Apparatus for single-trip time progressive wellbore treatment

A time variable valve actuator comprising:

• a housing;
• a first chamber having a fluid inlet, a first piston located in the first chamber;
• a spring located in the first chamber and abutting the piston;
• an orifice piston;
• a shoulder in the first chamber limiting movement of the first piston;
• a second chamber filed with a fluid, the orifice piston positioned between the first and second chambers;
• a pressure release rod having recesses on its outer surface;
• a third chamber charged with a pressurized gas;
• and
• the pressure release rod being movable within the third chamber to provide an outlet passageway from the third chamber through the recesses on the pressure release rod.

A time delayed actuating device for a downhole component positioned within an oil or gas well comprising:

• a first tubular outer member;
• a second tubular inner member positioned within the first tubular outer member and forming an annular chamber between the first tubular outer member and the second tubular inner member;
• a timer assembly including a spring loaded piston, an orifice piston and a pressure release rod, located within the annular chamber;
• a chamber charged with a high pressure gas;
• and
• a movable sleeve positioned within the outer housing, said movable sleeve being axially moved by fluid pressure from the chamber charged with a high pressure gas in response to axially movement of the pressure release rod.