Technique and System for Intervening in a Wellbore Using Multiple Reels of Coiled Tubing

Abstract

A method that is usable with a well includes changing a connection between a first coiled tubing segment and a second coiled tubing segment while an upper end of the first coiled tubing section is out of the well and a portion of the first coiled tubing segment is deployed in the well. After the connection is changed, the method includes deploying the remainder of the first coiled tubing segment into the well or retrieving the portion of the first coiled tubing segment from the well.

1 . A method usable with a well, comprising: 
 changing a connection between a first coiled tubing segment and a second coiled tubing segment while an upper portion of the first coiled tubing segment is out of the well and the remainder of the first coiled tubing segment is deployed in the well; and    subsequently deploying the upper portion of the first coiled tubing segment into the well or retrieving the remainder of the first coiled tubing segment from the well.    
   
   
       2 . The method of  claim 1 , further comprising: 
 partially deploying the second coiled tubing segment into the well leaving an upper end of the second coiled tubing segment out of the well; and    subsequently connecting a bottom end of a third coiled tubing segment to the upper end of the second coiled tubing segment; and    deploying the remainder of the second coiled tubing segment into the well.    
   
   
       3 . The method of  claim 1 , further comprising: 
 wherein partially deploying the second coiled tubing segment into the well leaving an upper end of the second coiled tubing segment out of the well; and    subsequently connecting a bottom end of a tool to the upper end of the second coiled tubing segment;    connecting an upper end of the tool to a bottom end of a third coiled tubing segment; and    deploying the remainder of the second coiled tubing segment and tool into the well.    
   
   
       4 . The method of  claim 1 , wherein the first coiled tubing segment has a length less than approximately 5000 feet.  
   
   
       5 . The method of  claim 1 , wherein the second coiled tubing segment has a length less than approximately 5000 feet.  
   
   
       6 . The method of  claim 1 , further comprising: 
 engaging the upper end of the first coiled tubing with slips.    
   
   
       7 . The method of  claim 1 , further comprising: 
 disposing a check valve in a connector attached to the first coiled tubing segment or the second coiled tubing segment.    
   
   
       8 . The method of  claim 7 , wherein the act of disposing the check valve comprises disposing the check valve in a connector attached to the upper end of the first coiled tubing segment.  
   
   
       9 . The method of  claim 1 , wherein the first coiled tubing segment and the second coiled tubing segment have different wall thicknesses.  
   
   
       10 . A system usable with a well, comprising: 
 a first coiled tubing segment;    a second coiled tubing segment; and    slips to secure an upper end of the first coiled tubing segment when the first coiled tubing segment is partially deployed in the well to permit the second coiled tubing segment to be selectively connected to or disconnected from the first coiled tubing segment.    
   
   
       11 . The system of  claim 10 , further comprising: 
 an injector to deploy the first and second coiled tubing segments in the well or retrieve the first and second coiled tubing segments from the well.    
   
   
       12 . The system of  claim 10 , further comprising: 
 a third coiled tubing segment,    wherein the slips are adapted to engage the second coiled tubing segment to secure an upper end of the second coiled tubing segment such that a bottom end of the third coiled tubing segment may be connected to the upper end of the second coiled tubing segment.    
   
   
       13 . The system of  claim 10 , wherein the first coiled tubing segment has a length less than approximately 5000 feet.  
   
   
       14 . The system of  claim 13 , wherein the second coiled tubing segment has a length less than approximately 5000 feet.  
   
   
       15 . The system of  claim 10 , further comprising: 
 a check valve disposed in the first coiled tubing segment or the second coiled tubing segment.    
   
   
       16 . The system of  claim 10 , wherein the first coiled tubing segment has a different wall thickness than the second coiled tubing segment.  
   
   
       17 . A method of deploying coiled tubing in a wellbore, comprising: 
 providing a coiled tubing connector having a body with a longitudinal bore therethrough, the body having a first end section and a second end section sections, each end section having a tapered external surface, and a stiff section disposed between the first and the second end sections;    disposing the first end section within a first coiled tubing, the first coiled tubing having at least an end portion having a first wall thickness;    disposing the second end section within a second coiled tubing, the second coiled tubing having at least an end portion having a second wall thickness different than the first wall thickness;    securing the stiff section to the inner diameter of each of the first and second coiled tubings, thereby forming a connected tubing; and    lowering the connected tubing into a wellbore.