Pressure responsive well tool with intermediate stage pressure position

摘要

A pressure responsive well tool (50) comprising: a housing having a flow conducting passage (56) therethrough; a pressure conducting channel in the housing; a spring assembly (120,124) in the housing for storing potential energy in response to an increase in fluid pressure within the pressure conducting channel and releasing the stored potential energy into the pressure conducting channel in response to a decrease in fluid pressure within the pressure conducting channel; and a staged latching assembly (200,204) operatively connected to the spring assembly (120,124) for providing an intermediate stage pressure position for the spring assembly (120,124). <IMAGE> <IMAGE> <IMAGE> <IMAGE>