As a rule, the production rate of a shale gas well is high at the initial stage and decreases within approximately one year of production. On the one hand, the rate of production of the horizontal shale gas well is obviously affected by the bottom hole liquid accumulation when even a cubic meter volume of accumulated liquid can lead to a complete cessation of gas production. On the other hand, the production rate is also sensitive to gas transmission pressure and the transmission mode. Due to the great difference in the gas production and percolation mechanism between a shale gas reservoir and a conventional gas reservoir; the error of prediction of the gas flow pattern can be very high. Based on the modern shale gas dynamics, the method of multiple regression analysis is proposed to predict the average pressure drop gradient of a gas well, and the average error rate is 9.0%. The new method has the advantages of high efficiency and low cost. According to the actual production data fitting, the gas wells are divided into stable production and unstable production wells, depending on the average pressure drop gradient, which effectively reflects the implementation of a well drainage gas production technology.
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Acknowledgments
This study was supported by the National Major Oil and Gas Project (No. 2017ZX05037004) and PetroChina Southwest Oil and Gas Field Company project (No. 2019030907). The authors would also like to thank the Changning Company of PetroChina Southwest Oil and Gas Field Company for providing the test data and gas well statistics data.
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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 2, pp. 57 – 60, March – April, 2021.
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Ma, H., Yang, Z., Xie, N. et al. Dynamic Analysis Method Research and Application of Shale Gas Horizontal Well. Chem Technol Fuels Oils 57, 289–298 (2021). https://doi.org/10.1007/s10553-021-01249-4
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DOI: https://doi.org/10.1007/s10553-021-01249-4