Well isolation control system and method

Abstract

An isolation and control system including a valve; a stroker operative to shift the valve between open and closed positions; and at least one control line operative to pressurize the stroker responsive to tubing pressure. Also included is a method for isolation and control in a borehole including running a plug having a pathway defined therein that leads to tubing pressure at one end and to the at least one control line at the other end to a system including a valve.

1 . An isolation and control system comprising:
 a valve;   a stroker operative to shift the valve between open and closed positions; and   at least one control line operative to pressurize the stroker responsive to tubing pressure.   
     
     
         2 . An isolation and control system as claimed in  claim 1  further including a plug interactive with a nipple to deliver tubing pressure to the at least one control line. 
     
     
         3 . An isolation and control system as claimed in  claim 1  wherein the valve is a sliding sleeve. 
     
     
         4 . An isolation and control system as claimed in  claim 1  wherein the stroker includes a hydraulic actuator and a shifting sleeve. 
     
     
         5 . An isolation and control system as claimed in  claim 1  wherein the at least one control line is two control lines, each of which are conditionable to respond to tubing pressure to stroke the stroker in one direction or the opposite direction. 
     
     
         6 . An isolation and control system as claimed in  claim 1  wherein the system further includes a plug having a pathway defined therein that leads to tubing pressure at one end and to the at least one control line at the other end. 
     
     
         7 . An isolation and control system as claimed in  claim 1  wherein the system includes two plugs and two control lines, each control line connected to the stroker to move the same in one direction or the other, the two plugs each defining at least one pathway between tubing pressure and one of the two control lines such that by selecting and running one of the two plugs will select one or the other of the two control lines to be connected with tubing pressure. 
     
     
         8 . An isolation and control system as claimed in  claim 1  wherein the system further includes a production/isolation sleeve that dead-heads the at least one control line and provides a production fluid flow path therethrough. 
     
     
         9 . A method for isolation and control in a borehole comprising:
 running a plug as claimed in  claim 6  to a system as claimed in  claim 1 ;   pressurizing a tubing string connected to the system as claimed in  claim 1 ;   shifting the stroker with the tubing pressure through the at least one control line; and   closing the valve.   
     
     
         10 . A method for isolating and control in a borehole as claimed in  claim 9  further including pulling a production/isolation sleeve prior to running the plug. 
     
     
         11 . A method for isolating and control as claimed in  claim 9  further comprising bleeding off well pressure and monitoring for pressure build-up to test the closed valve from below. 
     
     
         12 . A method for isolating and control in a borehole as claimed in  claim 9  further comprising pressuring up to test casing integrity. 
     
     
         13 . A method for isolating and control in a borehole as claimed in  claim 9  further comprising adding a sufficient amount of kill weight fluid to over-balance formation pressure. 
     
     
         14 . A method for isolating and control in a borehole as claimed in  claim 9  further comprising removal of a Christmas tree and installing a blow out preventer. 
     
     
         15 . A method for isolating and control in a borehole as claimed in  claim 9  further comprising replacing the plug with a production /isolation sleeve. 
     
     
         16 . A method for isolating and control in a borehole as claimed in  claim 9  further comprising removing kill weight fluid from the borehole by operating a subsurface pump prior to opening the valve. 
     
     
         17 . A method for isolating and control as claimed in  claim 14  further comprising removal of the blow-out-preventer and installing the Christmas tree while kill weight fluid remains in the well uphole of the closed valve. 
     
     
         18 . A method for isolating and control in a borehole as claimed in  claim 9  further comprising running the system with a production/isolation sleeve to depth;
 pulling the production/isolation sleeve and replacing with an opening plug responsive to tubing pressure to direct fluid through a control line associated with valve opening; and 
 pressuring up on a tubing string connected to the system and opening the valve. 
 
     
     
         19 . A method for isolating and control as claimed in  claim 10  further comprising bleeding off pressure and monitoring build up to test the valve, a packer or a bull plug associated with the valve from below. 
     
     
         20 . A method for isolating and control in a borehole as claimed in  claim 19  further comprising pressuring up to test casing integrity. 
     
     
         21 . A method for isolating and control in a borehole as claimed in  claim 20  further comprising adding a sufficient amount of kill weight fluid to over-balance formation pressure. 
     
     
         22 . A method for isolating and control in a borehole as claimed in  claim 21  further comprising disassembling a Christmas tree and installing a blow out preventer. 
     
     
         23 . A method for isolating and control in a borehole as claimed in  claim 22  further comprising replacing the plug with a production /isolation sleeve. 
     
     
         24 . A method for isolating and control as claimed in  claim 23  further comprising removal of the blow-out-preventer and installing the Christmas tree while kill-weight fluid remains in the well uphole of the closed valve. 
     
     
         25 . A method for isolating and control in a borehole as claimed in  claim 24  further comprising removing kill weight fluid from the borehole by operating a subsurface pump prior to opening the valve. 
     
     
         26 . A method for isolating and control in a borehole as claimed in  claim 24  further comprising running the system with a production/isolation sleeve to depth;
 pulling the production/isolation sleeve and replacing with an opening plug responsive to tubing pressure to direct fluid through a control line associated with valve opening; and 
 pressurizing a tubing string connected to the system and opening the valve.