Casing structures having core members under radial...

Details Casing structures having core members under radial... Casing structures having core members under radial...

E - Fixed Constructions

21

B

166/68

E21B 17/00 (2006.01) E21B 21/10 (2006.01) E21B 33/16 (2006.01)

Patent

CA 1223525

ABSTRACT OF THE DISCLOSURE Casing hardware, such as float collars and shoes, are used in oil well cementing operations. Some of the collars and shoes are constructed of a steel casing with a concrete core inside the casing. The casing structure of the collars and shoes now available places the core under a predominantly shearing force, so that it will fail at relatively low downhole dif- ferential pressures. The present invention provides a new design for the casing structure, which places the concrete core under a predominantly compressive force, and greatly increases the amount of pressure the core can withstand without failing.

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