Analysis of the Comprehensive Capacity of Fluid Sewing Based on the Pressure Drop Curve of Stopping Pump

China is abundant in tight oil and gas resources, often utilizing hydraulic fracturing technology to modify low-porosity, low-permeability tight reservoirs. The fracture structure formed within the reservoir after fracturing operations is one of the primary factors in judging the effectiveness of fracturing modifications. Therefore, this paper evaluates the complexity of post-fracturing fractures through the pump-shutdown pressure decline curve and concurrently employs linear regression methods to solve for the main controlling factors influencing fracture complexity. Additionally, the grey relational analysis method is utilized to fit the main controlling factors into a comprehensive fluid fracture-creating capacity. Using the pump-shutdown pressure decline curve model, a comprehensive analysis of the post-fracturing fracture complexity of tight oil and gas in the G5 fault block of Jidong was completed. For vertical wells, a total of 41 wells and 49 intervals were analyzed; for horizontal wells, a total of 6 wells and 85 intervals were analyzed, with the fracture complexity of the total 134 intervals classified into simple fractures, moderately complex fractures, and complex fractures. Subsequently, through linear regression analysis, displacement and fluid volume were screened out as the two main controlling factors. Utilizing the grey relational analysis method, the weight relationship between displacement, fluid volume, and complexity index was calculated to be 0.59:0.41. Ultimately, a set of charts for comprehensive fluid fracture-creating capacity was established. Innovatively, the parameter of comprehensive fluid fracture-creating capacity is defined, providing a quantitative indicator for evaluating the ease and complexity of fracture formation, making fracture evaluation more scientific and objective and offering certain guidance for field operations.