Trigger system for a downhole tool

A completion system comprising:

• a well string;
• a downhole tool operatively coupled to the well string;
• and
• a trigger system operatively coupled to the downhole tool, the trigger system comprising:
• a first housing forming a first pressure chamber at a first pressure, the first housing comprising a first membrane positioned in a wall of the first housing;
• a piston disposed at least partially within the first housing, the piston shiftable from an initial position to an actuated position to actuate the downhole tool;
• and
• a first trigger comprising:
• a second housing sealed against the first housing proximate the first membrane to form a second pressure chamber at a second pressure;
• and
• a first rupturing member positioned within the second housing and operable to pierce the first membrane to balance the pressures within the first housing and the second housing and shift the piston from the initial position to the actuated position.

A method of producing a well comprising:

• running a well string comprising a downhole tool and a trigger system into the well;
• rupturing a membrane separating a first housing of the trigger system at a first pressure and a second housing of the trigger system at a second pressure to balance the pressures in the first housing and the second housing to shift a piston of the trigger system from an initial position to an actuated position;
• and
• actuating the downhole tool via the shifted piston.