System and method for recompletion of old wells

Abstract

A system for recompletion of an old well in order to achieve an increased oil recovery from a reservoir, said system comprising a pipe inserted into the old well, at least two constrictors or swell packers being arranged along the length of the recompleted well and defining a well section between two successive constrictors or swell packers, said system further comprising at least one autonomous valve arranged in said well section defined between said two successive swell packers or constrictors. Disclosed is also a method for recompletion of an old well in order to achieve an increased oil recovery from a reservoir.

1 . A system for recompletion of an old well in order to achieve an increased oil recovery from a reservoir, said system comprising:
 a pipe inserted into the old well, at least two constrictors or swell packers being arranged along the length of the recompleted well and defining a well section between two successive constrictors or swell packers; and   at least one autonomous valve arranged in said well section defined between said two successive swell packers or constrictors.   
     
     
         2 . A system according to  claim 1 , wherein a plurality of well sections are defined along the length of the well and that at least one autonomous valve is arranged within each well section. 
     
     
         3 . The system according to  claim 1 , wherein the at least one autonomous valve operates by the Bernoully principle and has a substantially constant flow-through volume above a given differential pressure. 
     
     
         4 . The system according to  claim 1 , wherein the inserted pipe covers substantially the whole length of the old well. 
     
     
         5 . The system according to  claim 1 , wherein the well is a horizontal well. 
     
     
         6 . The system according to  claim 1 , wherein the well is a well of any inclination from horizontal, including vertical. 
     
     
         7 . A method for completion of an old well in order to achieve an increased oil recovery from a reservoir, comprising the following steps (not necessarily in said order):
 providing a pipe comprising at least one autonomous valve arranged in the pipe,   passing the pipe into the old well for recompleting said old well,   providing at least two swell packers or constrictors along the well to seal between the inserted pipe and the old well to define at least one well section between said two successive constrictors or swell packers in which at least one well section the at least one autonomous valve is arranged.   
     
     
         8 . A method according to  claim 7 , further comprising the step of providing a plurality of well sections along the well in each of which sections at least one autonomous valve is arranged. 
     
     
         9 . The method according to  claim 8 , further comprising the step of covering substantially the whole length of the old well with the inserted pipe. 
     
     
         10 . The method according to  claim 7 , wherein the at least one autonomous valve operates by the Bernoully principle and has a substantially constant flow-through volume above a given differential pressure. 
     
     
         11 . The system according to  claim 2 , wherein the at least one autonomous valve operates by the Bernoully principle and has a substantially constant flow-through volume above a given differential pressure. 
     
     
         12 . The system according to  claim 2 , wherein the inserted pipe covers substantially the whole length of the old well. 
     
     
         13 . The system according to  claim 3 , wherein the inserted pipe covers substantially the whole length of the old well. 
     
     
         14 . The system according to  claim 2 , wherein the well is a horizontal well. 
     
     
         15 . The system according to  claim 3 , wherein the well is a horizontal well. 
     
     
         16 . The system according to  claim 4 , wherein the well is a horizontal well. 
     
     
         17 . The system according to  claim 2 , wherein the well is a well of any inclination from horizontal, including vertical. 
     
     
         18 . The system according to  claim 3 , wherein the well is a well of any inclination from horizontal, including vertical. 
     
     
         19 . The system according to  claim 4 , wherein the well is a well of any inclination from horizontal, including vertical. 
     
     
         20 . The method according to  claim 8 , wherein the at least one autonomous valve operates by the Bernoully principle and has a substantially constant flow-through volume above a given differential pressure.