Barrier valve hydraulic operator with compound valve opening force feature

An actuation assembly for a subterranean tool, comprising:

• a housing;
• an actuating member selectively extendable from said housing to operate the subterranean tool;
• an indexing assembly comprising a counter mechanism cyclically movable by a pressure cycle of pressure application and pressure removal in said housing, a bias opposing movement of said indexing assembly due to said pressure application;
• said indexing assembly movable for a predetermined number of said pressure cycles without operating the subterranean tool;
• a boost force device retaining a potential force during said predetermined number of said pressure cycles and delivering said potential force to said actuating member when said counter mechanism has had an incremental cycle beyond said predetermined number of said pressure cycles;
• said bias in said indexing assembly comprising an indexing spring, said indexing spring and said biasing member providing an initial tandem force to said actuating member during said incremental cycle;
• said actuating member reciprocates axially during said predetermined cycles.

An actuation assembly for a subterranean tool, comprising:

• a housing;
• an actuating member selectively extendable from said housing to operate the subterranean tool;
• an indexing assembly comprising a counter mechanism cyclically movable by a pressure cycle of pressure application and pressure removal in said housing, a bias opposing movement of said indexing assembly due to said pressure application;
• said indexing assembly movable for a predetermined number of said pressure cycles without operating the subterranean tool;
• a boost force device retaining a potential force during said predetermined number of said pressure cycles and delivering said potential force to said actuating member when said counter mechanism has had an incremental cycle beyond said predetermined number of said pressure cycles;
• said bias in said indexing assembly comprising an indexing spring, said indexing spring and said biasing member providing an initial tandem force to said actuating member during said incremental cycle;
• said indexing assembly further comprises an indexing sleeve having a pin to track a j-slot on said housing and a lock key extending in a housing groove to define opposed travel stops for said indexing sleeve;
• said indexing sleeve rotating while reciprocating and carrying with said indexing sleeve a ramp sleeve during said predetermined cycles;
• said indexing sleeve releasing said ramp sleeve during said incremental cycle to allow said ramp sleeve to push said lock key from said housing groove as said j-slot allows said indexing sleeve to travel a longer distance than during said predetermined cycles for actuation of the subterranean tool.