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Displacement behavior and mechanism of long-term water flooding in sandstone oil reservoirs

长期水驱砂岩油藏的生产动态及变化机理

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Abstract

Sandstone oil reservoirs with huge bottom water and high permeability are generally developed with high flow rate. After long-term water flooding (LTWF), the water flooding characteristics are quite different from that of original reservoir. In this paper, the effects of the PV number, viscosity, and displacement rate during LTWF are studied through experiments. The mechanism is analyzed based on analysis of changes in oil composition, rock mineral composition and wettability. The oil-water relative permeability curves, oil recovery and wettability were obtained with new experiments methods, which avoids the oil metering error by measuring oil and water separately. The research indicates that when the viscosity increases, the water phase permeability decreases, the residual oil saturation increases, and the water content rate increases earlier. A higher water flooding rate results in a higher ultimate recovery. A higher asphaltene content results in a higher viscosity and more oil-wet reservoir conditions. After LTWF, the wettability tends to water-wet, which is more favorable for heavy oil recovery. Moreover, LTWF reduces the clay content, which creates a more water-wet surface and a larger reservoir pore throat environment. This research provides insightful characteristics of offshore sandstone oil reservoirs, which can be used to enhance oil recovery.

摘要

强底水砂岩储层通常采用大排量水驱开发, 长期水驱后储层水驱特征发生巨大变化。本文采用新的实验方法获得了油水相渗、采收率以及润湿性曲线, 并基于试验结果研究了水驱体积倍数、原油黏度及驱替速度对长期水驱的影响。通过对原油组成、岩石矿物组成以及润湿性变化进行分析, 明确了长期水驱过程中流固相互作用机理。研究表明, 随着原油黏度的增加, 水相渗透率降低, 剩余油饱和度增加, 含水率上升提前。较高的水驱速度会导致较高的最终采收率。沥青质含量越高, 黏度越高, 储层越偏油湿。长期水驱后后润湿性趋于水湿, 更有利于稠油开采。此外, 长期水驱降低了粘土含量, 形成了更偏水湿的岩石表面以及更大的储层孔喉环境。本研究为海上砂岩油藏开发及提采提供了一定的理论依据。

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Authors and Affiliations

  1. College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing, 102249, China

    Ren-yi Cao  (曹仁义), Zhi-kai Wang  (王志凯), Jun Jiang  (江俊) & Zhi-hao Jia  (贾志豪)

  2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China

    Ren-yi Cao  (曹仁义)

  3. Shenzhen Branch, China National Offshore Oil Corporation, Shenzhen, 518054, China

    Zong Dai  (戴宗), Ya-hui Wang  (王亚会) & hai-long Li  (李海龙)

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  1. Ren-yi Cao  (曹仁义)
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Correspondence to Ren-yi Cao  (曹仁义).

Additional information

Foundation item

Project(51674273) supported by the National Natural Science Foundation of China; Project(CNOOC-KJ135ZDXM22LTD02SZ2016) supported by the Major Science and Technology Projects of CNOOC, China

Contributors

The overarching research goals were developed by CAO Ren-yi, DAI Zong and WANG Yan-hui. JIANG Jun and WANG Zhi-kai provided the data of long-term waterflooding, and analyzed the measured data. The initial draft of the manuscript was written by WANG Zhi-kai, LI hai-long and JIA Zhi-hao. All authors replied to reviewers’ comments and revised the final version.

Conflict of interest

CAO Ren-yi, DAI Zong, WANG Zhi-kai, WANG Ya-hui, JIANG Jun, LI Hai-long and JIA Zhi-hao declare that they have no conflict of interest.

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Cao, Ry., Dai, Z., Wang, Zk. et al. Displacement behavior and mechanism of long-term water flooding in sandstone oil reservoirs. J. Cent. South Univ. 28, 834–847 (2021). https://doi.org/10.1007/s11771-021-4648-3

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