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Study on the Rule of Change of Reservoir Rocks under Subcritical Steam Effect

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  • Haifeng Li

    (University of Chinese Academy of Sciences, Beijing 100048, China
    Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China
    Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
    State Key Laboratory of Enhanced Oil Recovery, PetroChina, Beijing 100083, China)

  • Qiang Wang

    (Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China
    Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
    State Key Laboratory of Enhanced Oil Recovery, PetroChina, Beijing 100083, China)

  • Yongbin Wu

    (Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
    State Key Laboratory of Enhanced Oil Recovery, PetroChina, Beijing 100083, China)

  • Bolin Lv

    (Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
    State Key Laboratory of Enhanced Oil Recovery, PetroChina, Beijing 100083, China)

  • Chao Wang

    (Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
    State Key Laboratory of Enhanced Oil Recovery, PetroChina, Beijing 100083, China)

  • Jipeng Zhang

    (School of Energy Resources, China University of Geosciences, Beijing 100083, China)

Abstract

This paper examines the lithology, pore throat, and fluid characteristics of the reservoir in Liaohe Oilfield Block 3624, using group V rocks as an example, combining a high-temperature and high-pressure reaction still with other equipment such as a rock mechanics tester and a scanning electron microscope. This study also designs and develops three controlled variable experiments, including the subcritical steam reservoir rock dissolution experiment, the subcritical steam reservoir rock mineral composition transformation experiment, and the subcritical steam reservoir rock mineral mechanical property experiment, also making clear the rule of change on the part of the rocks in the deep and heavy oil reservoirs after the injection of subcritical steam. Experimental results reveal the following: (1) Steam causes the dissolution of rocks, and when the steam temperature is in the subcritical region, dissolution is visible. After a 350 °C subcritical steam treatment, the relative melting temperatures of the components of rock materials are substantially greater than the melting point of the cement holding them together, causing the cement to significantly dissolve and a secondary crack network to emerge. (2) The mineral composition of the rocks changes as a result of elevated temperatures, with various mineral transformation trajectories being recorded after various steam treatments. Montmorillonite in reservoir rocks is converted into minerals like illite and chlorite in the subcritical steam temperature range. Another element influencing the creation of secondary cracks on rock surfaces is the reciprocal transformation of minerals, which alters the cohesiveness among mineral components. (3) Rocks suffer thermal damage and changes to their mechanical characteristics as a result of high-temperature steam dissolution and mineral transformations; the severity of these changes increases with the steam temperature.

Suggested Citation

  • Haifeng Li & Qiang Wang & Yongbin Wu & Bolin Lv & Chao Wang & Jipeng Zhang, 2024. "Study on the Rule of Change of Reservoir Rocks under Subcritical Steam Effect," Energies, MDPI, vol. 17(6), pages 1-15, March.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:6:p:1323-:d:1354347
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    References listed on IDEAS

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    1. Zhao, Yangsheng & Feng, Zijun & Zhao, Yu & Wan, Zhijun, 2017. "Experimental investigation on thermal cracking, permeability under HTHP and application for geothermal mining of HDR," Energy, Elsevier, vol. 132(C), pages 305-314.
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