Design of Unconsolidated Sandstone Tip Screen-Out Fracturing Under the Actor of Proppant Complication

At present, the unconsolidated sandstone reservoirs with medium and high permeability have the problem that the longer the development cycle, the more serious the blockage, resulting in the reduction or shutdown of the well, and the conventional fracturing design cannot meet the needs of unconsolidated sandstone unplugging and increasing production to form “short and wide” fractures with high diversion capacity. This paper proposes using Tip Screen-out fracturing, and considering formation pollution and proppant compaction, to design a reasonable conduction capacity. The step of fitting the volume ratio of the pre-liquid to correct the half-length of the crack is added, and the accurate crack size is further calculated, and the key parameters such as the half-length of the crack and the crack conductivity can be calculated according to different fracturing processes, such as displacement, pre-liquid volume, sand volume, etc. The results show that the tip screen-out fracturing of unconsolidated sandstone will produce a “short and wide” fracture with high conductivity. The correction coefficient of proppant sand concentration was negatively correlated with the closing pressure, which influenced fracture conductivity. This study forms a complete set of calculation methods for tip screen-out fracturing of unconsolidated sandstone, which has guiding significance for the fracturing design of medium and high permeability unconsolidated sandstone oil and gas reservoirs.