Riserless completions

Abstract

A downhole barrier system comprising: a wellbore; an upper packer; upper barrier valve; a pressure sensor; a ported sub; a lower packer; a lower pack flow port sliding sleeve; and a lower barrier valve.

1 . A downhole barrier system comprising:
 a wellbore;   an upper packer;   upper barrier valve;   a pressure sensor;   a ported sub;   a lower packer;   a lower pack sliding sleeve; and   a lower barrier valve.   
     
     
         2 . The downhole barrier system of  claim 1 , wherein the lower packer is positioned within the wellbore below the upper packer. 
     
     
         3 . The downhole barrier system of  claim 1 , wherein the upper barrier valve is positioned within the wellbore above the lower packer. 
     
     
         4 . The downhole barrier system of  claim 1 , wherein the ported sub is positioned within the wellbore below the upper barrier valve and above the lower barrier valve. 
     
     
         5 . The downhole barrier system of  claim 1 , wherein the lower pack sliding sleeve is positioned within the wellbore below the lower packer. 
     
     
         6 . The downhole barrier system of  claim 1 , wherein the pressure sensor is positioned within the wellbore below the upper packer and above the lower packer. 
     
     
         7 . The downhole barrier system of  claim 1 , further comprising a lower completion. 
     
     
         8 . The downhole barrier system of  claim 1 , further comprising an upper completion and a production packer. 
     
     
         9 . The downhole barrier system of  claim 8 , wherein a lower most portion of the upper completion is positioned below the upper packer. 
     
     
         10 . An isolated wellbore system comprising:
 a well bore;   a downhole barrier positioned within the wellbore;   a suspension plug installed near the top of the wellbore at a well head; and   a subsea isolation device.   
     
     
         11 . The isolated wellbore system of  claim 10 , wherein the downhole barrier comprises an upper packer, an upper barrier valve, a pressure sensor, a ported sub, a lower packer, a lower pack sliding sleeve, and a lower barrier valve. 
     
     
         12 . The isolated wellbore system of  claim 11 , wherein the downhole barrier further comprises and upper completion and a production packer. 
     
     
         13 . The isolated wellbore system of  claim 10 , wherein the downhole barrier is positioned within the well bore. 
     
     
         14 . The isolated wellbore system of  claim 10 , wherein the suspension plug comprises an intelligent suspension plug. 
     
     
         15 . The isolated wellbore system of  claim 10 , wherein the suspension plug is configured to allow through bore access with a workstring. 
     
     
         16 . The isolated wellbore system of  claim 10 , wherein the subsea isolation device interfaces with a tubing head spool installed on the wellhead. 
     
     
         17 . The isolated wellbore system of  claim 1 , wherein the subsea isolation device is capable of interfacing with a drilling BOP system. 
     
     
         18 . A method comprising:
 providing a well system comprising a well bore, a casing, and a blowout preventer;   placing a barrier within the wellbore;   installing a suspension plug at a top of the well bore;   removing the blowout preventer;   installing an isolation device at the top of the wellbore;   removing the suspension plug;   installing an upper completion;   installing a tubing hanger plug;   recovering the subsea isolation device;   installing a Christmas tree;   recovering the suspension plug; and   installing the Christmas tree cap.   
     
     
         19 . The method of  claim 17 , wherein the barrier comprises an upper packer, an upper barrier valve, a pressure sensor, a ported sub, a lower packer, a lower pack sliding sleeve, and a lower barrier valve. 
     
     
         20 . The method of  claim 3 , further comprises installing a tubing hanger plug.