Impact of reservoir pressure fluctuations on fracture shear slip behavior in shale gas hydraulic fracturing DOI
Zhaohui Lu, Libing Du, Yunzhong Jia

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(12)

Published: Dec. 1, 2024

To elucidate the effect of fluid pressurization rate on shear slip behavior shale fractures during reservoir hydraulic pressure fluctuations, experiments with constant axial stress were conducted at 0.5, 2, 8, and 30 MPa/min rates based fluctuation characteristics hydraulically fractured reservoirs deep gas in Sichuan Basin. The results indicated that quasi-static exhibited higher average velocities than creep by 2–3 orders magnitude equivalent rates. Additionally, rates, type transitioned directly from to dynamic slip. velocity increases increasing rate, are 7.10 × 10−4, 2.20 10−3, 5.40 10−3 mm/s, respectively. Dynamic highest critical 7.14 MPa largest friction coefficient increased 55% a 2 MPa/min. Friction strength primarily 42% 0.5 MPa/min, while minimally decreased 0.03% Notably, significant trend percentage increment. energy released an initially then decreasing pattern over range this experiment, which is result degree inhomogeneity rate. Consequently, led maximum accumulation release fracture surface, resulting minimal displacement, not conducive improved permeability safe recovery.

Language: Английский

Impact of reservoir pressure fluctuations on fracture shear slip behavior in shale gas hydraulic fracturing DOI
Zhaohui Lu, Libing Du, Yunzhong Jia

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(12)

Published: Dec. 1, 2024

To elucidate the effect of fluid pressurization rate on shear slip behavior shale fractures during reservoir hydraulic pressure fluctuations, experiments with constant axial stress were conducted at 0.5, 2, 8, and 30 MPa/min rates based fluctuation characteristics hydraulically fractured reservoirs deep gas in Sichuan Basin. The results indicated that quasi-static exhibited higher average velocities than creep by 2–3 orders magnitude equivalent rates. Additionally, rates, type transitioned directly from to dynamic slip. velocity increases increasing rate, are 7.10 × 10−4, 2.20 10−3, 5.40 10−3 mm/s, respectively. Dynamic highest critical 7.14 MPa largest friction coefficient increased 55% a 2 MPa/min. Friction strength primarily 42% 0.5 MPa/min, while minimally decreased 0.03% Notably, significant trend percentage increment. energy released an initially then decreasing pattern over range this experiment, which is result degree inhomogeneity rate. Consequently, led maximum accumulation release fracture surface, resulting minimal displacement, not conducive improved permeability safe recovery.

Language: Английский

Citations

1