Patent ID: RE38866

Claim:
A pressure-boosting apparatus In combinaton in combination with a downhole tool and operated by a wireline-powered downhole pump, comprising: a pressure-actuated downhole tool operably connected to a wireline-powered downhole pump; said pressure-boosting apparatus In in flow communication with said downhole pump, and further comprises: a body having an inlet to receive a an inlet pressure source and an outlet connected to the downhole tool; a piston movably mounted In in said body, said piston having opposed faces of dissimilar cross-section; said piston comprises a towpath flowpath therethrough to allow, at least for a time, flow through said flowpath to the downhole tool to initiate Its its operation without piston movement, whereupon the creation of an unbalanced force on said piston due to said flow through said towpath flowpath , said piston Is is urged to move toward said downhole tool; said flowpath further comprises a check valve which allows flow toward said downhole tool until sufficient movement of said piston toward said downhole tool forces said check valve to close, which results in the pressure applied to said inlet being magnified at said outlet of said body and said downhole pump to thereby allow said pump, due to said pressure magnification, to produce sufficient pressure to fully operate said downhole tool ; and said check valve is closed without application of said inlet pressure .