Well tool comprising a frangible well barrier, and a method for providing such a well tool

Abstract

A well tool device includes a housing, a frangible disc and a seat for supporting the frangible disc in relation to the housing. The housing has an inner surface defining a through bore. The frangible disc is provided in the through bore and includes a side surface. The seat includes a side surface. A sealing device is provided between the frangible disc and the seat. The sealing device provided between the side surface of the frangible disc and the side surface of the seat is made from a vulcanized rubber material.

1 . A well tool device, comprising:
 a housing having an inner surface defining a through bore;   a frangible disc provided in the through bore, where the frangible disc comprises a first side surface;   a seat for supporting the frangible disc in relation to the housing, where the seat comprises a second side surface; and   a sealing device provided between the frangible disc and the seat,   wherein the sealing device provided between the first side surface of the frangible disc and the second side surface of the seat is made from a vulcanized rubber material.   
     
     
         2 . The well tool device according to  claim 1 , wherein the seat has been pre-treated before an assembly of the well tool device. 
     
     
         3 . The well tool device according to  claim 2 , wherein the seat has been pre-treated with a sand-blowing process and a priming process before the assembly of the well tool device. 
     
     
         4 . The well tool device according to  claim 1 , wherein the frangible disc ( 20 ) has been pre-treated before an assembly of the well tool device. 
     
     
         5 . The well tool device according to  claim 4 , wherein the frangible disc has been pre-treated with a priming process before the assembly of the well tool device. 
     
     
         6 . The well tool device according to  claim 1 , wherein a reinforcement fiber is incorporated into the vulcanized rubber material of the sealing device. 
     
     
         7 . The well tool device according to  claim 1 , wherein the housing comprises:
 a main housing section in which the seat is provided, where a section of the main housing section comprises an inwardly threaded area; and   an auxiliary housing section comprising a corresponding outwardly threaded area for connection to the inwardly threaded area of the main housing section.   
     
     
         8 . The well tool device according to  claim 1 , wherein the housing comprises:
 a first housing section, wherein a first seat section is provided in the inner surface of the first housing section;   a second housing section, wherein a second seat section is provided in the inner surface of the second housing section; and   a third housing section provided circumferentially outside the first and second housing sections,   wherein the sealing device is provided continuously in an annular compartment provided axially between the first and second housing sections and radially between the first side surface of the frangible disc and an inner surface of the third housing section.   
     
     
         9 . The well tool device according to  claim 7 , wherein each of the first and second housing sections comprises a piston surface facing away from the first and second seat sections, respectively. 
     
     
         10 . The well tool device according to  claim 1 , further comprising an adhesive between the sealing device and the frangible disc. 
     
     
         11 . A method for manufacturing a well tool device, comprising:
 a) providing a frangible disc;   b) aligning the frangible disc in relation to a seat provided in an inner surface of a housing;   c) providing a rubber material into a compartment provided between the seat and the frangible disc; and   d) vulcanizing the rubber material provided in the compartment, thereby forming a sealing element provided between the housing and the frangible disc.   
     
     
         12 . The method according to  claim 11 , where step b) comprises:
 c1) heating of the rubber material; and   c2) injecting the rubber material into the compartment.   
     
     
         13 . The method according to  claim 12 , wherein the step of injecting the rubber material into the compartment is performed until the rubber material is exiting through a channel provided in the housing radially outside of the seat. 
     
     
         14 . The method according to  claim 11 , further comprising the step of incorporating a reinforcement fiber into the rubber material before step d). 
     
     
         15 . The method according to  claim 11 , wherein the method comprises the following step before step b):
 treating the seat with a sand-blowing process and a priming process.