Journal of Southwest Petroleum University(Science & Technology Edition) ›› 2024, Vol. 46 ›› Issue (2): 87-94.DOI: 10.11885/j.issn.1674-5086.2022.06.10.01

• OIL AND GAS ENGINEERING • Previous Articles     Next Articles

Investigation of Dominant Factors Influencing High-speed Non-Darcy Effect in Gas Wells

WANG Yang1, WANG Bin1, LUO Jianxin2, ZHAO Chuankai1, SHI Lei1   

  1. 1. Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China;
    2. Petroleum Engineering School, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2022-06-10 Published:2024-05-11

Abstract: Practice in gas reservoir development has shown that the high-speed non-Darcy effect has a significant impact on gas well productivity. However, the degree to which high-speed non-Darcy effects impact different gas reservoirs varies. For gas reservoirs with lower pressures, the high-speed non-Darcy effect becomes more pronounced with increasing gas well production rate. For gas reservoirs with higher pressures, the same level of gas well production rate may not cause strong high-speed non-Darcy effects due to the strong gas compression, higher density, viscosity, and lower natural gas seepage speed under higher formation pressure. Sensitivity analysis of the primary factors influencing non-Darcy effects is conducted based on the gas well productivity equation and Reynolds number equation, including reservoir properties and gas properties. The Darcy/non-Darcy flow boundary is established based on the critical Reynolds number, and a Darcy flow chart is created for natural gas. The chart can be used to determine the strength of non-Darcy effects and provide guidance for setting production constraints for gas wells.

Key words: high-speed non-Darcy effect, Reynolds number, gas well productivity, non-Darcy flow chart, proration production

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