Threaded device with metal to metal seal and method

Abstract

A device including a metal to metal seal. The device includes a first section having a first threaded portion. A second section having a second threaded portion threadably engageable with the first threaded portion. A metal bump seal protruding radially from the first section and spaced from the first threaded portion, wherein a radially directed seal is formed with the second section. Also included is a method for sealing a device.

1 . A device including a metal to metal seal, the device comprising:
 a first section having a first threaded portion;   a second section having a second threaded portion threadably engageable with the first threaded portion; and   a metal bump seal protruding radially from the first section and spaced from the first threaded portion, wherein a radially directed seal is formed with the second section.   
     
     
         2 . The device of  claim 1 , wherein the first and second threaded portions include one of straight or tapered threads. 
     
     
         3 . The device of  claim 1 , wherein the first and second sections are tubular. 
     
     
         4 . The device of  claim 3 , wherein the first section is one of a liner hanger, liner, casing, production string, work string, and drill string and the second section is another of a liner hanger, liner, casing, production string, work string, and drill string. 
     
     
         5 . The device of  claim 1 , wherein the metal bump seal is integrally formed with the first section. 
     
     
         6 . The device of  claim 1 , wherein the first section and the second section are made from metal. 
     
     
         7 . The device of  claim 1 , wherein the metal bump seal is a first metal bump seal adjacent a lead in area of the first threaded portion, and further comprising a second metal bump seal provided on one of the first section and the second section and adjacent a lead out area of the first threaded portion or second threaded portion. 
     
     
         8 . The device of  claim 7 , wherein an atmospheric pressure trap is created between the first and second metal bump seals. 
     
     
         9 . The device of  claim 1 , wherein the metal bump seal includes a cross-section forming an interference fit with a mating surface of the second section. 
     
     
         10 . The device of  claim 1 , wherein the second section includes a mating surface engaged with the metal bump seal and provided with a surface preparation including a coating. 
     
     
         11 . The device of  claim 1 , wherein the metal bump seal is adjacent a lead in area of the first threaded portion. 
     
     
         12 . The device of  claim 1 , wherein the metal bump seal is adjacent a lead out area of the first threaded portion. 
     
     
         13 . The device of  claim 1 , wherein the metal bump seal generates a first contact stress between the first and second sections. 
     
     
         14 . The device of  claim 13 , wherein, upon application of external pressure, a second contact stress higher than the first contact stress is generated between the first and second sections. 
     
     
         15 . The device of  claim 14 , wherein the device is run in a downhole environment to apply the external pressure. 
     
     
         16 . The device of  claim 15 , wherein the metal bump seal is a first metal bump seal adjacent a lead in area of the first threaded portion, and further comprising a second metal bump seal provided on one of the first section and the second section and adjacent a lead out area of the first threaded portion or second threaded portion. 
     
     
         17 . The device of  claim 16 , wherein, upon application of the external pressure, an atmospheric pressure trap is created between the first and second metal bump seals. 
     
     
         18 . A method of sealing a device including a first tubular section and a second tubular section, the method comprising:
 threadably connecting the first tubular section to the second tubular section with a threaded connection;   engaging a first metal bump seal adjacent a first end of the threaded connection between the first and second tubular sections to form a radially directed metal to metal seal at a first contact stress; and   applying pressure to create a second contact stress higher than the first contact stress with the metal bump seal.   
     
     
         19 . The method of  claim 18 , wherein applying pressure includes running the device into a wellbore. 
     
     
         20 . The method of  claim 19 , further comprising engaging a second metal bump seal adjacent a second end of the threaded connection and creating an atmospheric pressure trap between the first and second metal bump seals.