IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v16y2023i19p6961-d1254122.html
   My bibliography  Save this article

Research on Transformation of Connate Water to Movable Water in Water-Bearing Tight Gas Reservoirs

Author

Listed:
  • Fuhu Chen

    (Petroleum Engineering Technology Research Institute, SINOPEC North China Oil & Gas Company, Zhengzhou 450000, China)

  • Zengding Wang

    (National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
    Research Center of Multiphase Flow in Porous Media, School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Shuaishi Fu

    (National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
    Research Center of Multiphase Flow in Porous Media, School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Aifen Li

    (National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
    Research Center of Multiphase Flow in Porous Media, School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Junjie Zhong

    (National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
    Research Center of Multiphase Flow in Porous Media, School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

Abstract

The Dongsheng gas field is a water-bearing tight gas reservoir characterized by high connate water saturation. During gas production, the transformation of connate water into movable water introduces a unique water production mode, significantly impacting gas reservoir recovery. Current experimental and theoretical methods for assessing formation water mobility are static and do not address the transformation mechanism from connate into movable water. In this study, we considered dynamic changes in formation stress and proposed the mechanism for the transformation of connate water into movable water during depressurization, involving the expansion of connate water films and the reduction of pore volume. We developed a novel methodology to calculate the dynamic changes in movable and connate water saturation in tight reservoirs due to reservoir pressure reduction. Furthermore, we quantitatively evaluated the transformation of connate water into movable water in the Dongsheng gas field through laboratory experiments (including formation water expansion tests, connate water tests, and porosity stress sensitivity tests) and theoretical calculations. Results show that under original stress, the initial connate water saturation in the Dongsheng gas field ranges from 50.09% to 58.5%. As reservoir pressure decreases, the maximum increase in movable water saturation ranges from 6.1% to 8.4% due to the transformation of connate water into movable water. This explains why formation water is produced in large quantities during gas production. Therefore, considering the transition of connate water to movable water is crucial when evaluating water production risk. These findings offer valuable guidance for selecting optimal well locations and development layers to reduce reservoir water production risks.

Suggested Citation

  • Fuhu Chen & Zengding Wang & Shuaishi Fu & Aifen Li & Junjie Zhong, 2023. "Research on Transformation of Connate Water to Movable Water in Water-Bearing Tight Gas Reservoirs," Energies, MDPI, vol. 16(19), pages 1-13, October.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:19:p:6961-:d:1254122
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/16/19/6961/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/1996-1073/16/19/6961/
    Download Restriction: no
    ---><---

    References listed on IDEAS

    as
    1. Ren Wang & Kai Liu & Wanzhong Shi & Shuo Qin & Wei Zhang & Rong Qi & Litao Xu, 2022. "Reservoir Densification, Pressure Evolution, and Natural Gas Accumulation in the Upper Paleozoic Tight Sandstones in the North Ordos Basin, China," Energies, MDPI, vol. 15(6), pages 1-21, March.
    2. Xinling Hu & Jian Wang & Liang Zhang & Hongli Xiong & Zengding Wang & Huazheng Duan & Jun Yao & Hai Sun & Lei Zhang & Wenhui Song & Junjie Zhong, 2022. "Direct Visualization of Nanoscale Salt Precipitation and Dissolution Dynamics during CO 2 Injection," Energies, MDPI, vol. 15(24), pages 1-14, December.
    3. Mianmo Meng & Yinghao Shen & Hongkui Ge & Xiaosong Xu & Yang Wu, 2020. "The Effect of Fracturing Fluid Saturation on Natural Gas Flow Behavior in Tight Reservoirs," Energies, MDPI, vol. 13(20), pages 1-15, October.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Xianke He & Jun Li & Dongping Duan & Binbin Liu & Xiaoqing Shang & Wenjun Li & Zeyang Xu & Zhiwei Du & Chenhang Xu, 2023. "Driving Forces of Natural Gas Flow and Gas–Water Distribution Patterns in Tight Gas Reservoirs: A Case Study of NX Gas Field in the Offshore Xihu Depression, East China," Energies, MDPI, vol. 16(16), pages 1-22, August.
    2. Hanwen Yu & Jiaren Ye & Qiang Cao & Yiming Liu & Wei Zhang, 2023. "Study on the Tight Gas Accumulation Process and Model in the Transition Zone at the Margin of the Basin: A Case Study on the Permian Lower Shihezi Formation, Duguijiahan Block, Ordos Basin, Northern C," Energies, MDPI, vol. 16(3), pages 1-30, February.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jeners:v:16:y:2023:i:19:p:6961-:d:1254122. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.