Injection molded degradable casing perforation ball sealers

Details Injection molded degradable casing perforation ball sealers Injection molded degradable casing perforation ball sealers

C - Chemistry, Metallurgy

09

K

C09K 3/00 (2006.01) E21B 33/138 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2320949

A degradable ball sealer for use in the oil and gas industry is disclosed. The ball seal comprises a particular composition of matter and injection molding technique that provides a ball seal which will dissolve in stimulation or wellbore fluids after stimulation operations are complete. In use, the surface of the ball sealer softens slightly assuring a solid seal between the ball and the casing perforation. The composition when disolved into wellbore fluids does not pose a hazard and disperses well in aqueous based wellbore fluids. The same composition, made into a larger ball, may be used as a tubing sealer for pressure testing.

L'invention concerne une balle d'obturation dégradable, utilisée dans l'industrie gazière et pétrolière. La balle d'obturation contient une composition spéciale, la technique du moulage par injection permettant d'obtenir une balle d'obturation qui se dissout dans les fluides de stimulation ou de puits une fois les opérations de stimulation terminées. Pendant l'utilisation, la surface de la balle d'obturation se ramollit légèrement pour former un lien solide avec la perforation de tubage. Dissoute dans des liquides de puits, la composition ne comporte pas de dangers et se disperse bien dans des liquides de puits aqueux. La même composition, réalisée sous la forme d'une balle plus grande, peut être utilisée comme obturateur de tubage destiné aux tests de pression.

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