Life prediction model of fracturing sliding sleeve based on Sichuan shale gas in China

Abstract

Conventional sliding sleeve is an important tool for shale gas exploitation. However, there are some misoperation is easy to occur in the fracturing process of the conventional sliding sleeve. Therefore, a novel three-layer fracturing sliding sleeve is designed in the paper. It can realize the axial movement of the inner sliding sleeve between the inner wall and the outer wall, thereby avoiding multiple misoperations. And it is necessary to study the erosion and fracture law of the three-layer fracturing sliding sleeve. On the basis, the fluid analysis model of three-layer sleeve was established. Then the fluid analysis model was simulated to study the erosion law of the sand blast nozzle. Next, the theoretical working life of the sand blast nozzle was obtained by quantitative calculation. Finally, the theoretical working time was compared with the actual working time obtained experimentally. These experiments illustrated that the design of the safe distance of the sand blast nozzle satisfied the requirement. The difference between the experimental and the simulation results is 5.5% which proves that the simulation analysis is correct. The simulation analysis and quantum calculation can provide a theoretical basis for designing the three-layer fracturing sliding sleeve’s sealing reliability.