Unstable Propagation and Connection of Multicluster Hydraulic Fractures Induced by Multiwell Hydrofracturing from the Perspective of Shear Stress Shadow Disturbance

In multiwell hydrofracturing, long fractures connect with other perforation clusters, resulting in fracture hits between wells, affecting the propagation of other fractures and the complexity of the fracture network, which in turn adversely affects the production of oil and gas reservoirs. The relative positions and spacings of multiple wells are important factors affecting their connection. To study the multiwell hydraulic fracture propagation under the distribution of cross-perforation clusters, the case of parallel distribution of multiwell perforation clusters was set for comparison, and the well-correlated and connected long hydraulic fractures were analyzed. The results show that the multiwell cross-perforation cluster distribution can effectively avoid the connection between long hydraulic fracture and the fracture of adjacent wells, such that a single fracture can propagate efficiently, and a complex fracture network can be formed. Under the multiwell cross-perforation cluster distribution, the stress disturbance caused by the fractures of the first well reduced, and the degree of fracture deflection also reduced. The wells connection, long hydraulic fracture propagation morphology, and quantitative analysis results of fracture length and volume under different initiation sequences and well spacings in multiwell hydraulic fracturing cross-perforation clusters provide important reference values for multiwell hydrofracturing stimulation in deep tight reservoirs.