Method and system for surface enhancement of tubulars

Abstract

The invention discloses a method for surface enhancement of a pipe. The method includes the steps of: introducing the pipe in a wellbore; introducing cement slurry in the pipe from surface; introducing an expander cone in the pipe on top of the cement slurry, the expander cone having a largest outer diameter which is larger than the initial inner diameter of the pipe; pumping the expander cone towards the downhole end of the pipe, thereby moving the cement slurry to the downhole end and out of the downhole end and into an annulus enclosing the pipe, while and at the same time expanding the inner diameter of the pipe.

1 . A method for surface enhancement of a pipe, the method including the steps of:
 introducing the pipe in a wellbore;   introducing cement slurry in the pipe from surface;   introducing an expander cone in the pipe on top of the cement slurry, the expander cone having a largest outer diameter which is larger than the initial inner diameter of the pipe;   pumping the expander cone towards the downhole end of the pipe, thereby moving the cement slurry to the downhole end and out of the downhole end and into an annulus enclosing the pipe, while and at the same time expanding the inner diameter of the pipe.   
     
     
         2 . The method of  claim 1 , wherein a relative pressure loss across the total length of the pipe is reduced more than 25% after expanding the inner diameter of the Pipe. 
     
     
         3 . The method of  claim 1 , wherein the inner diameter of the pipe is expanded less than 10%. 
     
     
         4 . The method of  claim 1 , wherein the inner diameter of the pipe is expanded between 1% to 7%. 
     
     
         5 . The method of  claim 1 , wherein the inner diameter of the pipe is expanded between about 3% to 5%. 
     
     
         6 . The method of  claim 1 , including the step of:
 applying a hydrophobic or hydrophilic coating on the inner surface of the pipe, either before or during expansion.   
     
     
         7 . The method of  claim 1 , including the step of:
 applying an anti-corrosive coating to the inner surface of the pipe.   
     
     
         8 . The method of  claim 1 , including the step of:
 applying a ribbed pattern to the inner surface of the pipe.   
     
     
         9 . The method of  claim 8 , wherein the ribbed pattern is applied to the inner surface of the pipe by moving the expander cone, having a correspondingly ribbed outer surface, through the pipe. 
     
     
         10 . The method of  claim 8 , wherein the step of applying a ribbed pattern includes the step of:
 coating the inner surface of the pipe.   
     
     
         11 . Use of the method of  claim 1 , for surface enhancement of a pipe in a wellbore. 
     
     
         12 . System for surface enhancement of a pipe, the system comprising:
 a pipe string for introduction in a wellbore;   a cement slurry for cementing the pipe in the wellbore; and   an expander cone, having a largest outer diameter which is larger than the initial inner diameter of the pipe, for expanding the inner diameter of the pipe while pushing the cement slurry to a downhole end of the pipe.   
     
     
         13 . The system of  claim 12 , wherein the largest outer diameter of the expander is between about 1% to 7% larger than the initial inner diameter of the pipe. 
     
     
         14 . The system of  claim 12 , wherein the expander has a ribbed outer surface for applying a corresponding ribbed pattern to the inner surface of the pipe.