Zone isolation system with integral annular flow control valve

Abstract

A zone isolation system comprising an isolation flow path arranged radially outwardly with respect to an internal bore of a production tubing. An isolation valve assembly is arranged in the isolation flow path. The isolation flow path is fluidly connected to a screen flow path defined by the annular space between a filtering assembly and a basepipe. The isolation flow path may traverse one or more zones and can extend to the wellhead, connecting to an isolation pump. The basepipe may further comprise an inflow control device such as a sliding sleeve.

1 . An isolation system for a subsurface borehole having multiple production zones, comprising:
 a tubular string having an internal bore, the tubular string comprising a basepipe;   an isolation flow path arranged radially outwardly of the internal bore; and   an isolation valve assembly arranged in the isolation flow path, the isolation valve assembly arranged to fluidly connect the isolation flow path to a screen flow path, the screen flow path comprising a volume arranged radially outwardly of the basepipe.   
     
     
         2 . The isolation system of  claim 1 , further comprising an inflow control device for fluidly connecting the isolation flow path to the internal bore. 
     
     
         3 . The isolation system of  claim 2 , the isolation valve assembly being operably coupled to the inflow control device. 
     
     
         4 . The isolation system of  claim 1 , the isolation flow path traversing at least one packing element. 
     
     
         5 . An isolation system for a well having multiple production zones, comprising:
 a filtering assembly arranged on a basepipe, an annular space between the filtering assembly and the basepipe defining a screen flow path;   a tubular having an isolation flow path formed therein, the tubular being coupled to the basepipe such that the isolation flow path is in fluid communication with the screen flow path; and   an isolation valve assembly arranged in the isolation flow path.   
     
     
         6 . The isolation system of  claim 5 , the isolation flow path comprising one or more axially extending channels. 
     
     
         7 . The isolation system of  claim 5 , further comprising a flow control device configured to control fluid communication between the production zone and an internal bore of the base pipe. 
     
     
         8 . The isolation system of  claim 5 , the isolation valve assembly being configured to selectively open and close by using a tool or hydraulic pressure. 
     
     
         9 . The isolation system of  claim 5 , the isolation valve assembly being operably coupled to the flow control device 
     
     
         10 . The isolation system of  claim 5 , the isolation flow path traversing at least one packing element. 
     
     
         11 . The isolation system of  claim 5 , the isolation flow path extending to a wellhead. 
     
     
         12 . The isolation system of  claim 5 , the isolation flow path connected to an isolation pump. 
     
     
         13 . An isolation system for a well having one or more production zones, comprising:
 a basepipe arranged in a tubing string adjacent to a production zone;   a filtering assembly arranged on the basepipe, defining at least one screen flow path between the filtering assembly and the base pipe;   a flow control device configured to permit fluid communication between the production zone and an internal bore of the base pipe;   at least one isolation flow path arranged in the tubing string and fluidly connected to the at least one screen flow path, the isolation flow path being isolated from an internal bore of the tubing string; and   an isolation valve assembly arranged in the isolation flow path.   
     
     
         14 . The isolation system of  claim 13 , the isolation valve assembly being configured to selectively open and close by using a tool or hydraulic pressure. 
     
     
         15 . The isolation system of  claim 13 , the isolation valve assembly being operably coupled to the flow control device 
     
     
         16 . The isolation system of  claim 13 , the isolation flow path traversing at least one packing element. 
     
     
         17 . The isolation system of  claim 13 , the isolation flow path extending to a wellhead. 
     
     
         18 . The isolation system of  claim 13 , the isolation flow path connected to an isolation pump. 
     
     
         19 . A isolation valve assembly, comprising:
 a first opening connected to a first flow path;   a second opening connected to a second flow path, the second flow path located radially inwardly relative to the first flow path;   a first piston comprising a first flanged section and a second flanged section, the first piston having a first position in which the first flanged section obstructs fluid communication between the first opening and the second opening and a second position in which the first flanged section does not obstruct fluid communication between the first opening and the second opening;   a second piston located between the first flanged section and the second flanged section of the first piston;   a biasing member located between the second piston and the second flanged section; and   one or more locking dogs, the locking dogs having a first position in which the one or more locking dogs restrict the movement of the first piston while not restricting the movement of the second piston, and a second position in which the one or more locking dogs restrict the movement of the second piston while not restricting the movement of the first piston.   
     
     
         20 . The isolation valve assembly of  claim 19 , further comprising a support ring, the second piston further comprising one or more collet fingers configured to engage the support ring. 
     
     
         21 . The isolation valve assembly of  claim 19 , the seal piston further comprising at least one seal; 
     
     
         22 . The isolation valve assembly of  claim 19 , the first opening connected to a screen flow path. 
     
     
         23 . An isolation system for a subsurface borehole having multiple production zones, comprising:
 a tubular string having an internal bore, the tubular string comprising a basepipe;   a screen flow path arranged radially outwardly of the basepipe;   an isolation flow path arranged radially outwardly of the tubular string; and   an isolation valve assembly arranged connected to the isolation flow path and the screen flow path, the isolation valve assembly having two or more positions, including a first position in which the isolation valve assembly is arranged to fluidly connect the screen flow path to the internal bore, and a second position in which the isolation valve assembly is arranged to fluidly connect the screen flow path to the isolation flow path.   
     
     
         24 . The isolation system of  claim 23  the isolation valve assembly having a third position in which the isolation valve assembly is arranged to fluidly connect the screen flow path to both the internal bore and the isolation flow path. 
     
     
         25 . The isolation system of  claim 23 , the isolation flow path traversing at least one packing element. 
     
     
         26 . The isolation system of  claim 23 , the isolation valve assembly comprising a first valve component, configured to selectively control fluid flow in an axial direction, and a second valve component, configured to selectively control fluid flow in a radial direction. 
     
     
         27 . An isolation system for a subsurface borehole having multiple production zones, comprising:
 an outer tubing string spanning two or more production zones, the outer tubing string comprising one or more circular flow valves in each of the two or more production zones;   an inner tubing string spanning one or more production zones, the inner tubing string having one or more flow ports located in at least one of the one or more production zones, the inner tubing and the outer tubing forming an annular space therebetween;   one or more sealing subs arranged in the annular space;   at least one shifting tool arranged on the inner tubing for arming the one or more circular flow valves, the armed circular flow valves being operable by hydraulic pressure.   
     
     
         28 . The system of  claim 27 , the one or more sealing subs comprising an second flow valve configured to selectively control fluid flow in an axial direction. 
     
     
         29 . The system of  claim 27 , at least one of the flow ports of the inner tubing comprising a flow control device for connecting an internal bore of the inner tubing with an annular space, the flow control device being hydraulically operated.