Method for evaluating and preventing creep damage to conductivity of hydraulic fracture in gas reservoirs
The present invention discloses a method for evaluating and preventing creep damage to conductivity of hydraulic fracture in gas reservoirs, comprising: (1) selecting a rock sample of target reservoir for creep experiment, and plotting ε-t curve of the rock sample during creep; (2) fitting the fractional Kelvin model with the ε-t curve of the rock sample during creep; (3) calculating the conductivity and permeability of hydraulic fracture considering creep damage; (4) numerically solving the productivity model, calculating the cumulative gas production of the gas well produced up to time t, and calculating the creep damage rate for cumulative production of the gas well; (5) repeating Steps (3) to (4), calculating the creep damage rate for cumulative production for the cases of hydraulic fracture sanding concentration N of 5 kg/m2, 7.5 kg/m2, 10 kg/m2, 12.5 kg/m2 and 15 kg/m2 respectively, plotting the creep damage chart of cumulative production.
SOUTHWEST PETROLEUM UNIVERSITY
G E G G E E G E
G01N E21B G01N G01N E21B E21B G01N E21B
inventional additional additional additional inventional inventional additional inventional
Xiyu Ang Yu Hu Qing Yongming
Chen Luo Peng Jia Yin Li