Collapse resistance of tubing
AssigneeWeatherford/Lamb, Inc.
InventorsDavid John Hillis, Paul David Metcalfe, Simon John Harrall
Life of this patent
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Abstract
A method of increasing the collapse resistance of a tubular comprises locating a tool having at least one, and typically three, bearing members within a tubular. The bearing members are positioned in engagement with a wall of the tubular to apply a radial force to a discrete zone of the wall. This radial force is then applied to further discrete zones of the wall, the level of radial force being selected such that the collapse resistance of the tubular is increased.
Claims53
A method of increasing the collapse resistance of a tubular, the method comprising:
- (a) locating a tool having at least one bearing member within a tubular;
- (b) placing the bearing member in engagement with a wall of the tubular to apply a radial force to a discrete zone of the wall;
- and
- (c) applying said radial force to further discrete zones of the wall, whereby the level of radial force is selected such that the collapse resistance of the tubular increases.
A method of increasing the collapse resistance of a tubular, the method comprising diametrically expanding the tubular within a larger diameter tubular.
A method of increasing the collapse resistance of a tubular, the method comprising applying radial forces to discrete areas of a tubular wall.
A method of increasing the collapse resistance of a tubular, the method comprising increasing at least one of the strength and hardness of at least the inner bore wall.
A metallic tubular having an inner bore wall of relatively high strength and hardness.
A method of increasing a collapse resitance of a tubular comprising:
- locating a tubular in wellbore, the tubular having an inner surface;
- and
- inducing a compressive stress in the inner suface thereby increasing the collapse resistance of the tubular.
Dependencies are inferred from the claim text.