Numerical Simulation Optimization Research on Fracture Propagation of Multi-Cluster Fracturing in Tight-Oil Horizontal Wells

Multi-cluster fracturing technology of horizontal well has become an important means for effective development of tight oil reservoirs. However, the influence of engineering parameters and perforation parameters on multi-cluster fracture extension is not clear. Based on the multi-cluster fracture propagation model considering the effects of hole abrasion and induced stress field, the influence of different proppant concentration,fiuid displacement and perforation cluster parameters on fracture propagation morphology was studied in tight oil block X in Daqing Oilfield. The results show that: (1) With the increase of proppant concentration, the abrasion degree of pore diameter increases and the propagation uniformity index of multiple fractures decreases.(2)With the increase of fluid displacement, the abrasion degree of pore diameter increases, and the propagation uniformity index of multiple fractures first increases and then slightly decreases. (3) With the decrease of the number of single cluster holes, the uniformity index of multi-cluster fractures increases gradually. The overall low perforation density in multi-cluster fracture stages is conducive to the uniform propagation of multi-cluster fractures. (4) With the decrease of the aperture, the uniformity index of each perforating cluster increases. Appropriately reducing the perforating aperture can effectively balance the negative effect of stress induced by multi-cluster fractures, which is conducive to the uniform propagation of multi-cluster pressure fractures within the segment. This research method and theory can provide certain reference and guidance for the effective development of similar tight oil reservoirs.