Research on Productivity Characteristics and Correction of Productivity Equations of Gas Wells in Fractured Gas Reservoirs

doi:10.11885/j.issn.1674-5086.2022.07.26.04

Abstract

Abstract: Fractured gas reservoirs are characterized by abundant reserves and high gas well productivity. The binomial productivity equation of conventional theory has bad applicability in fractured gas reservoirs, and the turbulence flow coefficient obtained by theoretical model is far less than the measured results. Taking Keshen Gas Field as an example, we summarize natural gas production characteristics in fractured natural gas reservoirs based on geological cognition, test data, percolation theory and numerical simulation. The analysis results show that intersection of wellbore and natural fractures is the main production well section, and the accumulation of gas in natural fractures increases the turbulence effect during production, resulting in obvious highspeed nonDarcy effect, and the theoretical binomial productivity equation cannot accurately evaluate its productivity. Secondly, the binomial productivity equation correction method for fractured gas reservoirs is established by regressing the relationship between the theory of Keshen Gas Field and the actual nonDarcy flow coefficient. The reliability of the productivity model is verified by the measured data. The case analysis shows that most of the energy consumed in the production process of Keshen gas well is turbulent effect, so it is necessary to control production for reducing pressure loss in fractured gas reservoir. Finally, the calculation value of production is tested with the singlepoint productivity formula. The computed result shows that the gas well productivity calculated under the condition of low production pressure difference is much higher than the actual results, and the reasonable test production pressure difference should be between 4% and 10% of the formation pressure.

Key words: fractured gas reservoir, gas well productivity, correction method, turbulence effect, percolation theory

CLC Number:

TE371

LI Xiaoping, LI Yumin, SHAO Jianbo, DUAN Huating, ZHU Songbai. Research on Productivity Characteristics and Correction of Productivity Equations of Gas Wells in Fractured Gas Reservoirs[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(5): 97-105.

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