Cast flapper with hot isostatic pressing treatment

Details Cast flapper with hot isostatic pressing treatment Cast flapper with hot isostatic pressing treatment

E - Fixed Constructions

21

B

E21B 10/00 (2006.01) B22F 3/15 (2006.01) E21B 34/00 (2006.01)

Patent

CA 2571936

Components of a subsurface safety valve are cast instead of machined for dramatic cost savings. In particular, the flapper is cast from a 718 nickel alloy and treated with the HIP process to increase strength and corrosion resistance while reducing porosity. Other downhole valve components are contemplated to be produced by the same technique and the materials can also be varied. Depending on the specific alloys, the resulting HIP components are either superior in performance (e.g. strength, corrosion resistance) or considerably cheaper to manufacture than their wrought counterparts.

L'invention porte sur des composants d'une soupape de sécurité souterraine qui sont coulés au lieu d'être usinés, permettant de la sorte de réaliser d'importantes économies. Le clapet, en particulier, est coulé à partir d'un alliage de nickel 718 et soumis à un traitement de compression isostatique à chaud ("hot isostatic pressing" ou HIP) qui améliore la solidité et la résistance à la corrosion tout en réduisant la porosité. L'invention pourrait permettre de produire d'autres composants de soupape de fond de trou selon le même procédé, qui pourrait en outre s'appliquer à des matériaux variés. En fonction des alliages spécifiques, les composants HIP obtenus possèdent des performances supérieures (par exemple, la solidité ou la résistance à la corrosion) ou s'avèrent considérablement moins coûteux à fabriquer que leurs contreparties forgées.

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