STUDY ON THE INFLUENCE OF INTERWELL INTERFERENCE ON THE PATTERN OF HYDRAULIC CRACK PROPAGATION

摘要

Hydraulic fracturing technology is an important technical means to realize the economic development of low-permeability reservoirs, and the expansion path of hydraulic fractures will be affected by surrounding production wells or injection wells. In order to study the crack propagation process under the influence of surrounding adjacent wells (production wells, injection wells), we use the extended finite element method to establish a twodimensional complete fluid-solid coupling model, and analyze the dynamic propagation patterns of cracks under different production conditions. The experimental results verify the validity of the model. Studies have shown that the hydraulic fracture extension path does not change with the change of the pore pressure around the well when there is only a production well or a water injection well around the fractured well. Moreover, the geometry of the hydraulic fracture does not change with the change of the production well, and the presence of the injection well will make the crack wider and shorter. When the injection well and the production well exist at the same time, the expansion path of the crack will be biased toward the injection well, and the crack will become shorter and wider.