reservoir parameters change continually during waterflooding due to sand production, clay erosion, and pressure/temperature variation, which causes great challenge in geological modeling and simulation. In this work, the XA Oilfield, a block with more than 20 years’ waterflooding history, is used as an example to better understand the fundamental evolution mechanisms of reservoir pore network characteristics over long time waterflooding. We performed a large number of core analyses and experiments to obtain formation parameters (e.g., permeability, porosity, relative permeability, and etc.) at different development stages. The comparison illustrates that reservoir permeability can not only decrease with clay plugging, but also increase by the detachment of fine particles and even the destruction of microscopic structure. We also observed that the point/line contacts among grains decreases, the pore network connectivity increases, the clay content reduces and the rock trends to be more hydrophilic with increasing water injection. Moreover, we developed a pore network model to simulate the variation of formation parameter. The model parameters are also compared and analyzed to get a qualitative understanding of the evolvement laws, which will provide a useful guidance for reservoir accurate modeling.


Keywords: Reservoir parameter variation, permeability, water flooding, pore network model, core analysis.

Mechanisms of reservoir pore(throat) characteristics evolution during long-ter.pdf



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