Integrated Completion Optimization for Horizontal Shale Gas Wells in the Sichuan Basin

ABSTRACT: This study focuses on optimizing hydraulic fracturing treatments for shale gas wells in the complex geological and geomechanical setting of the Sichuan Basin. The paper addresses key challenges such as infinite conductivity, stress shadow effects, and optimal cluster spacing, which have not been comprehensively studied in this region. A base case reservoir model was developed to simulate 20 years of production, integrating crucial parameters like matrix permeability and fracture geometry. Three sensitivity analyses were conducted: the first determined the minimum fracture conductivity needed for effective gas drainage; the second explored the stress shadow effect and the required cluster spacing to minimize interference; and the third optimized cluster spacing for different matrix permeability scenarios. Results indicate that a fracture conductivity of 0.1 mD-m is required, with a minimum cluster spacing of 6 meters and an optimal range of 6 to 15 meters for varying permeability. This study provides valuable insights for improving completion design and maximizing typical horizontal well productivity in Sichuan Basin shale gas reservoirs.