Casing structures having core members under radial compressive force
Patent
·
OSTI ID:6228370
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 differantial 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.
- Assignee:
- The Dow Chemical Company
- Patent Number(s):
- US 4515218
- OSTI ID:
- 6228370
- Resource Relation:
- Patent File Date: Filed date 27 Feb 1984; Other Information: PAT-APPL-584194
- Country of Publication:
- United States
- Language:
- English
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