Method for making centralizers for centralising a tight fitting casing in a borehole

Abstract

A centralizer for an oil well drill casing including at least one strip of ceramic or plastic material applied onto an outer wall of the casing.

1 . A centralizer for an oil well drill casing comprising: 
 at least one strip of ceramic or plastic material applied onto an outer wall of said casing.    
   
   
       2 . The centralizer according to  claim 1 , wherein the plastic material is a hardening resin.  
   
   
       3 . The centralizer according to  claim 2 , wherein the hardening resin is an epoxy resin.  
   
   
       4 . A centralizer for an oil well drill casing including at least one strip of ceramic or plastic material applied onto an outer wall of said casing made using a method comprising: 
 applying on a casing section an adherence strip equipped with one or more housings and rapid adjustable lever closure;    inserting at least one mold in at least one of the housings;    injecting into the at least one mold plastic material having a high mechanical resistance, a high degree of surface adhesion and resistance to abrasion by friction, and also elasticity in place, higher than the elasticity of the casings; and    removing the adherence strip once hardening of the plastic material in the shape of the at least one mold is complete.    
   
   
       5 . The centralizer according to  claim 4 , wherein the plastic material is a hardening resin.  
   
   
       6 . The centralizer according to  claim 5 , wherein the hardening resin is an epoxy resin.  
   
   
       7 . A system for centralization of an oil well drill casing comprising: 
 said casing; and    a centralizer applied onto an outer wall of said casing, said centralizer comprising at least one strip of ceramic or plastic material.    
   
   
       8 . The system according to  claim 7 , wherein the plastic material is a hardening resin.  
   
   
       9 . The system according to  claim 8 , wherein the hardening resin is an epoxy resin.