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Analysis on Fracture Mechanism and Overflow Gas Production Law of High Pressure Fractured Gas Reservoir

  • INNOVATIVE TECHNOLOGIES OF OIL AND GAS
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Chemistry and Technology of Fuels and Oils Aims and scope

Taking the fractured gas constant volume body as the research unit, considering the boundary conditions such as the height of the constant volume body, the cross-sectional area of the constant volume body, the initial formation pressure, the initial bottom hole pressure and the initial overflow, a mathematical model of the average pressure of the fractured formation of the constant volume body varying with the overflow time is proposed; With the help of programming language, the model is solved. Taking well ST1 as an example, the results show that with the increase of fracture dip angle, the fracture width increases and the fracture permeability also increases; The permeability of fractured gas reservoir is most affected by matrix stress, followed by dip angle and fracture spacing. With the constant volume overflow, the overflow flow decreases rapidly in the initial stage, and then remains stable for a long time until it decreases again in the end; With the increase of throttle back pressure and gas influx, the annular gas holdup increases. The mathematical model of average pressure of fractured formation with constant volume can calculate the change value of average pressure with time, and can guide the design of kill fluid density and the loading of backpressure target value in the process of circulating exhaust.

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Acknowledgments

Project of science and Technology Department of Sinopec, well control risk assessment technology for drilling fractured gas reservoirs in Sichuan and Chongqing area (No. P21069).

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Authors and Affiliations

  1. Sinopec Northwest Oilfield Company, Urumqi, China

    Zongqi Chen

  2. Petroleum Engineering Technology Research Institute of Sinopec Northwest Oilfield Company, Urumqi, China

    Juhe Wang

  3. School of petroleum engineering, Yangtze University, Wuhan, China

    Jiajie Ye & Xiangwei Kong

Authors
  1. Zongqi Chen
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  2. Juhe Wang
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  3. Jiajie Ye
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  4. Xiangwei Kong
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Corresponding author

Correspondence to Xiangwei Kong.

Additional information

Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 2, pp. 69–73 March– April, 2022.

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Chen, Z., Wang, J., Ye, J. et al. Analysis on Fracture Mechanism and Overflow Gas Production Law of High Pressure Fractured Gas Reservoir. Chem Technol Fuels Oils 58, 365–369 (2022). https://doi.org/10.1007/s10553-022-01393-5

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  • DOI: https://doi.org/10.1007/s10553-022-01393-5

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