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LI Wei, SHI Qingsan, DONG Haihai, HOU Rui. 2022. Optimum selection of injection-production method for carbon dioxide miscible flooding in low permeability reservoirs: Taking the low-permeability reservoirs of the Kexia Formation in the X zone of the Karamay Oilfield as an example[J]. Geology in China, 49(2): 485-495. doi: 10.12029/gc20220210
Citation: LI Wei, SHI Qingsan, DONG Haihai, HOU Rui. 2022. Optimum selection of injection-production method for carbon dioxide miscible flooding in low permeability reservoirs: Taking the low-permeability reservoirs of the Kexia Formation in the X zone of the Karamay Oilfield as an example[J]. Geology in China, 49(2): 485-495. doi: 10.12029/gc20220210
shu

Optimum selection of injection-production method for carbon dioxide miscible flooding in low permeability reservoirs: Taking the low-permeability reservoirs of the Kexia Formation in the X zone of the Karamay Oilfield as an example

  • 1.

    College of Geology and mining engineering, Xinjiang University, Urumqi 830047, Xinjiang, China

  • 2.

    Xinjiang Oil Field Co exploration and Development Research Institute, Karamay 834000, Xinjiang, China

  • 3.

    Xinjiang Zheng Tian Huaneng Environmental Engineering Technology Co., Ltd., Urumqi 830047, Xinjiang, China

    • Fund Project: Supported by National Natural Science Foundation of China (No.2016ZX05016-004)
More Information
  • Author Bio: LI Wei, male, born in 1995, master candidate, majors in the study of carbon capture and utilization; E-mail: 542464084@qq.com
  • Corresponding author: SHI Qingsan, born in 1975, male, doctor, associate professor, mainly engaged in ecological restoration, carbon capture and utilization research; E-mail: chn473@sina.com 
Received Date:  25 December 2019
Revised Date:  07 January 2020
Publish Date:  25 April 2022
    Abstract

  • This paper is the result of oil and gas exploration engineering.

     Objective

    The low-permeability reservoirs of the Kexia Formation in the X zone of the Karamay Oilfield have problems such as poor physical properties and low waterflooding development and recovery, which affect the sustainable development of the oilfield. CO2 is the main component of global warming, every country in the world is trying to reduce its content in the atmosphere. This research attempts to use CO2 to drive oil and gas to increase the oil production rate in this reservoir and turn bane into a boon.

     Methods

    According to the core samples of the Lower Karamay formation from more than 60 coring wells in the test area, combined with the data of SEM and mercury injection test, the reservoir characteristics are systematically studied, and the pore structure characteristics of low-permeability sandstone reservoir are clearly studied. Using reservoir numerical simulation technology, the injection and production parameters of CO2 water-gas alternating flooding (CO2-WAG) and CO2 continuous gas flooding were optimized, and on this basis, the two development modes were compared.

     Results

    The optimum technical scheme is obtained: using CO2 water-gas alternating flooding technology, 15 wells are injected with water-gas alternately after 4 years of continuous gas injection. The gas-water ratio is 2:1, the gas-water ratio is 1:1 after 10 years. The numerical simulation predicts that the final recovery rate is increased by more than 30% after 15 years of gas injection development.

     Conclusions

    Experiments show that the oil production after gas injection is 1.85 times that of water injection. The output is increased. It is of great significance to achieve stable production in the old oilfieldsand sustainable development of the oilfield.
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