Practice and understanding of water huff-n-puff in shale oil of Subei Basin

XU Guochen; DU Juan; ZHU Mingchen

doi:10.13809/j.cnki.cn32-1825/te.2024.02.011

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Practice and understanding of water huff-n-puff in shale oil of Subei Basin

更新时间：2025-12-05

- Practice and understanding of water huff-n-puff in shale oil of Subei Basin
- Petroleum Reservoir Evaluation and Development Vol. 14, Issue 2, Pages: 256-266(2024)
- 作者机构：
  
  1. 中国石化华东油气分公司泰州采油厂，江苏泰州 225300中国石化石油工程技术研究院有限公司,北京,102206
  2. 中国石化石油工程技术研究院有限公司,北京,102206
- 作者简介：
- 基金信息：
- DOI：10.13809/j.cnki.cn32-1825/te.2024.02.011
  CLC： TE357
- Published：2024
- 稿件说明：
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XU Guochen, DU Juan, ZHU Mingchen. Practice and understanding of water huff-n-puff in shale oil of Subei Basin[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(2): 256-266.
DOI：

XU Guochen, DU Juan, ZHU Mingchen. Practice and understanding of water huff-n-puff in shale oil of Subei Basin[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(2): 256-266. DOI： 10.13809/j.cnki.cn32-1825/te.2024.02.011.

摘要

苏北盆地金湖凹陷BG区块页岩油压裂后产量递减快、开发效果差，衰竭开发后期如何有效提高单井评估的最终可采储量是能够效益开发的关键。国内外通常采用CO

吞吐的方法进行后期增产，但由于成本较高，效果差异较大，并未广泛使用。在结合BG区块地质特征的基础上，通过岩心核磁、扫描电镜、试井分析等方法开展页岩油注水吞吐增产机理研究，明确了注水吞吐具有大幅提高渗吸动用孔隙（1~100 nm）中页岩油、改善页岩油储层孔渗条件的作用，结合苏北盆地页岩油较好的亲水性、含油性、储层裂缝较为发育三大特点，提出页岩油注水吞吐技术手段，并开展矿场试验。截至目前，2口试验井累计增油量超过7 600 t，具有较好的应用前景和经济效益，对苏北盆地页岩油衰竭开采后期低成本效益增产具有指导意义。

Abstract

The production of BG shale oil Block of Jinhu Sag of Subei Basin declines rapidly after fracturing

showing poor development efficiency. Enhancing the estimated ultimate reserves（EUR） of individual wells during later depletion stages is crucial for profitable development. While CO

huff-n-puff is a common stimulation technique

its high costs and variable effectiveness have limited its widespread adoption. Based on the geological characteristics of BG block

we carried out research on the mechanism of shale oil stimulation by water huff-n-puff by using core NMR

SEM

well test analysis and other methods

and clarified that water huff-n-puff can greatly develop the oil in 1~100 nm pores in imbibition process and improve the porosity and p

ermeability conditions. Given the Subei Basin shale oil's notable hydrophilicity

rich oil content

and extensive fracture network

water huff-n-puff technology was proposed and field-tested. Up to now

the cumulative oil increase of the two test wells is more than 7 600 tons

which shows good application prospects and economic benefits. And it has guiding significance for the low-cost and efficient production stimulation in the shale oil development in Subei Basin.

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