Wellbore Dart Actuation for Multi-Zone Fracturing

The patent applies universality by using a single-size dart with a unique selective profile that can engage with multiple different sliding sleeve profiles throughout the wellbore. Instead of requiring different sized baffles for different zones, the same dart design acts universally across all zones by selectively mating with each zone's specific sliding sleeve profile, thereby removing the limitation on the maximum number of zones that can be fractured.

The patent applies local quality by giving each sliding sleeve a unique profile characteristic that is localized to its specific zone. The dart's selective profile engages with these locally unique features, allowing the system to differentiate between zones without requiring graduated sizes of the actuation device itself. Each zone has its own specific engagement features rather than requiring a progression of sizes.

The patent applies parameter changes by utilizing the physical and chemical properties of degradable materials that change state under specific downhole conditions. The dart material is designed to degrade when exposed to certain temperature, pressure, or chemical environments, allowing it to break down into smaller particles that can be naturally produced without requiring additional intervention operations.

The patent applies self-service by designing the dart material to automatically degrade and dissolve after completing its actuation function. The material inherently possesses the ability to break down under downhole conditions, eliminating the need for external intervention such as drilling operations. The system serves itself by automatically removing the dart through material degradation rather than requiring separate removal operations.

The patent applies preliminary action by designing the dart material to remain stable and maintain its structural integrity during the actuation phase before degradation begins. The material is engineered to resist degradation under the specific temperature, pressure, and chemical conditions present during the stimulation operation, ensuring reliable performance of the actuation function before the degradation process is triggered.

The patent applies dynamics by designing the dart material with time-dependent properties that transition from stable to degradable. The material dynamically changes its behavior based on exposure time and environmental conditions, remaining stable during the initial actuation period and then progressively degrading after a predetermined time or upon exposure to specific triggers, allowing both reliability during operation and ease of removal afterward.