Single Size Ball-Activated Fracturing System with Bridge Channel for Cased Well

The new unlimited multistage ball-activated fracturing system is researched which is composed of packers and ball seat ports. All ball-operated ports in one single trip can be opened by pumping single size balls. So, the inner diameter (ID) of the fracturing system is large and can support aggressive treatments with high-rate and high-sand-concentration slurries that optimize well simulations and maximize production. In this fracturing system, every ball-activated port is connected with every packer. The diameter of ball seats can be changed by hydraulic pressure. While the initial stage is treated, the tubing–casing annulus pressure is higher than the secondary stage. The high pressure is conducted to the secondary ball-activated port by the bridge channel and makes the diameter size of ball seat reduce. In the same way while one zone is treated, the diameter of ball seat for the next zone is changed. Using single size ball, it can open all ball-activated ports in one single trip. This new fracturing system can be applied for cased wells, both horizontal and vertical wells, using bridge channels to conduct pressure. Especially for refracturing wells, this new system can treat more stages and increase production.