摘要：Tight oil and gas reservoirs,especially shale gas reservoirs with low porosity and low permeability,require hydraulic fracturing technology to build oil and gas seepage channels.As the gas production gradually decreases after fracturing,repeated fracturing becomes particularly important.According to the production performance data and technical index data of shale gas wells,combined with the cluster pore pressure distribution of each segment,the perforation segment cluster liquid sequence and fracture opening sequence are studied.The open state before and after the fracture is simulated through the discrete network model,and the optimization of the fracture parameters of repeated fracturing are performed.The results show that according to the pore pressure distribution,2 of the perforation clusters are easier to enter the liquid the rest 2 clusters are difficult to enter the liquid.2 of the perforation clusters are opened first,and the other clusters are opened in sequence according to the required pump pressure.During the fracturing process,the fracture width should be enlarged to increase the sanding concentration.The preferred repeated fracturing process parameters are: the total fluid volume range is 2200m3—2300m3,the order of sanding proppant is "80/120+40/70+30/50”,the ratio of sanding prop-pant type is 2:2:1.
关键词：Shale gas reservoir;repeated fracturing;fracture opening;numerical simulation;parameter optimization
