Pressure Decline Analysis of Horizontal Well after Multiple Stage Fracturing

At present, the application of horizontal well multiple stage fracturing becomes more and more popular. However, the existing model of pressure decline analysis aims primarily at single fracture. There are great differences in the flow performance of fluids between multiple stage fractures and single fracture during the fracturing closure process. Therefore, we need to establish a diagnostic technique of horizontal well after multiple stage fracturing. Taking into account the pressure change with the situation about the horizontal well multiple stage fractures closure and single fracture closure, this paper analyzes forced and natural closure of horizontal well after multiple stage fracturing, and then establishes curve fitting method of related pressure decline model and fracturing parameters interpretation based on the pressure drop features while multiple stage fractures are closing simultaneously. This analytical method was confirmed by field application, and used to analyze the pressure decline of horizontal well after multiple stage fracturing, also is of great significance and reference value to the development of horizontal well fracturing theory.