Production fluid control device for oil and gas wells comprising a housing connected to a tubing string

摘要

A device and method for selectively controlling the flow of production fluid through a tubing string (12) in an oil and gas well according to which a housing (24) is connected to a tubing string (12) for inserting into the well, and the well fluid is passed from the ground surface into the housing (24). The housing (24) is provided with a plug (56) to establish fluid pressure into the housing (24) to actuate a packer (16) and/or other ancillary devices. The plug (56) can be removed from the housing (24) by increasing the pressure of the well fluid in the housing (24) above a predetermined value, thus permitting the flow of production fluid from the formation zone, through the housing (24) and the tubing string (12), and to the ground surface.