Importance

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Abstract

There is disclosed a subsurface well completion system comprising body means having a bore therethrough adapted to be connected in axial alignment with a tubing string suspended within a well bore, and a packer carried by the body means for closing off the annulus above a production zone of the well. Flow through each of the bore of the body means and a passageway within the body means which bypasses the packer to connect the annulus above and below the packer is controlled by safety valves having pressure responsive operators for moving such valves from normally closed to open positions by means of control fluid which is supplied thereto through a control line from a remote source. Upon loss of control fluid, as, for example, due to loss of the control line, the valves automatically close. The pressure responsive operator for the tubing safety valve is carried within a tool which is landed within and retrieved from an upper pocket in the body means to one side of its bore, and the pressure responsive operator for the annulus safety valve, as well as a means for supplying control fluid to a means for releasing the packer to be set, are carried within additional tools which are landed within and retrieved from a lower pocket therein. The tubing safety valve is moved to open position and held in open position irrespective of control fluid by means of still another tool which is landed in the upper pocket, when the tool carrying pressure responsive means for operating the tubing safety valve is removed therefrom, so that the annulus safety valve tool may be substituted in the lower pocket for the packer releasing tool, after the packer is set, without risk of severing the wire line on which such tools are run.

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First Claim