Systems And Methods For Multi-Stage Well Stimulation

A system for stimulating a subterranean formation, the system comprising:

• a wellbore formed within the subterranean formation;
• a tubular disposed within the wellbore;
• a first frac valve disposed within the tubular, the first frac valve having a first sleeve in a closed position, and further configured to move to an open position;
• a second frac valve disposed within the tubular downhole from the first frac valve, the second frac valve having a respective sleeve in a respective closed position, and further configured to move to a respective open position;
• a dart deployable into the tubular, and being configured to pass through the first frac valve without moving the first sleeve to the open position, and to subsequently engage the second frac valve, and to move the respective sleeve to the respective open position,
• wherein the dart comprises an adjustment mechanism being adjustable from a first position that allows the dart to pass through the first frac valve, to a second position that facilitates engagement of the dart with the second frac valve, the adjustment mechanism further comprising:
• a mandrel comprising an outer surface;
• an indexing sleeve moveably disposed on the outer surface, the indexing sleeve configured to control movement of the adjustment mechanism from the first position to the second position;
• an upper collet and a lower collet formed on the indexing sleeve;
• and
• a series of grooves formed on the outer surface, such that either of the upper and lower collet are engagable by respective grooves as the indexing sleeve increments axially relative the mandrel.