Production tubing for oil wells made of a composite material of continuous carbon fibre

Abstract

Production tubing for oil wells comprising a plurality of cylindrical elements made of a composite material consisting of continuous carbon fibres impregnated with a thermosetting epoxy resin, joined adjacently to each other by means of a male/female connection system, wherein the male connection is present on one end of the cylindrical element and the female connection is present on the other end of the cylindrical element.

1 . Production tubing for oil wells comprising a plurality of cylindrical elements made of a composite material consisting of continuous carbon fibres impregnated with a thermosetting epoxy resin, joined adjacently to each other by means of a male/female connection system, wherein the male connection is present on one end of the cylindrical element and the female connection is present on the other end of the cylindrical element. 
     
     
         2 . The tubing according to  claim 1 , wherein both the male and female connections are made of steel. 
     
     
         3 . The tubing according to  claim 1 , wherein both the male and female connections are made of the same composite material as the cylindrical elements. 
     
     
         4 . The tubing according to any of the previous claims, wherein a mineral filler in powder form, such as ceramic, mica, silica, zirconium, calcium carbonate, or glass and/or carbon microfibres, is added to the epoxy resin.