Patent ID: 7575060
Filing Date: 2009-08-18
Classification: C21D,E21B

Abstract:
1. A method of increasing collapse resistance of a tubular, the method comprising: (a) identifying a desired collapse resistance of the tubular; (b) locating a tool having at least one bearing member within the tubular; (c) placing the bearing member in engagement with a wall of the tubular to apply a radial force to a discrete zone of the wall; (d) applying said radial force to additional discrete zones of the wall; and (e) selecting a level of the radial force to increase the collapse resistance of the tubular to the desired collapse resistance, wherein the selection of the level is independent of any constraining effects on the tubular and wherein applying said radial force induces compressive yield of an inner portion of the wall due to selecting the level of the radial force sufficient to cause the compressive yield.