Variable OD coiled tubing strings

Abstract

Coiled tubing or a portion thereof having a first part spaced-apart from a second part, the coiled tubing having a first outer diamter at the first part and a second outer diameter at the second part, the first outer diameter different from the second outer diameter, and outer diameter of the coiled tubing continuously diminishing or increasing from the first part to the second part, in one particular aspect thus varying over its entire length; and methods for using and methods and apparatuses for making such coiled tubing.

What is claimed is:  
     
         1 . Coiled tubing comprising a first end spaced-apart from a second end, 
 the coiled tubing having a first outer diamter at the first end and a second outer diameter at the second end,    the first outer diameter larger than the second outer diameter, and    outer diameter of the coiled tubing continuously diminishing from the first end to the second end.    
     
     
         2 . The coiled tubing of  claim 1  wherein wall thickness of the coiled tubing varies.  
     
     
         3 . The coiled tubing of  claim 1  wherein wall thickness of the coiled tubing varies proportionally to the outer diameter.  
     
     
         4 . The coiled tubing of  claim 1  wherein wall thickness of the coiled tubing is constant.  
     
     
         5 . Coiled tubing comprising a first end spaced-apart from a second end and an intermediate portion between the first end and the second end, 
 the coiled tubing having a first outer diameter at the first end, a second outer diameter at the second end, and    a third outer diameter at the intermediate portion, and    outer diameter of the coiled tubing continuously varying from the first end to the intermediate portion.    
     
     
         6 . The coiled tubing of  claim 5  further comprising 
 outer diameter of the coiled tubing continuously varying from the intermediate portion to the second end.  
 
     
     
         7 . The coiled tubing of cliam  6  wherein the first outer diameter is greater than the third outer diameter.  
     
     
         8 . The coiled tubing of cliam  6  wherein the third outer diameter is greater than the second outer diameter.  
     
     
         9 . The coiled tubing of cliam  5  wherein outer diameter of the coiled tubing continuously varies from the intermediate portion to the second end.  
     
     
         10 . The coiled tubing of  claim 5  wherein wall thickness of the coiled tubing continuously varies.  
     
     
         11 . The coiled tubing of  claim 5  wherein wall thickness of the coiled tubing continuously varies proportionally to the outer diameter.  
     
     
         12 . The coiled tubing of  claim 5  wherein wall thickness of the coiled tubing is constant.  
     
     
         13 . A tubular string, the tubular string comprising 
 a first portion with a first diameter    a second portion with a second diameter,    the tubular string having a continuously varying diameter from the first portion to the second portion, the first diameter larger than the second diameter.    
     
     
         14 . The tubular string of  claim 13  wherein the the tubular string is comprised of coiled tubing.  
     
     
         15 . The tubular string of  claim 13  wherein the second portion comprises more than 50% of the string.  
     
     
         16 . Any patentable invention disclosed herein.