Transport mechanism of coal particles in multiphase flow during early coalbed methane production DOI
Biao Yin, Xiaopeng Zhai, Yishan Lou

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(5)

Published: May 1, 2025

During coalbed methane dewatering and production, variations in the dip angle of coal seam create uneven V-shaped grooves horizontal wellbores. To investigate critical velocity transportation particles under different pipeline structures operating conditions, this study combines experiments to analyze pressure fluctuations flow pattern changes a gas–liquid–solid three-phase system during early stage. The intrinsic transport mechanism discharge are identified. Additionally, simulations used calculate particle deposition thickness efficiency various providing direct guidance for field operations. Results show that as gas mass rate increases, periodic differential pipe transitions from slug intermittent flow. Changes inclination increase accelerate transitions, with shift plug at 35°. A reduced fluid increased concentration significantly thickness, particularly pipes 45°. Moreover, ratio 0.4 is only 86%, increasing power function while decreasing exponentially certain conditions. Consequently, matching appropriate design discharged can effectively mitigate well blockage.

Language: Английский

Transport mechanism of coal particles in multiphase flow during early coalbed methane production DOI
Biao Yin, Xiaopeng Zhai, Yishan Lou

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(5)

Published: May 1, 2025

During coalbed methane dewatering and production, variations in the dip angle of coal seam create uneven V-shaped grooves horizontal wellbores. To investigate critical velocity transportation particles under different pipeline structures operating conditions, this study combines experiments to analyze pressure fluctuations flow pattern changes a gas–liquid–solid three-phase system during early stage. The intrinsic transport mechanism discharge are identified. Additionally, simulations used calculate particle deposition thickness efficiency various providing direct guidance for field operations. Results show that as gas mass rate increases, periodic differential pipe transitions from slug intermittent flow. Changes inclination increase accelerate transitions, with shift plug at 35°. A reduced fluid increased concentration significantly thickness, particularly pipes 45°. Moreover, ratio 0.4 is only 86%, increasing power function while decreasing exponentially certain conditions. Consequently, matching appropriate design discharged can effectively mitigate well blockage.

Language: Английский

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